# Comparison of short‐ and long‐term objective respiratory outcomes after surgery for brachycephalic obstructive airway syndrome

## TL;DR

This study shows that surgery for a breathing disorder in dogs provides lasting improvements in respiratory function over time.

## Contribution

The first study to report objective long-term respiratory outcomes following surgery for brachycephalic obstructive airway syndrome in dogs.

## Key findings

- Long-term postoperative respiratory function grades and BOAS indices improved compared to preoperative values.
- No significant difference was found between short-term and long-term postoperative outcomes.
- Most owners reported high satisfaction with the surgical results over the long term.

## Abstract

To report and compare short‐ and long‐term outcomes in dogs following surgery for brachycephalic obstructive airway syndrome (BOAS).

Longitudinal cohort study.

Client owned dogs (n = 32).

Dogs that underwent BOAS surgery before 2019 with preoperative and short‐term postoperative assessments were recruited for long‐term follow up to obtain respiratory functional grades (RFG) and BOAS indices. Dogs that underwent a second airway surgery (33 of 117) were excluded. Comparisons of BOAS indices and RFGs among preoperative, short‐term, and long‐term postoperative time points were performed using Friedman's tests and post hoc Wilcoxon signed rank tests with Bonferroni corrections.

There were 32 of 117 dogs available for long‐term assessment. Median long‐term postoperative assessments occurred at 1645 days after surgery (range 1208–2927 days). Long‐term postoperative RFG and BOAS index values were improved compared with preoperative values. There was no difference between short‐term and long‐term postoperative assessments (p > .999 for RFG values, and p = .623 for BOAS index values). Owners reported a high degree of satisfaction with surgery: 55% believed their dogs no longer had breathing problems (long‐term BOAS index 50.8 ± 17.6%) and 39% believed their dog still had breathing problems (long‐term BOAS index 48.9 ± 20.5%).

Improvements in RFG and BOAS Indices seen following surgery were maintained over time.

This is the first study with clinician‐assessed objective long‐term respiratory outcomes of BOAS surgery. The long‐term improvements in RFG and BOAS indices support the long‐term clinical benefit and durability of surgical intervention for BOAS.