Background: Dogs with myxomatous mitral valve disease (MMVD) can experience progressive renal tubular damage and dysfunction. The prevalence of renal tubular damage is not known in dogs with stable MMVD. Objective: To evaluate renal tubular damage in dogs with stable MMVD by evaluation of urinary neutrophil gelatinase-associated lipocalin (NGAL). Animals: Ninety-eight MMVD dogs grouped according to the American College of Veterinary Internal Medicine (ACVIM) staging (group B1, n = 23; group B2, n = 27; group C + D, n = 48) and 46 healthy dogs. Methods: Multicenter prospective observational study. Serum and urine chemistry including NGAL reported as uNGAL concentration (uNGAL) and normalized with urinary creatinine (uNGALC) were compared between MMVD dogs and healthy controls, and among different MMVD ACVIM stages. Results: The MMVD dogs had significantly higher uNGAL and uNGALC (1204 pg/mL; range, 30-39 732 and 1816 pg/mg; range, 22-127 693, respectively) compared to healthy dogs (584 pg/mL; range, 56-4072 and 231 pg/mg; range, 15-2407, respectively; P = .002 and P < .0001, respectively). Both uNGAL and uNGALC increased with the increasing ACVIM stage (P = .001 and P < .001, respectively). Conclusions and Clinical Importance: Renal tubular damage is present in dogs with stable MMVD, as measured by increased uNGAL. This tubular damage is subclinical, occurs in all stages of MMVD even in the absence of azotemia, and increases with the severity of MMVD. Reno-protective approaches to manage MMVD dogs should be explored to slow the progression of renal tubular damage in these patients.

Systolic murmurs in the absence of cardiac structural abnormalities are common in cats. Narrow aorto-septal angle (AoSA) and septal remodeling can be a cause of a systolic murmur in elderly human beings. The aim of this study was to measure the AoSA in cats and to investigate the association between the AoSA and the presence of a murmur and isolated basal septal hypertrophy (IBSH). The study population comprised 122 cats. A physical exam, blood pressure measurement, chest radiographs, and echocardiography were performed. A systolic murmur was audible in 39/122 cats. A difference between cats with and without a murmur was found for age (P=0.0001), interventricular basal septal thickness (BIVSd) (P=0.004), AoSA (P=0.003), aortic (P<0.0001), and pulmonic (P=0.021) flow velocity, the presence of IBSH (P<0.0001), and systolic anterior motion of the mitral valve (P=0.0002). More than 50% of cats with a murmur had an AoSA ≤122°. Less than 25% of the cats with an AoSA ≥137° had a murmur. The AoSA narrowed 0.55°/year of age (P<0.001), whereas the BIVSd increased 0.11 mm/year of age (P<0.0001); the BIVSd increased as the AoSA narrowed. In all cats with AoSA < 120°, IBSH was present. This study demonstrates that the probability of having a systolic murmur in cats is increased by the presence of a narrow AoSA. Aging was associated with a narrower AoSA and a thicker basal septum; these findings might represent an age-related heart remodeling.

Antimicrobials are frequently administered for therapeutic and prophylactic purposes in companion animals. Their use is closely monitored as related to antimicrobial resistance both in human and veterinary medicine. This retrospective study aimed to describe antimicrobial prescription by different clinical services in cats visited at the Veterinary Teaching Hospital of the University of Parma (VTH-UP) between January 2021 and December 2023. The antibiotic classes were divided according to the categorization of antibiotics adopted by the European Medicines Agency (EMA); EMA categories A and B were classified as Critically Important Antimicrobials (CIAs). Overall, 43.8%, 35.0%, and 35.0% of visited cats received an antimicrobial prescription in 2021, 2022, and 2023, respectively. Most of the prescriptions were Category C “Caution” antibiotics (49.0%, 54.0%, and 55.0% in 2021, 2022, and 2023, respectively). Category B “restrict” antibiotics represented 13.0%, 12.0%, and 11.0% of the total antimicrobials prescribed in 2021, 2022, and 2023, respectively. Penicillins associated with beta-lactam inhibitors were the most common antibiotics prescribed each year at the VTH-UP (32.0%, 31.3%, and 23.7% of total prescriptions in 2021, 2022, and 2023, respectively). Among CIAs, quinolones were the most common, with 12.1%, 11.2%, and 10.1% of the total prescriptions in 2021, 2022, and 2023, respectively. Culture and sensitivity tests (CSTs) were performed for 18.1% (85/470), 17.4% (73/420), and 23.0% (96/417) of the total prescriptions in 2021, 2022, and 2023, respectively. Considering only CIA prescriptions, CSTs were performed in 70.0% (49/70), 66.7% (38/57), and 70.9% (39/55) of CSTs in 2021, 2022, and 2023, respectively. Antimicrobial use varies considerably depending on the clinical service. The use of “restrict” antibiotics was very limited, and attention should be given to therapeutic and prophylactic use.

A 4-month-old male indoor cat was referred for dyspnea, mental dullness and weakness, which appeared two days earlier. The cat had been adopted at 3 months of age. Physical exam showed cyanosis, dyspnea and mild hypothermia. The “spot test” was supportive of methemoglobinemia. Co-oximetry blood gas analysis revealed severe methemoglobinemia (81.40%), severe hyperchloremia and mild hyponatremia. CBC, biochemistry and urinalysis were within normal limits, blood smear showed the presence of Heinz bodies. Treatment was instituted with oxygen therapy, methylene blue 1% solution, ascorbic acid, intravenous fluid therapy. The clinical course was favorable with rapid improvement of cyanosis and methemoglobinemia (4.2%). Acquired methemoglobinemia was hypothesized. Two weeks after discharge the cat was asymptomatic but mild methemoglobinemia (15.60%) and hyperchloremia were evident. Exposure to oxidants contained in drinking water was suspected so the owners were instructed to use bottled water only. One month later the cat was asymptomatic, and methemoglobinemia and chloremia were within normal limits. Even if a congenital form due to cytochrome b5 reductase deficiency cannot be ruled out, drinking water intoxication is the most likely cause of methemoglobinemia in this cat.