A 34-year-old woman is brought to the emergency department by ambulance with chest pain.
The pain started three days ago and has been associated with nausea, fatigue, and shortness of breath.
According to her family, these symptoms abruptly worsened today, and there was a brief period of reduced responsiveness before the paramedics arrived.
An ECG is taken on arrival to hospital, which is shown below:
Which of the following best describes this ECG?