CryoNet #33363 - #33394
CryoNet <[email protected]> 28 Feb 2011 13:16:18 -0000
| Newsgroups | gmane.culture.science.cryogenics |
|---|---|
| Message-ID | <[email protected]> |
CryoNet - Mon 28 Feb 2011
#33363: Mike Darwin's Alternate Reality [Melody Maxim]
#33364: comments re Darwin [Ettinger]
#33365: Re: CryoNet #33358 - #33362 [Gerald Monroe]
#33366: Secret societies? [Luke Parrish]
#33367: Melody Maxim's Distorted Reality 1 [M2darwin]
#33368: Melody Maxim's Distorted Reality 3 [M2darwin]
#33369: Melody Maxim's Distorted Reality 4 [M2darwin]
#33370: Melody Maxim's Distorted Reality 5 [M2darwin]
#33371: Melody Maxim's Distorted Reality 6 [M2darwin]
#33372: Melody Maxim's Distorted Reality 7 [M2darwin]
#33373: Melody Maxim's Distorted Reality 8 [M2darwin]
#33374: Melody Maxim's Distorted Reality 9 [M2darwin]
#33375: Melody Maxim's Distorted Reality 10 [M2darwin]
#33376: Melody Maxim's Distorted Reality 11 [M2darwin]
#33377: Melody Maxim's Distorted Reality 12 [M2darwin]
#33378: Melody Maxim's Distorted Reality 13 [M2darwin]
#33379: Melody Maxim's Distorted Reality 14 [M2darwin]
#33380: Melody Maxim's Distorted Reality 15 [M2darwin]
#33381: Melody Maxim's Distorted Reality 16 [M2darwin]
#33382: Melody Maxim's Distorted Reality 17 [M2darwin]
#33383: Melody Maxim's Distorted Reality 17 [M2darwin]
#33384: Melody Maxim's Distorted Reality 19 [M2darwin]
#33385: Melody Maxim's Distorted Reality 18 [M2darwin]
#33386: Melody Maxim's Distorted Reality 2 [M2darwin]
#33387: Melody Maxim's Distorted Reality 20 [M2darwin]
#33388: Melody Maxim's Distorted Reality 21 [M2darwin]
#33389: Melody Maxim's Distorted Reality 22 [M2darwin]
#33390: Melody Maxim's Distorted Reality 23 [M2darwin]
#33391: Melody Maxim's Distorted Reality 24 [M2darwin]
#33392: Melody Maxim's Distorted Reality 25 [M2darwin]
#33393: Melody Maxim's Distorted Reality 26 [M2darwin]
#33394: comments re Darwin [M2darwin]
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Message #33363
From: "Melody Maxim" <[email protected]>
References: <[email protected]>
Subject: Mike Darwin's Alternate Reality
Date: Sun, 27 Feb 2011 10:45:03 -0500
In Cryonet message #33358, Mike Darwin writes that I have made "bizarre and
ludicrous claims that cryonics has not interacted with perfusion science and
'Board Certified' perfusionists," and that those claims have "been shown to
be patently false." I have never made such statements, at all, hence it's
impossible for anyone to have proven them to be false. I did make repeated
objections to cryonics organizations sending laymen to perform perfusion on
their clients, because perfusion is not a task a layman is likely to
perform, without inflicting significant harm. Suspended Animation contracted
with qualified perfusionists AFTER I harshly, and repeatedly, criticized
them for allowing unqualified laymen to perform their perfusion procedures.
It's Mr. Darwin whose comments have, many times, proven to be "patently
false." For example, Mike Darwin clearly, and falsely, stated on the Cold
Filter forum, that he had once been a "board-eligible perfusionist." Mr.
Darwin has never even come close to meeting the requirements of being a
board-eligible perfusionist, and I called him on it, at which time he
stopped posting on Cold Filter and began criticizing the moderator of that
forum. It is Mike Darwin, who never acknowledges his mistakes, (or lies).
I'm sure he would love the moderator of this discussion group to satisfy his
request to ban me, because I'm probably the only participant who is likely
to recognize, and comment on, his many mistakes and deceptions.
Mr. Darwin also claims I have established a "secret forum," where I post my
"hateful rants and...use fraud and force against cryonics." This is just
another of Mr. Darwin's many delusions. My blog was available to the public,
until recently, and I'm sure most of what I wrote there has been archived,
or copied, on other public sites. Not long ago, (after the Max More
craziness), I grew tired of the tabloid-like sensationalism, and decided I
would convert the information on my blog into a more dispassionate plea, for
some sanity in the conduct of cryonics organizations, to be posted on a new
website. One would think Mr. Darwin would be happy my blog was closed, but
no, he wants to use the closing of it as an opportunity to pretend there is
some sort of secret cryonics-bashing conspiracy. I have not posted even one
word on the blog, since locking it. If Mr. Darwin, or anyone else, would
like to read my old material, all they have to do is ask. It is Mr. Darwin
who wants to operate under a veil of secrecy, not I. I simply want to carry
out the discussions in a more civilized manner, but it seems Mr. Darwin
would like to take the opposite course of action, with his name-calling and
false accusations.
In addition to falsely claiming to have been a "board-eligible
perfusionist," Mr. Darwin claims to have performed approximately 1,000 dog
perfusion experiments. Does anyone really believe that? If so, where is the
documentation of all those experiments? What valuable conclusions, if any,
came from those experiments? Does the reporting of any such results come
from credible sources? How many people outside the cryonics community have
been impressed with Mr. Darwin's scientific endeavors, over the past 35
years? Where did all those dogs come from? Where are the authorizations Mr.
Darwin would have needed, to legally perform all those experiments? Does Mr.
Darwin care if his outrageous behavior leads to the banning of cryonics? If
Mr. Darwin is such a cryonics superstar, why is it the cryonics
organizations, themselves, have so little to do with him? (Rhetorical
question...I believe many of us know the answer to that question.)
