Hogan P M, Embertson R M, Hunt R J
Rood & Riddle Equine Hospital, Lexington, KY 40580, USA.
J Am Vet Med Assoc. 1995 Aug 15;207(4):471-3.
A 4-month-old Thoroughbred foal was examined because of a history of exercise intolerance and lack of airflow from the right nostril since birth. Endoscopy of the airways revealed complete membranous obstruction of the right nasal passage at the level of the nasopharynx and marked narrowing of the caudal aspect of the right ventral meatus. Unilateral choanal atresia was diagnosed. Laser ablation of the obstructing tissues was attempted through a videoendoscope. Scar tissue occluded the right nasal passage at follow-up examination 7 weeks later. Intranasal resection, using laparoscopic instruments, was then performed, and a nasal stent was maintained for 2 weeks after surgery. At 1 year of age, the foal was reported to have decreased airflow from the right nares and excessive respiratory noise during exercise. Atresia of the choanae in horses usually is bilateral and, therefore, life-threatening and detectable at birth. Unilateral choanal atresia may not be suspected until later, but should be considered in horses with decreased or no airflow from 1 naris.
一匹4个月大的纯种马驹因自出生以来有运动不耐受病史且右鼻孔无气流通过而接受检查。气道内窥镜检查显示，在鼻咽水平处右鼻道完全被膜性阻塞，右腹侧鼻道尾侧部分明显狭窄。诊断为单侧后鼻孔闭锁。尝试通过视频内窥镜对阻塞组织进行激光消融。7周后的随访检查中，瘢痕组织阻塞了右鼻道。随后使用腹腔镜器械进行了鼻内切除，并在术后放置鼻支架2周。据报道，这匹马驹1岁时右鼻孔气流减少，运动时呼吸噪音过大。马的后鼻孔闭锁通常是双侧的，因此危及生命，且在出生时即可检测到。单侧后鼻孔闭锁可能直到后期才会被怀疑，但对于鼻孔气流减少或无气流的马匹应予以考虑。
