23rd May 2025

A 39-year-old female is brought into the emergency department following an out-of-hospital arrest.

A 39-year-old female is brought into the emergency department following an out-of-hospital arrest. She has received bystander CPR, 3 rounds of synchronised DC shocks and intravenous adrenaline and amiodarone. During rhythm check, the following trace is obtained:

Following a further two rounds of synchronised DC shocks and IV adrenaline, she is successfully resuscitated. Post-resuscitation ECG shows the following:

Which of the following is least likely to have contributed to her presentation?

Select the SINGLE most appropriate option from the list below. Select ONE option only.