Mr. Darwin wants to maintain that no one has been deceived by the practice
of referring to laymen as medical professionals. Does he expect people,
newly interested in cryonics, to visit websites where they might see photos
of people dressed up in surgical garb, being referred to as "surgeons" and
"perfusionists," to know those people might really be gas station
attendants, or store clerks? Does he expect a layperson to read
SA's/Catherine Baldwin's ridiculous case report and know that one does not
find the femoral vessels in the femoral capsule, where Ms. Baldwin claimed
to be looking for those vessels? Does he expect a layperson to be able to
read between the lines of that report, filled with medical jargon that might
be impressive to laymen unfamiliar with medical terminology, and recognize
that Ms. Baldwin, (who referred to herself as a "surgeon"), didn't really
know what she was doing? Isn't it likely that many people who have signed up
for these very expensive procedures, some who have left substantial
insurance policies, trust funds and bequests to cryonics organizations,
might have been under the wrong impression, in regard to the quality of the
procedures they were signing up for? How can anyone fail to see the problem
with falsely referring to laymen with the titles of medical professionals,
while attempting to sell services with price tags of up to $200,000?
(Please, don't come back with the "it's all there in the small print"
defense, as the small print needs to be front-page news, in this situation.
Otherwise, it looks like a con-game.)
It's my position that cryonics organizations are misrepresenting the quality
of their services to an unsuspecting public, including members of their own
community, and I believe Mr. Darwin has played a large role in that
misrepresentation. It is also my position that cryonics "research" of the
last 40 years has been largely a waste of time and money, which has
accomplished little more than padding the pockets (and egos) of a small
handful of insiders, who have a vested interest in continuing on that
course. Mr. Darwin can try to discredit me until the end of time, with all
his name-calling and false information. The truth is, I'm a medical
professional who has spent many years working with some incredibly talented
and well-respected members of the medical community, and everyone who has
ever worked with me in conventional medicine will vouch for my credibility
and competency. Can Mr. Darwin say the same, or have his past cryonics
activities made him a pariah amongst even his own peers? Anyone who really
cares about cryonics activities should demand the cryonics organizations
live up to a much higher standard of professional ethics than they have in
the past, and the toxicity of "loose cannons" such as Mr. Darwin should be
of great concern.
Melody Maxim
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Message #33364
From: [email protected]
Date: Sun, 27 Feb 2011 11:05:54 -0500 (EST)
Subject: comments re Darwin
Here I'll just touch briefly on a couple of points raised by Mike Darwin's
recent post.
His analysis of the reasons for slow growth are largely unsupported and
unconvincing, and he leaves out a moderately prominent one--viz., the
embracing by many cryonicists of nonsense such as uploading. econlog.econlib has a
piece by one writer who was turned off cryonics by an advocate who embraced
uploading. I don't have all the relevant figures, but it is clear (1) that
many in cryonics do embrace uploading etc. and (2) that these fantasies
are easy bubbles to prick.
Then there is the assertion, more or less, that all publicity is bad
publicity and all media coverage should be avoided. Again, what is lacking is
supporting data. In particular, of those who have joined, what precipitated
their decisions? If it wasn't reading an article or a book or a web site,
what was it, and what was behind that?
Robert Ettinger
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Message #33365
References: <[email protected]>
From: Gerald Monroe <[email protected]>
Date: Sun, 27 Feb 2011 12:28:56 -0600
Subject: Re: CryoNet #33358 - #33362
--20cf307f389a9d4e3d049d47bdc8
Melody : A piece of paper doesn't guarantee that you are good at something.
Given that slightly over 200 cryonics cases have been performed in all of
human history, there *is no* formal training pathway to prepare someone to
save the minds of the recently deceased. I guess the closest match would be
training as a vascular surgeon, a perfusionist, or perhaps as a PhD in the
hard sciences.
All of those education paths take years to decades, and earn you a
professional license that you would be at risk of losing if you were to
participate in anything controversial. If you read the case report in
question, an M.D. WAS present during this case. Email me for the report.
It's funny you mention that regarding the blood clots : because Mike
actually mentioned that very issue. He specifically explained his
observations : an instrument to visually look at the outer surface of the
cortex. Those capillaries are the farthest from the arteries, so if they
don't visibly clot up, it's a good sign. Moreover, he isn't saying there's
no clotting at all : Mike is saying that since the patient was preserved
under better conditions, he doesn't see the clots that were visible in most
other cases. He is in no way claiming there is no damage at all : the hope
is that the better procedure caused less damage, leaving more information
preserved.
The reason I believe Mike is that he's honest about a great many things.
His reports don't gloss over things when a case goes bad, his technical
explanations are correct up to my level of education, and so on. I've never
seen him claim degrees he doesn't have, merely that he performed the surgery
or connected the bypass equipment, etc.
Have you TRIED to contact Mike and give him advice? Or contacted the folks
and Alcor and volunteered your services?
I actually agree with you in that there's a reason cryonics is small. *
Partly* the problem is a chicken-egg issue : today, cryonics is too small to
have access to or to *afford* teams of full time, fully formally trained
folks in the relevant field. The reason the teams have people without
formal training on them (and this is one factor leading to *mistakes*, as
Mike Darwin himself points out has happened a huge number of times) is
because those are the only people available for whatever the pay is (and the
need to be on call). Read about the early days of cryonics, and you will
realize that compared to those days, Mike is a legitimate expert in the
field.
I think that when the people with wealth look at cryonics, they don't see
the trapping of an institution they want to donate to : no marble corridors
and the like. Hospitals competing for the same donations *look* enormously
better, and they are crammed to the gills with extraordinarily well paid
employees with enormous amounts of formal education.
Yet a hospital will give you painful, futile treatments until you breathe
your last and leave you to rot under a sheet in the morgue. *Reality* is
different from appearance.
The only way cryonics can progress is that good people have to stand up for
it. Again, find out what it takes to join one of the cryonics teams. They
won't accept your advice as a stranger on the internet, but if you
demonstrated your abilities in person and did a few cases you might.
Your opinions are not unusual or even insightful : the fact that hospitals
that forcibly keep hopeless patients breathing as their brains rot
irreversibly away using hundreds of billions of dollars of national wealth
while cryonics has a paltry few million proves that. There's a reason that
nearly all of the hundreds of millions of Americans ignore cryonics even
though nearly everyone has been exposed to at least the concept somewhere.
