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Tero Toivanen

Autism and early oxygen deprivation | On the Brain by Dr. Mike Merzenich,Ph.D. - 0 views

merzenich.positscience.com/?p=181

autism umbilical cord oxygen deprivation

shared by Tero Toivanen on 04 Jun 09 - Cached
  • we had dismissed perinatal anoxia as a likely factor contributing to autism’s apparent rise because we could not see how ITS incidence could be growing over the past several decades.
  • it has recently been argued that the especially high susceptibility of the highly metabolically active auditory brainstem to brief periods of anoxia that we and others have documented comes into play in the few to many tens of seconds of oxygen starvation that can stem from very rapid umbilical cord clamping— practices for which have changed (more rapid clamping has been adopted) over the past several decades.
  • earlier clamping of the umbilical cord became the standard of care world-wide beginning in the mid 1980’s, i.e., corresponding to the epoch in which scientists and educators began to first recognize an increase in autism incidence.
  • ...3 more annotations...
  • Why change an age-old practice invited by Mother Nature or the Creator of the Universe, when it is so obviously a product of 80 million years of natural selection?! Why race to get that clamp on the umbilical cord well before blood flow in the cord stopped on its own?
  • Interestingly, the obstetrics profession itself seems to be questioning the adoption of use of early-clamping procedures, as several important meta-analyses have now shown that late cord clamping (after the umbilical flow has stopped on its own = Nature’s Way) is (big surprise) beneficial to the newborn, with significant positive benefits for late (more natural) cord clamping recorded (in ferritin, which translates to hemoglobin which translates to oxygenation) up to 6 months later (e.g., see Hutton & Hassan, JAMA 297:1241).
  • It shall be interesting to see whether or not changes in these practices back to the “old way” results in a reduction in autism incidence. Stay tuned — because it looks like the experiment is now underway!
  • Tero Toivanen on 04 Jun 09
     
    Earlier clamping of the umbilical cord became the standard of care world-wide beginning in the mid 1980's, i.e., corresponding to the epoch in which scientists and educators began to first recognize an increase in autism incidence.
Tero Toivanen

Autism and early oxygen deprivation 2 | On the Brain by Dr. Mike Merzenich,Ph.D. - 0 views

merzenich.positscience.com/?p=248

autism oxygen deprivation placenta Amish Somalia umbilical cord

shared by Tero Toivanen on 25 Jun 09 - Cached
  • Fraternal twins typically have different placentas, whereas identical twins share a placenta but have different cords. The blood supply, and pre-clamping susceptibility to anoxia, would surely be different.
  • As for the idea that one could statistically detect whether cord clamping is the problem, we can! Amish people do not clamp the cord until placental delivery, and they have no autism rate. The same is true in Somalia, but Somalian immigrants to westernized medical countries have high rates. Try to systematically find out autism rates and immediate cord clamping rates, on a country by country, or region by region basis. It is a task someone should get on immediately, but it will take a lot of effort.
  • An interesting discussion of the “Amish anomaly” re autism incidence has been provided by Dan Olmsted, who went to Amish Country to find the 150 or so individuals there who could be expected to be severely autistic. They aren’t there. He seems pre-disposed to believe that the difference lies with their non-vaccination. Many studies now show that this is unlikely. As David Blake points out, there is another difference in this population: In Amish birthing, by tradition, the cord is not clamped prior to placenta delivery.
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  • The picture with autism in Somali children is a little murkier. It turns out that the incidence of autism is very high in children of Somali origin who were born in the US (several times higher than normal), while it appears to be very low in Somali children born in their native country. Again, vaccination has been identified as the likely cause by Somali parents and by many observers — but again, clamping follows placental delivery in Somalia, while the cord has been clamped without delay as a general practice in Minnesota, where a high incidence of autism in these children of Somali immigrants was first discovered.
  • Tero Toivanen on 25 Jun 09
     
    Comment about the hypothesis that early umbilical cord clamping might contribute to the risk of origin of autism.
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