Quiz: Recent University of Maryland Medical Center Cases (Part II)

1. A patient presents to the ED after an episode of chest pain which is now resolved. ECG shows biphasic T waves in leads V2 and V3 without significant ST segment elevation or depression. Which artery is MOST likely to have critical stenosis based on these findings?

Right coronary artery (RCA)Left circumflex artery (LCx)Proximal left anterior descending artery (LAD)Distal posterior descending artery (PDA)

2. Which ECG characteristic helps distinguish benign early repolarization variant from true Wellens waves?

Presence of deeply inverted T waveST segment depression preceding T wave inversionJ wave with concave upward ST segment before sharp T wave inversionBiphasic T wave without preceding J wave

3. ECG diagnosis of complete heart block requires both AV dissociation and:

Irregularly irregular ventricular rhythmRegular, independent escape rhythmProgressive prolongation of PR intervalFrequent premature ventricular complexes (PVCs)

4. Which finding MOST strongly suggests a junctional escape rhythm rather than a ventricular escape rhythm in a patient with complete heart block?

Wide QRS complexes at 30 bpmNarrow QRS complexes at 50 bpmIrregular ventricular responsePR intervals progressively lengthening

5. You notice atrial fibrillation on ECG with a surprisingly regular ventricular rhythm at 48 bpm. Which condition BEST explains this finding?

Atrial flutter with 2:1 conductionComplete heart block with escape rhythmMobitz type II AV blockFrequent premature ventricular complexes (PVCs)

Workout Quiz