Replacing a Veterinary Physiology Endocrinology Lecture with a Blended Learning Approach Using an Everyday Analogy.

Understanding scientific concepts and processes is critical for veterinary education. This article outlines the impact of blended learning and the use of an analogy on student understanding of the hypothalamic-pituitary-target gland axis over a three-year period. The first-year veterinary physiology course at our institution was modified to incorporate a blended learning approach. An analogy centered around a fast-food restaurant was introduced via an animated video to explain key concepts using an online module. Students completed the module on their own time and class time was optional for asking questions or obtaining clarification as needed. Learning was assessed using the same set of multiple-choice exam questions (MCQs). As hypothesized, students using the online module performed equally well (significantly better for those in the lower quartile) on three summative MCQs to those who received the same information delivered by traditional lecture. Student feedback identified positive aspects regarding blended learning using the analogy, including dynamic visuals, ability to work at their own time and pace, and ease of repeating information. Students cited lack of discipline and poor time management as obstacles to completing the module. Changing the anatomy and physiology of the hypothalamus and pituitary gland from static images and text to an animated video significantly improved student's preference for the blended learning approach. Blended learning and the analogy was preferred by 47% of students over the traditional lecture format (21% preferred traditional lecture and 32% were indifferent) and it was more effective in helping students master this important physiological concept.

Mucocutaneous nasal histoplasmosis in an immunocompetent dog.

BACKGROUND: Histoplasma (H.) capsulatum is a dimorphic fungus, and infection is typically via inhalation of microconidia. After conversion to the yeast phase within the lung, the organism is subsequently disseminated to other tissues by macrophages. Nasal histoplasmosis appears to be a rare condition in dogs. CASE PRESENTATION: We report the clinical case of a 4.5-year-old male neutered Cocker spaniel/Poodle mix, 7.7 kg, body condition score 6/9, that presented with a 3-month history of sneezing and left-sided mucoid nasal discharge. The history also included a mild swelling (transient) of the right carpus with a lameness (grade II-III/IV), coinciding with the onset of sneezing and nasal discharge. The dog lived primarily indoors in the Texas Gulf Coast area. On physical examination, the dog was febrile, and the left nostril was swollen, ulcerative, deformed, and hypopigmented. Mandibular lymph nodes were firm and mildly enlarged bilaterally. Mild lymphopenia, thrombocytopenia, and hyperglobulinemia were noted. Thoracic radiographs were unremarkable. Computed tomography and rhinoscopy revealed swelling of the rostral portion of the left and right nasal passages. Cytology and histology of biopsies of the affected nasal tissue showed pyogranulomatous inflammation and yeast organisms consistent with H. capsulatum. Weak antigenuria was detected on the MVista H. capsulatum antigen test. Treatment with oral itraconazole led to a resolution of the nasal signs and normalization of the appearance of the nostril over 13 weeks, and neither antigenuria nor antigenemia was detected on several recheck examinations. The dog remained in good general and physical condition and showed no signs of disease recurrence more than 6 years after the last examination. CONCLUSION: We report a rare case of nasal mucocutaneous histoplasmosis in an immunocompetent dog, with an excellent clinical response to oral itraconazole. This case documents that histoplasmosis in dogs can affect primarily the nasal cavity, which responds rapidly to triazole antifungal therapy and has a good prognosis. A similar case has only been reported in human medicine in a young adult.

Small Animal Resident Selection Processes at a University Teaching Hospital: An Analysis and Recommendations for Improvement.

Concerns regarding resident performance within a small animal department prompted a review of selection practices, with the intent of improving validity and efficiency. Information was gathered from semi-structured interviews and descriptions of current processes; emphasis was placed on determining how the Veterinary Internship and Residency Matching Program application was used. Processes were found to lack standardization and rely heavily on arbitrary judgments. In addition, faculty members expressed concerns regarding their reliability and the time spent generating candidate rankings. Suggestions for improvement were based on current practices in personnel psychology and human resource management. The need for standardization within and across specialty groups was emphasized, along with a multiple-hurdle approach in which a substantial deficit or red flag in any component results in candidate disqualification. Comprehensive recommendations were made for the selection process as follows: Each application undergoes initial administrative screening for employment eligibility and academic cut-offs; eligible applications are scored by 2-3 faculty members using defined ratings on four equally weighted pre-interview criteria (i.e., veterinary education, post-graduation experiences, personal statement, and standardized letters of reference); phone calls to colleagues with knowledge of the applicant follow specific guidelines and a rating scale; veterinary-situational structured interview questions with appropriate rating scales are used to assess candidates' standing on specified competencies identified as important for success; and the interview score is weighted equally and added to the four pre-interview components to determine the final rank. It is hoped this new approach will take less time and facilitate the selection of successful residents.

