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  • Title: A new audiovisual technique for recording blood pressure in research: the Sphygmocorder.
    Author: O'Brien E, Atkins N, Mee F, Coyle D, Syed S.
    Journal: J Hypertens; 1995 Dec; 13(12 Pt 2):1734-7. PubMed ID: 8903642.
    Abstract:
    OBJECTIVE: To devise a method of blood pressure measurement capable of being substituted for the fallible human observer in validation of blood pressure measuring devices. DESIGN: A number of components used to measure blood pressure have been combined innovatively with audiovisual recording technology to produce a system, named the Sphygmocorder, which consists of a mercury sphygmomanometer, an occluding cuff, an inflation source, a stethoscope, a microphone capable of detecting Korotkoff sounds, a camcorder and a display screen. METHODS: To determine the accuracy of the Sphygmocorder against the trained human observer, the Sphygmocorder has been validated in three separate studies in which three devices for self-measurement of blood pressure, the Omron HEM-705CP, the Phillips HP5332 and the Nissei DS-175, were being validated against two trained observers in 85 subjects with a wide range of blood pressure according to the protocol of the British Hypertension Society. RESULTS: The Sphygmocorder was as accurate as at least one of the observers in each of the validation studies and therefore allows replacement of trained observers by the new device. CONCLUSION: The Sphygmocorder, which retains the time-honoured technique of blood pressure measurement with a mercury sphygmomanometer and an auscultating observer, and provides, in addition, objective evidence of the measurement recorded, which can be stored and re-examined, can be used as a substitute for human observers in validation studies of blood pressure-measuring devices.
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