QRS complex
ventricular depolarization and atrial repolarization
The QRS complex is an important feature of the electrocardiogram (ECG) waveform. It is the part of the ECG that reflects the electrical activity occurring during ventricular depolarization, which is the initiation of the contraction of the lower chambers of the heart called the ventricles.
The QRS complex is made up of three distinct waves: the Q, R, and S waves. The Q wave is the first negative deflection after the P wave, which reflects the atrial depolarization. The R wave is the first positive deflection after the Q wave, and the S wave is the first negative deflection after the R wave.
The duration of the QRS complex reflects the time it takes for the ventricles to depolarize, and can provide information about the overall function of the heart’s electrical system. A normal QRS duration is usually less than 0.12 seconds (120 milliseconds). A prolonged QRS duration can indicate a block in the electrical conduction system, which can lead to abnormal heart rhythms and heart failure.
Overall, the QRS complex is an important feature of the ECG waveform and provides clinicians with valuable information about the function of the heart’s electrical system.
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