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Blood pressure and heart rate variation between measurements times: Results of a cross-sectional study from 2017-2020 in Nghe An
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Abstract
Aim: To determine the variation of blood pressure and heart rate between measurements times, the prevalence of hypertension at each measurement, and the prevalence of hypertension after 3 measurements times. Subjects and Methods: The study included people aged 18 years and older, of both sexes, including those currently undergoing treatment for high blood pressure. A total of 10,260 individuals were screened. Before measurement, all participants abstained from stimulants and strenuous exercise, and rested for at least 5 minutes. Blood pressure was then measured in a sitting position, three times with 1-minute intervals, and the average was taken. The measurement room was airy with an ambient temperature of 30°C. The individuals performing the measurements, who were final-year students and nurses, were thoroughly trained in the measurement method and data recording. Results: The average blood pressure measured the first time (124.8/81.3 mmHg) was significantly higher than the second and third measurements (117.9/75.0 mmHg; 117.2/74.3 mmHg). Blood pressure measurements from the second and third times were similar. Heart rate at the first measurement was significantly higher than at the second and third measurements (84.3 bpm vs. 77.8 bpm; 76.9 bpm). The rate of increased blood pressure varied between measurements and decreased gradually from the first to the third measurement: 34.1% for the first measurement, 19.1% for the second measurement, and 16.3% for the third measurement. The average of the three measurements was 22.0%. The rate of achieving target blood pressure was 7.2%. Conclusion: Blood pressure and heart rate varied between measurements times, decreasing gradually from the first to the third measurement. Therefore, it is necessary to adhere to measuring blood pressure 3 times and taking the average to avoid overdiagnosis. Nearly one-third of the population aged 18 years and older has hypertension.
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References
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