A 72-year-old female is brought to the ED in PEA arrest. She collapsed in the ED waiting room and was immediately brought to the resuscitation bay. She was found to be pulseless and high quality chest compressions were started immediately. Past medical history is unknown. On rhythm check, the ECG shows a narrow QRS complex. Bedside cardiac ultrasound shows a hyperdynamic left ventricle. Given your findings on ECG and ultrasound, the following are likely diagnoses, except:

About the Author: Anton Helman

Dr. Anton Helman is an Emergency Physician at North York General in Toronto. He is an Assistant Professor at the University of Toronto, Division of Emergency Medicine and the Education Innovation Lead at the Schwartz-Reisman Emergency Medicine Instititute. He is the founder, editor-in-chief and host of Emergency Medicine Cases.