Bacterial Biogeography of the Colon in Dogs With Chronic Inflammatory Enteropathy.

The intestinal microbiota is believed to play a role in the pathogenesis of inflammatory bowel disease in humans and chronic inflammatory enteropathy (CIE) in dogs. While most previous studies have described the gut microbiota using sequencing methods, it is fundamental to assess the spatial distribution of the bacteria for a better understanding of their relationship with the host. The microbiota in the colonic mucosa of 22 dogs with CIE and 11 control dogs was investigated using fluorescence in situ hybridization (FISH) with a universal eubacterial probe (EUB338) and specific probes for select bacterial groups. The number of total bacteria labeled with EUB338 probe was lower within the colonic crypts of dogs with CIE compared to controls. Helicobacter spp. and Akkermansia spp. were decreased on the colonic surface and in the crypts of dogs with CIE. Dogs with CIE had increased number of Escherichia coli/Shigella spp. on the colonic surface and within the crypts compared to control dogs. In conclusion, the bacterial microbiota in the colonic mucosa differed between dogs with and without CIE, with depletion of the crypt bacteria in dogs with CIE. The crypt bacterial species that was intimately associated with the host mucosa in control dogs was composed mainly of Helicobacter spp.

Clinical pharmacokinetics and outcomes of oral fluconazole therapy in dogs and cats with naturally occurring fungal disease.

This multi-institutional study was designed to determine the clinical pharmacokinetics of fluconazole and outcomes in client-owned dogs (n = 37) and cats (n = 35) with fungal disease. Fluconazole serum concentrations were measured. Pharmacokinetic analysis was limited to animals at steady state (≥72 hr of treatment). The mean (range) body weight in 31 dogs was 25.6 (2.8-58.2) kg and in 31 cats was 3.9 (2.4-6.1) kg included in pharmacokinetic analyses. The dose, average steady-state serum concentrations (CSS ), and oral clearance in dogs were 14.2 (4.5-21.3) mg/kg/d, 26.8 (3.8-61.5) µg/mL, and 0.63 ml min-1  kg-1 , respectively, and in cats were 18.6 (8.2-40.0) mg/kg/d, 32.1 (1.9-103.5) µg/mL, and 0.61 ml min-1  kg-1 , respectively. Random inter-animal pharmacokinetic variability was high in both species. Two dogs had near twofold increases in serum fluconazole when generic formulations were changed, suggesting lack of bioequivalence. Median CSS for dogs and cats achieving clinical remission was 19.4 and 35.8 µg/ml, respectively. Starting oral doses of 10 mg/kg q12h in dogs and 50-100 mg total daily dose in cats are recommended to achieve median CSS associated with clinical remission. Due to the large pharmacokinetic variability, individualized dose adjustments based on CSS (therapeutic drug monitoring) and treatment failure should be considered.

Sonographic findings of pinpoint hyperechoic foci in the small intestine, liver, and mesenteric lymph nodes are indicative of canine Heterobilharzia americana infection.

Canine schistosomiasis, caused by the trematode Heterobilharzia americana, can pose a diagnostic challenge due to nonspecific symptoms. The aim of this multicenter, retrospective, descriptive study was to compare the prevalence and extent of sonographic changes associated with schistosomiasis between affected and infection-free dogs. Medical records of two referral centers were searched for dogs with confirmed schistosomiasis that had undergone an abdominal ultrasound. Fifty-five cases fulfilled the inclusion criteria, and a contemporaneous control group was derived from dogs that tested negative for H. americana. Two blinded reviewers evaluated the images. The majority of Heterobilharzia-infected (further termed H-pos) dogs (82%) had ultrasonographic abnormalities in the small intestine ± liver. Abnormal layering of the small intestine was noted in 38 of 54 H-pos dogs, compared to six of 54 control dogs (P < .0001). Pinpoint hyperechoic foci were noted in the small intestinal submucosa or muscularis layers in 25 of 54 H-pos dogs, but only three controls (P < .0001). Heterogeneity of the hepatic parenchyma and pinpoint hyperechoic foci were more prevalent in H-pos dogs (65% vs 40%; P = .0213 and 44% vs 18%; P = .0068, respectively). Pinpoint hyperechoic foci within mesenteric lymph nodes were noted in seven H-pos dogs and none of the controls (P = .0128). The combination of heterogeneous small intestine wall layering and pinpoint hyperechoic foci in small intestine, liver, or mesenteric lymph nodes was the most reliable indication of infection (P = .0001; odds ratio = 36.87), with positive predictive value of 94%, yet modest sensitivity for the detection of infection (58%). Observing these sonographic features suggests schistosomiasis and should prompt further testing.

