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You usually will not get accurate pressures with electronic equipment. It is because the mathematical forumulas inside the equipment cannot account for the irregular heart rate in calculating the blood pressure. Therefore, you should do a manual blood pressure as I have described above.
Thought you might find this interesting:
Accuracy xxxxxx automated blood pressure monitor.
Beaubien ER, Card CM, Card SE, Biem HJ, Wilson TW.
Division of Nephrology, McGill University, Montreal, Quebec, Canada. email@example.com
Accurate blood pressure (BP) measurement is important for the detection and treatment of hypertension. Despite widespread use of automated devices, there is limited published evidence for their reliability and accuracy. To determine the reliability and accuracy of the xxxxxx, a commonly used non-invasive oscillometric BP monitor The Dinamap was evaluated against the mercury manometer in 70 randomly selected adult hospitalised medical patients. Each individual underwent three sets of standardised BP measurement by automated method and three sets by mercury manometer by two independent observers. Reliability of BP measurement was assessed by repeated measures analysis. Dinamap accuracy was evaluated according to the American Association of Medical Instrumentation (AAMI) and British Hypertension Society (BHS) guidelines. Most patients were either normotensive or had stage I hypertension. The Dinamap tended to overestimate lower diastolic BP, and displayed poor reliability (P < 0.05). despite meeting aami guidelines, only 59% of systolic and 56% of diastolic dinamap readings were within 5 mm hg of the mercury manometer and 84% of systolic and 80% of diastolic readings were within 10 mm hg (bhs grade c). systolic and diastolic accuracy were worse with pressures >160/90 mm Hg (grade D) although these measures were based on a smaller sample of subjects. In conclusion the Dinamap yields inaccurate estimates of both systolic and diastolic BP even under standardised, and thus optimal conditions. This inaccuracy is exaggerated at higher BP (>160/90 mm Hg), although the number of measurements at higher pressures was small. We recommend that this device not be used when accurate BP measurement is needed for therapeutic decision-making.
PMID: 12214262 [PubMed - indexed for MEDLINE]