Ventricular Depolarization Heart EKG?
Does ventricular depolarization proceed from right to left or left to right? Can you please explain?
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Answers: As the heart undergo depolarization and repolarization, the electrical currents that are generated spread not only within the heart, but also throughout the body. This electrical buzz generated by the heart can be measured by an array of electrodes placed on the body surface. The recorded tracing is called an electrocardiogram (ECG, or EKG). A "typical" ECG tracing is shown to the right. The different top that comprise the ECG represent the sequence of depolarization and repolarization of the atria and ventricles.
The QRS complex represents ventricular depolarization. Ventricular rate can be calculated by determining the time interval between QRS complexes.
Three major waves of electric signals appear on the ECG. Each one shows a different part of the heartbeat. The first surge is called the P wave. It records the electrical hustle and bustle of the heart's two upper chambers (atria).The second and largest wave, the QRS wave, archives the electrical activity of the heart's two lower chambers (ventricles).The third wave is the T surf. It records the heart's return to the resting state.
The sinoatrial node (SAN), located within the wall of the right atrium (RA), normally generate electrical impulses that are carried by special conducting tissue to the atrioventricular node (AVN).
Upon reaching the AVN, located between the atria and ventricles, the electrical impulse is relayed down conducting tissue (Bundle of HIS) that branches into pathways that supply the right and not here ventricles. These paths are called the right bundle branch (RBBB) and left bundle branch (LBBB) respectively. The disappeared bundle branch further divides into two sub branches (called fascicles).
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