A 64-year-old man with hypertension presents with substernal chest pain. Vital signs: BP 98/62, HR 48, RR 14, Temp 37°C, SpO2 98%. ECG shows inferior ST elevation with PR prolongation. Troponin is elevated at 2.8 ng/mL. He denies dyspnea. He takes lisinopril daily. Which coronary artery was most likely involved in the ischemia causing these conduction abnormalities?

  1. A)Diagonal branch
  2. B)Right coronary arteryGABARITO
  3. C)Left circumflex artery
  4. D)Left anterior descending artery
  5. E)Obtuse marginal artery

Explicação

The AV node is most commonly supplied by the right coronary artery. Inferior myocardial infarction due to RCA occlusion can therefore cause sinus node dysfunction, AV nodal ischemia, bradycardia, and Wenckebach-type block. Ver explicação completa e trilha adaptativa →

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