What is ventricular depolarization and repolarization?
Ventricular depolarization and activation is represented by the QRS complex, whereas ventricular repolarization (VR) is expressed as the interval from the beginning of the QRS complex to the end of the T wave (QT interval). VR is a complex electrical phenomenon which has been studied in detail[2,3].
What is ventricular depolarization?
Ventricular depolarization occurs in part via an accessory pathway (AP) directly connecting the atrium and ventricle and thus capable of conducting electrical impulses into the ventricle bypassing the AV-His Purkinje conduction system.
What happens ventricular repolarization?
Following ventricular repolarization, the ventricles begin to relax, and pressure within the ventricles drops. When the pressure falls below that of the atria, blood moves from the atria into the ventricles, opening the atrioventricular valves and marking one complete heart cycle.
When does ventricular depolarization occur?
The isoelectric period (ST segment) following the QRS and ending at the beginning of the T wave is the time at which both ventricles are completely depolarized.
Is ventricular depolarization the same as contraction?
QRS Complex Ventricular depolarization will lead to ventricular contraction and the start of systole. Remember that systole is the cardiac phase in which the heart, especially the ventricles, contracts to move blood forward into the pulmonary artery and aorta.
Is ventricular depolarization contraction?
The ventricles contract due to the ventricular depolarization and the pressure inside the ventricles rapidly increases. Immediately after a ventricular contraction begins, the pressure in the ventricles exceeds the pressure in the atria and thus the atrioventricular valves shut.
What reflects ventricular depolarization and atrial repolarization?
Atrial depolarization is reflected by the P wave, and ventricular depolarization is reflected by the QRS complex, whereas the T wave reflects ventricular repolarization, see Figure 6.10. Atrial repolarization cannot usually be discerned from the ECG since it coincides with the much larger QRS complex.
Does ventricular repolarization mean relaxation?
T wave
On the ECG, the QRS waveform represents ventricular electrical depolarization that initiates ventricular contraction and ejects the blood out of the ventricles, whereas the T wave represents ventricular electrical repolarization that is associated with ventricular relaxation that allows blood to fill the ventricular …
What wave is ventricular repolarization?
The T wave on the ECG (T-ECG) represents repolarization of the ventricular myocardium.