A 71-year-old man presents after two episodes of syncope. Vital signs: BP 98/62, HR 42, RR 16, SpO2 98% on room air. He denies chest pain or dyspnea. Electrocardiogram shows a constant PR interval with intermittent nonconducted P waves and wide QRS complexes. Troponin is normal. Which of the following best describes this conduction abnormality?
- A)Block within the atrioventricular node that is usually benign
- B)Infranodal conduction disease with risk of progression to complete heart blockGABARITO
- C)Reentrant rhythm within the AV node
- D)Accessory pathway between the atria and ventricles
- E)Enhanced phase 4 depolarization in Purkinje tissue
Explicação
Infranodal conduction disease with risk of progression to complete heart block is correct. Mobitz type II block has fixed PR intervals with sudden dropped QRS complexes and commonly localizes to the His Purkinje system. Because it can progress to complete hear... Ver explicação completa e trilha adaptativa →