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Mechanisms and management of heart failure due to diastolic dysfunction
P Ruzumna1, M Gheorghiade, R O Bonow
1Division of Cardiology, Northwestern University, Medical School, Chicago, IL 60611, USA.
Insights
Diastolic heart failure, characterized by impaired left ventricular filling, affects many patients with chronic heart failure. Current therapies manage symptoms but lack proven long-term prognostic benefits, necessitating further research.
Area of Science:
- Cardiology
- Heart Failure Research
Background:
- A subset of chronic heart failure patients exhibit preserved systolic function.
- Their symptoms stem from left ventricular diastolic abnormalities, not impaired contractility.
Purpose of the Study:
- To summarize the understanding of diastolic heart failure, including its pathophysiology, therapeutic approaches, and the need for further investigation.
Main Methods:
- Review of existing literature on diastolic heart failure.
- Analysis of factors contributing to impaired diastolic filling.
- Evaluation of current therapeutic strategies and their limitations.
Main Results:
- Diastolic heart failure involves impaired left ventricular filling due to passive elastic property abnormalities and/or impaired active relaxation.
- Therapies focus on reducing hypertrophy, managing hypertension, and lowering filling pressures.
- Current medications may improve symptoms but have limited evidence for improving prognosis.
Conclusions:
- Diastolic heart failure is a distinct clinical entity requiring further study.
- More research is needed to determine prevalence, clinical characteristics, prognosis, and optimal therapeutic responses.
Abstract:
A significant subset of patients with chronic heart failure have preserved systolic function and their symptoms are attributable to left ventricular diastolic abnormalities. In the setting of diastolic heart failure, the cardiac chambers are nondilated and have normal contractility, but left ventricular filling is impaired. This impairment in diastolic filling is related to both abnormalities of the passive elastic properties of the ventricle and impaired active relaxation as a result of any of the following: myocardial ischemia, hypertrophy, reduced beta-adrenergic tone, or increases in myocardial connective tissue. Therapy of diastolic heart failure is aimed at preventing and reducing left ventricular hypertrophy, treating elevated blood pressure, and reducing left ventricular filling pressure without reducing cardiac output. This may be achieved by maintaining sinus rhythm, slowing heart rate, and treating ischemia. Although calcium-channel blockers, beta-blockers, angiotensin-converting enzyme inhibitors, diuretics, and nitrates may improve symptoms in patients with diastolic heart failure, there are few data to indicate that these agents have an important effect on prognosis. Further studies of patients with diastolic heart failure are needed to assess its prevalence, clinical characteristics, prognosis, and response to therapy.