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1.
Bruno H. Pypendop Kristine T. Siao M.G. Ranasinghe Kirby Pasloske 《Veterinary anaesthesia and analgesia》2018,45(3):269-277
Objective
To determine the effective plasma alfaxalone concentration for the production of immobility in cats.Study design
Prospective up-and-down study.Animals
Sixteen 1–2 year old male castrated research cats.Methods
Cats were instrumented with catheters in a jugular and a medial saphenous vein. Alfaxalone was administered via the medial saphenous catheter, using a target-controlled infusion system. The infusion lasted for approximately 32 minutes. A noxious stimulus (tail clamp) was applied 30 minutes after starting the alfaxalone infusion, until the cat moved or 60 seconds had elapsed, whichever occurred first. The target alfaxalone concentration was set at 5 mg L?1 in the first cat and increased or decreased by 1 mg L?1 in subsequent cats, if the previous cat had moved or not moved in response to stimulation, respectively. This was continued until six independent crossovers (different responses in pairs of subsequent cats) had been observed. Blood samples were collected before alfaxalone administration, and 15 and 31 minutes after starting the administration, for the determination of plasma alfaxalone concentration using liquid chromatography/tandem mass spectrometry. The alfaxalone concentration yielding a probability of immobility in 50% (EC50), 95% (EC95) and 99% (EC99) of the population, and their respective 95% Wald confidence intervals were calculated.Results
The EC50, EC95 and EC99 for alfaxalone-induced immobility were 3.7 (2.4–4.9), 6.2 (4.7–) and 7.6 (5.5–) mg L?1, respectively.Conclusions and clinical relevance
The effective plasma alfaxalone concentration for immobility in cats was determined. This value will help in the design of pharmacokinetic-based dosing regimens. 相似文献2.
Bruno H. Pypendop M.G. Ranasinghe Kirby Pasloske 《Veterinary anaesthesia and analgesia》2018,45(5):630-639
Objectives
To determine the context-sensitive half-time of alfaxalone following intravenous infusions of various durations. To estimate the time necessary for plasma concentration to decrease by up to 95%.Study design
Prospective randomized and simulation studies.Animals
A group of six 1-year-old male castrated research cats.Methods
Cats were instrumented with catheters in a jugular and a medial saphenous vein. Alfaxalone was administered using a target-controlled infusion system, to target a plasma alfaxalone concentration of 7.6 mg L–1. The infusion lasted 30 (n = 2), 60 (n = 2) or 240 (n = 2) minutes. Blood samples were collected prior to drug administration, and at several times during and up to 8 hours after the infusion, for the determination of plasma alfaxalone concentration using liquid chromatography/tandem mass spectrometry. Compartment models were fitted to each time–concentration profile, and a population model was fitted to data from all individuals. The context-sensitive half-time was determined from each individual model. In addition, times for plasma alfaxalone concentration to decrease by 50–95% following bolus administration and target-controlled infusions or continuous rate infusions of 0.5–8 hours were estimated by simulation using the population model.Results
Context-sensitive half-times were 2 and 8, 6 and 9, and 18 and 20 minutes for the 30, 60 and 240 minutes, respectively. Time for plasma alfaxalone concentration to decrease by 90% was predicted to range from 7 to 120 or 113 minutes following a bolus to an 8 hour target-controlled or continuous rate infusion, respectively.Conclusion and clinical relevance
Recovery time from alfaxalone anesthesia in cats is predicted to be influenced by the duration of target-controlled infusion. 相似文献3.
