Surgical repair of cleft soft palate in the horse.

This article describes a surgical method to fix a cleft in a horse’s soft palate by using two access routes to reach different parts of the defect. The front (rostral) portion of the cleft is repaired through a mandibular symphysiotomy, and the back (caudal) portion is repaired through a pharyngotomy incision.

What the paper reports

• It presents a technique for repairing a cleft soft palate in horses that combines two surgical approaches to improve exposure and suturing accuracy along the entire length of the defect.
• The anterior (rostral) segment of the cleft is accessed via a symphysiotomy (splitting the mandibular symphysis), while the posterior (caudal) segment near the nasopharynx is approached via a pharyngotomy incision.

Background: cleft soft palate in horses

• Clefts of the soft palate are uncommon congenital defects in foals, leading to milk regurgitation from the nostrils, coughing, poor growth, and frequent aspiration pneumonia.
• Repair is technically challenging due to limited access to the deep oral and pharyngeal spaces, constant motion of the palate during swallowing, and risk of contamination and dehiscence.
• Traditional transoral approaches often provide inadequate visibility and working space, especially for the caudal soft palate, which reduces the likelihood of a durable, tension-free closure.

Surgical strategy described

• Use a mandibular symphysiotomy to improve rostral intraoral exposure for precise debridement and layered closure of the anterior portion of the soft palate cleft.
• Perform a pharyngotomy to gain direct access to the caudal aspect of the soft palate for accurate suturing on the nasopharyngeal side, where visualization is otherwise poor.
• Combine these approaches to allow complete, staged repair from front to back, minimizing blind suturing and reducing tension along the suture lines.

Key steps of the procedure (conceptual)

• Preoperative evaluation: confirm diagnosis and extent with endoscopy; assess for aspiration pneumonia; plan airway management (often temporary tracheostomy) due to shared airway and surgical field.
• Symphysiotomy approach (anterior repair):
  • Perform osteotomy at the mandibular symphysis to temporarily separate the mandibular rami and retract for expanded oral access.
  • Debride the cleft edges minimally and close in layers (nasal mucosa, muscular layer, oral mucosa) using absorbable sutures, aiming for a watertight, tension-minimized seal.
  • Stabilize the mandibular symphysis after intraoral work (e.g., wire/cerclage or plate, depending on size and surgeon preference).
• Pharyngotomy approach (posterior repair):
  • Create a controlled incision into the pharyngeal wall to access the caudal soft palate and nasopharyngeal surfaces.
  • Complete layered closure of the caudal cleft under direct visualization, ensuring precise apposition of mucosal edges.
  • Close the pharyngotomy site after confirming integrity of the soft palate repair.
• Adjuncts: maintain a protected airway throughout; consider feeding tube placement to bypass the oropharynx during early healing.

Rationale for the dual approach

• Rostral access alone rarely permits reliable visualization of the caudal soft palate; the pharyngotomy directly exposes this region for accurate suturing.
• Symphysiotomy creates sufficient working space to perform meticulous, layered closure at the rostral end, which is difficult through a closed mandible in foals.
• By matching the access route to the segment of the cleft, the surgeon reduces surgical time spent on blind maneuvers, lowers tissue trauma, and improves the likelihood of a continuous, tension-free repair.

Anesthesia and airway considerations

• Securing the airway independent of the surgical field is critical; a temporary tracheostomy is commonly used to avoid contamination and protect against airway compromise.
• Positioning and intraoperative suction are essential to manage secretions and reduce aspiration risk during and after the repair.

Postoperative care and expected outcomes

• Strict aspiration precautions: head positioning, suction as needed, and feeding strategies that minimize pharyngeal passage (e.g., nasogastric or gastrostomy feeding) until mucosal healing is robust.
• Antibiotics and anti-inflammatories are typically used, along with careful monitoring for pneumonia, dehiscence, or fistula formation.
• Gradual reintroduction of oral feeding is based on endoscopic reassessment of palatal integrity and function.
• Outcomes are historically guarded for equine cleft palate repairs, but improved exposure and layered closure can increase the chance of functional swallowing and reduced nasal regurgitation.

Risks and potential complications

• Local: suture line dehiscence, oronasal fistula, infection, hemorrhage, scarring with palatopharyngeal dysfunction.
• Systemic/respiratory: aspiration pneumonia, airway obstruction, need for prolonged tracheostomy care.
• Symphysiotomy-specific: malocclusion, instability or nonunion at the mandibular symphysis, hardware complications.

Clinical implications

• This technique is most applicable to foals with isolated soft palate clefts or predominant soft palate involvement where full-length exposure is required for a tension-free, layered closure.
• It underscores the importance of tailoring the surgical approach to the anatomic segment of the defect to optimize visualization and repair quality.

Limitations and context

• The abstract describes the approach but does not provide case numbers, success rates, or long-term functional outcomes, so broader efficacy and complication rates are not established here.
• Results may depend heavily on surgeon experience, perioperative airway management, and meticulous postoperative care.

Alternatives and variations

• Transoral-only repairs for small, rostral defects, though limited by exposure for caudal lesions.
• Endoscopic assistance to improve visualization without extensive external approaches in select cases.
• Staged procedures or adjunctive tissue flaps where primary closure under low tension is not achievable.