Review Question - QID 214389

A 62-year-old woman with a past medical history of chronic obstructive pulmonary disease (COPD) and heart failure presents with palpitations and shortness of breath. Her symptoms have been gradually worsening over the past 2 days, and she has recent sick contacts at her bridge club. Her temperature is 99.0°F (37.2°C), blood pressure is 154/74 mmHg, pulse is 133/min, respirations are 14/min, and oxygen saturation is 90% on room air. Physical exam reveals bilateral wheezes and crackles on pulmonary auscultation. Bilateral lower extremity pitting edema and jugular venous distension are noted. An ECG is performed as seen in Figure A. Which of the following is the most likely diagnosis?