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Re: OB: Ultrasound stories yet againFrom: Terry J DuBose (DuBoseTerryJ@UAMS.edu)Thu Aug 10 12:18:55 2006
"Any how I can tell you from my experience of 15 years that fetuses would usually be disturbed and close their ears with their hands during ultrasound scan." I find your statement interesting. I do remember a sonographic machine in the early 1980s that had some kind of high pitched humm or buzz, but I have not observed fetuses closing “their ears with their hands during ultrasound scan.” Pulling their ear, nose, and eye poking, perhaps, but closing their ears with their hands? I don't think so. Being curious about reports of sonography creating sound similar to a subway train, we tried to test this. You can see our first report at: http://www.uams.edu/chrp/sonography/pdf_files/FetalHearing&Sonography.pdf Disclaimer: This study is not peer-reviewed and is continuing. As to the report on ultrasonic energy effect on mouse brains; since the report is in the Proceedings from the National Academy of Sciences it may not have been published yet, but only presented as an oral report at the meeting. But I do not believe it is a hoax. One of the best articles I have found on it is at: http://news.yahoo.com/s/nm/20060807/ts_nm/ultrasound_dc Also, you can listen to the NPR report from yesterday morning at: http://www.npr.org/templates/story/story.php?storyId=5626094 If you are looking for ultrasonic bioeffects, there is a lot of new information coming out of the research into sonothrombolysis. Check these out for information about lower frequency transcranial sonography and ultrasound causing brain hemorrhages in thrombolytic therapy… of course this is from very low frequencies often less than 1 MHz. Daffertshofer M, Gass A, Ringleb P, Sitzer M, et al; Transcranial Low-Frequency Ultrasound-Mediated Thrombolysis in Brain Ischemia; Stroke, 2005, 36:1441-1446. Reinhard M, Hetzel A, Kruger S, Kretzer S, et al; Blood-Brain Barrier Disruption by Low-Frequency Ultrasound; Stroke 2006;37;1546-1548; Also, the Yale press release on the mouse brains is here: http://www.yale.edu/opa/newsr/06-08-07-01.all.html Hope this helps. Terry
-- Peace, Terry J DuBose Little Rock, Arkansas USA
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