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Clinical determinants of mortality in patients with angiographically diagnosed ischemic or nonischemic cardiomyopathy
B A Bart1, L K Shaw, C B McCants
1Department of Medicine (Cardiology), Duke University Medical Center, Durham, North Carolina, USA.
Insights
Ischemic cardiomyopathy is a significant predictor of mortality in heart failure patients. However, the extent of coronary artery disease provides more prognostic information than the etiology itself.
Area of Science:
- Cardiology
- Clinical Medicine
- Heart Failure Research
Background:
- Ischemic cardiomyopathy may confer a worse prognosis than nonischemic cardiomyopathy.
- Limited research exists on the comparative impact of ischemic versus nonischemic etiology on patient outcomes.
- Understanding these differences is crucial for accurate prognostication and treatment strategies.
Purpose of the Study:
- To identify clinical factors predicting mortality in patients diagnosed with ischemic or nonischemic cardiomyopathy.
- To compare the prognostic value of ischemic versus nonischemic cardiomyopathy etiology.
- To investigate the role of coronary artery disease extent in predicting outcomes.
Main Methods:
- Analysis of prospectively collected data from 3,787 patients with left ventricular ejection fraction ≤40% undergoing coronary angiography.
- Classification of patients into ischemic cardiomyopathy (n=3,112) based on history of myocardial infarction, revascularization, or significant coronary stenosis (>75%).
- Classification of remaining patients (n=675) as nonischemic cardiomyopathy.
Main Results:
- Ischemic etiology was an independent predictor of 5-year mortality after adjusting for clinical risk factors (p < 0.0001).
- The extent of coronary artery disease demonstrated a stronger predictive value for survival compared to the etiological classification (ischemic vs. nonischemic).
- Median age, ejection fraction, and NYHA class III/IV symptoms differed between groups, with ischemic patients being older and having lower ejection fractions.
Conclusions:
- Ischemic etiology is a significant independent predictor of mortality in cardiomyopathy patients.
- The extent of coronary artery disease provides more prognostic information than the clinical diagnosis of ischemic or nonischemic cardiomyopathy.
- Further research is needed to refine the definition of ischemic cardiomyopathy for improved treatment and outcome prediction.
Objectives:
We sought to characterize the clinical determinants of mortality in patients with angiographically diagnosed ischemic or nonischemic cardiomyopathy.
Background:
Patients with ischemic cardiomyopathy may have a worse prognosis than patients with nonischemic cardiomyopathy. Few studies have assessed the effect of ischemic versus nonischemic etiology on outcomes.
Methods:
We analyzed prospectively collected data on 3,787 patients with a left ventricular ejection fraction < or = 40% who underwent coronary angiography. Patients were considered to have ischemic cardiomyopathy (n = 3,112) if they had a history of myocardial infarction, percutaneous transluminal coronary angioplasty, coronary artery bypass graft surgery or at least one major epicardial coronary artery with > or = 75% stenosis; all others were considered to have nonischemic cardiomyopathy (n = 675).
Results:
The median age, ejection fraction and proportion of patients with New York Heart Association functional class III or IV symptoms for the nonischemic and ischemic groups were 55 years versus 63 years, 27% versus 32% and 57% versus 25%, respectively. After adjustment for baseline clinical risk factors and presenting characteristics, ischemic etiology remained an important independent predictor of 5-year mortality (p < 0.0001). The extent of coronary artery disease was a better predictor of survival than ischemic or nonischemic etiology (log likelihood chi-square 700 vs. 675, respectively).
Conclusions:
Ischemic etiology is a significant independent predictor of mortality in patients with cardiomyopathy. However, the extent of coronary artery disease contributes more prognostic information than the clinical diagnosis of ischemic or nonischemic cardiomyopathy. Further research is needed to refine the clinical definition of ischemic cardiomyopathy so that physicians can appropriately prescribe treatment and accurately predict outcome.