The Veterinary record · 2025
Evaluation of systemic consequences of brachycephalic obstructive airway syndrome in dogs.
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Facin Andréia Coutinho, Rein Ariadne, de Almeida Fabris Isabella, Gasser Beatriz, Aires Luiz Paulo Nogueira, Lima Bruna Bressianini, Gandra Daniele Azevedo, da Silva Daniela Gomes, Uscategui Ricardo Andrés Ramirez, Evangelista Gabriela Castro Lopes, Feliciano Marcus Antônio Rossi, Moraes Paola Castro
Аннотация
BACKGROUND: Brachycephalic obstructive airway syndrome (BOAS) results from upper airway anatomical abnormalities and may cause systemic effects depending on severity.
METHODS: A prospective, case‒control and observational study was conducted. All dogs underwent a physical examination, BOAS functional grading, and venous and arterial blood sampling for haematological, biochemical, arterial blood gas and acute phase protein (APP) analyses. The hypothesis was that APPs, leukogram parameters and arterial blood gas alterations are associated with BOAS severity.
RESULTS: Fifty-two brachycephalic dogs were assigned to BOAS grades 0 (n = 14), 1 (n = 15), 2 (n = 11) and 3 (n = 12) and then compared with a mesocephalic group (n = 15). BOAS grades 2 and 3 had higher haematocrit (HCT) (p = 0.045), and all grades showed elevated leukocyte counts (p = 0.005), creatinine (p < 0.001), alpha-1-acid glycoprotein (AGP) (p < 0.001), haptoglobin (p = 0.036) and arterial pressure of carbon dioxide (PaCO2) (p < 0.001) compared to mesocephalic dogs. Total protein (TP) was higher in grades 1-3 (p < 0.001), and albumin was lower in all BOAS grades (p < 0.001). Lactate was elevated in grade 0 and controls (p = 0.006). Multivariate analysis identified haemoglobin, HCT, TP, AGP, PaCO2, base excess and bicarbonate as the variables most strongly associated with BOAS severity.
LIMITATIONS: Age and weight selection criteria may have influenced BOAS scores and inflammatory markers.
CONCLUSION: BOAS grades were associated with hypoventilation, increased HCT and significant differences in inflammatory markers within physiological ranges, suggesting early systemic changes beyond respiratory dysfunction.
METHODS: A prospective, case‒control and observational study was conducted. All dogs underwent a physical examination, BOAS functional grading, and venous and arterial blood sampling for haematological, biochemical, arterial blood gas and acute phase protein (APP) analyses. The hypothesis was that APPs, leukogram parameters and arterial blood gas alterations are associated with BOAS severity.
RESULTS: Fifty-two brachycephalic dogs were assigned to BOAS grades 0 (n = 14), 1 (n = 15), 2 (n = 11) and 3 (n = 12) and then compared with a mesocephalic group (n = 15). BOAS grades 2 and 3 had higher haematocrit (HCT) (p = 0.045), and all grades showed elevated leukocyte counts (p = 0.005), creatinine (p < 0.001), alpha-1-acid glycoprotein (AGP) (p < 0.001), haptoglobin (p = 0.036) and arterial pressure of carbon dioxide (PaCO2) (p < 0.001) compared to mesocephalic dogs. Total protein (TP) was higher in grades 1-3 (p < 0.001), and albumin was lower in all BOAS grades (p < 0.001). Lactate was elevated in grade 0 and controls (p = 0.006). Multivariate analysis identified haemoglobin, HCT, TP, AGP, PaCO2, base excess and bicarbonate as the variables most strongly associated with BOAS severity.
LIMITATIONS: Age and weight selection criteria may have influenced BOAS scores and inflammatory markers.
CONCLUSION: BOAS grades were associated with hypoventilation, increased HCT and significant differences in inflammatory markers within physiological ranges, suggesting early systemic changes beyond respiratory dysfunction.