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Re: OB:Home Births in AustraliaFrom: MS GAIL M HART (YTDP43A@prodigy.com)Mon Aug 31 14:10:50 1998
RE<< dan<<<Studies done in the early 70's showed that professionals listening to tapes of fetal heart sounds and counting them were not very accurate at all especially if the heart rate was above 150 or below 130. The errors were frequently in the range of 50 BPM.<< well, the human ear/brain partnership is certainly not as accurate as a machine, but I can't imagine ANYONE mistaking a FHR of 150 for one of 200! I think we can expect a more usual error rate of perhaps 10bpm. And is that common error range actualy crucial? Many handheld dopplar stethoscopes these days have a readout to confirm FHR. Haven't many of us though had the opposite experience of "hearing" a certain rate even though the electronic readout is artifactualy giving an obviously erroneous rate?
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