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Correlation between objective automatic and auscultatory mercury manometer blood pressure measurements
M D Gonzalez Biosca1, A Fernandez-Cruz, S Mizushima
1WHO Collaborating Center for Research on Primary Prevention of Cardiovascular Diseases, Shimane Medical University, Izumo, Japan.
Journal of Cardiovascular Pharmacology
|January 1, 1990
Summary
The automatic blood pressure (BP) device showed high accuracy for systolic BP but significantly underestimated diastolic BP compared to the mercury manometer. This suggests clinical diastolic BP measurements may be overestimated in adults.
Area of Science:
- Cardiovascular Health
- Medical Device Technology
- Public Health Research
Background:
- Accurate blood pressure (BP) measurement is crucial for cardiovascular disease management.
- The World Health Organization (WHO) Cardiovascular Diseases and Alimentary Comparison (CARDIAC) Study utilized an automatic BP device.
- Validation of automated BP devices against standard methods is essential.
Purpose of the Study:
- To compare the accuracy of an automatic BP measurement device (A) against a standard auscultatory-mercury manometer (M).
- To evaluate the performance of the automatic device within the context of the WHO CARDIAC Study.
- To assess potential overestimation of diastolic BP in clinical practice.
Main Methods:
- A comparative study involving 440 participants aged 50-54 years (50% male, 50% female).
- Simultaneous BP recordings were taken on the same arm using both automatic device (A) and mercury manometer (M).
- Analysis included 1,440 readings for both systolic BP (SBP) and diastolic BP (DBP), with correlation and consistency checks.
Main Results:
- Systolic BP (SBP) measurements showed excellent agreement between device A and manometer M (127.5 vs. 127.6 mm Hg, p > 0.05).
- Diastolic BP (DBP) measurements differed significantly, with manometer M yielding higher readings than device A (79.3 vs. 71.3 mm Hg, p < 0.001).
- High correlations were observed for both SBP (r=0.95) and DBP (r=0.88), but consistency was poor for DBP.
Conclusions:
- The automatic BP device demonstrates high accuracy for systolic BP measurement.
- Significant discrepancies in diastolic BP readings suggest potential overestimation by standard clinical auscultatory methods.
- Further investigation into the accuracy of automated vs. manual diastolic BP measurement in adults is warranted.