what are some of the causes of systolic heart failure?
['Coronary artery disease.', 'Diabetes mellitus.', 'Hypertension.', 'Valvular heart disease (stenosis or regurgitant lesions)', 'Arrhythmia (supraventricular or ventricular)', 'Infections and inflammation (myocarditis)', 'Peripartum cardiomyopathy.', 'Congenital heart disease.']