SA (Sinoatrial) node is the pacemaker of human heart.AV (Atrio-ventricular) node is the conduction junction between Atria and ventricles.It transmits the impulses originating in the SA node (present on right atrium) to the ventricles.Any conductional defects in the AV node may cause ventricular tachyarrhythmias and ventricular failure. In any suspected case of conduction disturbances, the physician must assess The site of block The risk of turning into a complete block The probability that a subsidiary escape rhythm develops distal to the block. If the escape rhythm pace maker is in the HIS bundle, the ectopic impulse is stable and the rate is usually 40 - 60 beats/min.QRS complex is normal in duration. If ectopic rhythm is present in HIS-Purkenjee system, ectopic rhythm is unstable and rate is usually 25 - 45 beats/mins.QRS complex id prolonged. Etiology : Seen in following conditions- Chronic athlets have hypervagal stimulation.Mobitz type two AV conduction block is mostly seen in th...
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