The QRS complex is a record of the measurement of the movement of electrical impulses through the lower heart chambers (ventricles).

Electrocardiography (EKG, ECG) tracings show a characteristic pattern of electrical impulses that are generated by the heart. The different parts of an EKG tracing of a heartbeat are called the P wave, the ST segment, and the T wave, and the QRS complex mentioned above.

The P wave is a record of the movement of electrical activity through the upper heart chambers (Atrium anatomyatria).

The ST segment usually appears as a straight, level line between the QRS complex and the T wave. Elevated or depressed ST segments may mean the heart muscle is damaged or not receiving enough blood, a sign that a myocardial infarction may have occurred. However, this is not considered a reliable method of diagnosis, and is often interpreted as being non-specific.

The T wave corresponds to the period when the lower heart chambers are relaxing electrically and preparing for their next muscle contraction.

Cardiology | Zespół QRS