![]() ![]() ![]() Point: There is only one point on an ECG termed the J point, which is where the QRS complex ends and the ST segment begins. The only main complex on an ECG is the QRS complex. The segments on an ECG include the PR segment, ST segment and TP segment.Ĭomplex: The combination of multiple waves grouped together. Segment: The length between two specific points on an ECG that are supposed to be at the baseline amplitude (not negative or positive). The intervals commonly measured on an ECG include the PR interval, QRS interval (also called QRS duration), QT interval and RR interval. Interval: The time between two specific ECG events. The waves on an ECG include the P wave, Q wave, R wave, S wave, T wave and U wave. Wave: A positive or negative deflection from baseline that indicates a specific electrical event. The different parts of the ECG will be described in the following sections.Ī normal ECG contains waves, intervals, segments and one complex, as defined below. The six precordial leads are called leads V1, V2, V3, V4, V5 and V6.īelow is a normal 12-lead ECG tracing. ![]() The letter “a” stands for “augmented,” as these leads are calculated as a combination of leads I, II and III. The six limb leads are called lead I, II, III, aVL, aVR and aVF. The other six leads are considered “precordial leads” because they are placed on the torso (precordium). Six of the leads are considered “limb leads” because they are placed on the arms and/or legs of the individual. This tutorial pairs the approaches, as basing ECG interpretation on pattern recognition alone is often not sufficient. There are two ways to learn ECG interpretation - pattern recognition (the most common) and understanding the exact electrical vectors recorded by an ECG as they relate to cardiac electrophysiology - and most people learn a combination of both. By examining changes from normal on the ECG, clinicians can identify a multitude of cardiac disease processes. An electrocardiogram is a picture of the electrical conduction of the heart. ![]()
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