Gerald Monroe
--20cf307f389a9d4e3d049d47bdc8
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Message #33366
Date: Sun, 27 Feb 2011 12:10:49 -0800 (PST)
From: Luke Parrish <[email protected]>
Subject: Secret societies?
> Recently, remarks have been made, in regard to Mr. Darwin wanting to
> make cryonics some sort of "secret society." Why might that be? Does
> he want cryonics organizations to live up to their reputation as
> being cult-like?
Oddly enough, Mike Darwin hasn't actually said he wants to make
cryonics some sort of secret society. He stated rather that certain
kinds of secret societies are "arguably" a better model for how
an endeavor like this could be achieved realistically than
laissez-faire consumerist capitalism.
He has also registered complaints to the effect that those in
charge of regulating medicine (and indeed most members of the
culture at large) simply do not have a solid grasp on the ethics
of the situation where cryonics is concerned. It is of course clear
to most that cryonics needs "regulation", i.e. professional rules
of conduct that customers can count on being adhered to. The debate
(if one can call it that) seems to be whether the rules should be
self-imposed in some fashion, or externally imposed by persons with
no interest in the success of the endeavor.
I like Mike's proposal of setting up cameras and videotaping
everything that goes on in cryonics -- a strategy which he labels
"Prosthetic Nocioception". I don't think these recordings should be
made publicly available as a matter of course, as there is known to
be a tendency among certain individuals to distort and misrepresent
everything they hear about cryonics for maximum shock value. The
purpose of videotaping everything, like that of producing highly
detailed case reports, would be for those who do have a legitimate
interest in building up the quality of cryonics care (who also
have relevant expertise from related fields) to be able to offer
constructive criticism, on a professional, not political level.
It would also be likely to deter carelessness in the first place
and provide better opportunities for self-evaluation on the part
of staff and organizers.
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Message #33367
From: [email protected]
Date: Mon, 28 Feb 2011 01:07:04 EST
Subject: Melody Maxim's Distorted Reality 1
Content-Language: en
No. No more answers from me until you answer the questions asked of you
first - and long ago. You are a pernicious distorter of truth by your
indecent use of dirty and degrading statements rephrased as questions.
Want just a few examples, folks? Well here's one fresh from CryoNet just
short while ago:
http://cryonet.org/cgi-bin/dsp.cgi?msg=33264
"While I'm sure Mr. Darwin has toyed with primitive perfusion equipment,
at cryonics facilities, he is not a perfusionist, or an engineer, and he
certainly does not have resources comparable to those of companies, which
specialize in perfusion equipment, such as those mentioned here:
http://www.perfusion.com/cgi-bin/links/default2.asp?tree=558"
Yeah, right, OK Maxim, PROVE it, prove that the equipment I worked with in
the 1980s and "90s was "primitive perfusion equipment, at cryonics
facilities"? In fact, were using the same equipment that was being used in
cardiothoracic operating suites around the world - and some of that equipment is
still, today, being used with excellent outcomes in places that can't
afford the latest and newest pumps... Nevertheless, removing the pejorative
words "toyed with" out of consideration, DFEND YOUR ASSERTION THAT I EMPLOYED
PRIMITIVE PERFUSION EQUIPMENT in cryonics. And be very careful to defend
your implication that that is ALL that I ever employed, because as we all
know, the only thing available to cryonicists when I became involved was "
primitive equipment" if you count embalming pumps. Indeed, even the Manrise
machine (which BTW, I never used myself) was reasonably sophisticated for
1972.
The you can go on to defend these remarks by citing REAL EXAMPLES and
PROVIDING REAL REFERENCES:
http://cryonet.org/cgi-bin/dsp.cgi?msg=33264
While I'm sure Mr. Darwin has toyed with primitive perfusion equipment, at
cryonics facilities, he is not a perfusionist, or an engineer, and he
certainly does not have resources comparable to those of companies, which
specialize in perfusion equipment, such as those mentioned here:
http://www.perfusion.com/cgi-bin/links/default2.asp?tree=558
"How many cryonics projects have been directed, on the advice of Mr.
Darwin and others like him? How many of those projects were based in ignorance
of existing equipment and technology? For so long as people like Mr.
Darwin and his peers are considered to be "experts," in cryonics experiments,
there is likely to be nothing more than ample misdirection and false
promises. It seems a very small group of self-interested people have made, what
could be an interesting scientific experiment, a total sham. (By
"self-interested," I do not mean people who are interested in extending their own lives;
I mean people who are primarily interested in maintaining their
over-inflated egos and/or bank accounts, by maintaining control of experiments
and/or projects, which they are not capable of leading.)"
Me and most others on CryoNet would like to know SPECIFICALLY not only "
*how many* of those (cryonics) projects were based in ignorance of existing
equipment and technology" as a result of my advice or actions, but EXACTLY
WHAT AND WHENTHEY WERE. Tell us!
And when you finish with the two simple and straightforward requests
above, THEN you can get started on the many questions and clarifications asked
of you in the material below and that is to follow. And I will post and
repost these questions relentlessly until:
1) You answer these questions succinctly and satisfactorily
2) You are removed from this forum
3) I am removed from this forum.
You are a damaging and destructive influence in cryonics, and there's the
pity, because you might well have made valuable contributions. It would be
hard to find anyone in or out of cryonics whose criticisms of the technical
and ethical shortcomings of the field more closely match my own, and those
of a very few others, some of who you know and with whom you might also
have worked. Instead you have chosen to attach, denigrate and humiliate. And
the irony is, of the people to whom you have directly caused distress, I am
not one. To use the only sentence that will do service to you and your
words: I could frankly give a fuck about your fucking lies and distortions
where they concern me. And anyone who knows me will know that is true. When
they first came to my to attention, as a result of an email from "Finance
Director (FD)," I responded factually and without ad hominem until I realized
that you were a seriously disturbed and vindictive person who was not
susceptible to reason, at which point I walked away and didn't give it another
thought.