Multiple-Choice Questions in Small Animal Medicine: An Analysis of Cognitive Level and Structural Reliability, and the Impact of these Characteristics on Student Performance.

Students entering the final year of the veterinary curriculum need to integrate information and problem solve. Assessments used to document competency prior to entry to the clinical environment should ideally provide a reliable measurement of these essential skills. In this study, five internal medicine specialists evaluated the cognitive grade (CG) and structural integrity of 100 multiple-choice questions (MCQs) used to assess learning by third-year students at a United States (US) veterinary school. Questions in CG 1 tested factual recall and simple understanding; those in CG 2 required interpretation and analysis; CG 3 MCQs tested problem solving. The majority (53%) of questions could be answered correctly using only recall or simple understanding (CG 1); 12% of MCQs required problem solving (CG 3). Less than half of the questions (43%) were structurally sound. Overall student performance for the 3 CGs differed significantly (92% for CG 1 vs. 84% for CG 3; p = .03. Structural integrity did not appear to impact overall performance, with a median pass rate of 90% for flawless questions versus 86% for those with poor structural integrity (p = .314). There was a moderate positive correlation between individual student outcomes for flawless CG 1 versus CG 3 questions (rs = 0.471; p = < .001), although 13% of students failed to achieve an aggregate passing score (65%) on the CG 3 questions. These findings suggest that MCQ-based assessments may not adequately evaluate intended learning outcomes and that instructors may benefit from guidance and training for this issue.

Piecemeal endoscopic polypoidectomy for the management of a canine pharyngeal hemangiosarcoma.

A 7-year-old castrated male Maltese dog was presented for increased respiratory sounds, inability to bark, dysphagia, and hyporexia. Radiographs revealed an ovoid, opaque mass in the caudal nasopharynx. An airway examination and computed tomography scan were followed by endoscopic polypoidectomy. The mass was a hemangiosarcoma, and the patient survived > 13 months.

Polypoïdectomie endoscopique fragmentaire pour la gestion d'un hémangiosarcome pharyngé canin. Un chien Bichon maltais mâle castré âgé de 7 ans a été présenté pour des sons respiratoires accrus, l'incapacité de japper, de la dysphagie et de l'hyporexie. Les radiographies ont révélé une masse ovoïde opaque dans le nasopharynx caudal. Un examen des voies respiratoires et une tomodensitométrie ont été suivis d'une polypoïdectomie endoscopique. La masse était un hémangiosarcome et le patient a survécu >13 mois.(Traduit par Isabelle Vallières).

Prognostic value of C-reactive protein in dogs with elevated serum pancreatic lipase immunoreactivity concentrations.

OBJECTIVE: To determine the prognostic value of serum C-reactive protein (CRP) in dogs with pancreatitis. ANIMALS: 503 client-owned animals with pancreatic lipase immunoreactivity (PLI) > 600 µg/L. METHODS: Routine submissions to the Texas A&M Gastrointestinal Laboratory were monitored for canine samples with PLI > 600 µg/L. Clinics were emailed 2 weeks after PLI measurement and asked the following questions: (1) was the dog hospitalized, and (2) is the patient alive? If a response was received, serum CRP concentration was measured using leftover serum. RESULTS: Paired PLI and CRP results were available for 503 dogs. Median PLI was 984 µg/L (range, 603 to 2,001 µg/L); median CRP was 9.9 mg/L (range, 9.9 to 395.3 mg/L; ref: < 10 mg/L). Inpatient care was provided to 136 dogs (27.0%); 49 dogs (9.7%) died or were euthanized. Median PLI values for dogs that died versus survived were similar. Median CRP was higher in hospitalized dogs (36.1 vs 9.9 mg/L; P < .0001) and those that died (37.2 vs 9.9 mg/L; P < .0001). Compared to dogs with CRP < 10 mg/L, those with CRP > 10 mg/L were 5.3 times more likely to die (CI, 2.7 to 10.2) and 5.7 times (CI, 3.7 to 8.7) more likely to be hospitalized. CLINICAL RELEVANCE: In dogs with PLI > 600 µg/L, CRP > 10 mg/L was associated with increased risk of hospitalization or death. This biomarker may provide prognostic information in dogs with evidence of pancreatitis and guide decisions regarding hospitalization or referral.

