assistance
cardiac conduction system
cardiac massage
cardiac resuscitation
chest
chest wall
cpr
death
doctor
emergency services
first aid
healthcare and medicine
healthcare worker
heart attack
human cardiopulmonary system
human hand
human heart
illness
instructor
life
lifeguard
massaging
medical equipment
medical exam
medical occupation
medical procedure
paramedic
patient
physical pressure
practicing
pushing
rescue
shock
showing
skill
teaching
training
urgency