Are Two Really Better Than One?: Empirical Examination of Repeat Blood Pressure Measurements and Stroke Risk in the Renfrew/Paisley and Collaborative Studies
Key result
Two blood pressure measurements were more strongly related to stroke risk over 17 to 21 years of follow-up than a single measurement.
Why the study?
Does measuring blood pressure on two occasions improve the estimation of stroke risk compared to a single measurement in a general population?
Population
9,245 individuals from 2 prospective cohort studies in Scotland
Comparison
Blood pressure measured on 2 occasions vs Blood pressure measured on a single occasion
Design
Cohort
Follow-up
17 and 21 years
Authors
Discussion
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Member takes
Implication
May refine long-term stroke risk estimates with repeated BP readings; extends cohort data but should not yet change practice.
Study Design
Type
Cohort (n=9,245)
Multicenter
Yes
Structured PICO
Does measuring blood pressure on two occasions improve the estimation of stroke risk compared to a single measurement in a general population?
P
Population
9,245 men and women from two prospective cohort studies in Scotland, followed for 17 to 21 years to assess stroke risk based on repeat blood pressure measurements.
E
Exposure
Blood pressure measured on 2 occasions (mean 4 and 5 years between screenings)
C
Comparator
Blood pressure measured on a single occasion
O
Outcome
Stroke (defined as stroke mortality or hospital admission for stroke) over 17-year and 21-year follow-up periodshard clinical
Two blood pressure measurements separated by several years provide a more accurate estimate of long-term stroke risk than a single measurement, reducing risk misclassification.
Cite This Study
Hart et al. (2001) conducted a cohort in Stroke risk (n=9,245). Two blood pressure measurements vs. One blood pressure measurement was evaluated on Stroke, defined as stroke mortality or hospital admission for stroke. Two blood pressure measurements were more strongly related to stroke risk over 17 to 21 years of follow-up than a single measurement.