A 72 year old female with a history of breast cancer presents with dyspnea on exertion and dizziness. Her vital signs are BP 80/40, HR 120, RR 24, and oxygen saturation 88% on room air. Physical exam revealed rales at the left lung base, distant heart sounds, and elevated jugular venous pressures especially with inspiration. Her ECG is below. Also provided is a simultaneous recording of her arterial line pressure tracing and inspirometer.
What are the ECG findings?