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The effect of cuff size on blood pressure measurement in adults
J M Sprafka1, D Strickland, O Gómez-Marín
1Division of Epidemiology, School of Public Health, University of Minnesota, Minneapolis 55455.
Insights
Using the wrong blood pressure cuff size significantly impacts readings. Incorrect cuff sizes can lead to misdiagnosis of hypertension, highlighting the importance of proper cuff selection for accurate blood pressure measurement.
Area of Science:
- Clinical Medicine
- Cardiovascular Health
- Medical Devices
Background:
- Accurate blood pressure measurement is crucial for diagnosing and managing hypertension.
- Cuff size selection is a critical factor influencing blood pressure readings.
- Inappropriate cuff sizes may lead to systematic errors in systolic and diastolic blood pressure measurements.
Purpose of the Study:
- To quantify blood pressure differences resulting from the use of incorrect cuff sizes.
- To assess the impact of cuff size on the classification of hypertension.
- To determine the accuracy of blood pressure measurement with appropriately sized cuffs versus standard and oversized cuffs.
Main Methods:
- 181 adult participants (aged 25-74 years) were enrolled.
- Blood pressure was measured using small, large, and appropriately sized cuffs determined by arm circumference.
- A randomized sequence of measurements was employed to minimize bias.
Main Results:
- Oversized cuffs underestimated systolic and diastolic blood pressure by 3-5 mm Hg in men and 1-3 mm Hg in women.
- Undersized cuffs overestimated systolic and diastolic blood pressure by 2-6 mm Hg in men and 3-4 mm Hg in women.
- 30-40% of participants were misclassified regarding hypertension status based on incorrect cuff size usage.
Conclusions:
- Cuff size significantly affects blood pressure readings, leading to potential under- or overestimation.
- Improper cuff selection can result in a substantial proportion of individuals being misclassified as hypertensive or not.
- Emphasizes the critical need for accurate cuff size determination to ensure reliable blood pressure monitoring and diagnosis.
Abstract:
We measured blood pressure differences by cuff size in 181 adults aged 25 to 74 years, allocated to a random sequence that involved the measurement of blood pressure using a small cuff, a large cuff, and an appropriate cuff as determined by standardized arm circumference measurement. Systolic and diastolic blood pressure were underestimated by 3-5 mm Hg in men and 1-3 mm Hg in women when the cuff was one size larger than appropriate. Systolic and diastolic blood pressure were overestimated by 2-6 mm Hg in men and 3-4 mm Hg in women when the cuff was one size smaller than appropriate. In addition, 30-40% of subjects were "misclassified" when blood pressure cutpoints were used to define hypertension.