I blew off subsequent emails from FD attempting to alert me to your
actions. Become any kind of a public figure and crazy idiots will say all kinds
of bad things about you - most of which are lies. Hell, even you own
associates and so-called "friends" will lie salaciously and foolishly about you.
The reasons for this execrable behavior as varied as they are impossible to
correct, or to control. You either get used to it, or you go mad. And
since I've long been the latter, that left me nowhere to go but on with my
life. It was not until I was forced to realize that your vile babble was
actually hurting cryonics that I was moved to action. Because when you started
harming cryonics you started fucking with two things I do care about - my
only reasonable hope of personal survival, and one of the few things I've
loved without reservation. Maybe it's better that way, because my response is
as mechanical, as relentless and as inevitable as the secondary fusion
reaction of a hydrogen bomb.
Mike Darwin
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Message #33368
From: [email protected]
Date: Mon, 28 Feb 2011 01:19:23 EST
Subject: Melody Maxim's Distorted Reality 3
Content-Language: en
Melody Maxim writes:
When the flow transducer would not work with CI's solutions, I attempted
to persuade Ben to allow me to find another way to measure the flow. There
are other ways, and I felt the safety of the centrifugal pump, (it makes it
virtually impossible to pump air to the patient), far out-weighed the
inconvenience of finding an alternative for measuring flow. I did not try very
hard to convince Ben, because I sensed he was uncomfortable with the pump,
and I felt certain there was no way for me to make him comfortable with it,
in the three short days I would be there. He seemed quite happy with the
occlusive (roller) pump I had helped him acquire, so I volunteered to
purchase the centrifugal pump back from CI. I told Ben I wanted to do some
experiments with the pump, and I did, but the main reason I wanted to buy the pump
back from CI was that I did not want them to be out $1,800 for a pump they
purchased on my advice, but would not be using. I even paid for them to
ship it to me.
Mike Darwin: This a good example of something learned over two decades ago
by professional cryonicists through experience. Had Ms. Maxim established
a dialogue with me this information would have undoubtedly been quickly
passed along. Flowm eters on earlier clinical centrifugal blood pumps do not
work on either asanguineous solutions or on low ion content solutions
(including washout solutions such as MHP and mRPS-2 used by CI) because they are
electromagnetic (EM) flow meters. EM flow meters work by measuring the
distortion in the magnetic field created as ion containing fluid moves through
that field. There are two sources of ions in blood: the dissolved salts of
metals such as sodium, potassium, magnesium, etc., and the iron present in
the oxygen carrying protein hemoglobin. It is possible to recalibrate EM
flow meters for asanguineous solutions that have ion levels reasonably close
to that of blood, but these flow meters do not perform accurately or at all
in some cases, if the ion concentration in the solution is much lower than
that of blood (or other body fluids).
TBW solutions are designed to inhibit the cell swelling that normally
occurs in ultraprofound hypothermia due to inactivation of the cellular ion
pumps that normally control cell volume (and ion content). This is done by the
expedient of replacing most of the ions that are permeable to the cell
membrane with other, larger molecules that cannot enter the cells. Typically,
what has been used as impermeant species to replace the ionized species
normally present in blood are sugars (glucose, lactobionate, raffinose), a
sugar-alcohol (mannitol) or (in the very early days of organ preservation) the
phosphate salts of sodium and potassium (e.g., Collins' Solution).
Even non-perfusionist cryonics personnel, such as Fred Chamberlain, wanted
to use centrifugal pumps, and indeed, as I previously pointed out here,
the first purpose-built cryonics perfusion equipment was executed using
centrifugal pumping technology. However, the problem of flow measurement had no
ready solution even though many things were tried. To name a few: in-line
paddle wheel flowmeters, differential pressure manometer flowmeters and
falling ball flowmeters. Sure, it was possible to get accurate flows with all
of these techniques, but only for perfusates of a fixed viscosity which
meant that both the composition and the temperature had to remain constant.
Clearly, this is a problem in cryoprotective perfusion where increasing
concentrations of increasingly viscous CPA(s) result in dynamically changing
perfusate viscosity. However, it was also a problem in recirculating CPB of
cryopatients prior to cryoprotective perfusion. This was so because the
character of the recirculated perfusate changed radically as its ion content
changed (equilibration with the large store of ions in the patients
tissues) and as its water content changed due to movement of water (usually edema
fluid) from the interstitial space of the patient into the vascular
compartment where comparatively hyperoncotic and hyperosmotic perfusate was
circulating.
Recent generations of centrifugal CPB equipment use ultrasonic Doppler
flow meters. These flow meters work using a phenomenon first discovered by
Christian Doppler in the 1840s. He noticed that a stationary observer
perceives a sound to have shorter and shorter wavelengths as its source approaches;
and longer wavelengths as the source recedes. The classic example of this
phenomenon (i.e., the Doppler Effect) explains why we hear a rising pitch
in the sounding horn of an approaching automobile and why, when the car
passes by us and recedes into the distance, the pitch drops. Ultrasonic Doppler
flow meters use this frequency shift to work with so-called dirty liquids,
fluids containing acoustical discontinuities such as suspended particles,
entrained gas bubbles or turbulence vortexes.
When ultrasound is beamed through a pipe or tubing containing flowing
liquid with particles, such a red blood cells i blood flowing through it, the
ultrasonic beam (or pulse) reflects off of the cells with an alteration in
frequency that is directly proportional to the flow rate of the liquid in
the tubing. The ultrasonic Doppler flow meter then calculates the flow rate
from the velocity of the red cells, rather than from the velocity of the
plasma or other (particle suspending) liquid.
Ultrasonic Doppler flow meters are ideally suited for many applications
where there is dirty, particulate rich water (such as sewage) or where there
are lots of particles or bubbles such as in slurries, crude oil, and, of
course, blood. Ultrasonic Doppler flow meters typically require suspended
solids or bubbles of at least 5 microns or larger in size to be present in a
concentration of ~100 parts per million or higher. Doppler-shift measurement
doesn't work in liquids with particulate concentrations exceeding ~45% w/v
or with high concentrations of very fine bubbles. Particles or bubbles in
these size ranges attenuate the reflected signal until it is
indistinguishable from tubing background noise.
