colic

Strangulating vs. Nonstrangulating Lesions

  • Strangulating Lesions: Result in compromised blood supply to tissues, possibly leading to necrosis.

  • Nonstrangulating Lesions: Tissues may be in the wrong place without true arterial compromise, could lead to pain and edema but not necessarily tissue death.

Types of Colic Causes in Horses

  • Common Causes: In horses, gas accumulation is a common cause of colic that may often resolve with NSAIDs like Banamine.

  • Surgical Cases: 10% of cases may require surgery, usually referred from field treatment centers.

  • Small Intestine vs. Large Intestine Issues: Different causes for colic exist depending on whether the small or large intestine is affected.

Anatomy of the Horse's Intestine

  • Anatomy Overview:

    • Cecum: Large structure crucial for horse digestion.

    • Large Colon: Comprises the ventral and dorsal segments, and is prone to impaction problems due to the size changes.

  • Flexures of the Colon:

    • Sternal Flexure: Connects the ventral to dorsal sections.

    • Pelvic Flexure: A common site for impactions as it transitions from a larger to a smaller tube.

Colic Signs & Diagnosis

  • Symptoms: Signs of colic include discomfort and pain due to gas buildup.

  • Rectal Examination: Useful for assessing the location and type of colic; palpation can identify large impacts, particularly around the pelvic flexure.

Small Intestine Conditions

  • Entrapment Conditions: Common causes include lipomas (fatty tumors), which can strangulate parts of the intestine leading to vascular compromise.

  • Ileal Impaction: More prevalent in the southern U.S., potentially due to finer hay packing.

  • Gastric Ulcers: Major condition affecting the stomach, sometimes presenting similar symptoms to colic.

Cecal and Large Colon Conditions

  • Cecum: Holds a large volume and is commonly affected by gas or impaction which can lead to severe colic signs and necessitate surgical intervention.

  • Large Colon Impaction: Often treated with oral fluids or IV hydration; less commonly requires surgical intervention unless severe.

  • Nephrosplenic Entrapment: Occurs when gas in the colon allows it to flip over the kidney and spleen into a restricted space.

Surgical Techniques and Considerations

  • Surgery for Strangulations: Procedures involve resecting dead bowel sections or addressing impacted regions.

  • Post-Surgery Recovery: Careful monitoring of intestinal continuity and functionality is critical to avoid complications.

  • Nasogastric Intubation: Used for both treatment and diagnosis; essential in horses due to their inability to vomit.

Key Diagnostic Techniques

  • Ultrasound & Rectal Exams: Used to identify location and nature of obstructions, aiding in the diagnosis of strangulating versus non-strangulating lesions.

  • Fluid Therapy: Critical in management of colic cases to help rehydrate and relieve obstructions.

Conclusion

  • Understanding equine digestive anatomy is essential for diagnosing and treating colic effectively. Knowledge of when to use surgical techniques versus medical management is crucial for veterinary practice.