Accuracy of the Omron RX-M, an automated blood pressure measuring device, measuring blood pressure at the wrist, according to a modified British Hypertension Society protocol.
OBJECTIVE
To determine the accuracy of the Omron RX-M, a device measuring blood pressure oscillometrically at the wrist.


METHODS
In 89 subjects (mean age 55+/-14 years) blood pressure measurements at the wrist with the Omron RX-M were compared to sequential blood pressure measurements with a mercury sphygmomanometer at the (same) upper-arm and to simultaneous measurements with the Omron HEM-705 CP at the opposite arm.Measurements with analyzed according to the British Hypertension Society (BHS) - protocol 1993, to the protocol of the Association for the Advancement of Medical Instrumentation (AAMI) and (retrospectively) to the new 'International Protocol'.


RESULTS
Mean differences (+/-SD) between the measurements with the mercury sphygmomanometer and the Omron RX-M were -7.5+/-8.4 mmHg for diastolic blood pressure (DBP) and -2.5+/-12.2 mmHg for systolic blood pressure (SBP), thus not fulfilling the AAMI-criteria (< or =5+/-8). According to the BHS-criteria a grade D was achieved for both DBP and SBP. Compared to the Omron HEM 705 CP results were -6.3+/-7.1 for DBP (grade D) and -4.1+/-12.7 for SBP (grade D). The Omron RX-M also failed to pass the new 'International Protocol' in phase 1.


CONCLUSIONS
Although easy to use, based on this study the Omron RX-M can not be recommended to determine blood pressure accurately.
Braam
Richard L
RL
Department of Internal Medicine, University Medical Centre St. Radboud, Nijmegen, The Netherlands.
Aslan
Benjamin
B
Thien
Theo
T
D000328:Adult; D000368:Aged; D001331:Automation; D001794:Blood Pressure; D001795:Blood Pressure Determination / Q000295:instrumentation* / Q000592:standards; D015924:Blood Pressure Monitors / Q000592:standards*; D004868:Equipment Failure; D019983:Guideline Adherence; D006801:Humans; D008875:Middle Aged; D014953:Wrist