>From these considerations its is pretty obvious why neither ultrasonic
Doppler flow meters or electromagnetic flow meters were usable in the
perfusion of cryopatients.
Why is knowing flow so important? Obviously, it is important to know
crudely what the flow through the patient is. It would be pretty frightening to
have no idea whatsoever of what the flow rate is during perfusion. But, how
much precision is necessary and for what reasons?
In clinical perfusion flow is one of a number of critical determinants of
both oxygen and substrate delivery to the tissues. Beyond these
physiologically critical point, flow, when considered in the context of arterial and
central venous pressures (i.e., the systemic vascular resistance or SVR)
provides a wealth of information about the condition of the patient with
respect to vascular tone, vascular compromise (from edema or capillaries blocked
to flow) and it provides a necessary context for meaningfully evaluating
critical physiologic parameters such as the measured gas exchange, pH and
blood ion content. In cryonics TBW knowing the flow is important for these
reasons and for others which are unique to cryonics.
Clinical CPB is not performed in patients who have suffered long agonal
periods with profound perimortem systemic ischemia such as that experienced
by cryopatients. The impact of such systemic ischemia can be profound and
may (and usually does) result either in conditions of very low flow at normal
physiological pressure (70 to 90 mm Hg) or conversely astronomically high
flows at well below such pressures. The former (we think) results from
cellular edema compressing capillaries, intravascular clotting (both macro and
micro) and perhaps from vasospasm. The latter (we think) results from
massive systemic vascular dilation; perhaps as a result of the production of
large amounts of nitric oxide (NO) or, in patients with ischemic times of ~30
min or more, due to substrate exhaustion in the smooth muscle that controls
vascular tone. Early attempts in the late 1960s to place cadavers on CPB
for organ retrieval failed due to shear injury from very high blood flow
rates at barely tolerable physiological pressures (i.e.,~40-60 LPM at 40 to 60
mm Hg!). I have seen both of these phenomenon in both experimental animals
(dogs) and in human cryopatients. So, for purely practical reasons, it is
important to know the flow during CPB in cryopatients.
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Message #33369
From: [email protected]
Date: Mon, 28 Feb 2011 01:23:09 EST
Subject: Melody Maxim's Distorted Reality 4
However, beyond these immediate practical considerations flow, in the
context of pressure and other variables of the case, provides critically
important insight into the pathophysiology of the cryopatient. We want to
understand what is causing these things, why they happen, and how they respond to
our interventions. Does SVR improve when we use a hyperoncotic perfusate, a
hyperosmotic perfusate or a combination of both during TBW? Is this
improvement lasting and does it come without adverse effects? Are
vasoconstrictors such Neosynephrine or vasopressin effective in cases where the SVR is
extremely low and the flow rate is astronomically high: and yet acceptable
(i.e., required) physiological perfusion pressure cannot be obtained? How much
actual capillary perfusion is occurring in such cases as opposed to flow
that is shunted around the capillary beds?
Beyond these examples it is important to understand that accurate
measurement of as many physiological parameters as is possible leads to
fundamentally new insights; often insights into important phenomenon which we did not
even know existed. If we dont collect the data we will not be able to learn
and make progress. The history of scientific, evidence-based medicine is a
testimony to the criticality of vigorously collecting data which is
consistently and ACCURATELY collected. That means precision in quantification. Ms.
Maxim seems not to grasp this.
Roller pumps are heavy, bulky and shed particles of tubing (spallation)
into the blood or perfusate they pump. They are also harder on blood (more
damaging to the cells) and they cause more activation of immune-inflammatory
cascade (IIC) than the latest generation of centrifugal pumps. Depending
upon the design of the system they unequivocally carry a greater risk of
macro air embolization. Everyones preference in cryonics was to use centrifugal
technology. However, a number of factors argued against this:
1) Knowing flows with precision and accuracy (indeed knowing them at all!)
was critically important. It is absolutely essential in cryoprotective
perfusion because flow rate is the primary perfusion parameter that determines
cryoprotective agent equilibration in the patient. Flow is also the primary
determinant of cooling rate (along with heat exchanger efficiency and the
temperature of the wall water) during in-field CPB of cryopatients. Knowing
when the patient will be cold enough to come off the pump is often really
important since it can mean catching or missing a commercial flight. Roller
pumps give a very consistent flow regardless of temperature, pressure,
viscosity or perfusate composition. RPM can be converted directly into flow.
2) It is possible to design TBW systems so that no macro air can be
perfused using roller pumps. This was done with the ATP. The ATP, properly set-up
(a given in any system including centrifugal circuits) cannot pump macro
air. The ATP was NOT designed for extended closed-circuit operation and ALL
of my advice to SA was in the (stated) context of simple open circuit flush
of the patient.
3) The notion that centrifugal pumps cannot cause physiologically
devastating over-pressure injury is incorrect. While centrifugals cannot generate
an infinite head of pressure under occluded conditions as can roller pumps,
the static pressure of most medical centrifugals under no-flow (occluded
arterial or venous line) conditions varies from ~500 to well over 700 mm Hg.
Such pressures will NOT rupture the extracorporeal circuit (i.e., explode
oxygenators, filters, or blow apart circuit connections) but they can cause
tremendous damage to patients. Just try occluding the venous (outflow) line
on a CPB circuit employing a centrifugal pump on a human (or animal) and
wait until the flow goes to zero from back pressure. You will have one very,
very dead patient. The much touted safety against over-pressure with
centrifugals in CPB is primarily to the circuit and thus indirectly to the
patient because if the arterial leg of the circuit explodes due to a clamped
line, bypass is interrupted until a new circuit can be brought on-line and the
patient is now virtually guaranteed not only ischemic time, but very
likely the need for transfusion as well (with all its attendant risks).
