February 1, 1985American Journal of Epidemiology
The Random-Zero Versus the Standard Mercury Sphygmomanometer: A Systematic Blood Pressure Difference
Why the study?
Does the random-zero sphygmomanometer yield systematically different blood pressure readings compared to the standard mercury sphygmomanometer?
Population
Subjects undergoing blood pressure measurement in a series of six experiments
Comparison
Blood pressure measurement using a random-zero… vs Simultaneous blood pressure measurement using a…
Design
Other, Order of use of the random-zero sphygmomanometer was randomly assigned…
Authors
Discussion
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Member takes
Implication
Random-zero sphygmomanometers may underestimate BP versus mercury at standard deflation; leaves open whether device-specific adjustments are required in legacy cohorts.
Structured PICO
Does the random-zero sphygmomanometer yield systematically different blood pressure readings compared to the standard mercury sphygmomanometer?
P
Population
Subjects undergoing blood pressure measurement in a series of six experiments
I
Intervention
Blood pressure measurement using a random-zero sphygmomanometer
C
Comparator
Simultaneous blood pressure measurement using a standard mercury sphygmomanometer
O
Outcome
Difference in systolic, fourth-phase, and fifth-phase diastolic blood pressure readingssurrogate
The random-zero sphygmomanometer yields systematically lower blood pressure readings than the standard mercury sphygmomanometer, indicating they should not be used interchangeably in epidemiologic studies.
Cite This Study
Gaudemaris et al. (1985) studied this question.