A 79-year-old man with a history of hypertension presents with recurrent syncope and presyncope. Vital signs reveal BP 98/62 mmHg, HR 42 bpm, RR 16, temperature 37.2°C, and SpO2 98% on room air. Physical examination demonstrates marked bradycardia with an irregular pulse. ECG shows regular P waves at 80 bpm and regular QRS complexes at 40 bpm that are completely independent of each other. Troponin levels are normal. Which rhythm abnormality best explains these findings?
- A)Complete heart block with AV dissociationGABARITO
- B)Sick sinus syndrome
- C)Ventricular fibrillation
- D)First degree AV block
- E)Atrial flutter
Explicação
Complete heart block with AV dissociation is correct. Third degree AV block is defined by complete failure of atrial impulses to conduct to the ventricles, so atria and ventricles beat independently. This produces symptomatic bradycardia and often requires a p... Ver explicação completa e trilha adaptativa →