Megaesophagus attributable to lead toxicosis in a cat

Area of Science:

• Veterinary Medicine
• Toxicology
• Gastroenterology

Background:

• Lead toxicosis is a significant health concern in domestic animals, potentially affecting multiple organ systems.
• Megaesophagus, characterized by esophageal dilation and impaired motility, can manifest secondary to various underlying conditions.
• Neuromuscular dysfunction in the pharynx and larynx can lead to regurgitation and aspiration risks.

Observation:

• A 3-year-old domestic shorthair cat presented with regurgitation, particularly when handled, suggestive of distress and potential swallowing dysfunction.
• Clinical examination revealed evidence of pharyngeal and laryngeal dysfunction.
• The cat exhibited macrocytic regenerative anemia, a finding not typically associated with classic signs of lead poisoning like basophilic stippling.

Findings:

• Megaesophagus was diagnosed as the primary condition, attributed to lead toxicosis.
• The cat's pharyngeal/laryngeal dysfunction and macrocytic regenerative anemia were directly linked to lead exposure.
• Successful resolution of megaesophagus, swallowing dysfunction, and anemia was achieved following chelation therapy with calcium EDTA.

Implications:

• This case highlights lead toxicosis as a treatable cause of megaesophagus and associated neurological deficits in cats.
• Calcium EDTA chelation therapy is effective in reversing the clinical manifestations of lead-induced megaesophagus and anemia.
• Early diagnosis and intervention are crucial for managing lead toxicosis and improving outcomes in affected felines.