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Holter monitors are not waterproof; patients must avoid bathing, swimming, or hot tubs to prevent device damage. Electrodes must remain in place, and devices must run continuously. Patient compliance ensures uninterrupted data collection.

Normal QRS duration is 0.06–0.10 seconds (1.5–2.5 small boxes at 25 mm/s). A QRS >0.12 seconds indicates bundle branch block or ventricular origin. Narrow QRS suggests supraventricular conduction. Recognizing QRS width is critical in distinguishing supraventricular from ventricular arrhythmias and diagnosing conduction delays. CCTs must measure intervals accurately to provide clinicians with reliable diagnostic data.

A weak battery may fail before the monitoring period ends, leading to incomplete data. Battery issues do not change polarity, artifact, or cause overheating. Checking battery life ensures continuous high-quality data collection.

ST depression is a classic sign of subendocardial ischemia. ST elevation indicates injury, Q waves indicate infarction, and peaked T waves are seen in hyperkalemia. Recognizing ischemic ST changes is crucial during stress testing and resting ECG analysis.

Extended artifact usually results from poor electrode contact or detachment. This creates uninterpretable tracings, often mistaken for arrhythmia. High heart rate produces tachycardia, not artifact. Calibration issues are rare with digital monitors. CCTs should ensure secure electrode placement and patient education to prevent prolonged artifact.