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ac pickup adjusted alarm applied arrhythmias artifact atrial atrium baseline battery beats per minute bedside binary number bioelectronics bioelectronics specialist Block diagram blood button calibrated cardiac cardiac cycle cardiotachometer catheter cathode-ray tube central station chart paper circuit connected current flow cycle defibrillator deflection device display ECG amplifier ECG machine ECG signal ECG voltage ECG waveform elec electrical electrocardiogram electronic instruments employed equipment example fetal heart rate fuse ground wire hazard heart rate heart sounds heart-rate monitor hertz illustrated in Fig input leakage current Medtronic metal meter microphone microshock millimeters monitor oscilloscope node normal one-millivolt operation oscillator pacemaker pacer paddle paper speed patient cable permit phonocardiogram position power cord power plug pressure produce pushbutton recording right atrium screen sensitivity control shown in Fig stopcock strip chart stylus subcarrier sweep switch synchronized tape technique telemetry tion trace transducer transmitter tube typically variations ventricles ventricular voltage wall outlet wave