Evaluation of hypophysectomy for treatment of hypersomatotropism in 25 cats
Avaliação da hipofisectomia para tratamento de hipersomatotropismo em 25 gatos
Kirsten L. van Bokhorst, Sara Galac, Hans S. Kooistra, Chiara Valtolina, Federico Fracassi, Dan Rosenberg, Björn P. Meij
Background: Successful treatment of cats with hypersomatotropism by transsphenoidal hypophysectomy is described in small numbers of cats.
Objectives: To describe the endocrine profile, survival, and remission rates of hypersomatotropism and diabetes mellitus in a cohort of cats with hypersomatotropism that underwent hypophysectomy between 2008 and 2020.
Animals: Twenty-five client-owned cats with spontaneous hypersomatotropism.
Methods: Retrospective study. Diagnosis of hypersomatotropism was based on clinical signs, plasma insulin-like growth factor-1 (IGF-1) concentration, and imaging of the pituitary gland. Growth hormone (GH) and IGF-1 concentrations were measured repeatedly after surgery. Survival times were calculated based on follow-up information from owners and referring veterinarians.
Results: Median postoperative hospital stay was 7 days (range, 3-18 days). One cat died within 4 weeks of surgery. Median plasma GH concentration decreased significantly from 51.0 ng/mL (range, 5.0-101.0 ng/mL) before surgery to 3.8 ng/mL (range, 0.6-13.0 ng/mL) at 5 hours after surgery. Remission of hypersomatotropism, defined as normalization of plasma IGF-1 concentration, occurred in 23/24 cats (median, 34 ng/mL; range, 14-240 ng/mL) and 22/24 cats entered diabetic remission. Median
survival time was 1347 days (95% confidence interval, 900-1794 days; range,
11-3180 days) and the overall 1-, 2-, and 3-year all-cause survival rates were 76%, 76%, and 52%, respectively.
Conclusions and Clinical Importance: This study shows the beneficial outcome of hypophysectomy in cats with hypersomatotropism, marked by low death rate and a high percentage of diabetic remission and definitive cure.
Acromegaly, diabetes mellitus, feline, pituitary adenoma, remission
Acromegalia, diabetes mellitus, felinos adenoma de pituitária, remissão, gatos, hipófise hipersomatotropismo