Cardiology revision from final exam 2025!

What is a PJC

An extra QRS complex that originates from the AV junction that occurs earlier than expected.

P waves may be normal or inverted

There will be a non compensatory pause

Are PJC clinically significant

If isolated no. If there is more than 4-6/min enhanced automaticity or re-entry in the AV node

What is a junctional escape rhythm

The SA node is failing and the AV node is taking over as pace maker at 40-60bpm

What is a nonparoxysmal junctional tachycardia

The AV node is the orgin at 60-140 bpm

What is paroxysmal supraventricular tachycardia

abrupt beginning of a rate from the AV node 150-250bpm

What is the identifying factor of a junctional rhythm

an abnormal P wave that indicates atrial depolarization was retrograde. This P wave may be hidden in QRS or ST

What is the difference between a PJC and a junctional rhythm

PJC is a single complex; the other is when the AV junction pacemaker is firing

What are accelerated junction rhythm and junctional tachycardia examples of

non-paroxysmal junctional tachycardia

What casues non-paroxysmal junctional tachycardia

Increased automaticity of the AV node

Where and how does paroxysmal SVT ordinate

accessory or reentry pathway, abruptly