Blood pressure readings can be skewed by arm shape and cuff size, with automated measurements often underestimating systolic BP, especially in women and with larger cuffs, potentially leading to misdiagnosis and undertreatment of hypertension.
The fit of an arm cuff used to measure blood pressure can significantly affect the accuracy of readings, especially for individuals with larger arms, according to a study published in JAMA Internal Medicine. Researchers found that using a standard cuff size for all individuals led to "strikingly inaccurate" readings. Properly fitting cuffs are crucial to avoid over-treatment or under-treatment, which can increase the risk of heart attack, stroke, and other health complications. It is recommended to individualize blood pressure cuffs based on arm size and consult with a healthcare provider to ensure accurate readings. Other factors, such as activity level, positioning, and anxiety, can also impact blood pressure readings.