Background: Guidelines recommend measuring blood pressure (BP) in both arms and using the higher reading.
Aim: To determine interarm pressure difference (IAD) distribution and associated factors, and BP and atherosclerotic cardiovascular disease (ASCVD) risk classification using the higher and lower readings.
Design & setting: This cohort study used a representative cross-sectional sample of community-dwelling residents aged ≥40 years on four Caribbean islands (Barbados, Puerto Rico, US Virgin Islands, and Trinidad).
Method: BP was measured simultaneously in both arms. Mixed effects logistic and linear regression tested associations with an IAD. BP and ASCVD risk were classified using the higher and lower BP.
Results: Of 2912 participants (mean age 57.2 years), 10.7% (95% confidence interval [CI] = 9.6 to 11.8) and 3.3% (95% CI = 2.6 to 3.9) had systolic IADs ≥10 mmHg and ≥15 mmHg, respectively, and 5.0% (95% CI = 4.2 to 5.8) and 1.8% (95% CI = 1.3 to 2.3) diastolic IADs ≥10 mmHg and ≥15 mmHg, respectively. Independent associations with systolic and diastolic IADs ≥10 mmHg and/or continuous outcomes, included increasing body mass index (BMI), systolic and diastolic pressures and hypertension (P<0.05). Higher versus lower arm BP reclassified 10.3% (95% CI = 7.8 to 12.8) and 8.3% (95% CI = 5.9 to 10.7) from below to above the 130-mmHg and 140-mmHg systolic thresholds, respectively, 10.8% (95% CI = 8.2 to 13.3) and 6.9% (95% CI = 4.9 to 8.9) at the 80-mmHg and 90-mmHg diastolic thresholds, respectively, and 9.2% (95% CI = 0.0 to 18.4) of those with an IAD of ≥10 mmHg at the ≥10% 10-year ASCVD risk threshold.
Conclusion: Assessing both arms detects an IAD ≥10 mmHg and reclassifies BP in about 1 in 10 people. Increasing BMI and BP increase the risk of an IAD ≥10 mmHg or 15 mmHg.
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