audio or pulse beat wave

analog analysing art audio background backgrounds beat bright cardiac cardiologist color colorful colour colourful copy curve curves dark diagnosis digital ecg ekg electrical electrocardiogram equipment frequency glowing graph grooved healthcare healthy heart heartbeat hospital human illustration illustrations level medical medicine meter monitor music neon pacemaker pattern pulse rate red rhythm shape shiny sign sound space stability surveillance symbol system technology test trace undulation undulator undulatory vibrant wave waveform waves waving web