ecg. sinusoidal pulse lines, frequency heartbeat stress testing life, monitor with signal graphic pulsing, cardiogram

abstract arrhythmias beat blood bradycardia cardiac cardio cardiogram cardiograph cardiology care chart concept curves death diagnosis display ecg electrocardiogram frequency graphic graphs health healthy heart heartbeat hospital irregular life lines logo medical medicine monitor normal pulsating pulse pulsing rate rhythm screen set sign signal sinusoidal stress symbol testing vector wave