text: There are many causes of<unk><unk> . The most common cause is idiopathic in 50% of cases. The next most common cause is myocarditis  which is responsible for 10% of cases. The high percentage of idiopathic<unk><unk>  may be related to the difficulty in diagnosing viral myocarditis.  Other common causes include substance abuse, connective tissue disease, pregnancy, medications, nutritional deficiencies, infiltrative diseases and toxins.  There are varying degrees of severity of the disease.  Some forms are reversible and some are irreversible; some patients may be completely asymptomatic and some may require cardiac transplantation.
option_0: Dilated cardiomyopathy causes
option_1: Hypertrophic cardiomyopathy causes
option_2: Stress cardiomyopathy causes
option_3: Left ventricular hypertrophy causes
option_4: Left atrial enlargement causes
option_5: Left ventricular aneurysm causes
option_6: ST elevation myocardial infarction causes
option_7: Sick sinus syndrome causes