This common mistake can add nearly 7 points to your blood pressure reading — SkimNews
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- Johns Hopkins Medicine researchers found that leaving the arm unsupported at a patient's side overestimates systolic blood pressure by 6.5 mmHg and diastolic pressure by 4.4 mmHg compared with the recommended desk-supported position.
- Resting the arm on the lap, another common clinical posture, overestimated systolic BP by 3.9 mmHg and diastolic BP by 4.0 mmHg, according to the JAMA Internal Medicine study.
- Study author Sherry Liu noted the 6.5 mmHg gap could mean the difference between a systolic reading of 123 and 130, or 133 and 140 — the threshold for stage 2 hypertension.
- The study enrolled 133 adults (78% Black, 52% female) between Aug. 9, 2022, and June 1, 2023, and tested three seated arm positions in a randomized crossover design with carefully controlled measurements.
- Senior author Tammy Brady said the findings reinforce American Heart Association guidelines calling for the arm to be firmly supported on a desk at mid-heart level, adding that patients 'must advocate for themselves' during clinical and at-home readings.
- The researchers cautioned the results may apply only to automated blood pressure devices and do not necessarily extend to other equipment types.
Why it matters: Roughly half of U.S. adults have elevated blood pressure per the American Heart Association, and a single routinely used arm position can add nearly 7 mmHg to a systolic reading — enough to flip borderline patients into a hypertension diagnosis and trigger unnecessary medication or lifestyle intervention.
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