← 2026 ECG Competition Answers (Part 1)
Workout Quiz
5 questions. Answers are graded instantly with expert explanations.
1. A patient’s ECG shows grouped beating. The P-P interval is regular, the PR interval progressively lengthens, and then a P wave is not followed by a QRS complex. What is the best rhythm diagnosis?
Frequent premature atrial complexes
Complete heart block
Mobitz I AV block
Mobitz II AV block
2. Which ECG feature most strongly supports atrial septal defect in the appropriate clinical context?
Diffuse low voltage
Crochetage pattern in the inferior leads
ST elevation in aVR
Deep Q waves in V1-V3
3. Why is an irregular ventricular rhythm important when evaluating possible complete heart block?
It proves the rhythm is atrial fibrillation
It rules out any form of AV block
It argues against complete heart block because escape rhythms should be regular
It confirms Mobitz II AV block
4. A patient with chest tightness has inferior ST elevation and horizontal ST depression with upright T waves in the anterior leads. What associated finding should be suspected?
Posterior extension of inferior MI
Benign early repolarization
Hyperkalemia
Acute pericarditis
5. A 35-year-old man presents with vomiting and weakness. His ECG appears to show anterior ST elevation, but the QT interval is markedly short and there is no reciprocal ST depression. Which diagnosis should be strongly considered?
Acute anterior STEMI
Severe hypercalcemia
Hypocalcemia
Brugada syndrome
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