This ECG is from a middle aged patient who presented with chest pain of uncertain duration.

This ECG shows ST elevation in V1 only. This was dynamic on serial ECGs. The cause was a proximal RCA occlusion. The T waves were peaked but the potassium was normal.

This ECG is from a middle aged patient who presented with chest pain of uncertain duration. This was the repeat ECG when pain returned.

This ECG shows ST elevation in V1, II, III and aVF with reciprocal ST depression in aVL. The cause was a proximal RCA occlusion. The T waves were peaked but the potassium was normal.

This ECG is from a man in his 50s with a history of thyroid cancer was brought to the Emergency Department after being found minimally unresponsive with sonorous respirations on his couch at home. Blood glucose level was 76 mg/dL. EMS administered naloxone, which was followed quickly by hyperventilation but no improvement in mental status. EMS performed RSI at that time using etomidate and succinylcholine, but intubation was unsuccessful. Luckily, BVM ventilation was easy in this patient, and he was bagged on the way to the ED, with oxygen saturation maintained in the mid-90s. He was intubated immediately on arrival to the ED using ketamine and rocuronium. This was the initial ED ECG.

This ECG is from a man in his 50s with a history of thyroid cancer was brought to the Emergency Department after being found minimally unresponsive with sonorous respirations on his couch at home. Blood glucose level was 76 mg/dL. EMS administered naloxone, which was followed quickly by hyperventilation but no improvement in mental status. EMS performed RSI at that time using etomidate and succinylcholine, but intubation was unsuccessful. Luckily, BVM ventilation was easy in this patient, and he was bagged on the way to the ED, with oxygen saturation maintained in the mid-90s. He was intubated immediately on arrival to the ED using ketamine and rocuronium. This was the repeat ECG after calcium had been administered.

This ECG is from a man in his 50s who presented with chest pain on a background of previous CABG and dual chamber pacemaker. This was the repeat ECG 16 min after arrival.

This ECG shows a ventricular paced rhythm with excessive discordant ST elevation in III and aVF, and ST depression in aVL. The cause was an inferior and right ventricular infarction.