An ECG machine that monitors all twelve leads, but records three leads at a time and switches automatically recording each of the four sets of three leads
Input (step 1)
Data enters into an ECG machine through the electrodes on the skin surface
Signal processing (step 2)
The process within the ECG machine that amplifies the electrical impulse and converts it to a mechanical action that appears as a wavefront on the output display
Output display (step 3)
The part of the ECG machine that displays the tracing for the electrical activity of the heart usually in electronic or printed form
Time for PR Interval
PR interval 0.12-0.20 m/s
Time for QRS complex
QRS complex times (0.06-0.10), (0.08-0.10), (0.0—0.11) m/s
Speed Control
A control on the ECG machine that regulates how fast or slow the paper runs during the tracing
Gain control
A control on the ECG machine that increases or decreases the size of the deflection (wave) on the ECG tracing
Artifact filter
unwanted marks on the ECG tracing cause by activity other than the hearts electrical activity
Standard settings
Speed controls: 25 ml/s
Gain: 10 m/v
Artifact filter: range 40-150 Hz
Hertz (Hz): A unit of frequency that indicates cycles or events per second
