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Diastolic heart failure and diastolic dysfunction refer to the decline in performance of one (usually the left ventricle) or both (left and right) ventricles during diastole. Diastole is the cardiac cycle phase during which the heart is relaxing and filling with incoming blood that is being returned from the body through the inferior (IVC) and superior (SVC) venae cavae to the right atrium and from lungs through pulmonary veins to the left atrium. In diastolic failure, if the patient has symptoms, there is a pathologic cause inducing them. Diastolic dysfunction can be found when doing a Doppler echocardiography in an apparently healthy patient, mainly in an elderly person. ==Causes== Any condition or process that leads to stiffening of the left ventricle can lead to diastolic dysfunction. Causes of left ventricular stiffening include: * A long standing hypertension where, as a result of left ventricular muscle hypertrophy caused by the high pressure, the left ventricle has become stiff. * Aortic stenosis of any cause where the ventricular muscle becomes hypertrophied, and thence stiff, as a result of the increased pressure load placed on it by the stenosis. * Diabetes * Age - elderly patients mainly if they have hypertension. Causes of isolated right ventricular diastolic failure are uncommon. These causes include: * Constrictive pericarditis * Restrictive cardiomyopathy, which includes Amyloidosis (most common restrictive), Sarcoidosis and fibrosis. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Diastolic heart failure」の詳細全文を読む スポンサード リンク
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