<unk><unk>  arrest  may be caused by underlying<unk>  abnormality including coronary artery abnormality , hypertrophy of myocardium, myocardial disease
,valvular heart disease 
, congenital heart disease 
, abnormality in conducting system 
, electrical instability.
Sudden cardiac death causes
Myocardial rupture risk factors
Farmer's lung risk factors
Sudden infant death syndrome causes
Air embolism risk factors
Syncope causes
Pulmonary embolism risk factors
Cardiomyopathy causes