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The association between high-dose diuretics and clinical stability in ambulatory chronic heart failure patients
Lisa M Mielniczuk1, Sui W Tsang, Akshay S Desai
1Cardiovascular Division, Brigham and Women's Hospital, Harvard Medical School, Boston, Massachusetts 02115, USA.
Insights
High-dose diuretics in heart failure (HF) may indicate instability rather than cause it. Maintaining HF stability for six months significantly lowers the risk of future HF events, regardless of diuretic dosage.
Area of Science:
- Cardiology
- Pharmacology
- Clinical Medicine
Background:
- Diuretic doses often increase in chronic heart failure (HF) as the disease progresses.
- Increased diuretic use is linked to worsening renal function and mortality in HF patients.
- Hospitalization for instability frequently precedes escalated diuretic therapy.
Purpose of the Study:
- To investigate the relationship between diuretic dose and adverse events in advanced heart failure.
- To determine if high-dose diuretics are a cause or a marker of instability.
- To assess the impact of clinical stability on future HF events.
Main Methods:
- Prospective observational analysis of 183 advanced HF patients.
- Stratification at baseline by diuretic dose (low: <= 80 mg, high: > 80 mg furosemide equivalent).
- 1-year follow-up for combined HF events (admission, transplant, mechanical support, or death).
Main Results:
- Patients on high-dose diuretics (n=70) exhibited more cardiovascular risk markers and recent instability history (33% vs 4.4%) compared to low-dose (n=113).
- High-dose diuretics were a univariate predictor of HF events (HR 3.83).
- After adjusting for clinical stability, diuretic dose was no longer significant (HR 1.53).
Conclusions:
- High-dose diuretic use may be a marker, not a direct cause, of HF instability.
- A history of HF stability in the prior 6 months independently predicts an 80% lower risk of HF events in the subsequent year.
Objective:
In chronic heart failure (HF), diuretic doses increase as the disease progresses, often after hospitalization for instability, and have been associated with worsening renal function and increased mortality.
Methods And Results:
A prospective observational analysis of 183 patients in an advanced HF clinic stratified at baseline by diuretic dose (low dose < or = 80 mg, high dose > 80 mg furosemide equivalent) was performed. All patients were followed for 1 year, and the primary outcome was a combined HF event of admission for HF, cardiac transplant, mechanical cardiac support, or death. Compared with patients taking low-dose diuretics (n = 113), patients taking high-dose diuretics (n = 70) had more markers of increased cardiovascular risk and were more likely to have a history of recent instability (33% vs 4.4% in low dose, P < .001). High doses of diuretics were a strong univariate predictor of subsequent HF events (hazard ratio 3.83, 95% confidence interval 1.82-8.54); however, after adjustment for clinical stability, diuretic dose no longer remained significant (hazard ratio 1.53, 95% confidence interval 0.58-4.03).
Conclusion:
High-dose diuretics may be more of a marker than a cause of instability. A history of HF stability during the past 6 months is associated with an 80% lower risk of an HF event during the next year, independently of baseline diuretic dose.
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