How many leads are used in a traditional 12-lead ECG?

A traditional 12-lead ECG uses a total of 12 leads to provide a comprehensive view of the heart's electrical activity. These leads include 6 limb leads (I, II, III, aVR, aVL, and aVF) and 6 precordial leads (V1 through V6). Each lead captures the electrical signals from different angles, allowing for an in-depth assessment of the heart's rhythm, the size of the heart chambers, and the presence of any abnormalities. The arrangement of these leads is critical, as it ensures that the entire heart is well-monitored from multiple perspectives, improving the diagnosis and evaluation of cardiovascular conditions. Understanding this aspect is essential for anyone studying or practicing in cardiology or ECG interpretation.