Holter monitoring provides continuous 24–48 hour recording of the heart’s electrical activity to detect irregular heart rhythms that may not appear during a routine ECG. This non-invasive test allows patients to go about their daily activities while wearing a small portable device that tracks heart performance in real time. The collected data helps physicians accurately diagnose arrhythmias, evaluate symptoms such as palpitations or dizziness, and guide appropriate treatment plans for optimal cardiac care.