QuestionSBA
QuestionChoice
Mobitz type I (Wenckebach phenomenon) is a type of 2nd-degree heart block due to a block in conduction through the AV node. This would present as **progressive PR interval lengthening** and then would drop off, failing to conduct a QRS complex.
10000038
c
Mobitz type I
QuestionChoice
Patients would present with crushing chest pain and show ST elevation in leads V3-4. ST depression in inferior leads may also be seen (II, III and aVF).
10000040
e
Anterior STEMI
QuestionChoice
This is a type of 2nd-degree heart block where P waves fail to be conducted. The PR interval remains at a constant length however it is not consistently conducted and may or may not show a fixed ratio e.g. 2:1.
10000039
d
Mobitz type II
QuestionChoice
Complete (3rd degree) heart block occurs due to atrial impulses failing to pass to the ventricles. Patients can present with syncope or cardiac arrest and have bradycardia on ECG. There is no relationship between P and QRS complexes.
10000036
a
Complete heart block
QuestionChoice
Electrical activity is being prolonged through the AV node and therefore causes a prolonged PR interval (>200ms). 1st-degree heart block can occur in those with a high vagal tone, after an acute inferior MI, hyperkalaemia and drugs e.g. digoxin.
10000037
b
1st-degree heart block
Concept
Chapter
2693
3699
Heart Block
Topic
134
Cardiology
12554
A 66-year-old male patient presents to A&E with syncope. An ECG is performed showing a rate of 34 bpm and no relationship between the P and QRS complexes.

Which of the following is the most likely diagnosis?
a