Holter monitoring is best described as which of the following?

• A. 24-hour continuous ECG recording w/events
• B. 24-hour continuous EEG recording
• C. Imaging of the heart
• D. Blood pressure monitoring only

Answer: (A)

Holter monitoring measures the heart’s electrical activity over an extended period using a portable device worn by the patient. It records a continuous ECG for about 24 hours, which lets clinicians detect infrequent or transient arrhythmias and correlate symptoms with rhythm changes that a single resting ECG might miss. The “events” aspect refers to patient-activated symptom recording or automatic detection of abnormal rhythms, helping link clinical events to specific ECG changes. This is not about brain activity (EEG), heart imaging (like echocardiography or MRI), or blood pressure monitoring, all of which assess different physiology.