QRS complex.
10.18501/arrhythmia.2017.015
- Author:
June Soo KIM
1
Author Information
1. Division of Cardiology, Department of Medicine, Heart Vascular Stroke Institute, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Republic of Korea. juneskim@skku.edu
- Publication Type:Review
- Keywords:
ECG;
Pacemake;
QRS complex;
Heart Rate
- MeSH:
Electrocardiography;
Heart;
Heart Rate
- From:International Journal of Arrhythmia
2017;18(2):96-99
- CountryRepublic of Korea
- Language:Korean
-
Abstract:
The QRS complex is a group of waves in the electrocardiogram (ECG), and represents ventricular activation. It usually consists of three wave forms. The Q wave is an initial negative wave at the onset of the QRS complex. The R wave is the first positive wave in the QRS complex, and appears at the onset of the QRS complex or following a Q wave. The S wave is a second negative wave in the QRS complex. The morphology of the QRS complex is useful in interpreting a 12-lead ECG because it provides clinical information regarding heart rate, QRS axis, heart position, rotation, and abnormal conduction in the ventricles.
