atrial fibrillation
bizarre
cardiac arrhythmia
cardiomyopathy
cardiovascular system
chest pain
doctors office
electrocardiography
exhaustion
factor
fainting
film and television screening
healthcare and medicine
heart internal organ
heart attack
heart disease
human heart
human internal organ
illness prevention
medical instrument
notepaper
out of breath
pen
physical activity
prevention
problems
research
risk
risk factor
stethoscope
stroke illness
sudden death round
surgery
symptom
tired
virus