Comparison of manual versus automated blood pressure measurement in intensive care unit
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OBJECTIVE:
To determine the accuracy of three automatic monitors (arm, wrist, finger)
for blood pressure measurement manufactured by Omron compared with a standard mercury
sphygmomanometer.
PRIMRY END POINT: Difference in the mean blood pressure readings from each
monitor; the secondary end point was difference in pulse readings.
DESIGN:
A single-visit, crossover trial tested each device twice on the left arm of
each participant; the average of the two readings was recorded. The pulse
readings from each monitor were also recorded. ANOVA was used to compare mean
blood pressure readings and pulse readings from each device.
RESULTS:
A total of 55 persons (mean age 53 y; 36 women) met inclusion criteria and
completed the study. The mean systolic and diastolic readings obtained from the
electronic arm unit were comparable to the mercury readings (124.4/78.02 vs.
129.45/77.87 mm Hg, respectively; p > 0.05 for both readings). The mean
results obtained from the wrist and finger monitors differed significantly from
those of the mercury readings (145.44/89.58 and 113.94/69.07 mm Hg,
respectively; p < 0.05 for both monitors compared with control). No
difference was measured in the mean pulse readings between the comparisons (p =
0.72). The absolute difference in systolic and diastolic blood pressure
readings from control varied the least with the arm monitor.
CONCLUSIONS:
Compared with the mercury sphygmomanometer,
the arm monitor was the most accurate in measuring blood pressure. The wrist
and finger monitors resulted in statistically significant mean systolic and
diastolic differences compared with the mercury sphygmomanometer.
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