Hypertension, Vol 5, 264-269, Copyright © 1983 by American Heart Association
M di Rienzo, G Grassi, A Pedotti and G Mancia
In the past few years noninvasive automatic blood pressure (BP) recorders
have been increasingly used to estimate patients' 24-hour BP more
accurately than by one or few isolated measurements. However, these
recorders only allow BP to be intermittently measured at intervals between
5 to 30 minutes, which means that the number of values collected over 24
hours (10 to 100) remains a tiny fraction of the thousands of values that
occur during the same period. To determine whether this represents a
limitation to this approach, BP was recorded intraarterially for 24 hours
(Oxford method) in 20 ambulant hypertensive patients. A beat-to-beat
analysis of the BP recording was provided by a computer, and the average
24-hour systolic, diastolic, and mean BP values were compared with those
obtained by analyzing single BP waves of the same recording at intervals of
5, 10, 15, 30, and 60 minutes. In each subject the average 24-hour BP
values obtained by the beat-to-beat analysis closely corresponded to those
obtained by the analysis performed at 5-, 10-, 15-, or 30-minute intervals.
In most subjects, this was the case also when the analysis was performed at
60- minute intervals. These findings demonstrate that intermittency of
measurements does not limit the accurate assessment of true average BP.
Indeed, accurate assessment can be achieved at intervals as much as 30 or
60 minutes apart.
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Continuous vs intermittent blood pressure measurements in estimating 24- hour average blood pressure
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