Yael Shilo-Benjamini Bruno H. Pypendop Georgina Newbold Peter J. Pascoe 《Veterinary anaesthesia and analgesia》2017,44(1):178-182
Objective
To determine plasma bupivacaine concentrations after retrobulbar or peribulbar injection of bupivacaine in cats.Study design
Randomized, crossover, experimental trial with a 2 week washout period.Animals
Six adult healthy cats, aged 1–2 years, weighing 4.6 ± 0.7 kg.Methods
Cats were sedated by intramuscular injection of dexmedetomidine (36–56 μg kg?1) and were administered a retrobulbar injection of bupivacaine (0.75 mL, 0.5%; 3.75 mg) and iopamidol (0.25 mL), or a peribulbar injection of bupivacaine (1.5 mL, 0.5%; 7.5 mg), iopamidol (0.5 mL) and 0.9% saline (1 mL) via a dorsomedial approach. Blood (2 mL) was collected before and at 5, 10, 15, 22, 30, 45, 60, 120, 240 and 480 minutes after bupivacaine injection. Atipamezole was administered approximately 30 minutes after bupivacaine injection. Plasma bupivacaine and 3-hydroxybupivacaine concentrations were determined using liquid chromatography–mass spectrometry. Bupivacaine maximum plasma concentration (Cmax) and time to Cmax (Tmax) were determined from the data.Results
The bupivacaine median (range) Cmax and Tmax were 1.4 (0.9–2.5) μg mL?1 and 17 (4–60) minutes, and 1.7 (1.0–2.4) μg mL?1, and 28 (8–49) minutes, for retrobulbar and peribulbar injections, respectively. In both treatments the 3-hydroxybupivacaine peak concentration was 0.05–0.21 μg mL?1.Conclusions and clinical relevance
In healthy cats, at doses up to 2 mg kg?1, bupivacaine peak plasma concentrations were approximately half that reported to cause arrhythmias or convulsive electroencephalogram (EEG) activity in cats, and about one-sixth of that required to produce hypotension. 相似文献4.
Bruno H. Pypendop Juhana Honkavaara Jan E. Ilkiw 《Veterinary anaesthesia and analgesia》2017,44(4):823-831
Objective
To characterize the pharmacokinetics of dexmedetomidine, MK-467 and their combination following intramuscular (IM) administration to cats.Study design
Prospective randomized crossover experimental study.Animals
A total of eight healthy adult male castrated cats aged 1–2 years.Methods
Cats were administered dexmedetomidine (25 μg kg–1) IM (treatment D25IM) or intravenously (IV; treatment D25IV); MK-467 (600 μg kg–1) IM (treatment MK600IM) or IV (treatment MK600IV); or dexmedetomidine (25 μg kg–1) IM with 300, 600 or 1200 μg kg–1 MK-467 IM (treatments D25MK300IM, D25MK600IM and D25MK1200IM). D25MK600IM was the only combination treatment analyzed. Blood samples were obtained prior to drug administration and at various times for 5 hours (D25IV) or 8 hours (all other treatments) thereafter. Plasma dexmedetomidine and MK-467 concentrations were measured using liquid chromatography/mass spectrometry. Compartment models were fitted to the time–concentration data.Results
A one-compartment model best fitted the time–plasma dexmedetomidine concentration data in cats administered D25IM, and the time–plasma MK-467 concentration data in cats administered MK600IM and D25MK600IM. A two-compartment model best fitted the time–plasma dexmedetomidine concentration data in cats administered D25IV and D25MK600IM, and the time–plasma MK-467 concentration data in cats administered MK600IV. Median (range) area under the time–concentration curve, absorption rate half-life, maximum concentration, time to maximum concentration and terminal half-life for dexmedetomidine in D25IM and D25MK600IM were 1129 (792–1890) and 924 (596–1649) ng minute mL–1, 4.4 (0.4–15.7) and 2.3 (0.2–8.0) minutes, 10.2 (4.8–16.9) and 17.8 (15.8–73.5) ng mL–1, 17.8 (2.6–44.9) and 5.2 (1.2–15.1) minutes and 62 (52–139) and 50 (31–125) minutes, respectively. Rate of absorption but not systemic exposure was significantly influenced by treatment. No significant differences were observed in MK-467 pharmacokinetic parameters in MK600IM and D25MK600IM.Conclusions and clinical relevance
MK-467 significantly influenced the disposition of dexmedetomidine, whereas dexmedetomidine did not significantly affect the disposition of MK-467 when the drugs were coadministered IM. 相似文献5.
Ilaria Spalla Jessie Rosie Payne Kieran Borgeat Virginia Luis Fuentes David John Connolly 《Journal of Veterinary Cardiology》2018,20(3):154-164
Introduction
Hypertrophic cardiomyopathy (HCM) has a variable prognosis; left atrial size, presence of clinical signs and left ventricular systolic function have been shown to predict outcomes. Mitral annular plane systolic excursion (MAPSE) and tricuspid annular plane systolic excursion (TAPSE) assess longitudinal ventricular systolic function and are decreased in cats with HCM. The aim of the study was to ascertain whether MAPSE and TAPSE have prognostic value in HCM and if cats with pleural effusion have lower MAPSE and TAPSE than cats with pulmonary oedema.Animals
One hundred eighty-four client-owned cats diagnosed with HCM.Methods
This is a retrospective study. Echocardiography was used to diagnose HCM (end-diastolic left ventricular wall thickness ≥ 6 mm) and to measure MAPSE and TAPSE. Survival information was obtained.Results
No multivariable model including MAPSE or TAPSE could be generated in this population. Cats with pleural effusion ± pulmonary oedema had lower MAPSE measured at the interventricular septum (MAPSE IVS) and TAPSE, compared with cats with pulmonary oedema only. MAPSE IVS was the only factor predicting pleural effusion on multivariable regression model.Conclusions
Lower MAPSE and TAPSE were not independently associated with outcomes on multivariable analysis. Cats with pleural effusion ± pulmonary oedema had lower TAPSE and MAPSE IVS than cats with pulmonary oedema, and MAPSE IVS was the only predictive factor associated with the development of pleural effusion in this population. 相似文献6.
