Pacemaker
What is Pacemaker Pacemaker is an artificial device used to electrically stimulate the heart. It is composed of two parts: • Battery-powered generator. • Wire electrode—which is attached to the…
Left Bundle Branch Block (LBBB)
ECG Criteria of LBBB • RSR´- in V5 and V6, also in L1 and aVL (M pattern). • QRS wide, >0.12 second (3 small squares). Causes of LBBB • Severe…
Right Bundle Branch Block (RBBB)
What is RBBB The full terms of RBBB is Right Bundle Branch Block ECG Criteria • RSR—in V1 and V2 (M pattern). • QRS—wide, >0.12 second (3 small squares). Causes…
Complete Heart Block
What is Complete Heart Block No impulse from atria transmitted to the ventricles. So, ventricles generate their own rhythm. Causes of Complete Heart Block (CHB) 1. Acute CHB—Acute MI (commonly…
Second Degree AV Block
What is Second Degree AV Block Types It is of 3 types: • Mobitz type I (Wenckebach’s phenomenon). • Mobitz type II. • 2 : 1 or 3 : 1…
First Degree AV Block
What is First Degree AV Block It is the prolongation of PR >0.22 sec. Every atrial depolarisation is followed by conduction to the ventricles, but with delay. Causes of First…
SA Block (Sinoatrial Block)
What is SA Block Failure to inititate an impulse from SA node. Causes of SA Block • Degenerative changes in elderly. • Ischaemic heart disease (involving SA node). • Drugs…
Heart Block
Definition of Heart Block It is defined as defect in either initiation or conduction of cardiac impulse. Sites of Heart Block • SA node. • AV node. • Bundle of…