4) No cryonics patient, to my knowledge, has ever been air embolized
during in-field TBW due to a roller pump or due to pumping the venous reservoir
dry. When in-field air embolization has occurred it has been due to
improper connections on the arterial line: between the arterial line and the
cannula (Venturi effect) or due to failure to de-bubble and aspirate the
arterial line and arterial cannula/vessel prior to going on bypass.
5) Low level and bubble detection equipment with auto-shut-off and
line-clamp features are highly effective at prevent air embolization and should be
used on ALL CPB circuits.
6) Loss of prime on centrifugal pumps in the presence of high molecular
weight colloids creates large numbers of very stable and difficult to remove
micro-bubbles. This also often happens during priming when air is
enrtrained into the pump.
7) Centrifugal pumps are not acceptable for CPA perfusion and personnel
MUST learn how to reliably and safely use roller or other occlusive positive
displacement pumps. This can only be achieved by extensive didactic and
hands-on training in a feedback driven model. Translated, that means you must
pump living animals under demanding conditions (i.e., that produce major
physiological derangements) with SURVIVAL as the outcome and with EVALUATION
of the quality of that survival (i.e., end organ function, neurological
outcome, etc.).
I (and Jerry Leaf when he was alive) have been saying this for 20
years!!!!!!
Melody Maxim writes:
"The misunderstandings that are going on, here, are one of the inherent
reasons medical professionals should be used to perform medical procedures in
cryonics. We never had these types of disagreements, when I worked in
heart surgery, because we all had the same basic educations, with our
specialties layered on top that. In other words, we "spoke the same basic language,"
and we had all been educated regarding each other's specialties, to some
degree. (All of the perfusionists in my class did hospital rotations
assisting the anesthesiologist, and scrubbing in with the surgeons, and we had
classes related to every aspect of heart surgery, not just perfusion.)
Mike Darwin: This is quite true and, in point of fact, neither Jerry nor I
had any such problems with the many medical professionals, including
professional perfusionists, with whom we interacted or collaborated with over
the years. In fact, Ms. Maxim is the first such person with whom Ive had this
difficulty."
Melody Maxim writes:
"These questions are not pertinent to the situation at SA. SA is not
starting out with blood, and they are not using cryoprotective perfusate of
varying concentration. The last I heard, they are washing out the patient's
blood with a specified volume of washout solution that has a consistent
concentration."
Mike Darwin: See my extensive comments above.
Melody Maxim writes:
"Precisely measuring the flow is nowhere near as important as preventing
the introduction of air to the patient. An occlusive pump will continue to
pump at the set rate, regardless of whether the tubing is filled with fluid,
or air, while a centrifugal pump will not."
Mike Darwin: This is true, but it is not the whole story (see above). The
solution is to have *only properly trained/skilled personnel perform TBW*.
Clinical perfusionists are the ideal (with additional training) but the fact
is that any intelligent, motivated person with the right temperament and
reflexes can be trained to operate an open circuit TBW system (with the
proper safeguards) with a high degree of safety. That does not mean a weekend
of training but rather extensive, outcome-based training using the identical
system that is to be employed in the field. The reality is that in much of
the world, and for the foreseeable future, cryonics is going to be
performed by non-perfusionists. There was a time when that was done both safely
and effectively (if you count me as a non-perfusionist). But it was NOT done
easily.
In fact, actual real-world experience has demonstrated that I am even more
conservative on this point than is Ms. Maxim. I refused to provide CI with
a more complex circuit absent extensive training to a level where I was
satisfied that the personnel using the system would be reasonably safe. Every
additional complexity in the procedure or the circuit design creates
distractions with the potential for error (absent through training and vetting).
There was a time in cryonics (1981 to 1997) when at least in SOME cryonics
operations these standards applied and in those operations *air was never
pumped to any cryonics patient (with no exceptions and no qualifications)*.
Meklody Maxim writes;
"An equally critical, related issue, (which isn't even being discussed by
Mike), is the importance of maintaining proper patient pressures. After
reading SA's "CI-81" case report, I accused SA of over-pressurizing a patient
whose cerebral vasculature was already compromised. The occlusive pumps
that have been used in cryonics are NOT sensitive to pressure and will
continue to deliver the selected flow rate, no matter how high the patient's
pressure gets. (In other words, an occlusive pump will continue to pump at the
same rate, in the presence of increasing pressure, until something blows
apart.) A centrifugal pump will respond to increasing patient pressure with a
decreasing flow rate, and to a decreasing patient pressure with an
increasing flow rate, at a constant RPM.
Placing an amateur behind an occlusive pump is almost certain to result
in:
a.) Air being introduced to the patient
b.) Inappropriately high perfusion pressures that may result in vascular
insult to the patient
c.) Inappropriately low perfusion pressures that may result in the
inadequate perfusion of the patient's tissues (some of the patient's tissues won't
be perfused with the cryonics solutions)
d.) Any combination, or all, of the above"
Mike Darwin: Countless CPB cases have been pumped worldwide with roller
pumps with a microscopic incidence of air embolism due to the presence of the
roller pump, per se; and with excellent outcomes. This was true even
before the introduction of safety features such as macro/microbubble detectors,
low-level detectors and arterial line clamps. Of necessity, neonatal and
adult ECMO are STILL carried out using compliant bags with these features
(plug a push-plate type bag volume sensor/controller) and I believe many
canters still use roller pump for this days to weeks-long CPB procedure. The
fact is that BOTH systems are used clinically with acceptable safety and
excellent outcomes.
Outside of cryonics, in the world of clinical medicine, I have almost no
doubt that centrifugal pumps will become the standard of care and, what is
more, that minimal CPB using integrated centrifugal pump-oxygenator- heat
exchanger-cardiotomy and venous reservoir systems is the future of CPB (and
that eventually, when/if true membrane hollow fibre oxygenators are
manufactured, this will be the case for extended duration ECMO, as well). These
systems are compact, have less immune-inflammatory cascade activating surface
area (and the surface area that is present can be better treated to
minimize such activation), and are less damaging to both the formed elements of
the blood and to the plasma proteins than are conventional CPB circuits
andthey require less priming volume thus conserving blood and reducing the need
for transfusion. They are also just more elegant and aesthetically
physiological: in the body the heart is not positioned in the pelvis, but rather is
adjacent to the lungs with the shortest possible lengths of connecting
tubing (blood vessels).
