Surgery for canine cricopharyngeal achalasia shows low mortality
Bottom line
Dogs treated surgically for cricopharyngeal achalasia appear to have a low risk of perioperative death, but a meaningful share will have persistent or recurrent swallowing signs afterward, according to a retrospective study in the American Journal of Veterinary Research. The study reviewed diagnostic imaging, surgical management, complications, and outcomes in dogs with this rare upper esophageal sphincter disorder, which typically presents in young dogs with dysphagia, gagging, nasal reflux, or coughing during eating and drinking. Across the broader literature, videofluoroscopic swallow study remains the key diagnostic test, and surgery, usually cricopharyngeal myotomy or myectomy with or without thyropharyngeal muscle procedures, is still considered standard treatment when true cricopharyngeal achalasia is confirmed. (merckvetmanual.com)
Why it matters: For veterinary professionals, the takeaway isn’t just that surgery can be lifesaving or curative in the right case. It’s that case selection and diagnosis still matter a great deal. Merck and prior reviews note that dogs with underlying neuromuscular disease or generalized pharyngeal weakness are less likely to respond well to surgery, and misclassification between cricopharyngeal achalasia and other swallowing disorders can help explain ongoing signs after an operation. That makes a careful neurologic exam, direct observation of eating and drinking, and high-quality videofluoroscopy central to workup and client counseling. The new study’s emphasis on recurrence or persistent signs reinforces the need to set expectations early with pet parents, even when short-term survival is good. (merckvetmanual.com)
What to watch: Whether future studies can better identify which preoperative findings, breeds, or concurrent disorders predict recurrence, and whether standardized videofluoroscopic criteria improve surgical selection and outcomes. (pubmed.ncbi.nlm.nih.gov)
Key facts
- Study type
- Retrospective study
- Journal
- American Journal of Veterinary Research
- Condition
- Canine cricopharyngeal achalasia
- Main finding
- Low perioperative mortality, but persistent or recurrent swallowing signs were common
- Typical signs
- Dysphagia, gagging, nasal reflux, and coughing during eating and drinking
- Diagnostic test
- Videofluoroscopic swallow study
- Standard treatment
- Cricopharyngeal myotomy or myectomy, with or without thyropharyngeal muscle procedures
- Risk factors for poorer response
- Underlying neuromuscular disease or generalized pharyngeal weakness
Surgery for canine cricopharyngeal achalasia appears to carry low mortality, but not all dogs get a clean resolution of clinical signs. That’s the central message from a new retrospective American Journal of Veterinary Research study, which examined how dogs with this uncommon swallowing disorder were diagnosed and managed surgically, and which factors might be linked to unsatisfactory postoperative outcomes. The condition affects the upper esophageal sphincter and can cause dysphagia, repeated swallowing attempts, gagging, regurgitation, and aspiration risk, often beginning early in life. (pubmed.ncbi.nlm.nih.gov)
That finding fits with what clinicians already know about cricopharyngeal achalasia: it’s rare, it can be confused with other forms of pharyngeal dysphagia, and it’s one of the few dysphagia syndromes in dogs where surgery may offer substantial improvement if the diagnosis is correct. Reviews and reference texts consistently describe videofluoroscopic swallow study as the diagnostic cornerstone. They also stress that dogs with secondary neuromuscular disease, acquired generalized weakness, or broader pharyngeal dysfunction may have a much more guarded prognosis than dogs with isolated cricopharyngeal outflow failure. (merckvetmanual.com)
The AJVR paper focused on diagnostic imaging findings, surgical approach, complications, and outcomes, then used statistical testing to look for predictors of less satisfactory results. While the abstract provided in your source data is truncated, related recent literature helps frame the significance. In a 2025 Journal of the American Veterinary Medical Association case series of 18 Spaniels treated surgically for cricopharyngeal achalasia, 17 survived to discharge, 11 had immediate complete resolution of signs, 5 had partial resolution, and 1 had no improvement; clinical signs later recurred in 3 dogs after initial cricopharyngeal myectomy. That report, along with Merck’s current clinical guidance, supports the broader conclusion that surgery is often beneficial, but persistent or recurrent mild signs are not unusual. (pubmed.ncbi.nlm.nih.gov)
Older literature has sometimes painted a more uniformly favorable picture. A 2001 report describing six young dogs found immediate and continued resolution of dysphagia after cricopharyngeal myectomy over follow-up periods ranging from two to eight years. But other publications have documented a more mixed reality, especially when diagnosis is delayed, when aspiration pneumonia complicates presentation, or when the underlying problem is not isolated achalasia. Complications described across reviews and case discussions include fibrosis, esophageal perforation, recurrent laryngeal dysfunction, aspiration pneumonia, and recurrence of dysphagia. (pubmed.ncbi.nlm.nih.gov)
Expert commentary in the available clinical literature is fairly consistent on one point: diagnostic precision is everything. Merck states that treatment usually consists of cricopharyngeal myotomy or combined cricopharyngeal and thyropharyngeal myectomy, often with immediate improvement in swallowing, but also notes that dogs with acquired neuromuscular disorders are less likely to benefit from surgery. A recent Angell review similarly warns that incomplete myectomy or an incorrect diagnosis can contribute to persistent dysphagia, and highlights aspiration pneumonia and fibrosis among the key postoperative concerns. (merckvetmanual.com)
Why it matters: For veterinary teams, this study sharpens the conversation around prognosis. Low mortality is reassuring, especially in a disorder that can leave young dogs malnourished or at risk for aspiration. But “successful surgery” shouldn’t be framed as synonymous with complete, permanent resolution in every patient. Referral clinicians and primary care veterinarians may want to place even more emphasis on preoperative differentiation between cricopharyngeal achalasia, cricopharyngeal asynchrony, generalized pharyngeal weakness, and systemic neuromuscular disease. That has practical implications for imaging protocols, anesthesia planning, nutrition support, and how pet parents are counseled about the possibility of residual signs or repeat intervention. (vmanyc.org)
The paper also lands at a time when interest in canine swallowing disorders is broadening. Comparative research has pointed to dogs as a useful natural model for some human oropharyngeal and esophageal disorders, and newer veterinary education materials continue to revisit whether less invasive options, including botulinum toxin in selected cases, might have a role alongside traditional open surgery. Still, the clinical consensus remains that definitive operative management is the standard for true cricopharyngeal achalasia in appropriate candidates. (pubmed.ncbi.nlm.nih.gov)
What to watch: The next step is better risk stratification. Future work may clarify whether age at onset, breed predisposition, videofluoroscopic patterns, surgical technique, or concurrent respiratory and neuromuscular disease can reliably predict which dogs will do well after surgery and which are most likely to have persistent or recurrent signs. (pubmed.ncbi.nlm.nih.gov)