About Jesse McLaren

Dr. Jesse McLaren (@ECGcases), is an Emergency Physician in Toronto with a special interest in emergency cardiology quality improvement and education. He is an Assistant Professor at the University of Toronto.

ECG Cases 11: LBBB + Occlusion MI

In ECG Cases 11 - LBBB + Occlusion MI Jesse McLaren runs through 5 patients who present with potentially ischemic symptoms and LBBB and explains the evolution of decision making for cath lab activation criteria. The two most important points are that we should always use the Smith-modified Sgarbossa Criteria to identify occlusion MI in the patient with ischemic symptoms and LBBB, whether old or new, and that those with refractory ischemia and hemodynamic instability from suspected occlusion MI require cath lab activation regardless of the ECG....

ECG Cases 10 – Hyperkalemia: The Great Imitator

Which of the following 9 patients had hyperkalemia? Can you estimate how high their serum potassium was based on the ECG? Jesse MacLaren guides us through 9 ECGs underscoring the fact that while the ECG cannot rule out hyperkalemia, significant hyperkalemia often produces ECG changes in the heart rate (bradycardia, junctional rhythm), electrical conduction (PR prolongation or loss of P waves, QRS prolongation, pacemaker delays), and ST/T waves (Brugada phenocopy, peaked T waves that are narrow/pointy) that can be easily recognized. He suggests when you might pull the trigger on giving empiric calcium treatment based on the ECG finding in this month's ECG Cases...

ECG Cases 8 Cardiovascular Emergencies During The COVID-19 Pandemic

In this ECG Cases blog we look at 6 patients who presented with cardiorespiratory symptoms, possibly from COVID and illustrate the dangers of anchoring, being hypervigilant for cardiovascular complications, and why testing for COVID in patients being admitted for ACS is important...

By |2020-04-14T21:50:57-04:00April 14th, 2020|Categories: COVID-19, ECG Cases|Tags: , , , , |2 Comments

ECG Cases 4: Lateral STEMI or Occlusion MI?

In this ECG Cases blog we look at seven patients with potentially ischemic symptoms and subtle ECG changes in the lateral leads. Which had acute coronary occlusion?  Introducing the concept of Occlusion MI - a paradigm shift in ECG diagnosis of MI...

By |2019-12-16T17:25:04-05:00December 16th, 2019|Categories: Cardiology, ECG Cases, Emergency Medicine, Medical Specialty|Tags: , , , , , |3 Comments

ECG Cases 3: Can you find the subtle inferior MI?

In this ECG Cases blog we look at 8 patients with potentially ischemic symptoms, to highlight pearls and pitfalls of inferior MI. Can you identify which ones had acute coronary occlusion?...

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