Objective—To evaluate the occurrence of perianesthetic complications in dogs undergoing MRI for suspected intracranial disease and identify risk factors associated with observed complications.
Design—Retrospective case-control study.
Animals—238 client-owned dogs undergoing MRI of the brain.
Procedures—Signalment, clinical signs, neurologic examination findings, presumptive diagnosis, anesthesia-related variables, whether CSF was collected and CSF analysis results, severe perianesthetic complications (need for a ventilator following anesthesia or perianesthetic death), and anesthetic recovery time were recorded. Selected factors were compared between dogs with and without intracranial lesions and dogs with and without perianesthetic complications (including severe complications and prolonged anesthetic recovery [> 20 minutes from the end of anesthesia to extubation]).
Results—3 of 149 (2%) dogs with and 0 of 89 dogs without intracranial lesions required ventilation following anesthesia; the difference was nonsignificant. Recovery time was significantly longer in dogs with (median, 15 minutes) than in dogs without (10 minutes) intracranial lesions. Abnormal mentation prior to anesthesia was the only clinical sign that differed significantly between dogs with (15/26 [58%]) and without (70/212 [33%]) perianesthetic complications. A significantly larger proportion of dogs with perianesthetic complications had intracranial masses (13/26 [50%]), compared with dogs without these complications (56/212 [26%]).
Conclusions and Clinical Relevance—Dogs with complications were more likely to have had intracranial lesions than were dogs without complications, but few dogs had severe complications. Abnormal mentation was more common in dogs with than in dogs without complications. Prospective studies to further evaluate perianesthetic risk factors and procedures for improving outcomes in these patients are warranted.
Objective—To identify characteristics of exercise-induced collapse in Labrador Retrievers and compare characteristics for dogs with various dynamin 1 gene (DNM1) mutation statuses.
Design—Retrospective cross-sectional study.
Animals—109 Labrador Retrievers with a history of recurrent exercise-induced collapse, clinically normal behavior and gait between episodes, and no reason for collapse identified via medical evaluation.
Procedures—Data were collected via surveys from owners of dogs that were tested for an autosomal recessive DNM1 mutation causing DNM1-associated exercise-induced collapse (d-EIC). Dogs were identified as having d-EIC (homozygous for the mutation) or not having d-EIC (heterozygous for or without the mutation). Survey data were reviewed by an investigator unaware of the genotypes of dogs, and collapse characteristics were compared between groups.
Results—74 dogs had d-EIC; 35 dogs did not have d-EIC. Dogs with d-EIC were young (median age, 12 months) at the time of the first collapse episode; collapse in such dogs typically originated in the hind limbs and was characterized by low muscle tone, clinically normal mentation, and rapid recovery. Dogs without d-EIC were older (median age, 23 months) than dogs with d-EIC; such dogs had various characteristics of collapse that were not consistent with a single disease.
Conclusions and Clinical Relevance—Characteristics of exercised-induced collapse in Labrador Retrievers with various DNM1 genotypes were identified in this study; findings may help distinguish dogs with d-EIC from those with other types of collapse conditions. Characteristics of collapse in Labrador Retrievers that were not homozygous for the DNM1 mutation differed substantially among dogs and may have been attributable to multiple causes.
Objective—To determine clinical characteristics and
mode of inheritance of idiopathic epilepsy (IE) in
English Springer Spaniels.
Animals—45 dogs with IE and 74 siblings and their
Procedure—IE was diagnosed on the basis of age at
the time of seizure onset and results of laboratory
testing and neurologic examinations. Simple segregation
analysis was performed with the Davie method.
Results—Median age at the onset of seizures was 3
years; however, 9 (20%) dogs were between 5 and 6
years old at the time of the onset of seizures. Twentyone
dogs (47%) had generalized seizures, and 24
(53%) had focal onset seizures. Results of segregation
analysis were consistent with partially penetrant
autosomal recessive or polygenic inheritance.
Simulated linkage indicated that there was a 58%
chance of obtaining suggestive linkage with the available
Conclusions and Clinical Relevance—Results of the
present study suggest that in English Springer Spaniels,
IE segregates in a manner that is consistent with partially
penetrant autosomal recessive inheritance (ie, a
single major locus with modifying genes) or polygenic
inheritance. Given enough families with accurate phenotypic
information and available DNA, it should be possible
to use genetic linkage analysis to identify chromosomal
segments containing the causative gene or
genes. (J Am Vet Med Assoc 2005;226:54–58)
Objective—To evaluate the sensitivity and specificity of an enzyme immunoassay (EIA) for antibodies to a recombinant Blastomyces adhesin-1 repeat antigen (rBAD-1) to aid in the diagnosis of blastomycosis in dogs and compare the findings with results from other tests used for this purpose.
Design—Prospective analytic study.
Sample—Serum and urine from 70 dogs with and without blastomycosis.
Procedures—Serum and urine samples were collected from dogs with blastomycosis (n = 21), histoplasmosis (8), or nonfungal pulmonary disease (21) and from healthy control dogs living in a blastomycosis-endemic area (20). Serum was tested for antibodies against Blastomyces dermatitidis with the rBAD-1 antibody EIA and an A-antigen antibody agar gel immunodiffusion (AGID) assay. Serum and urine were tested for B dermatitidis antigen with a quantitative EIA.
Results—Sensitivity of the quantitative antigen EIA was 100% in serum and urine samples from dogs with blastomycosis, with specificity of 95% in urine samples from dogs with nonfungal pulmonary disease and 100% in urine samples from healthy dogs. Sensitivity of the rBAD-1 antibody EIA (95%) was significantly greater than that of the A-antigen antibody AGID assay (65%). Specificity of the antibody EIA was 88% in dogs with histoplasmosis, 95% in healthy dogs, and 100% in dogs with nonfungal pulmonary disease.
Conclusions and Clinical Relevance—The rBAD-1 antibody EIA had greater sensitivity than the A-antigen antibody AGID assay in dogs with blastomycosis. This antibody EIA may assist in distinguishing histoplasmosis from blastomycosis. Further evaluation in a larger prospective study is needed to verify these results.