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conduction tissue, normal sinus rhythm, precordial lead, sino-atrial block, first degree heart block, second degree heart block, complete heart block,
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Dr. Md.Toufiqur Rahman MBBS, FCPS, MD, FACC, FESC, FRCP,
FSCAI, FAPSIC, FAPSC
Associate Professor of CardiologyNational Institute of Cardiovascular Diseases
Sher-e-Bangla Nagar, Dhaka-1207
Dr. Md.Toufiqur Rahman MBBS, FCPS, MD,FACC, FESC, FRCP, FSCAI, FAPSIC, FAPSC
Conduction Tissue
Normal Rhythm ECG
Leads of ECG
Precordial Leads
Pathology of conduction tissue
Sinoatrial block
• Sinus rhythm for three beats, then a 'sinus pause'• P waves arrowed• The expected P wave is not seen, but the SA node must have beendepolarized because the next P wave appears at the predicted time
First degree block
• Sinus rhythm• PR interval is constant (360 ms)
Second degree block (Mobitz type 2)
• Sinus rhythm with a normal PR interval• One P wave (arrowed) is not followed by a QRS complex
Second degree block (Wenckebach)
• Three beats with progressively longer PR intervals are followed by a non-conducted P wave (arrowed)• The next PR interval is short, but this is followed by a longer PR interval and then another non-conducted beat
Second degree block (2:1)
• The conducted beats have a normal PR interval• Alternate P waves are not followed by a QRS complex;
Complete (third degree) block
• No relationship between P waves (arrowed) and QRS complexes• The QRS complexes are normal, indicating that the origin of ventricular depolarization is within the His bundle• The ventricular rate is 30/min
Complete (third Degree) block
• No relationship between P waves (arrowed) and QRS complexes• Wide QRS complexes• Ventricular rate of 22/min
Thank You All