Types of ECG machines
1. single-channel recorder monitors all 12 leads individually 2. multi-channel recorder monitors all 12 leads at the same time but records three leads at once and switches automatically, recording each of the four sets of three leads
Functions of ECG machines
input, signal processing, and output display
electrodes on patient's skin direct impulses to the ECG instrument
amplification of electrical impulse and conversion into mechanical actions on the display
printed report or computerized data report
Other functions of ECG machines
computerized measurement and analysis; storage and communication
Controls on ECG machines
speed, gain, and artifact filter
regulates output or height of ECG waveform
reduces artifact or abnormal marks on printed output
ECG graph paper
standard grid and dot matrix
Heart rate limits
The operator can set heart rate that machine will interpret as too slow (bradycardia) or too fast (tachycardia). If heart rate is above or below number set, machine will sound an alarm and mark on the tracing.
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