Whats more, if the flow problem can be solved I believe that minimal CPB
systems will be ideal for use in cryonics cases including cases where
prolonged (8 to 24 hours) extracorporeal support is indicated. Of course, this
presupposes they are affordable. Much of what we actually used in cryonics
from day one was a function of what we could gain access to - and that was in
large part a function of money. (The righ 'connections' and favors also
played a critical role). SA is an other-worldly affair subsidized by LEF and
not, as far as I can tell, sustainable in its current form.
Ms. Maxim speaks of inappropriately high perfusion pressures in
cryopatients. I concur, but would go further and ask these questions of her:
1) What are the safe and appropriate pressures to use in cryopatients
during both blood washout and subsequent asanguineous recirculation? Please
explain why you have chosen the value(s) you provide.
2) What are the absolute and relative medical contraindications to in-field
TBW for cryopatients?
3) What are medical indications and contraindications for extended (> 1
hour) asanguineous extracorporeal support of cryopatients? What are the
likely complications and how should they be managed?
4) What are the expected pressures (MAP & CVP) and flows in both acute TBW
and ECMO treated cryopatients?
5) What colloids can be used in TBW/ECMO of cryopatients and for what
reasons? What colloids are known to be contraindicated and on the basis of what
evidence?
6) What FiO2 should be used during TBW and/or ECMO in cryopatients? Why?
Melody Maxim writes:
"Mike Darwin: "So, again, I ask: has SA done the simple experiments
necessary to validate the SCPC flowmeter? An easy place to start is to pump tap
water from a reservoir and measure the flow/min by capturing the pump output
in a graduated cylinder while using a stopwatch to determine elapsed
time."
I've been waiting all day for someone to ask the obvious question, but it
seems to have slid right past everyone on this forum. Since Mike claims to
be concerned with the accurately measuring the flow of SOLUTIONS USED IN
CRYONICS, why is he suggesting using TAP WATER for the experiment, rather
than the actual washout solution??? This makes no sense, whatsoever.
Regardless, as Mike, himself, points out, it is simple to determine whether the flow
transducer is accurate for SA's washout solutions, and I'm quite sure the
perfusionists associated with SA learned this simple task, (just as I did),
in perfusion school.
Mike Darwin: I suggested tap water because it is cheap and readily
available. If the flowmeter reads tap water flows accurately then it is worth
proceeding to test it with perfusate (really expensive) under real-world
conditions. I suggested tap water for the same reason you used it in training
circuits: it is a cheap liquid which you can pump and which behaves enough
like blood for the purpose at hand. If the SCPC flowmeter gives an invalid
number for tap water, particularly if it is misleadingly close to a believable
flow, then you should proceed with real caution if you proceed at all. CPB
ultrasonic Doppler flow meters and electromagnetic flowmeters will NOT
read water or TBW asanguineous perfusates at all. This is a blessing in that
you are not likely to mistake a random number generator for a truly accurate
flowmeter. If a flowmeter reads tap water with reasonable accuracy (or can
be calibrated to read such) then there is a good chance it will read
perfusate accurately; after all, we know for sure it reads blood accurately and
tap water is one extreme of a continuum between distilled water and blood,
with perfusate being in-between in terms of viscosity and ion content.
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Message #33370
From: [email protected]
Date: Mon, 28 Feb 2011 01:28:13 EST
Subject: Melody Maxim's Distorted Reality 5
Content-Language: en
Melody Maxim writes:
Mike Darwin: "Your remarks about unreliable and malfunctioning in-house
fabricated circuits certainly don't apply to my experience of nearly 25
years. I have never had a circuit fail - never. I have had an oxygenator fail,
but that is really the only mechanical failure I've ever had on CPB. One
qualification is that the Sarns venous reservoir bags did not have a rigid,
internal fenestrated intake line. This meant that under high flow conditions
the bottom of the bag around the orifice feeding the pump would sometimes
collapse and cut off flow. This problem was remedied by switching to the
Gish/Terumo bags."
One of the key figures in the perfusion group SA is said to be working
with is a prominent figure in the perfusion community. He's the co-author of a
book that can be found in the lab coat pockets of a large percentage of
clinical perfusionists, and is required reading material for many perfusion
students. At the risk of being rude, I doubt his perfusionists need Mike's
advice, regarding which reservoir bags to use. I believe Mike's persistence
in naming as many specific perfusion devices he can, and remarking on
things like "internal fenestrated intake lines" to be a major distraction from
the REAL issues the amateurs working in cryonics, or the people reading this
forum, need to be concerned with, (like the basics of maintaining proper
perfusion pressures and preventing air embolization). Given that SA starts
with a known volume of solution, it should be easy to determine, (even
during a case), if the flow rate is approximately accurate. For the washout
procedure, would it really matter if the flow were actually 3.2LPM, when the
flow meter was reading 2.9LPM? For as long as you have good patient pressures
and no air is getting pumped to the patient, the proper answer to that
question would be a definitive, "No.""
Mike Darwin: These remarks are not so much rude as ignorant. I'm glad SA
has such a fine perfusionist. But, no matter how good this man is, he will
almost certainly not have expertise unique to and essential to proper
extracorporeal management of cryopatients. How could he? No patient presenting
for clinical CPB even approximates the average cryopatient presenting for TBW
and/or asanguineous ECMO. Even within perfusion there are areas of
specialization that require additional knowledge and training: extended ECMO,
emergency fem-fem CPB, neonatal and pediatric CPB, and normothermic CPB, to
name a few. What is so extraordinary about the idea that cryonics should be
the same? As just one small example, Ms Maxim had no idea how or why
conventional CPB flow meters worked, or that they would not work in cryonics. That
comparatively trivial lack of knowledge resulted in the following (quoting
Ms. Maxim):
When the flow transducer would not work with CI's solutions, I attempted
to persuade Ben to allow me to find another way to measure the flow. There
are other ways, and I felt the safety of the centrifugal pump, (it makes it
virtually impossible to pump air to the patient), far out-weighed the
inconvenience of finding an alternative for measuring flow. I did not try very
hard to convince Ben, because I sensed he was uncomfortable with the pump,
and I felt certain there was no way for me to make him comfortable with it,
in the three short days I would be there. He seemed quite happy with the
occlusive (roller) pump I had helped him acquire, so I volunteered to
purchase the centrifugal pump back from CI. I told Ben I wanted to do some
experiments with the pump, and I did, but the main reason I wanted to buy the pump
back from CI was that I did not want them to be out $1,800 for a pump they
purchased on my advice, but would not be using. I even paid for them to
ship it to me.
