Related Experiment Video
Updated: Aug 7, 2026

High-Resolution Endocardial and Epicardial Optical Mapping in a Sheep Model of Stretch-Induced Atrial Fibrillation
Published on: July 29, 2011
Pulse upstroke in Africans
Abstract:
Electro-acoustic time intervals are measured on sphygmorecordings from the QRS to the Korotkoff sound. Simultaneously recorded brachial cuff pressures plotted against the interval for each beat constitute a sphygmochronogram. For a series of 56 individuals free of cardio-respiratory disease who presented at University College Hospital, Ibadan, the parameters of the sphygmochronogram showed expected intercorrelation but there was an unexpectedly short ti (electro-acoustic time interval at the inflection) of 0.16 + 0.02s, compared with 0.21 + 0.02s for series in the U.S.A. and Portugal. Values for dP/dt init. (rate of pressure rise in early ejection) were not reported for these series but our results are similar to those from Sweden.
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