text: On ECG,<unk>  heart disease is characterized by high frequency of low-voltage QRS complexes.
option_0: Carcinoid syndrome electrocardiogram
option_1: Coronary heart disease electrocardiogram
option_2: Carcinoid syndrome echocardiography or ultrasound
option_3: Carotid artery stenosis electrocardiogram
option_4: Chronic obstructive pulmonary disease electrocardiogram
option_5: Coronary angiography left coronary artery
option_6: The chest x-ray in cardiovascular disease
option_7: Sudden cardiac death electrocardiogram