To summarize, the costs of this lack of existing knowledge were at least
as follows:
1) Time and effort lost acquiring a pump that was not useable.
2) Any time and effort lost trying out others methods of determining flow
that have already been explored and found unworkable.
3) Money expended needlessly on the system and on shipping it to and fro.
4) Loss of credibility that results when others learn that these problems
had already been extensively explored in cryonics and that that information
was readily available, some of it on the Internet.
5) Knowledge of new, scientific/industrial ultrasonic flow meters that may
well work for cryonics applications (but which have not yet been tested).
Melody Maxim writes:
Mike Darwin: "One last point I'd like to make is that it is important to
consider the context of the times. SA has, by any standards in cryonics,
vast amounts of capital and human resources. Most of the history of cryonics
has been one of negligible capitalization and in most of the world this is
still the case. The SCPC system is lovely, but the question is, is it
affordable for most cryonics operations not heavily financially subsidized?"
Now, THAT'S a damn good question. However, it's long been my opinion that,
if we are able to improve the quality of patient care in cryonics, the
science will gain a wider acceptance, and more money will come in. (Sort of an
"If you build it, they will come," kind of thing.) SA has the funding to
provide quality equipment and qualified personnel to operate it. Would Mike
have them remain in the dark ages and rely on self-taught amateurs with
makeshift equipment, just in case the funds dry up? I think I have a better
suggestion: SA could save hundreds of thousands of dollars each year, by
cutting their staff to two full-time people managing a well-manned,
well-maintained standby team of professionals. The professionals would determine what
equipment will be used, and if anything needed to be built, it could be
contracted out to reputable engineers who would deliver the projects within a
specified time- and price- range. The professionals would be able to write
their own case reports, so SA wouldn't have to pay a science fiction writer
to make them look like fools."
Mike Darwin: I'm in agreement with most of these sentiments, but not the
idea that if you build it they will come in the sense that cryonics will
instantly or even soon be transformed into a medical-professional undertaking.
Here's the irony: Ms Maxim and many others took cryonics seriously enough
to get involved because it APPEARED that biomedically sound perfusion
technology was actually being used by some extant cryonics organizations. That
that appearance was even possible was almost solely a result of a time in
cryonics when such sound, medically-based perfusion practices were in fact
being used. When Jerry Leaf and I were no longer present the patina of
biomedical credibility was sustained, but NOT the reality.
That reality, when it existed, used both professional medical personnel
and in-house trained personnel. These people were trained to do perfusion
procedures of sharply limited complexity to very high standards with safety as
the core goal. No, they could not pump a clinical CPB case, just as a
paramedic cannot manage a patient in septic shock in the ICU. However a
paramedic CAN successfully manage a patient in septic shock long enough to get him
to the hospital ED. Paramedics are not made in a weekend and neither were
the (very few) in-field CPB techs we trained. In fact, NONE OF THEM WERE
EVER USED; either Jerry or I did or supervised every TBW done during our
tenure at either Alcor or BPI. The primary (and successful) use of the in-house
perfusionists we trained was to mind the pump during dog research. This
was a demanding and essential job which we could not afford to pay
professional perfusionist to do on a long term basis.
In a broader sense it IS true that if you build it they will come.' That
sense is that IF you have a medically sound practice of cryonics which is
rational and evidence based, then a few medical professionals will be
attracted to cryonics and will not run away in disgust at what they find. A few of
these people will stick around and get involved. Cryonics was lucky that
two such people stayed around and worked to improve things DESPITE the
horrible state it was in. The Chamberlains, Art Quaife, Jerry Leaf, myself and
others are examples of this at different times in different places and in
different ways.
Melody Maxim writes:
Mike Darwin: However, no amount of technology will protect you from
incompetence and lack of skill.
I couldnt have said it better, myself!"
Mike Darwin: This has been my point since at least 1978. Even very crude
equipment can be using with surprising safety and effectiveness if you have
competent and experienced personnel. Ive seen CPB done safely in the Third
World using procedures and equipment that would shock any Western
perfusionist including using the same circuit for 3 different patients (all with the
same blood type and cross-match compatibility) with no safety equipment
and nothing to monitor CPB but a manometer, an oximeter and pH meter (no
blood gas equipment!).
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Message #33382
From: [email protected]
Subject: Melody Maxim's Distorted Reality 17
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Message #33383
From: [email protected]
Subject: Melody Maxim's Distorted Reality 17
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Message #33384
From: [email protected]
Subject: Melody Maxim's Distorted Reality 19
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Message #33385
From: [email protected]
Subject: Melody Maxim's Distorted Reality 18
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Message #33386
From: [email protected]
Subject: Melody Maxim's Distorted Reality 2
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Message #33387
From: [email protected]
Subject: Melody Maxim's Distorted Reality 20
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Message #33388
From: [email protected]
Subject: Melody Maxim's Distorted Reality 21
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Message #33389
From: [email protected]
Subject: Melody Maxim's Distorted Reality 22
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Message #33390
From: [email protected]
Subject: Melody Maxim's Distorted Reality 23
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Message #33391
From: [email protected]
Subject: Melody Maxim's Distorted Reality 24
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Message #33392
From: [email protected]
Subject: Melody Maxim's Distorted Reality 25
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Message #33393
From: [email protected]
Subject: Melody Maxim's Distorted Reality 26
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Message #33394
From: [email protected]
Subject: comments re Darwin
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End of CryoNet Digest
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