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Agreement between large and small cuffs in sphygmomanometry: a quantitative assessment
Y Iyriboz1, C M Hearon, K Edwards
1Department of Kinesiology, Louisiana State University, Baton Rouge 70803-1101.
Journal of Clinical Monitoring
|March 1, 1994
Summary
Blood pressure cuff size matters for accurate readings. A large cuff is recommended for routine U.S. adult measurements, as small cuffs overestimate blood pressure in individuals with larger arm circumferences.
Area of Science:
- Cardiovascular Health
- Medical Device Efficacy
- Public Health
Background:
- Accurate blood pressure (BP) measurement is crucial for diagnosing and managing hypertension.
- Cuff size selection is a critical factor influencing BP measurement accuracy.
- Variations in arm circumference within the U.S. population necessitate evaluating cuff size performance.
Purpose of the Study:
- To quantify agreement and differences between large (15 x 33 cm) and small (12 x 23 cm) BP cuffs.
- To assess BP measurement accuracy across varying arm circumferences in a U.S. population sample.
- To determine optimal cuff size recommendations for routine BP measurement.
Main Methods:
- Measured arm circumference and BP (12 readings each) in 85 subjects using a mercury sphygmomanometer.
- Classified subjects by arm circumference: small (<= 29 cm) and large (> 29 cm).
- Employed ANOVA, linear regression, difference between means, limits of agreement, and intraclass correlation for data analysis.
Main Results:
- Small cuffs generally overestimated BP compared to large cuffs across the sample.
- Clinically unacceptable limits of agreement were observed for small cuff overestimation (SBP -1.56 to 11.05 mm Hg; DBP -2.06 to 8.63 mm Hg).
- Measurements showed agreement between cuffs only in subjects with small arm circumferences (<= 29 cm).
Conclusions:
- Arm circumference significantly impacts proper BP cuff size selection.
- Small cuffs lead to BP overestimation in individuals with large arm circumferences (> 29 cm), representing over 75% of U.S. adults.
- Recommend using the large cuff for routine BP measurements in U.S. adults due to its broader applicability and accuracy.