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Re: Hi From: udaya kumar (udaya@md2.vsnl.net.in) Sun Feb 17 09:08:15 2002 Messages sorted by: [ date ][ thread ][ subject ][ author ] Next message: James S Smeltzer MD: "Re: Disappearing twin?" Previous message: Rich Dempsey RDMS/RVT : "US Professional Contacts in Portugal ?" Maybe in reply to: ND: "Hi" Next in thread: Dianne Walkup: "Re: Hi" I believe this is due to fetal breathing movements. Wait until the waves are even ( Chest movements stopped) before measuring the index. I've seen waves like what you are describing, and every alternate wave ( small or tall ) has the same even velocity. But, I have wondered, how a chest movement rate can match a heart rate to produce the same pressure difference for each stroke. Theoretically, this would happen only if the 2 rates ( Chest and Heart) are the same. Unconvinced as I am, and with many shouting for chest movement theory, I have just kept quiet. One vociferous shout for the above theory was from an Australian (application specialist)  based in Hongkong (  Phillip Ram?) with whom I've had long parleys on the particular waveform. Good to see you here Nirvi, Dr.Udayakumar   ND wrote: > Hi > > I have one query - What happens when you get Umblical artery waveforms that > are not regular in their amplitude - one small and one large - occuring > regularly - kind of alternating and sometimes maybe not. The S/D Ratio for > the "smaller" wave and the "Larger" waves is different. > Which wave should we take for measuring doppler parameters and Why does this > kind of phenonmenon happen? The question is open to the forum. > > Terry, Please send me the manner in which we can post images/cases on the > forum. > > Thanks You > > Dr Nirvikar Dahiya Next message: James S Smeltzer MD: "Re: Disappearing twin?" Previous message: Rich Dempsey RDMS/RVT : "US Professional Contacts in Portugal ?" Maybe in reply to: ND: "Hi" Next in thread: Dianne Walkup: "Re: Hi"

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