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Bu yazi Blogcu Anne'ye yazilan bir yorumken, cok uzun olunca buraya aktardim:
Bu yazi Blogcu Anne'ye yazilan bir yorumken, cok uzun olunca buraya aktardim:
Aslina bakarsaniz ayni konuda yazmak istegim vardi. Fakat Blogcu Anne onceki yazilarinda ultrasonu konu edecegini belirttigi icin beklemeyi tercih ettim. Nurturia'daki yazismalari ise gozden kacirmisim.
Ultrason malum yuksek frekanstaki ses dalgalari kullanilan bir goruntuleme yontemi. ABD'de gerekmedikce ultrason cekilmiyor. Tamam sigortalarin gerekmeyen ultrasonlara para odemek istememesi bir sebep. Fakat durum eskiden boyle degilmis. Bir donem, alisveris merkezlerinde dahi 'ultrasoncu'lar turemis. Insanin hosuna gidiyor elbet surekli bebegini gorebilmek fikri. Diger taraftan kuskular epey bir artmis ultrasona karsi.
Yale Universitesi'nden Pasko Rakic'in onderliginde yapilan bir calisma ultrasonun fare embriyolarinda beyin kabugundaki hucrelerin gelisim sirasindaki goclerini etkiledigini gostermis. Yani hucreler varmasi gereken noktalara ilerleyememis ve ultrasona maruz kalma suresi arttikca bu etkinin daha da guclu oldugu gosterilmis.*
Bana bu calismadan Rakic ile calismis baska bir hoca bahsetmisti ilk olarak. Benim hic uygulamadigim bir teknik fakat deneysel olarak ultrasonu yani yuksek frekanstaki ses dalgalarini hucreleri tutunduklari yuzeyden koparmak icin kullandiklarini anlatti. Onun tavsiye ettigi, gerekmedikce ultrason cektirmemek.
Cekilen ultrasonun sikligi, suresi ayrica onemli bu durumda. Her seyde oldugu gibi abartmamak gerek diye dusunuyorum ben. Keyfi ultrasonlardan kacinmak en guvenlisi.
"We don’t want to push the panic button. It would be very wrong if women stopped having medically indicated ultrasounds because of this. Our study in mice does not mean that use of ultrasound on human fetuses for appropriate diagnostic and medical purposes should be abandoned." demis Rakic. **
Kisaca "Teshis ve tibbi gerekliligi olan ultrasonlardan kacinmamali".
*Prenatal exposure to ultrasound waves impacts neuronal migration in mice
Eugenius S. B. C. Ang, Jr, Vicko Gluncic, Alvaro Duque, Mark E. Schafer, Pasko Rakic; PNAS August 22, 2006 vol. 103 no. 34 12903-12910
Neurons of the cerebral neocortex in mammals, including humans, are generated during fetal life in the proliferative zones and then migrate to their final destinations by following an inside-to-outside sequence. The present study examined the effect of ultrasound waves (USW) on neuronal position within the embryonic cerebral cortex in mice. We used a single BrdU injection to label neurons generated at embryonic day 16 and destined for the superficial cortical layers. Our analysis of over 335 animals reveals that, when exposed to USW for a total of 30 min or longer during the period of their migration, a small but statistically significant number of neurons fail to acquire their proper position and remain scattered within inappropriate cortical layers and/or in the subjacent white matter. The magnitude of dispersion of labeled neurons was variable but systematically increased with duration of exposure to USW. These results call for a further investigation in larger and slower-developing brains of non-human primates and continued scrutiny of unnecessarily long prenatal ultrasound exposure.
**Ultrasound affects neural development in mice http://neurophilosophy.wordpress.com/2006/08/08/ultrasound-affects-neural-development-in-mice/
Ultrason malum yuksek frekanstaki ses dalgalari kullanilan bir goruntuleme yontemi. ABD'de gerekmedikce ultrason cekilmiyor. Tamam sigortalarin gerekmeyen ultrasonlara para odemek istememesi bir sebep. Fakat durum eskiden boyle degilmis. Bir donem, alisveris merkezlerinde dahi 'ultrasoncu'lar turemis. Insanin hosuna gidiyor elbet surekli bebegini gorebilmek fikri. Diger taraftan kuskular epey bir artmis ultrasona karsi.
Yale Universitesi'nden Pasko Rakic'in onderliginde yapilan bir calisma ultrasonun fare embriyolarinda beyin kabugundaki hucrelerin gelisim sirasindaki goclerini etkiledigini gostermis. Yani hucreler varmasi gereken noktalara ilerleyememis ve ultrasona maruz kalma suresi arttikca bu etkinin daha da guclu oldugu gosterilmis.*
Bana bu calismadan Rakic ile calismis baska bir hoca bahsetmisti ilk olarak. Benim hic uygulamadigim bir teknik fakat deneysel olarak ultrasonu yani yuksek frekanstaki ses dalgalarini hucreleri tutunduklari yuzeyden koparmak icin kullandiklarini anlatti. Onun tavsiye ettigi, gerekmedikce ultrason cektirmemek.
Cekilen ultrasonun sikligi, suresi ayrica onemli bu durumda. Her seyde oldugu gibi abartmamak gerek diye dusunuyorum ben. Keyfi ultrasonlardan kacinmak en guvenlisi.
"We don’t want to push the panic button. It would be very wrong if women stopped having medically indicated ultrasounds because of this. Our study in mice does not mean that use of ultrasound on human fetuses for appropriate diagnostic and medical purposes should be abandoned." demis Rakic. **
Kisaca "Teshis ve tibbi gerekliligi olan ultrasonlardan kacinmamali".
*Prenatal exposure to ultrasound waves impacts neuronal migration in mice
Eugenius S. B. C. Ang, Jr, Vicko Gluncic, Alvaro Duque, Mark E. Schafer, Pasko Rakic; PNAS August 22, 2006 vol. 103 no. 34 12903-12910
Neurons of the cerebral neocortex in mammals, including humans, are generated during fetal life in the proliferative zones and then migrate to their final destinations by following an inside-to-outside sequence. The present study examined the effect of ultrasound waves (USW) on neuronal position within the embryonic cerebral cortex in mice. We used a single BrdU injection to label neurons generated at embryonic day 16 and destined for the superficial cortical layers. Our analysis of over 335 animals reveals that, when exposed to USW for a total of 30 min or longer during the period of their migration, a small but statistically significant number of neurons fail to acquire their proper position and remain scattered within inappropriate cortical layers and/or in the subjacent white matter. The magnitude of dispersion of labeled neurons was variable but systematically increased with duration of exposure to USW. These results call for a further investigation in larger and slower-developing brains of non-human primates and continued scrutiny of unnecessarily long prenatal ultrasound exposure.
**Ultrasound affects neural development in mice http://neurophilosophy.wordpress.com/2006/08/08/ultrasound-affects-neural-development-in-mice/








