Heart Failure Prevention in Older Patients Using Intensive Blood Pressure Reduction: Potential Role of Diuretics

Area of Science:

• Cardiology
• Clinical Trials
• Pharmacology

Background:

• The Systolic Blood Pressure Intervention Trial (SPRINT) demonstrated that intensive blood pressure reduction decreased incident acute decompensated heart failure (ADHF) by 36% in older adults.
• Concerns were raised regarding whether this observed benefit was solely due to variations in diuretic medication use between the study arms.

Purpose of the Study:

• To investigate the potential role of differential diuretic drug use in preventing incident ADHF within the SPRINT trial.
• To determine if observed reductions in ADHF were influenced by variations in diuretic prescriptions between the intensive and standard blood pressure treatment groups.

Main Methods:

• Analysis of detailed medication data prospectively collected during the SPRINT trial.
• Examination of ADHF event occurrences in relation to diuretic use and withdrawal.
• Statistical analysis, including hazard ratios and confidence intervals, to assess the impact of diuretic use on ADHF risk.

Main Results:

• ADHF events occurred in 173 out of 9,361 participants.
• Diuretic use increased from screening to baseline in both treatment arms, with a more pronounced rise in the intensive arm.
• Withdrawal of diuretic agents at baseline was infrequent, and ADHF events post-withdrawal were rare, with no significant difference in benefit after excluding these cases. Diuretic use was not found to be a predictor of ADHF.

Conclusions:

• The study found no evidence to support the hypothesis that differential diuretic use accounted for the reduction in new ADHF events observed in the SPRINT trial.
• The significant reduction in ADHF associated with intensive blood pressure management in SPRINT is independent of variations in diuretic medication strategies.