A patient is having an electrophysiological study and ablation for atrial fibrillation. Suddenly the blood pressure drops to 76/38 mmHg, with the heart rate at 110 in sinus rhythm. What is the best investigation to confirm the cause of hypotension?
A. Troponin
B. ST-segment elevation
C. Transoesophageal echocardiography
D. Coronary Angiogram
E. Electrocardiogram
F. MRI
Answer: C