A randomized clinical trial of 133 adults published in JAMA Internal Medicine showed that arm position can have an effect on blood pressure (BP) readings. When subjects supported their arm on their lap, it resulted in systolic BP readings overestimated by 3.9 mm Hg and diastolic BP readings overestimated by 4.0 mm Hg. Additionally, an unsupported arm at the subject’s side overestimated systolic BP by 6.5 mm Hg and diastolic BP by 4.4 mm Hg. …
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