A 76-year-old woman with hypertension presents with repeated episodes of lightheadedness and intermittent palpitations followed by prolonged pauses. Vital signs show BP 142/88 mmHg, HR 48 bpm, RR 16, temp 37°C, SpO2 98% on room air. Electrocardiographic monitoring reveals periods of sinus bradycardia alternating with atrial fibrillation. Troponin is normal. She denies chest pain. Which of the following is the most likely diagnosis?
- A)Ventricular fibrillation
- B)Wolff Parkinson White syndrome
- C)Mobitz type I AV block
- D)Sick sinus syndromeGABARITO
- E)Atrial flutter only
Explicação
Sick sinus syndrome is correct. Degenerative fibrosis of the sinoatrial node can cause tachy brady syndrome with alternating sinus pauses or bradycardia and atrial tachyarrhythmias. Patients often present with syncope or lightheadedness. Ver explicação completa e trilha adaptativa →