Related Experiment Videos
Heart failure with normal ejection fraction. The V-HeFT Study. Veterans Administration Cooperative Study Group
Circulation
|February 1, 1990
Summary
Patients with heart failure and normal ejection fraction, often indicating diastolic dysfunction, have better prognosis than those with low ejection fraction. This highlights distinct heart failure phenotypes and their clinical implications.
Area of Science:
- Cardiology
- Clinical Medicine
- Heart Failure Research
Background:
- Heart failure is often characterized by reduced left ventricular ejection fraction (LVEF).
- However, a subset of patients presents with preserved LVEF, suggesting alternative underlying pathologies like diastolic dysfunction.
- Understanding the characteristics and prognosis of these distinct heart failure phenotypes is crucial for effective management.
Purpose of the Study:
- To investigate the clinical characteristics and prognostic implications of heart failure patients with preserved ejection fraction (≥0.45) compared to those with reduced ejection fraction (<0.45).
- To identify differences in comorbidities, cardiac structure, and exercise capacity between these two groups.
Main Methods:
- Analysis of data from the Veterans Administration Cooperative Study (V-HeFT) trial.
- Baseline radionuclide measurement of left ventricular ejection fraction (LVEF) was used for patient stratification.
- Comparison of demographic, clinical, and echocardiographic parameters between normal LVEF and low LVEF groups.
Main Results:
- Patients with normal LVEF (≥0.45) showed a lower incidence of coronary artery disease and higher incidence of hypertension.
- This group also exhibited higher systolic blood pressure, slower heart rate, smaller cardiothoracic ratio, and smaller left ventricular dimensions.
- Despite slightly better exercise tolerance, the normal LVEF group had a significantly better prognosis with a lower annual mortality rate (8.0% vs. 19.0%).
Conclusions:
- Heart failure patients with preserved ejection fraction represent a distinct clinical entity with different underlying pathologies and a significantly better prognosis.
- Hypertension and diastolic dysfunction are more prevalent in the normal ejection fraction group.
- Ventricular tachycardia and reduced exercise tolerance remain poor prognostic indicators across different LVEF groups.