Note that right-sided ECGs and posterior ECGs can be helpful and are described elsewhere. The T wave comes after the QRS complex and indicates ventricular repolarization. The QRS complex consists of a Q wave, R wave and S wave and represents ventricular depolarization. The P wave indicates atrial depolarization. Each will be explained individually in this tutorial, as will each segment and interval. The main part of an ECG contains a P wave, QRS complex and T wave. Point:В There is only one point on an ECG termed the J point, which is where the QRS complex ends and the ST segment begins. If we want to find the way back to ourselves and one another, we need language and the grounded confidence to both tell our stories and to be stewards of. 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.Д¬omplex:В The combination of multiple waves grouped together. Segment:В 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:В 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:В 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.ДЄВ normal ECGВ contains waves, intervals, segments and one complex, as defined below. The six precordial leads are called leads V1, V2, V3, V4, V5 and V6.Д«elow is a normal 12-lead ECG tracing. The letter вЂњaвЂќ stands for вЂњaugmented,вЂќ 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 вЂњprecordial leadsвЂќ because they are placed on the torso (precordium). Six of the leads are considered вЂњlimb leadsвЂќ 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.

Where the heart leads online