Palatal erosion and oronasal fistulation following covered nasopharyngeal stent placement in two dogs.

Treatment options for dogs with nasopharyngeal stenosis include fluoroscopic placement of metallic stents. Reported complications include entrapment of hair and food, obstruction and persistent nasal discharge. Two toy breed dogs were examined for persistent nasal discharge and halitosis at 4 and 20 months after placement of permanent metallic stents for acquired nasopharyngeal stenosis. Full thickness defects were found in the palate of both dogs, with extensive communication between the mouth and the nasal passages. Portions of the metal stent were observed within the lesion in both patients. Additional treatment was declined by the owner of one dog; the stent was removed through the fistula in the other dog. Palatal erosion with secondary oronasal fistulation is a potential complication of nasopharyngeal stent placement in dogs.

Effect of withholding food versus feeding on creatinine, symmetric dimethylarginine, cholesterol, triglycerides, and other biochemical analytes in 100 healthy dogs.

BACKGROUND: Withholding food is often recommended before collection of blood for routine biochemical analysis in dogs despite a paucity of evidence to support this requirement. OBJECTIVES: To compare measurements of selected biochemical analytes collected before and after feeding in clinically healthy dogs. ANIMALS: One hundred clinically healthy staff- and student-owned dogs weighing ≥15 kg. METHODS: Prospective observational study. Food was withheld from the dogs for 10-26 hours. Preprandial serum was collected, and then dogs were fed their usual food at an amount equivalent to at least 2/3 resting energy requirement (RER). Selected serum analytes were measured at 2-, 4-, 6-, and 8-hours postprandially. The proportion of postprandial values that exceeded either the reported allowable total error (TEa), or for symmetric dimethylarginine (SDMA), the reference change value (RCV), was determined. As neither TEa nor RCV is available for lipase, comparison was made to the high end of the reference interval (RI). RESULTS: The proportion of dogs with at least 1 postprandial measurement that exceeded the TEa or RCV was 92/100 for triglycerides, 66/100 for blood urea nitrogen (BUN), 46/100 for phosphorus, 17/100 for glucose, 9/100 for bilirubin, 5/100 for SDMA, 2/100 for creatinine, and 0/100 for cholesterol and albumin. Postprandial lipase never exceeded the RI in dogs with normal fasted lipase. CONCLUSIONS AND CLINICAL IMPORTANCE: Withholding food is generally not necessary before performing routine biochemical analysis in clinically healthy dogs. Withholding food might be helpful to limit variability in analytes impacted by feeding, such as triglycerides and phosphorus.

Clinical utility of fungal culture and antifungal susceptibility in cats and dogs with histoplasmosis.

BACKGROUND: Culture can be used for diagnosis and antifungal susceptibility testing in animals with fungal infections. Limited information is available regarding the diagnostic performance of culture and the susceptibility patterns of Histoplasma spp. isolates. HYPOTHESIS/OBJECTIVES: Describe the clinical utility of culture and the susceptibility patterns of Histoplasma spp. isolates causing histoplasmosis in cats and dogs. ANIMALS: Seventy-one client-owned animals, including 33 cats and 19 dogs with proven or probable histoplasmosis. METHODS: Culture was attempted from tissue or fluid samples. Diagnostic performance of culture, cytopathology, and antigen detection were compared with final diagnosis. Susceptibility to antifungal agents was determined for a subset (11 from dogs, 9 from cats) of culture isolates. RESULTS: Culture had a diagnostic sensitivity of 17/33 (52%; 95% confidence interval [CI], 34%-69%) and 15/19 (79%; 95% CI, 61%-97%) and specificity of 6/6 (100%; 95% CI, 54%-100%) and 10/10 (100%; 95% CI, 69%-100%) in cats and dogs, respectively. Culture was not positive in any animal in which cytopathology and antigen testing were negative. Target drug exposure (area under the concentration curve [AUC]/minimum inhibitory concentration [MIC] >25) should be easily achieved for all isolates for itraconazole, voriconazole, or posaconazole. Five of 20 (25%) isolates had fluconazole MIC ≥32 µg/mL and achieving target drug exposure is unlikely. CONCLUSIONS AND CLINICAL IMPORTANCE: Fungal culture did not improve diagnostic sensitivity when used with cytopathology and antigen detection. Susceptibility testing might help identify isolates for which fluconazole is less likely to be effective.

