Sinus Node Rhythms and Arrhythmias: Difference between revisions

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[[Image:conduction_system_en.png|thumb|The conduction system handles the spreading of an electrical signal through the heart. The normal sinus rhythm begins in the sinus node and goes via the AV node to the His bundle where it splits via the right and left bundle branch.]]

[[Image:PQRS_origin_en.png|thumb| During normal sinus rhythm, every atrial contraction (P-wave) is followed by a ventricular contraction (QRS complex).]]

[[Image:normalSR.jpg|thumb|Normal sinus rhythm with a positive P-wave in I, II and AVF, and a biphasic P-wave in V1.]]

The normal heart rhythm is ''sinus rhythm''. That means that the rhythm has its origin in the sinus node, the heart's fastest physiological impulse generator.

The sinus node (SA) is located in the upper part of the wall of the right atrium. When the sinus node generates an electrical impulse, first the cells of the right atrium depolarise, then the cells of the left atrium, the AV (atrioventricular) node follows and at last the ventricles are stimulated via the His bundle.