Which of the following represents one of the three types of leads in ECG?

The correct answer, which is bipolar leads, is vital in the context of the electrocardiogram (ECG) as it relates to how electrical activity of the heart is recorded. Bipolar leads consist of two electrodes — one positive and one negative — positioned in different locations on the body. This configuration allows for the measurement of the heart’s electrical activity from various angles, resulting in a comprehensive view of cardiac function.

In standard 12-lead ECG configurations, the bipolar leads are specifically known as Leads I, II, and III. Each of these leads provides unique insights into the heart’s electrical activity by capturing the differences in electrical potential between the two electrodes, which helps in diagnosing various cardiac conditions.

Other options presented, such as digital, quadrant, and compound leads, do not represent commonly recognized types of leads in ECG terminology. Digital leads is not a standard type found in ECG practice. Quadrant leads and compound leads do not exist as formal classifications in standard cardiology practice. Understanding the role of bipolar leads as part of the traditional ECG lead system is essential for proper interpretation and assessment of cardiac health.