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Relation of arrhythmias and electrolyte abnormalities to survival in patients with severe chronic heart failure
Insights
In chronic heart failure patients, frequent ventricular extrasystoles are the primary predictor of mortality. Sudden cardiac death is common, and arrhythmias stem from complex factors beyond electrolyte imbalances.
Area of Science:
- Cardiology
- Internal Medicine
- Clinical Research
Background:
- Chronic heart failure (CHF) is a major cause of mortality.
- Sudden cardiac death is a significant concern in CHF patients.
- Identifying predictors of mortality is crucial for patient management.
Purpose of the Study:
- To identify key determinants of mortality in patients with chronic heart failure.
- To explore the relationship between baseline characteristics and long-term outcomes.
- To investigate the prognostic value of ventricular arrhythmias and electrolyte abnormalities.
Main Methods:
- Prospective evaluation of 84 patients with chronic heart failure.
- Detailed biochemical, clinical, and functional assessments at baseline.
- Follow-up for 12 to 52 months to record mortality events.
Main Results:
- 58% of patients died during follow-up, with 71% of deaths being sudden.
- Ventricular extrasystoles frequency was the strongest predictor of mortality.
- Echocardiographic fractional shortening, coronary artery disease, and exercise duration also predicted mortality.
- Hypokalemia and hyponatremia were associated with poor prognosis but not independent predictors.
- Ventricular arrhythmias correlated with left ventricular dysfunction and exercise intolerance.
Conclusions:
- Ventricular extrasystoles are a critical predictor of mortality in chronic heart failure.
- Sudden cardiac death is prevalent and multifactorial in origin.
- Arrhythmias in CHF are complex, influenced by ventricular dysfunction and neurohormonal factors, not solely electrolyte imbalances.
Abstract:
To investigate the determinants of mortality in patients with chronic congestive heart failure, we prospectively evaluated 84 patients with this disorder who underwent detailed biochemical, clinical, and functional tests at the time of initial evaluation and were then followed for 12 to 52 months (mean 31). During this period of follow-up, 58% of the patients died, of whom 71% died suddenly. The most important pretreatment predictor of mortality in these patients was the frequency of ventricular extrasystoles, followed by echocardiographic fractional shortening, a diagnosis of coronary artery disease, and duration of treadmill exercise. The finding of hypokalemia and hyponatremia in these patients at the time of entry into the study was associated with a poor prognosis by univariate analytical methods, but these electrolyte abnormalities did not provide independent prognostic information. The presence of ventricular arrhythmias was related to the severity of left ventricular dysfunction, exercise intolerance, and neurohormonal activation, suggesting that such arrhythmias are multifactorial in origin and may not simply be related to electrolyte abnormalities.