What is the most common predisposing factor for type 2 vagal indigestion?

• A. Traumatic reticuloperitonitis (hardware disease)
• B. Hypocalcemia
• C. Lameness
• D. Nutritional myopathy

Answer: (A)

Vagal indigestion type II is a motility problem where the abomasal outflow becomes functionally obstructed due to damage to the vagus nerve, most often the dorsal vagal trunk. The classic trigger is traumatic reticuloperitonitis (hardware disease), because the reticulum is adjacent to the vagus nerves and inflammation or direct injury from a penetrating hardware lesion frequently injures these nerves, disrupting coordinated abomasal contractions and outflow. This loss of proper abomasal emptying leads to the characteristic signs of type II vagal indigestion.

Other conditions like hypocalcemia, lameness, or nutritional myopathy don’t specifically predispose to this abomasal outflow obstruction caused by vagal nerve injury, so they fit less well as predisposing factors for type II.