← Recent University of Maryland Medical Center Cases (Part III)
Workout Quiz
5 questions. Answers are graded instantly with expert explanations.
1. Which ECG finding BEST characterizes Mobitz Type I (Wenckebach) AV block?
Constant PR intervals with random dropped beats
Gradually lengthening PR intervals followed by a nonconducted P wave
Complete AV dissociation with regular ventricular rhythm
Fixed 2:1 conduction ratio without PR interval variability
2. Complete heart block is identified BEST by which of the following ECG features?
Regular atrial rhythm, constant PR intervals
Regular ventricular rhythm independent of atrial activity
Regularly irregular grouped QRS complexes
Consistent 2:1 conduction ratio with normal PR intervals
3. In a second-degree AV block with 2:1 conduction, which statement is correct regarding Mobitz type identification?
It is always Mobitz I (Wenckebach).
It is always Mobitz II.
It cannot reliably be differentiated as Mobitz I or II.
It typically indicates complete heart block.
4. Which ECG feature helps differentiate Mobitz AV block from atrial fibrillation?
Presence of grouped beats (regularly irregular rhythm)
Completely regular rhythm
Consistent absence of T waves
Normal PR intervals throughout
5. What distinguishes frequent premature atrial contractions (PACs) causing grouped beats from Mobitz AV block causing grouped beats?
PACs consistently cause prolonged PR intervals.
PACs have regularly occurring lonely (nonconducted) P waves.
Mobitz block shows regularly occurring lonely P waves, PACs do not.
Mobitz block always produces a regular ventricular rhythm
Answer 5 more questions
