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.

Adolescent↗