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Diastolic dysfunction in aortic stenosis
O M Hess1, B Villari, H P Krayenbuehl
1Department of Internal Medicine, University Hospital, Zurich, Switzerland.
Insights
Diastolic dysfunction, a condition of impaired heart relaxation, is common in aortic stenosis patients. Early detection and treatment, often via aortic valve replacement, improve outcomes compared to systolic dysfunction.
Area of Science:
- Cardiology
- Cardiovascular Physiology
Background:
- Diastolic dysfunction involves impaired left ventricular filling and increased filling pressures.
- It is associated with myocardial changes like hypertrophy, fibrosis, and infiltrative processes.
- Left ventricular hypertrophy is a primary cause of diastolic dysfunction in aortic stenosis.
Purpose of the Study:
- To investigate the prevalence and significance of diastolic dysfunction in aortic stenosis.
- To explore the relationship between diastolic dysfunction and systolic function in these patients.
- To discuss treatment strategies and prognostic implications of diastolic dysfunction in aortic stenosis.
Main Methods:
- Review of existing literature on diastolic dysfunction and aortic stenosis.
- Analysis of patient data regarding diastolic function, systolic function, and clinical outcomes.
- Echocardiographic assessment of left ventricular structure and function.
Main Results:
- Diastolic dysfunction occurs in 50% of patients with normal systolic function and 100% with depressed function.
- Diastolic dysfunction may be a more sensitive or earlier indicator of left ventricular abnormality than systolic dysfunction in aortic stenosis.
- Aortic valve replacement can lead to regression of left ventricular hypertrophy and improvement in diastolic function.
Conclusions:
- Diastolic dysfunction is a significant finding in aortic stenosis, often preceding or accompanying systolic dysfunction.
- Treatment, primarily aortic valve replacement, can reverse cardiac remodeling and improve diastolic function.
- Prognosis is generally better than for systolic dysfunction but worse than for normal cardiac function.
Abstract:
Diastolic dysfunction is characterized by an increased resistance to filling with increased diastolic filling pressures. A variety of disorders are associated with diastolic dysfunction, such as hypertrophy, structural alterations of the myocardium with increased fibrosis, myocardial scarring, or infiltrative processes. In addition to these changes, physiological abnormalities of the left ventricle with impaired relaxation, decreased diastolic filling, and increased stiffness of the myocardium can be observed. In patients with aortic stenosis, the most common cause for diastolic dysfunction is left ventricular hypertrophy. Diastolic dysfunction is found in approximately 50% of the patients with normal systolic ejection performance and in 100% of the patients with depressed function. Diastolic function appears either to be more sensitive for detection of abnormal left ventricular function in patients with aortic stenosis or to precede systolic dysfunction or both. Treatment of diastolic dysfunction is usually achieved by aortic valve replacement with regression of left ventricular hypertrophy, but in patients with decompensated aortic stenosis, a reduction of circulating blood volume to reduce diastolic filling pressures, and thus dyspnea, is often indicated. Prognosis of patients with diastolic dysfunction is usually better than that of patients with systolic dysfunction but is clearly worse than that of normal patients.