QuestionSBA
QuestionChoice
First-degree heart block would present on an ECG as a PR interval over 200ms. This ECG shows complete dissociation between P waves and QRS which is typical of third-degree heart block.
10025063
d
First-degree heart block
QuestionChoice
Mobitz type I heart block is a type of second-degree heart block commonly caused by a conduction system failure at the His-Purkinje system. An ECG will show increasingly prolonging PR intervals until there is a non-conducted P wave. The PR interval is longest just before the dropped beat, and then the cycle repeats again.
10025061
b
Second-degree heart block Mobitz type I
QuestionChoice
This patient's ECG is typical of third-degree heart block, not a STEMI. A STEMI would show an elevated ST segment in a regional pattern on the ECG.
10025064
e
ST-elevation myocardial infarction (STEMI)
QuestionChoice
This patient's ECG describes third-degree heart block. Third degree heart block is classically described as complete dissociation between P waves and QRS complexes.
10025060
a
Third-degree heart block
QuestionChoice
Mobitz type II heart block is a type of second-degree heart block where there is intermittent non-conducted P waves while the PR interval remains the same. This patient's ECG describes third-degree heart block. Third-degree heart block is classically described as complete dissociation between P waves and QRS complexes.
10025062
c
Second-degree heart block Mobitz type II
Concept
Chapter
2693
3699
Heart Block
Topic
134
Cardiology
17410
A 40-year-old female presents to the emergency department with palpations for ten hours. An  ECG shows complete dissociation between P waves and QRS complexes with a rate of 46.

What is the most likely diagnosis?
a