heart block

Question 1

what is a first degree heart block ?

Answer 1

PR interval > 0.2 seconds

Question 2

what is a second degree heart block

Answer 2

type 1 (Mobitz I, Wenckebach): progressive prolongation of the PR interval until a dropped beat occurs

type 2 (Mobitz II): PR interval is constant but the P wave is often not followed by a QRS complex

Question 3

what is a third degree heart block ?

Answer 3

there is no association between the P waves and QRS complexes

Question 4

auscultory features of first degree heart block ?

Answer 4

soft s1

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Question 23

clinical features of complete heart block ?

Answer 23

syncope

heart failure

regular bradycardia (30-50 bpm) - lightheadedness

wide pulse pressure
JVP: cannon waves in neck

Question 24

what can be heard on auscultation with complete heart block?

Answer 24

variable intensity of S1

Question 25

which coronary artery is affected when there is a complete heart block following an MI ?

Answer 25

right coronary artery lesion

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Question 33

auscultory features of LBBB?

Answer 33

soft S1