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Saturday, 13/12/2025 | 08:02 GMT+7

Common errors that skew blood pressure readings

Using an ill-fitting cuff, talking during measurement, or crossing legs can lead to inaccurate blood pressure results.

An ill-fitting cuff is a common error in blood pressure measurement. Both oversized and undersized cuffs can produce inaccurate readings. A cuff that is too small, for instance, may elevate results by 2-10 mm Hg.

Talking during measurement can also skew results. Remaining still and silent is crucial, as even minor movements or conversations can increase readings by approximately 10-15 mmHg.

Measuring blood pressure with a full bladder can also lead to inaccuracies. A full bladder activates the sympathetic nervous system, causing a slight rise in heart rate and blood vessel constriction. This temporary effect can elevate blood pressure readings by 10-15 mmHg.

Incorrect arm positioning also impacts blood pressure readings. The arm should rest at heart level, supported on a flat surface with the palm facing up. Positioning the arm too high or too low can alter results by 10 mm Hg, either increasing or decreasing them.

Crossing your legs compresses blood vessels in the thighs and calves. This compression increases resistance to blood flow, which can elevate blood pressure readings by 2-8 mm Hg.

Lack of back and foot support during measurement can also affect accuracy. Sitting without back support engages abdominal and back muscles, activating the sympathetic nervous system. This action can slightly raise both heart rate and blood pressure, potentially increasing readings by 5-10 mm Hg.

Measuring blood pressure at the wrong time can also lead to inaccurate results. Avoid eating, drinking caffeine, smoking, or exercising for at least 30 minutes before taking a reading, as these activities can temporarily elevate heart rate and blood pressure. Stress or anxiety can similarly increase readings. For accurate results, measure blood pressure in a quiet, comfortable environment.

To prevent high blood pressure, maintain a healthy lifestyle. This includes a low-salt diet, increasing potassium-rich fruits and vegetables, managing weight, regular exercise, limiting alcohol, and reducing stress. Home remedies like warm foot baths, deep breathing, and neck and ear massages may also help.

Le Nguyen (According to Times of India)

Readers can submit cardiovascular questions here for doctors to answer.
By VnExpress: https://vnexpress.net/loi-thuong-gap-lam-sai-lech-ket-qua-do-huyet-ap-4992968.html
Tags: cardiovascular blood pressure measurement

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