What ambulatory heart monitor records heart activity during a 24-48 hour period?

• A. Interval
• B. Holter monitor
• C. Cardiac cycle
• D. Depolarization

Answer: (B)

Focusing on ambulatory ECG monitoring over a day or two. A Holter monitor is a small, portable device worn on the body with chest electrodes that continuously records the heart’s electrical activity for about 24 to 48 hours as you go about daily activities. This setup helps detect intermittent rhythm problems or symptoms that a single resting ECG might miss, giving a longer snapshot of how the heart behaves in real life.

The other terms aren’t devices for recording over time: an interval is a measured span on an ECG tracing (like PR or QT intervals), the cardiac cycle is the sequence of events in one heartbeat, and depolarization describes the electrical activation that leads to heart muscle contraction.