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Association Between Follow-Up Mean Blood Pressure and Blood Pressure Control: A Meta-Regression Analysis of 101
Abdul Salam1,2,3, Rupasvi Dhurjati1, Rashmi Pant1
1The George Institute for Global Health, Hyderabad, Telangana, India (A.S., R.D., R.P., S.K.T., K.N., S.R., A.M., K.V., E.H.).
Insights
Achieving blood pressure control is crucial for hypertension management. Lowering systolic blood pressure below 125 mm Hg is associated with approximately 80% of patients reaching their blood pressure control goals.
Area of Science:
- Cardiovascular Medicine
- Clinical Trials
- Hypertension Research
Background:
- The precise mean blood pressure (BP) threshold for achieving BP control (<140/90 mm Hg) in most patients remains unclear.
- Understanding this relationship is vital for effective hypertension management strategies.
Purpose of the Study:
- To assess the association between mean BP and BP control.
- To analyze data from randomized clinical trials (RCTs) to quantify this relationship.
Main Methods:
- A systematic literature search identified individual and cluster RCTs involving adults randomized to BP-lowering interventions.
- Linear regression analysis was employed to evaluate the association between mean BP and BP control rates.
Main Results:
- Analysis of 101 RCTs (65 iRCTs, 36 cRCTs) revealed a strong correlation between mean systolic BP (SBP) and BP control.
- A 1 mm Hg reduction in mean SBP was linked to an approximate 2% increase in BP control, consistent across various subgroups.
- Mean SBP levels of 120-135 mm Hg corresponded to BP control rates between 55% and 85%.
Conclusions:
- A systolic BP below 125 mm Hg was associated with achieving BP control in approximately 80% of patients.
- These findings offer valuable insights for hypertension guidelines, clinical practice, and public health programs.
Background:
The relationship between mean blood pressure (BP) and BP control remains uncertain, particularly the mean BP required to achieve BP control (<140/90 mm Hg) in most patients. This review assesses the association between mean BP and BP control using data from randomized clinical trials (RCTs).
Methods:
Electronic literature databases were searched to identify individual RCTs (iRCTs) and cluster RCTs (cRCTs) that randomized adults to BP-lowering interventions and reported both mean BP at the final follow-up visit (mean BP) and the proportion of participants achieving BP control at the final follow-up visit (BP control).
Results:
A linear regression model was used to evaluate the association between mean BP and BP control. A total of 101 RCTs (65 iRCTs [57 201 participants] and 36 cRCTs [28 154 participants]) were included. Overall, mean systolic BP (SBP) of 120, 125, 130, and 135 mm Hg corresponded to BP control in 85%, 75%, 65% and 55% of the participants in iRCTs and 91%, 80%, 68%, 56% in cRCTs. Each 1 mm Hg reduction in mean SBP was associated with approximately a 2% increase in BP control (Pseudo-R2=78% for iRCTs; 76% for cRCTs). This association was consistent across BP-lowering drug classes, baseline SBP categories, and pretrial treatment status in iRCTs, and across country income levels and baseline SBP categories in cRCTs. A similar association was seen for DBP.
Conclusions:
An SBP below 125 mm Hg was associated with achieving BP control in ≈80% of patients. These findings can inform guideline recommendations, guide clinical management and shape hypertension control programs.
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