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Comparative Study Of Different Techniques Of Tracheal Anastomosis With Various Degrees Of Resection In The Dog

By: Majid Khan, A | Dr. Mazhar Iqbal.
Contributor(s): Dr. Muhammkad Younas | Faculty of Veterinary Sciences.
Material type: materialTypeLabelBookPublisher: 1995Subject(s): Department of Clinical Medicine & SurgeryDDC classification: 0443,T Dissertation note: Tracheal stenosis in the dog is a common occurrence due to a wide variety of etiological factors like foreign body, neoplasm, collapsed tracheal ring etc. Resection of stenotic segment and end-to- end anastomosis of trachea is a practical procedure for the correction of tracheal stenosis. Several techniques of tracheal anastomosis are reported in literature. These techniques have been used with variable success. This project was designed to compare three techniques of tracheal anastomosis at two different degrees of resection. The study was carried out on 18 clinically healthy normal mongrel dogs. These dogs were divided into two groups (I & II) of 9 dogs each. In group I, four tracheal rings were resected while in group-Il resection of eight rings was performed. Each group was further subdivided into three subgroups i.e. Ia, Ib, Ic, ha, lIb and tic. This subdivision was based on three techniques of anastomosis to be tested. - In subgroups Ia and Ila simple interrupted pericartilaginous sutures were applied for anastomosis. - In subgroups lb and lIb everting anastomosis was performed by applying horizontal mattress through the apposed annular ligaments. - In subgroups Ic and lic telescoping anastomosis was performed. Caudal segment of the trachea was telescoped into the cranial segment. All the animals survived after the operation, no complication was observed. Healing occurred in all the subgroups. However on radiography luminal stenosis was observed in all the cases, which was more prominent in subgroups Ic and lIc as compared to other subgroups. This was also confirmed by gross examination at the postmortem. Histologically complete healing was observed at the end of 8th week post-operative. The everting anastomotic technique used in subgroups lb and lIb proved better in terms of tracheal apposition, narrowing of lumen and healing. The degree of resection as such seems to be having no effect on tracheal healing.
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Tracheal stenosis in the dog is a common occurrence due to a wide variety of etiological factors like foreign body, neoplasm, collapsed tracheal ring etc. Resection of stenotic segment and end-to- end anastomosis of trachea is a practical procedure for the correction of tracheal stenosis. Several techniques of tracheal anastomosis are reported in literature. These techniques have been used with variable success. This project was designed to compare three techniques of tracheal anastomosis at two different degrees of resection.

The study was carried out on 18 clinically healthy normal mongrel dogs. These dogs were divided into two groups (I & II) of 9 dogs each. In group I, four tracheal rings were resected while in group-Il resection of eight rings was performed. Each group was further subdivided into three subgroups i.e. Ia, Ib, Ic, ha, lIb and tic. This subdivision was based on three techniques of anastomosis to be tested.

- In subgroups Ia and Ila simple interrupted pericartilaginous sutures were applied for anastomosis.
- In subgroups lb and lIb everting anastomosis was performed by applying horizontal mattress through the apposed annular ligaments.

- In subgroups Ic and lic telescoping anastomosis was performed. Caudal segment of the trachea was telescoped into the cranial segment.

All the animals survived after the operation, no complication was observed. Healing occurred in all the subgroups. However on radiography luminal stenosis was observed in all the cases, which was more prominent in subgroups Ic and lIc as compared to other subgroups. This was also confirmed by gross examination at the postmortem. Histologically complete healing was observed at the end of 8th week post-operative.

The everting anastomotic technique used in subgroups lb and lIb proved better in terms of tracheal apposition, narrowing of lumen and healing. The degree of resection as such seems to be having no effect on tracheal healing.

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