Clinical features of muscle stiffness in 37 dogs with concurrent naturally occurring hypercortisolism.

BACKGROUND: Severe muscle stiffness (SMS) in dogs with hypercortisolism (HC) is uncommon. OBJECTIVES: To evaluate signalment, presentation, treatments, and long-term outcomes of dogs with concurrent HC and SMS. ANIMALS: Thirty-seven dogs. METHODS: Medical records of dogs with HC and concurrent SMS were recruited from 10 institutions. Clinical information, test results, therapeutic responses, and survival times were reviewed. RESULTS: All 37 dogs with HC and SMS had pituitary-dependent hypercortisolism (PDH); 36/37 weighed <20 kg. Signs and test results were typical of PDH aside from SMS, initially diagnosed in all 4 limbs in 9, pelvic limbs of 22, and thoracic limbs of 6 dogs. Hypercortisolism and SMS were diagnosed together in 3 dogs; HC 1-36 months before SMS in 23; SMS 1-12 months before HC in 11. Mitotane or trilostane, given to control HC in 36/37 dogs, improved or resolved HC signs in 28; SMS did not resolve, remaining static or worsening in 31/36 dogs, mildly improving in 5/19 dogs given additional therapies. Progression of SMS included additional limbs in 10 dogs and the masticatory muscles of 2. The median survival time from diagnosis of SMS was 965 days (range, 8-1188). CONCLUSIONS AND CLINICAL IMPORTANCE: Concurrent SMS and HC is uncommon, possibly affecting only dogs with PDH. Development of SMS might occur before or after diagnosis of HC. Apart from SMS, the clinical picture and survival time of these dogs seem indistinguishable from those of dogs with HC in general. However, while muscle weakness usually resolves with HC treatment SMS does not.

Pharmaceutical evaluation of compounded trilostane products.

Compounded trilostane capsules (15 mg, 45 mg, or 100 mg) were purchased from eight pharmacies and assayed for content and dissolution characteristics. Capsules made in-house containing either inert material or 15 mg of the licensed product and proprietary capsules (30 mg and 60 mg) served as controls. Findings were compared with regulatory specifications for the licensed product. Altogether, 96 batches of compounded trilostane and 16 control batches underwent analysis. In total, 36 of 96 (38%) compounded batches were below the acceptance criteria for content. The average percentage label claim (% LC) for each batch ranged from 39% to 152.6% (mean, 97.0%). The range of average % LC for the controls was 96.1-99.6% (mean, 97.7%). The variance in content of the purchased compounded products was substantially greater than for the controls (234.65 versus 1.27; P<0.0001). All control batches exceeded the acceptance criteria for dissolution, but 19 of 96 batches (20%) of purchased compounded products did not. Mean percent dissolution for the purchased compounded products was lower than for controls (75.96% versus 85.12%; P=0.013). These findings indicate that trilostane content of compounded capsules may vary from the prescribed strength, and dissolution characteristics may not match those of the licensed product. The use of compounded trilostane products may therefore negatively impact the management of dogs with hyperadrenocorticism.

Schistosomiasis in the United States.

Canine schistosomiasis is a well-established cause of a granulomatous enteropathy and hepatopathy in dogs. In a small subset of patients, infection triggers significant hypercalcemia. Clinical signs and clinicopathologic findings are fairly nonspecific but ultrasonographic evidence of heterogenous small intestinal wall layering and pin-point hyperechoic foci in bowel, nodes, and liver is highly suggestive of infection. A sensitive, commercially available, fecal polymerase chain reaction test can be used to establish the diagnosis. Treatment protocols rely on praziquantel with fenbendazole. Most dogs will recover, although retreatment may be necessary in a substantial proportion. Housemates should be screened as infection can be asymptomatic.

Prospective evaluation of complications associated with transesophageal echocardiography in dogs with congenital heart disease.