Bruno H. Pypendop M.G. Ranasinghe Kirby Pasloske 《Veterinary anaesthesia and analgesia》2018,45(4):459-466
Objective
To compare the performance of an alfaxalone constant rate intravenous (IV) infusion versus a 3-step IV infusion, both following a loading dose, for the maintenance of a target plasma alfaxalone concentration of 7.6 mg L–1 (effective plasma alfaxalone concentration for immobility in 99% of the population) in cats.Study design
Prospective randomized crossover study.Animals
A group of six healthy, adult male neutered cats.Methods
Catheters were placed in a jugular vein for blood sampling and in a medial saphenous vein for drug administration. An IV bolus of alfaxalone (2 mg kg–1) was administered, followed by either 0.2 mg kg?1 minute?1 for 240 minutes (single infusion; SI) or 0.4 mg kg?1 minute?1 for 10 minutes, then 0.3 mg kg?1 minute?1 for 30 minutes, and then 0.2 mg kg?1 minute?1 for 200 minutes (3-step infusion; 3-step). Plasma alfaxalone concentration was measured at six time points during the infusions. Measures of performance were calculated for each infusion regimen and compared using the paired Wilcoxon signed-rank test.Results
Median (range) absolute performance error, divergence, median prediction error and wobble were 15 (8–19)%, ?8 (?12 to ?6)% hour?1, ?12 (?19 to ?7)% and 10 (8–19)%, respectively, in the SI treatment, and 6 (2–16)%, 0 (?13 to 2)% hour?1, 1 (?16 to 4)% and 4 (3–6)% respectively, in the 3-step treatment and were significantly smaller in the 3-step treatment than in the SI treatment.Conclusion and clinical relevance
After IV administration of a bolus dose, a 3-step infusion regimen can better maintain stable plasma alfaxalone concentrations close to the target concentration than a single constant rate infusion. 相似文献7.
R.D. Baumwart A.S. Hanzlicek S.D. Lyon P.M. Lee 《Journal of Veterinary Cardiology》2017,19(5):416-420
Objective
To determine if concentrations of plasma N-terminal pro-brain natriuretic peptide (NT-proBNP) are increased in dogs with cardiac tamponade and if there is a significant increase in plasma NT-proBNP after pericardiocentesis.Animals
Ten client-owned dogs with spontaneous cardiac tamponade.Methods
Prospective clinical study. Cardiac tamponade was suspected from physical examination and confirmed with echocardiography. Blood was collected and plasma NT-proBNP concentrations were measured before and 30–60 min following pericardiocentesis and resolution of cardiac tamponade. Within-subject changes in plasma NT-proBNP were compared by the Wilcoxon signed-rank test.Results
The plasma NT-proBNP concentrations measured within the reference interval in seven of 10 dogs before pericardiocentesis and in six of 10 dogs following pericardiocentesis. Following pericardiocentesis, there was a statistically significant increase in median NT-proBNP concentration (733 pmol/L, range 250–3,297) compared with the values measured before (643 pmol/L, range 250–3,210, P = 0.004). The NT-proBNP concentration increased in 90% of the dogs following pericardiocentesis.Conclusions
An upper reference limit of 900 pmol/L for plasma NT-proBNP is insensitive for the diagnosis of pericardial effusion and cardiac tamponade in dogs. Plasma NT-proBNP concentration commonly increases following pericardiocentesis, perhaps related to improved ventricular filling and stretch. 相似文献8.
