How many electrodes are typically used in a 12-lead EKG?

In a 12-lead EKG, the typical number of electrodes used is 10. This includes 6 precordial (chest) electrodes placed on the thorax and 4 limb electrodes placed on the arms and legs. The arrangement of these electrodes allows for the recording of electrical activity from multiple angles of the heart, leading to the creation of 12 distinct leads. The combination of these leads is essential for diagnosing various cardiac conditions. While the name “12-lead EKG” indicates that 12 different views are obtained, it does not mean that 12 electrodes are used; rather, the configuration of the electrodes generates those 12 leads for comprehensive heart monitoring.