How You Position Your Arm Can Alter Blood Pressure Readings, According To Scientists

 

According to Johns Hopkins researchers, improper arm positioning can lead to significantly high blood pressure readings, potentially misdiagnosing individuals with hypertension. Supporting the arm on the lap can overestimate systolic pressure by nearly, while a dangling arm can increase it by up to 7mmHg

Key Findings from the Study:

• The Problem: The most accurate readings come from supporting the arm on a desk. When the arm is not properly supported, the reading can drift into the "danger zone" for high blood pressure.
• Lap Support: Resting the arm on the lap can overestimate systolic pressure (top number) by ~3.9 mmHg and diastolic (bottom number) by ~4 mmHg.
• Dangling Arm: An unsupported arm at the side can overestimate systolic pressure by ~6.5 mmHg and diastolic by ~4.4 mmHg.

• The Impact: These inaccuracies are high enough to misclassify a person from "normal" to "elevated" or even to Stage 2 hypertension, potentially leading to unnecessary medication, say researchers from UCLA Health and Mount Sinai. 

Correct Procedure for Accurate Readings:

• Support the Arm: Ensure the arm rests on a flat surface, such as a table.
• Heart Level: The middle of the blood pressure cuff should be at the same level as the right atrium of the heart

 

·         Sit Properly: Keep feet flat on the floor and avoid crossing legs.

·         Remain Still: Avoid talking during the measurement.

These findings, published in JAMA Internal Medicine and EurekAlert, suggest that inconsistent arm positioning is a major source of error in both home and clinical settings.