Background
False tendons (FTs) are string-like structures in the left ventricle. A FT might produce focal thickening at its insertion region of the left ventricle, which could be mistaken for focal hypertrophic cardiomyopathy.Objectives
To perform a prospective, echocardiographic follow-up examination of feline FTs and compare the wall thickness at the FT insertion region and a normal region without FTs at both examinations.Animals
One hundred twenty-eight cats with one or multiple FTs without other cardiac abnormalities or systemic disease.Methods
Measurements of the interventricular septum at end-diastole at a region with and without FT insertion were performed using two-dimensional echocardiography at both examinations and compared statistically using a Student's t-test.Results
The follow-up interval ranged from 5 to 110 months (mean, 33 months). Myocardial wall segments with FT insertions were significantly thicker compared with neighboring wall regions in the long axis, but not in the short-axis views obtained. Comparing the wall thickness of follow-up examinations with the initial examination, revealed a significant growth of both FT and non-FT segments. However, differences in growth between the FT region and region without FTs were not statistically different.Conclusions and clinical importance
Many normal cats have FTs, associated with focal thickening compared with neighboring regions. This thickening can increase over time, proportionate to growth in other (non-FT) segments. The association of such thickening with an FT and the absence of disproportionate growth in this segment over time suggests that these segments are simply thicker related to FT insertion. 相似文献9.
Bruno H. Pypendop Juhana Honkavaara Jan E. Ilkiw 《Veterinary anaesthesia and analgesia》2017,44(1):52-62
Objective
To characterize the cardiovascular effects of dexmedetomidine, with or without MK-467, following intravenous (IV) administration in cats.Study design
Prospective Latin square experimental study.Animals
Six healthy adult purpose-bred cats.Methods
Cats were anesthetized with desflurane in oxygen for instrumentation with a carotid artery catheter and a thermodilution catheter in the pulmonary artery. One hour after discontinuation of desflurane, cats were administered dexmedetomidine (25 μg kg–1), MK-467 (600 μg kg–1), or dexmedetomidine (25 μg kg–1) and MK-467 (600 μg kg–1). All treatments were administered IV as a bolus. Cardiovascular variables were measured prior to drug administration and for 8 hours thereafter. Only data from the dexmedetomidine and dexmedetomidine–MK-467 treatments were analyzed.Results
Dexmedetomidine produced significant decreases in heart rate, cardiac index and right ventricular stroke work index, and significant increases in arterial blood pressure, central venous pressure, pulmonary artery pressure and systemic vascular resistance index. Dexmedetomidine combined with MK-467 resulted in significant but transient decrease in blood pressure and right ventricular stroke work index.Conclusion and clinical relevance
Following IV co-administration, MK-467 effectively attenuated dexmedetomidine-induced cardiovascular effects in cats. The drug combination resulted in transient reduction in arterial blood pressure, without causing hypotension. 相似文献10.
Marja R. Raekallio Marika Virtanen Irmeli Happonen Outi M. Vainio 《Veterinary anaesthesia and analgesia》2017,44(4):803-810
Objective
To describe suspected adverse drug reactions in cats associated with use of α2-adrenoceptor agonists.Study design
Retrospective study.Animals
A total of 90 cats.Methods
Data were collected from reports on adverse reactions to veterinary medicines sent to the Finnish Medicines Agency during 2003–2013. All reports of suspected adverse reactions associated with use of α2-adrenoceptor agonists in cats were included. Probable pulmonary oedema was diagnosed based on post mortem or radiological examination, or presence of frothy or excess fluid from the nostrils or trachea. If only dyspnoea and crackles on auscultation were reported, possible pulmonary oedema was presumed.Results
Pulmonary oedema was suspected in 61 cases. Of these cats, 37 were categorised as probable and 24 as possible pulmonary oedema. The first clinical signs had been noted between 1 minute and 2 days (median, 15 minutes) after α2-adrenoceptor agonist administration. Many cats probably had no intravenous overhydration when the first clinical signs were detected, as either they presumably had no intravenous cannula or the signs appeared before, during or immediately after cannulation. Of the 61 cats, 43 survived, 14 died and for four the outcome was not clearly stated.Conclusions and clinical relevance
Pulmonary oedema is a perilous condition that may appear within minutes of an intramuscular administration of sedative or anaesthetic agent in cats. The symptoms were not caused by intravenous overhydration, at least in cats having no venous cannula when the first clinical signs were detected. 相似文献11.
