A 58-year-old man presents with palpitations and dyspnea on exertion. Vital signs: BP 138/82 mmHg, HR 92 bpm, RR 18/min, temp 37.2°C, SpO2 98% on room air. ECG demonstrates an rSR-prime pattern in lead V1 with QRS duration of 128 milliseconds. Chest X-ray shows normal heart size. He denies syncope. Troponin is negative. He takes no cardiac medications. Which diagnosis best explains these findings?
- A)Atrial flutter
- B)Left bundle branch block
- C)Preexcitation syndrome
- D)Right bundle branch blockGABARITO
- E)Hyperkalemia
Explicação
Right bundle branch block classically produces an rSR-prime pattern in V1 with a widened QRS. Delayed activation of the right ventricle causes terminal rightward forces in the right precordial leads. Ver explicação completa e trilha adaptativa →