Why the study?
Do automatic blood pressure devices (Dinamap 845 and Sentry) provide comparable measurements to a standard mercury sphygmomanometer?
Do automatic blood pressure devices (Dinamap 845 and Sentry) provide comparable measurements to a standard mercury sphygmomanometer?
Automatic blood pressure devices may yield significantly different diastolic readings compared to standard mercury sphygmomanometers, which is not explained by physician-induced emotional pressor responses.
Answers are grounded in this paper and cite their sources.
Automatic devices may underestimate diastolic BP by ~7 mmHg vs mercury; leaves open their equivalence for clinical/research use.
Blood pressure measurement with two automatic devices, Dinamap 845 and Sentry, was compared with the standard mercury sphygmomanometer, by means of a 3-period crossover experiment. Both automatic devices read diastolic pressure considerably lower than the mercury sphygmomanometer (about 7 mmHg on average); agreement was better for systolic pressure. Device differences in individual patients were often much higher. To assess the patient's emotional pressor response during manual measurement, Dinamap was used to monitor blood pressure before, during and after measurement with the mercury sphygmomanometer. No rise in pressure was found. It is concluded that the three devices can often give different values, and that the physician's involvement cannot explain these differences.
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Bassein et al. (1985) studied this question.
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