Accuracy of an Adrenocorticotropic Hormone (ACTH) Immunoluminometric Assay for Differentiating ACTH-Dependent from ACTH-Independent Hyperadrenocorticism in Dogs     

M.I. Rodríguez Piñeiro  G. Benchekroun  P. de Fornel-Thibaud  C. Maurey-Guenec  F. Garnier  D. Rosenberg 《Journal of veterinary internal medicine / American College of Veterinary Internal Medicine》2009,23(4):850-855

Background: Adrenocorticotropic hormone (ACTH) determination has been used for 30 years to distinguish ACTH-dependent hyperadrenocorticism (ADHAC) from ACTH-independent hyperadrenocorticism (AIHAC) in dogs. However, the few studies that have evaluated its diagnostic accuracy, based in the majority of cases on older assays, have been associated with systematic, but highly variable proportions of misclassified or unclassified cases.
Objective: The purpose of the present study is to evaluate the accuracy of a validated ACTH immunoluminometric assay (ILMA) for differentiating between ADHAC and AIHAC.
Animals: One hundred and nine dogs with hyperadrenocorticism were included: 91 with ADHAC and 18 with AIHAC.
Methods: Retrospective study. Dogs displaying feedback inhibition after the dexamethasone suppression test, adrenal symmetry, or both were considered to have ADHAC. AIHAC was demonstrated by adrenal tumor histology. For each group, ACTH determination by ILMA was reviewed.
Results: In the ADHAC group, plasma ACTH measurements ranged between 6 and 1250 pg/mL (median, 30 pg/mL). In the AIHAC group, all ACTH concentrations were below the lower quantification limit of the assay (<5 pg/mL). The 95% confidence interval was 85–100% for sensitivity and 97–100% for specificity in AIHAC diagnosis.
Conclusion and Clinical Importance: No overlap in ACTH concentrations was observed between dogs with ADHAC and dogs with AIHAC. The use of a new technique with high analytical sensitivity made it possible to use a low threshold (5 pg/mL), avoiding the misclassification of some ADHAC cases with low, but quantifiable concentrations of ACTH. The assessment of ACTH concentrations by ILMA is an accurate tool for differentiating between ADHAC and AIHAC.  相似文献   

Thyroid Function and Infertility in the Dog: A Survey in Five Breeds     

V Segalini  T Hericher  A Grellet  D Rosenberg  F Garnier  A Fontbonne 《Reproduction in domestic animals》2009,44(S2):211-213

In our study, a clinical and reproductive examination was undertaken in 204 dogs of five different breeds. Thyroxine and thyroid-stimulating hormone plasma concentrations were assayed in order to assess the real incidence of hypothyroidism associated with reproductive disease. Among these animals, only two breeds were affected by hypothyroidism (4.5% of the Dogue de Bordeaux and 2.4% of the Leonbergers). Moreover, these animals did not suffer from any reproductive disease. Our study showed also that 70% of the male Dogue de Bordeaux were hypothyroxinemic compared with Great Danes, English Mastiff and Leonbergers whose male population was 100% normothyroidic. We found the same tendency in bitches. In our data, there was no difference in thyroxin plasma concentrations between normo- and hypofertile dogs, but our results were not statistically significant.  相似文献