Feline Ingestion of Poisonous Plants – NAVLE Study Guide

Overview and Clinical Importance

Plant toxicosis represents a significant cause of morbidity and mortality in cats, with lilies (Lilium and Hemerocallis species) being the most dangerous and frequently tested plant toxin on the NAVLE. Cats are uniquely susceptible to certain plant toxins, and the ASPCA Animal Poison Control Center reports that plant ingestions consistently rank among the top ten toxin exposures in felines. Understanding the clinical presentation, pathophysiology, and treatment of plant toxicoses is essential for every veterinarian.

Section 1: Lily Toxicosis - The Most Critical Plant Poisoning

Toxic Lily Species

The Lilium and Hemerocallis genera contain species that cause acute nephrotoxicity in cats. All parts of these plants are toxic, including petals, leaves, pollen, and even the water in the vase.

Nephrotoxic Lilies (TRUE Emergency)

Non-Nephrotoxic "Lilies" (Different Toxin Profiles)

Pathophysiology of Lily Nephrotoxicity

The exact nephrotoxic compound in lilies remains unidentified, but research has confirmed it is a water-soluble compound present in all parts of the plant. The aqueous fraction of flowers is more potent than leaf extract. The toxin is rapidly absorbed from the GI tract and targets the renal tubular epithelium, specifically the proximal convoluted tubules.