The process of studying a current ECG tracing along with older ECGs taken at intervals to note differences in a patient's condition is:

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The process of studying a current ECG tracing along with older ECGs taken at intervals to note differences in a patient's condition is called serial ECG comparison. Multichannel recording refers to the method of recording electrical activity from multiple leads simultaneously. ECG calibration involves adjusting the sensitivity and calibration of the ECG machine. Quality control inspection involves evaluating the accuracy and precision of the ECG machine's readings.

The Process of Studying a Current ECG Tracing Along with Older