Plant Toxicoses – BCSE Study Guide

Overview and Clinical Importance

Plant toxicoses represent a significant cause of morbidity and mortality in veterinary medicine, affecting companion animals, livestock, and exotic species. Understanding the mechanisms, clinical presentations, and treatments for common plant poisonings is essential for entry-level veterinarians. This guide covers six major categories of plant toxicoses frequently tested on the BCSE: cardiac glycosides, cyanogenic plants, oxalate-containing plants, pyrrolizidine alkaloids, lily toxicity in cats, and sago palm toxicosis.

1. Cardiac Glycoside-Containing Plants

Overview and Common Plants

Cardiac glycosides are naturally occurring compounds that inhibit the sodium-potassium ATPase pump (Na+/K+-ATPase), leading to disrupted cardiac electrolyte balance and potentially fatal arrhythmias. These toxins are structurally similar to digoxin and found in numerous ornamental and wild plants.

[Include Image: Figure 1. Oleander (Nerium oleander) showing characteristic narrow leaves and pink/white flowers] Image Source: Wikimedia Commons: https://commons.wikimedia.org/wiki/File:Nerium_oleander_flowers_leaves.jpg