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Motion artifact is the most common issue during ambulatory monitoring, caused by physical activity, poor lead adhesion, or loose wires. It produces erratic baseline fluctuations and mimics arrhythmias, complicating interpretation. Baseline wander occurs but is more frequent during resting ECGs when breathing is exaggerated. AC interference is less common outside hospital environments. Electrode pop occurs when contact is lost briefly but is less frequent than motion-related artifact. Patient education (proper electrode care, minimizing lead tugging) and secure attachment reduce motion artifacts and enhance Holter data reliability.

The T wave reflects ventricular repolarization. Abnormalities may indicate ischemia, electrolyte imbalances, or drug effects. P wave = atrial depolarization, QRS = ventricular depolarization, and U wave = delayed Purkinje repolarization (not always present). Accurate interpretation of T wave morphology is vital for diagnosing ischemia and monitoring treatment effects.

Lead aVR typically shows negative P waves, QRS complexes, and T waves because it views the heart from the right shoulder, opposite to the mean electrical axis. This negative deflection is normal and expected. Lead II usually shows upright waves, as does V5. Lead III varies but is often positive. Recognizing expected lead patterns prevents mislabeling normal findings as abnormal. CCTs must understand axis orientation and normal lead appearance to interpret ECGs accurately.

Third-degree (complete) AV block occurs when atrial impulses fail to conduct to the ventricles entirely. The atria and ventricles beat independently, often with slow ventricular escape rhythms. Unlike Mobitz I and II, there is no relationship between P waves and QRS complexes. First-degree block shows prolonged PR, not dissociation. Junctional rhythm is narrow-complex with absent or inverted P waves, not AV dissociation. Recognizing complete heart block is critical, as patients often require pacing due to risk of syncope or sudden death.

Patients should press the event marker button if available and record symptoms, time, and activity in their diary. This allows precise correlation between symptoms and ECG tracings. Holter monitors do record automatically, but symptom correlation improves diagnostic accuracy. Removing the monitor interrupts recording. Contacting manufacturers is unnecessary. Patient instruction ensures high-quality data for provider review.