What is the primary use of a Holter monitor?

• A. To monitor blood pressure
• B. To perform a cardiac stress test
• C. To continuously record a patient's ECG over 24-48 hours
• D. To visualize coronary arteries

Answer: (C)

The primary use of a Holter monitor is to continuously record a patient's ECG over 24-48 hours. This portable device captures the heart's electrical activity throughout an entire day or more, providing valuable information about the heart's rhythm during regular daily activities. This continuous monitoring is particularly useful for diagnosing arrhythmias, evaluating the effectiveness of medications, and understanding the correlation between symptoms and heart activity.

In contrast, monitoring blood pressure relates to vascular health rather than the electrical activity of the heart, which is why a Holter monitor is not suitable for that purpose. A cardiac stress test assesses how the heart performs under physical stress but does not provide continuous ECG data over an extended period. Visualizing coronary arteries typically involves imaging techniques such as angiography, which is unrelated to the function of a Holter monitor. This focused recording capacity makes the Holter monitor an essential tool in cardiology for assessing abnormal heart rhythms that may not be evident during a standard ECG performed in a clinical setting.