A 78-year-old man is brought to the emergency department because of recurrent syncope. Pulse is 32 per minute. ECG shows P waves occurring regularly at 80 per minute and QRS complexes occurring regularly at 30 per minute with no fixed relationship between them. Which of the following is the most likely diagnosis?

  1. A)Second-degree AV block, Mobitz I
  2. B)Junctional tachycardia
  3. C)Sinus node dysfunction
  4. D)Third-degree AV blockGABARITO
  5. E)Second-degree AV block, Mobitz II

Explicação

Complete AV dissociation with independent atrial and ventricular rates is third-degree AV block. The slow ventricular escape rhythm explains the patient’s marked bradycardia and syncope, and permanent pacing is often required. Ver explicação completa e trilha adaptativa →

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