NAVLE Gastrointestinal and Digestive

Feline Regurgitation Study Guide

Regurgitation is the passive expulsion of food, fluid, or other material from the esophagus or pharynx. Unlike vomiting, regurgitation does not involve abdominal contractions or nausea.

Overview and Clinical Importance

Regurgitation is the passive expulsion of food, fluid, or other material from the esophagus or pharynx. Unlike vomiting, regurgitation does not involve abdominal contractions or nausea. It is a critical clinical sign indicating esophageal dysfunction. Distinguishing regurgitation from vomiting is essential for proper diagnosis and treatment planning.

Esophageal diseases account for approximately 1% of referral feline cases, but recognition is essential as complications such as aspiration pneumonia represent the leading cause of morbidity and mortality in affected cats.

Structure Clinical Significance
Upper Esophageal Sphincter (UES) Cricopharyngeus muscle; remains closed except during swallowing. Dysfunction causes cricopharyngeal achalasia.
Lower Esophageal Sphincter (LES) Physiologic sphincter (not anatomic); prevents gastroesophageal reflux. Dysfunction leads to GERD and esophagitis.
Distal 1/3 Smooth Muscle Unique to cats; prokinetics may help in this region. Herringbone mucosal pattern visible on contrast studies.
Esophageal Angles Feline esophagus has sharp angles contributing to FB entrapment: esophageal entrance (63%), thoracic inlet (27%), mid-cervical (10%).

Feline Esophageal Anatomy: Key Points

High-YieldThe distal one-third of the feline esophagus is composed of smooth muscle (unlike dogs, where the entire esophagus is striated muscle). This has therapeutic implications: prokinetic drugs like cisapride may have limited efficacy in cats with megaesophagus since most of the esophagus is skeletal muscle.
Feature Regurgitation Vomiting
Process Passive; no effort required Active with abdominal contractions (retching)
Prodromal Signs None; cat lowers head and material exits Nausea: lip-smacking, drooling, restlessness
Material Origin Esophagus or pharynx Stomach and/or duodenum
Content Appearance Undigested, tubular, covered with mucus; no bile Partially digested; may contain bile
pH Neutral to alkaline Acidic

Differentiating Regurgitation from Vomiting

One of the most critical clinical skills is distinguishing regurgitation from vomiting. This differentiation determines the diagnostic approach and narrows the differential diagnosis list.

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