A 71-year-old man with prior anterior myocardial infarction presents with palpitations and presyncope. Vital signs show BP 88/56, HR 170, RR 22, SpO2 98% on room air. ECG demonstrates regular wide-complex tachycardia at 170 bpm with uniform QRS morphology and absence of AV dissociation. Troponin is normal; chest X-ray shows no acute pulmonary process. He denies dyspnea. Which of the following is the most likely mechanism of this arrhythmia?
- A)Accessory pathway conduction from atrium to ventricle
- B)Multiple atrial foci with variable conduction
- C)Reentry confined to the AV node
- D)Automatic firing from the sinus node
- E)Reentry around a ventricular scarGABARITO
Explicação
In a patient with prior myocardial infarction, sustained monomorphic ventricular tachycardia is most often due to reentry around a scarred area of ventricular myocardium. The regular wide-complex rhythm with uniform morphology supports a stable ventricular ree... Ver explicação completa e trilha adaptativa →