Atresia ani (Imperforate anus) is a condition in
which an animal either has a very small opening
or no anal opening at the time of birth due to a failure of the
anal membrane to break down.
Typical signs of
intestinal atresia include decreased appetite, progressive bilateral abdominal
distention, the absence of feces, episodes of straining to defecate, and
occasionally, blood-tinges mucous can be found around the rectum
Treatment
Only treatment for atresia ani is the Surgical correction. This consists of surgically opening the blind-ended sac ending
at the rectum and suturing around the newly created orifice. Lower epidural
anesthesia at C1- C2 (Inter-coccygeal ) junction with 1-1.5 ml lignocaine
epidural can desensitize the perineum . Further infiltration at the surgical
site of incision can ensure painless surgical procedure.
Ventral recumbancy with raised hind quarters with tails stretched backwards helps in easy access to the surgical site. Anal reconstruction is done by using close interrupted sutures apposing skin and rectal mucosa.
In field level surgical corrections needs to be attempted at early stage for better success rates. In villages the farmers resort to many cruel corrections methods such as excising with knife , poking with nails and tearing the anus with sharp objects to create opening . The is extremely unscientific and can results in irreparable trauma to the animal. Recently I got this case of nearly one month old calf with atresia anii and the farmer poked the anus with a sharp stick . even though it relieved some meconium it has lead to severe proctitis and adhesion.
The animal was having toxemia on presentation due to not passing dung for over
2 weeks. An emergency surgery followed by deliberate post-operative care saved
the calf.
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