ECG anatomy segments

The electrocardiogram can pick up all sorts of electrolyte abnormalities. The most common abnormalities revolve around high and low levels of potassium and calcium. Magnesium derangements typically have nonspecific findings. How do you keep things straight? To make things more complicated, multiple electrolyte derangements can occur at the same time, making ECG interpretation challenging.

Thanks to Dr. Steve Field (Resident at Resurrection EM program) for the idea and card on electrolytes and ECG changes. Also take a look at Life In the Fast Lane’s extensive review of ECG abnormalities and their causes.

PV Card: ECG Manifestations of Electrolyte Imbalance

Adapted from [1] Go to ALiEM (PV) Cards for more resources.


  1. Diercks D, Shumaik G, Harrigan R, Brady W, Chan T. Electrocardiographic manifestations: electrolyte abnormalities. J Emerg Med. 2004;27(2):153-160. [PubMed]
Michelle Lin, MD
ALiEM Founder and CEO
Professor and Digital Innovation Lab Director
Department of Emergency Medicine
University of California, San Francisco
Michelle Lin, MD


Professor of Emerg Med at UCSF-Zuckerberg SF General. ALiEM Founder @aliemteam #PostitPearls at Bio:
Michelle Lin, MD