BACKGROUND: Transesophageal echocardiography (TEE) is useful in the assessment and procedural monitoring of congenital heart disease (CHD) with a relatively low complication rate in humans. OBJECTIVES: To evaluate the safety of TEE and report complications in dogs. ANIMALS: Forty client-owned dogs with CHD. METHODS: Prospective observational study including gastroesophagoscopy before and after TEE imaging. TEE was planned with a GE 6VT-D adult probe in dogs weighing ≥4 kg and a GE 10T-D microprobe alternating with an intracardiac echocardiography probe placed in the esophagus in dogs <4 kg. Difficulties with probe placement, probe interference and TEE probe imaging times were recorded. Dogs were monitored in the recovery period after TEE using an established nausea scoring system. RESULTS: New gastroesophageal abnormalities were identified after TEE in 4 dogs including 4 areas of mucosal damage involving <25% of the lower esophageal sphincter (n = 4) and 1 lesion at the heart base (n = 1) and were not attributed to longer imaging times or a specific probe. Lesions identified before TEE in 4 dogs remained unchanged after TEE. The 6VT-D probe could not be placed in 1 dog with enlarged tonsils, and it obstructed fluoroscopic views in 3 dogs. The probes did not compress any structures in dogs in which fluoroscopy was performed (n = 20). Four dogs had evidence to suggest nausea after the procedure. CONCLUSIONS AND CLINICAL IMPORTANCE: While major complications remain possible, complications in this study were mild and few in number. Dog size and probe characteristics are factors to consider when performing TEE.

Feline comorbidities: Recognition, diagnosis and management of the cushingoid diabetic.

PRACTICAL RELEVANCE: Diabetes mellitus (DM) is a common feline endocrinopathy, and is often driven by underlying insulin resistance with associated pancreatic beta (ß)-cell dysfunction. Although spontaneous hyperadrenocorticism (HAC) with hypercortisolemia (hypercortisolism) is relatively uncommon in cats, it is a well-established cause of insulin resistance and is routinely associated with DM in this species. CLINICAL CHALLENGES: Many of the clinical signs associated with feline HAC are subtle and may be attributed to concurrent DM or the aging process. Failure to recognize HAC in the diabetic cat can impact patient wellbeing and predispose the patient to progressive compromise. Unfortunately, it can be difficult to establish a diagnosis of HAC, as test results may be influenced by poor diabetic regulation, and protocols are different to those used in canine patients. Treatment options depend on the underlying cause, and often require careful, ongoing assessment and modulation of both adrenal function and insulin requirements. However, various approaches have been shown to either improve glycemic control in cats with sustained insulin dependence, or facilitate diabetic remission. EVIDENCE BASE: This review summarizes the current literature on feline HAC, with a particular focus on cats with concurrent DM. The clinical findings that suggest HAC are discussed, along with an outline of diagnostic options and their limitations. Published outcomes for various medical options, surgical procedures and radiation therapy are provided. The authors also share their thoughts on the safe and effective management of cats with HAC and DM, with an emphasis on the anticipation and recognition of changing insulin requirements.

Impact of preheparinization and sample volume on routine hematology findings in healthy cats.

OBJECTIVES: It can be challenging to collect sufficient blood from feline patients for both a biochemical profile and a complete blood count (CBC). The ability to generate accurate hematologic and biochemical data from a single, small (<2 ml) sample could reduce patient stress and improve clinical efficiency. The objective of this study was to determine the impact of preheparinization and/or sample size on routine hematology findings in cats. METHODS: Blood was collected from 20 healthy cats; measured aliquots were placed directly into tubes containing either EDTA or lithium-heparin (Hep). Within 2 mins, specific volumes were removed from the Hep tubes and placed in additional EDTA tubes. Four distinct sample sizes/types were created from each cat: (1) 1.3 ml EDTA (criterion standard); (2) 0.5 ml EDTA; (3) 1.3 ml Hep + EDTA; and (4) 0.5 ml Hep + EDTA. Three CBCs were performed on each sample using an automated bench-top hematology analyzer. Drops of blood were contemporaneously used to create three air-dried stained slides from each tube. Triplicate results were averaged for statistical analysis; results were compared across all sample types and against the criterion standard. Significance was set at P <0.05. RESULTS: Preheparinization did not significantly impact determinations of erythrocyte number, hematocrit, hemoglobin concentration, mean cell volume and neutrophil count. Platelet counts for the non-traditional samples correlated poorly with the criterion standard, although numbers could be effectively estimated using stained slides. Cell morphology was well preserved across all sample types. CONCLUSIONS AND RELEVANCE: These results indicate that a 0.5 ml preheparinized EDTA blood sample can generate clinically useful hematologic data (excluding platelet count) in cats, using a bench-top analyzer. Our findings support the collection of a single small (<2 ml) sample that can be used for both biochemical and hematologic analyses. Further studies are needed to verify these findings using other hematology machines and in diseased cats.