Objective
Measurement of sensory thresholds could represent a complementary tool to behavioural pain scores in cats. The aim of this study was to investigate the feasibility of quantitative sensory testing (QST) with the Electronic von Frey Anesthesiometer (EVF) and von Frey filaments (VFF) in healthy cats, and to assess the limits of agreement (LOA) between the two devices.Study design
Prospective clinical study.Animals
A total of 15 client-owned healthy cats.Methods
Two investigators (A and B) carried out the measurements independently. The EVF and the VFF were applied on the upper lip and at the level of the medial aspect of the stifle. A 1-hour interval was allowed between the sets of measurements taken by investigators A and B; each investigator repeated the entire session of measurements after 24 hours. The LOA between the EVF and the VFF were analysed with the intraclass correlation coefficient (ICC), and with the Bland Altman method.Results
QST with both the EVF and the VFF was feasible in healthy cats; however, the willingness of the cats to cooperate was negatively affected by the repetition of the measurements on the second day. The presence of the cat owners seemed to facilitate the trial. There was a fair agreement between the EVF and the VFF (ICC = 0.49; 95% confidence interval: 0.13–0.70).Conclusions
and clinical relevance Our findings indicate that both EVF and VFF may be used for QST in cats. Further trials will be needed to verify the usefulness of QST with EVF and VFF in feline patients suffering from actual chronic pain. 相似文献12.
Niwako Ogata Teppei Kanda Mizuki Kawahata Takayasu Ichikawa Yuki Matsumoto Waka Morimitsu Yukiko Nishino Takamasa Itoi Kayo Furumoto 《Veterinary anaesthesia and analgesia》2017,44(5):1091-1100
Objective
To determine the effects of brimonidine tartrate ophthalmic solution on sedation, heart rate (HR), respiratory frequency (fR), rectal temperature (RT) and noninvasive mean arterial pressure (MAP) in healthy cats.Study design
Randomized, blinded crossover study, with 1 week washout between treatments.Animals
Six healthy purpose-bred cats.Methods
Brimonidine tartrate ophthalmic solution 0.1% (one or two drops; 58.6 ± 3.3 μg per drop) or a control solution (artificial tear solution) was administered to six healthy cats. Behavioural observations and measurements of HR, fR, RT and MAP were recorded before and at 30, 60, 90, 120, 180, 240, 300 and 360 minutes after topical administration. Behavioural scores were analysed using Friedman’s test for repeated measures to evaluate the time effect in each treatment and treatment effect at each time point. Physiological variables (HR, fR, RT and MAP) were analysed using two-way analysis of variance for repeated measures to evaluate the time and treatment effects. The level of significance was set at p < 0.05.Results
Dose-dependent behavioural and physiological responses were noted. A dose of two drops of brimonidine resulted in sedation in the cats and decreased HR and MAP. Significant sedative effects occurred between 30 and 120 minutes and for physiological responses up to 360 minutes. The most frequent adverse reaction was vomiting, occurring within 40 minutes in all six cats administered two drops and five of the six cats administered one drop of brimonidine.Conclusions and clinical relevance
The results demonstrated that ocular administration of brimonidine 0.1% ophthalmic solution induced sedation in cats and some cardiovascular effects usually associated with α2-adrenoceptor agonists. Further studies should be performed to determine clinical applications for this agent in cats. 相似文献13.
K. Höglund J. Häggström S. Hanås A.-C. Merveille V. Gouni M. Wiberg J. Lundgren Willesen K.Mc Entee L. Mejer Sørensen L. Tiret E.H. Seppälä H. Lohi V. Chetboul M. Fredholm A.-S. Lequarré I. Ljungvall 《Journal of Veterinary Cardiology》2018,20(4):244-253
Introduction
Serotonin (5-hydroxytryptamine [5-HT]) has several biological functions. In different species, excessive 5-HT has been linked to valvular lesions, similar to those seen in dogs with myxomatous mitral valve disease. Previous studies suggest higher 5-HT in healthy Cavalier King Charles Spaniels (CKCSs), a breed highly affected by myxomatous mitral valve disease, compared to other breeds.Objective
To investigate potential interbreed variation in serum 5-HT in healthy dogs.Animals
483 healthy dogs of nine breeds aged 1–7 years.Methods
Dogs were examined at five European centers. Absence of cardiovascular, organ-related, or systemic diseases was ensured by thorough clinical investigations including echocardiography. Serum was frozen and later analyzed by enzyme-linked immunosorbent assay (ELISA).Results
Median 5-HT concentration was 252.5 (interquartile range = 145.5–390.6) ng/mL. Overall breed difference was found (p<0.0001), and 42% of pairwise breed comparisons were significant. Univariate regression analysis showed association between serum 5-HT concentration and breed, center of examination, storage time, and sex, with higher 5-HT in females. In multiple regression analysis, the final model had an adjusted R2 of 0.27 with breed (p<0.0001), center (p<0.0001), and storage time (p=0.014) remaining significant. Within centers, overall breed differences were found at 3/5 centers (p≤0.028), and pairwise comparisons within those centers showed breed differences in 42% of comparisons. Among the included breeds, Newfoundlands, Belgian Shepherds and CKCSs had highest 5-HT concentrations.Conclusions
Interbreed variation in serum 5-HT concentration was found in healthy dogs aged 1–7 years. These differences should be taken into account when designing clinical studies. 相似文献14.
