Influence of arm position on measurement of blood pressure.Br Med J (Clin Res Ed) 1984; 288 doi: https://doi.org/10.1136/bmj.288.6430.1574 (Published 26 May 1984) Cite this as: Br Med J (Clin Res Ed) 1984;288:1574
- J Webster,
- D Newnham,
- J C Petrie,
- H G Lovell
A series of measurements of blood pressure in normotensive and hypertensive subjects showed that measurements made with a sphygmomanometer with the arm dependent by the side were consistently higher than those made with the arm horizontal at heart level. The mean difference in a group of 90 hypertensive outpatients was 11/12 mm Hg. Failure to appreciate the importance of arm position may lead to erroneous measurements of blood pressure. This has important implications for clinical practice and research.