Equine Oral, Esophageal and Rectal disorders

Esophageal anatomy and surgery

Anatomy / Physiology

1. Passes to left of trachea at level of C4; accompanied by common carotid, vagosympathetic trunk, and recurrent laryngeal nerve; enters cardia at level of 14th rib
2. Proximal 2/3 = striated muscle, distal 1/3 = smooth muscle
3. Only abdominal portion has serosal covering
4. Moderate dilations are normal just distal to the cranial sphincter, in the distal cervical region, and in the thorax

Esophagotomy

Esophagotomy is used to remove foreign objects (particularly stomach tubes) and occasionally for choke.  A  longitudinal incision is made over the obstruction or in adjacent healthy esophagus. Primary closure is performed if healthy tissue; otherwise it is left to heal by second intention.

Esophagostomy

The esophagus is opened in the midcervical region.  Esophagostomy is used for extraoral alimentation as an alternative to indwelling nasogastric tube. The tube is removed after 7-10 days -a stoma will be present that can be used for feeding. The stoma is allowed to heal by second intention when no longer needed.

Esophageal surgery complications

  • Dehydration + hyponatremia, hypochloremia, and transient metabolic acidosis
  • Dehiscence – difficult area for healing; can dehisce despite meticulous technique
  • Laryngeal hemiplegia  due to trauma to the recurrent laryngeal nerve at surgery or with inflammation
  • Aspiration pneumonia
  • Pleuritis
  • Horner’s syndrome due to trauma to the sympathetic trunk
  • Laminitis from high concentrate slurry diet
  • Chronic choke
  • Esophageal stricture

License

Icon for the Creative Commons Attribution-NonCommercial 4.0 International License

Large Animal Surgery - Supplemental Notes by Erin Malone, DVM, PhD; Elaine Norton, DVM PhD; Erica Dobbs, DVM; and Ashley Ezzo, DVM is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License, except where otherwise noted.