1. 3rd Degree Block
Rate: Atrial rate > Ventricular rate
Rhythm: Atrial Regular, Ventricular regular. There is no relationship between the P-wave & QRS complexes
P waves: Normal in Size & Shape
PR interval: NA
QRS: Usually Wide (> 0.12 sec) if the block is below the His junction.
2. 1st Degree Block
Rate: Usually within normal range
Rhythm: Regular
P waves: Normal
PR interval: Prolonged (> 5 Small boxes; > 0.20 sec)
QRS: Usually Narrow (≤ 0.12 sec)
3. 2nd Degree Type 2
Rate: Atrial rate > Ventricular rate
Rhythm: Atrial Regular, Ventricular irregular
P waves: Normal in Size & Shape
PR interval: PR interval stays constant; occasional P waves without QRS
QRS: Usually ≥ 0.12 sec with drop QRS complexes
4. 2nd Degree Type 1
Rate: Atrial rate > Ventricular rate
Rhythm: Atrial Regular, Ventricular irregular
P waves: Normal in Size & Shape
PR interval: Progressive lengthening of the PR interval until a beat is dropped (p wave is not followed by a QRS)
QRS: Usually Narrow (≤ 0.12 sec) with drop QRS complexes
For our video on Heart Blocks: https://youtu.be/zk232G5ilro
Disclaimer: This post is for educational purposes and is not intended as medical advice. While we strive for 100% accuracy, errors may occur, and medications or protocols may change over time.
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