Heterobilharzia americana infection in dogs: A retrospective study of 60 cases (2010-2019).

BACKGROUND: The trematode Heterobilharzia americana (HA) causes granulomatous gastrointestinal and hepatic disease in dogs. Before 2008, diagnosis relied on saline fecal sedimentation or histopathology, and earlier reports primarily described dogs with advanced disease or cases diagnosed incidentally at necropsy. The advent of a fecal PCR test has facilitated the diagnosis of HA and provided insights into manifestations and response to treatment. OBJECTIVES: Describe the clinical findings, response to treatment, and outcome for dogs infected with HA. ANIMALS: Sixty dogs diagnosed with HA between 2010 and 2019. METHODS: Retrospective study. Medical records were searched for dogs diagnosed with HA by fecal PCR testing, identification of ova in feces, or histopathology. RESULTS: Mean age was 7.5 (±4.1) years and weight was 23.2 (±10.18) kg. Clinical signs included diarrhea (55.8%), vomiting (46.2%), and weight loss with or without anorexia (15.4%). Laboratory abnormalities included hyperglobulinemia (42.6%) and increased liver enzyme activities (30%). More than 40% of dogs had an eosinophil count >500/µL. Hypercalcemia attributable to HA was identified in only 4 dogs. Pinpoint hyperechoic foci were noted in intestines, liver, or mesenteric lymph nodes during transabdominal ultrasonography in 64.4% of dogs. Survival data was available for 34 dogs, of which 73.5% (25) were alive 6 months after diagnosis. CONCLUSIONS AND CLINICAL IMPORTANCE: Hyperglobulinemia, high eosinophil count, and ultrasonographic evidence of visceral mineralization were suggestive of infection. Hypercalcemia was uncommon. Combination treatment with praziquantel and fenbendazole was variably effective, and 17.6% of treated dogs with known outcome died as a result of HA infection.

Evaluation of the use of baseline cortisol concentration as a monitoring tool for dogs receiving trilostane as a treatment for hyperadrenocorticism.

OBJECTIVE: To determine whether a single measurement of cortisol concentration can be used to monitor dogs receiving trilostane for hyperadrenocorticism. DESIGN: Controlled drug efficacy trial. ANIMALS: 103 client-owned dogs. PROCEDURES: Results of ACTH stimulation tests before and during trilostane treatment were evaluated. Each cortisol concentration after ACTH stimulation was classified as indicative of excessive, acceptable, or inadequate control of adrenal gland function, as outlined by the trilostane manufacturer. Baseline cortisol concentrations before and during trilostane treatment were evaluated; target variables were defined, and sensitivity, specificity, and predictive values were determined. RESULTS: Results of 103 and 342 ACTH stimulation tests before and during treatment were evaluated. In this population, baseline cortisol concentrations ≥ 1.3 µg/dL accurately excluded excessive suppression (defined by cortisol concentration after ACTH stimulation < 1.5 µg/dL) in 254 of 259 (98%) dogs. In addition, baseline cortisol concentrations ≤ 2.9 µg/dL correctly excluded inadequate control (defined by cortisol concentration after ACTH stimulation > 9.1 µg/dL) in 200 of 211 (95%) dogs. During trilostane treatment, baseline cortisol concentrations between 1.3 and either 2.9 µg/dL or ≤ 50% of the pretreatment baseline cortisol concentration correctly predicted acceptable control of adrenal gland function in 147 of 168 (88%) dogs. CONCLUSIONS AND CLINICAL RELEVANCE: Evaluation of a baseline cortisol concentration collected 4 to 6 hours after trilostane administration in dogs with hyperadrenocorticism provided clinically useful information about control of adrenal gland function. Many dogs receiving trilostane may be adequately monitored without the expense and inconvenience of an ACTH stimulation test.