G. Romito C. Guglielmini M.O. Mazzarella M. Cipone A. Diana B. Contiero M. Baron Toaldo 《Journal of Veterinary Cardiology》2018,20(5):364-375
Objectives
To assess the ability of electrocardiography (ECG) to predict left ventricular hypertrophy (LVH) in the cat and to investigate the prognostic value of selected ECG variables in cats with LVH.Animals
Fifty-seven privately owned cats: 22 clinically healthy cats and 35 cats with LVH.Material and methods
This is a clinical cohort study. Echocardiographic diagnosis and surface ECG were available. Electrocardiography analysis included rhythm diagnosis and specific electrocardiographic measurements. In cats with LVH, cause of death and outcome data were recorded and analyzed using Kaplan–Meier curves.Results
The presence of arrhythmia had sensitivity and specificity of 31% and 100%, respectively, for identifying LVH. Among ECG measurements, duration of QT interval (QT) and QT interval corrected for heart rate (QTc) was statistically different between healthy cats and cats with LVH (p = 0.007). Overall, the most accurate cutoffs to identify LVH were QT > 170 ms (sensitivity and specificity 48.3% and 91%, respectively) and QTc > 188 ms (sensitivity and specificity 62% and 77%, respectively). In healthy cats, the highest QT and QTc values were 180 ms and 200 ms, respectively. Mean survival time was 58 days and indeterminable for cats with QT > 180 ms and QT ≤ 180 ms, respectively (p = 0.042) and 125 days and indeterminable for cats with QTc > 200 ms and QTc ≤ 200 ms, respectively (p = 0.017).Conclusions
Arrhythmias as well as prolonged QT and QTc are useful ECG parameters in identifying LVH and predicting survival in affected cats. 相似文献15.
Olivier L. Levionnois Claudia Graubner Claudia Spadavecchia 《Veterinary anaesthesia and analgesia》2018,45(6):876-880
Objective
To investigate the pharmacological profile and side effects of buprenorphine administered as a sustained-release formulation in horses.Study design
Pilot trial.Animals
A total of four experimental horses, aged 18–27 years and weighing 508–578 kg.Methods
Buprenorphine (0.1 mg kg–1) was mixed as a freshly prepared sterile solution with a sustained-release drug carrier. It was administered by the subcutaneous (n = 2) or intramuscular (n = 2) route. During the experiment, the horses were closely monitored, equipped with a step counter and blood samples were collected for quantification of buprenorphine in plasma.Results
All four horses developed colon constipation requiring medical therapy, together with increased locomotor activity. One horse, requiring surgical treatment of colon constipation, was euthanized during recovery from anaesthesia for weakness and severe lower airway obstruction. The three other horses recovered fully within 5–7 days. Plasma buprenorphine concentrations were between 1 and 8 ng mL–1 for approximately 48 hours. No local reaction was observed at the injection sites.Conclusions and clinical relevance
Administration of the sustained-release formulation of buprenorphine at a dose of 0.1 mg kg–1 resulted in plasma concentrations compatible with antinociceptive activity for at least 48 hours. The observed severe and undesirable effects of colon constipation and increased locomotor activity definitely preclude clinical use of sustained-release buprenorphine at this dose. 相似文献16.
Introduction
Diuretic failure is a potential life-ending event but is unpredictable and poorly understood. The objectives of this study were to evaluate pharmacodynamic markers of furosemide-induced diuresis and to investigate mechanisms of diuretic braking in dogs receiving constant rate infusion (CRI) of furosemide.Animals
Six healthy male dogs.Methods
Raw data and stored samples from one arm of a previously published study were further analyzed to mechanistically investigate causes of diuretic braking in these dogs. