A 74-year-old man with acute inferior wall myocardial infarction develops bradycardia with a heart rate of 38 bpm. Physical exam reveals cannon A waves in the neck. ECG shows P waves marching through QRS complexes at regular intervals, with QRS duration of 0.12 seconds. Which of the following is the most likely diagnosis?
- A)Sick sinus syndrome
- B)Sinus bradycardia with bundle branch block
- C)Third-degree atrioventricular block with junctional escape rhythmGABARITO
- D)Second-degree type II atrioventricular block
- E)First-degree atrioventricular block
Explicação
Third-degree (complete) AV block presents with complete dissociation of P and QRS complexes. P waves are regular but unrelated to QRS complexes. With inferior MI, the escape rhythm originates at the AV junction (junctional escape) with a rate of 40-60 bpm and ... Ver explicação completa e trilha adaptativa →