The causes of<unk>  may be classified as congenital or acquired; another classification divides the causes into primary or secondary. Congenital abnormalities are much less common than acquired. The most common acquired<unk>  is due to right ventricular dilatation. Such dilatation is most often due left heart failure or pulmonary hypertension. Other causes of right ventricular dilatation include right ventricular infarction, inferior myocardial infarction, and cor pulmonale. In regards to primary and secondary causes they are:
Tricuspid regurgitation
Aortic regurgitation
Mitral regurgitation
Mitral stenosis
Tricuspid valve stenosis
Aortic stenosis
Mitral valve prolapse
Pulmonary valve stenosis