Meningitis After Tooth Extraction and Sinus Lavage in a Horse.
Authors: Zetterström Sandra, Groover Erin, Lascola Kara, Cole Robert, Velloso Ana, Boone Lindsey
Journal: Journal of equine veterinary science
Summary
# Editorial Summary A five-year-old Thoroughbred mare presenting with chronic unilateral nasal discharge and radiographic evidence of bilateral sinusitis secondary to infected cheek tooth roots (109 and 210) underwent extraction of the first tooth followed by bilateral conchofrontal sinus trephination and lavage, procedures commonly performed to manage secondary sinusitis in horses. Within the post-operative period, the mare developed clinical signs consistent with bacterial meningitis—fever, tachycardia, and cervical stiffness—which was confirmed via lumbosacral cerebrospinal fluid analysis, representing a rarely documented but serious complication of dental and sinus surgery. Aggressive multimodal therapy combining broad-spectrum antibiotics (penicillin, enrofloxacin, and metronidazole) with anti-inflammatory agents (flunixin meglumine, dexamethasone, and dimethyl sulfoxide) halted disease progression; the second abscessed tooth was subsequently extracted once acute signs resolved, and the mare remained clinically normal at twelve-month follow-up. Whilst bacterial meningitis following dental procedures is uncommon, this case underscores the importance of recognising early neurological signs and implementing rapid diagnostic and therapeutic intervention, as prompt treatment can achieve a favourable outcome. Equine practitioners managing dental disease or performing sinus surgery should maintain heightened clinical vigilance during the immediate post-operative period, particularly when treating bilateral or extensive tooth-related infection.
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Practical Takeaways
- •Bacterial meningitis is a rare but life-threatening potential complication of dental and sinus surgery in horses; maintain high clinical suspicion when fever, tachycardia, and cervical stiffness develop post-operatively.
- •Early cerebrospinal fluid analysis is critical for rapid diagnosis; prompt initiation of broad-spectrum antibiotic and anti-inflammatory therapy significantly improves survival outcomes.
- •Consider delaying extraction of secondary abscessed teeth until acute meningitis is resolved; staged surgical management may reduce risk in complex cases.
Key Findings
- •Bacterial meningitis developed in a Thoroughbred mare following tooth extraction and sinus lavage procedures for treatment of maxillary tooth root abscess and sinusitis.
- •Clinical signs of meningitis (fever, tachycardia, cervical stiffness) appeared post-operatively and were confirmed by lumbosacral cerebrospinal fluid analysis.
- •Aggressive multi-drug antibiotic therapy (penicillin, enrofloxacin, metronidazole) combined with anti-inflammatory treatment (flunixin meglumine, dexamethasone, DMSO) resulted in successful resolution.
- •The mare remained clinically normal 12 months post-treatment with no residual neurological signs, demonstrating that early diagnosis and appropriate therapy can achieve successful outcomes despite the life-threatening nature of the complication.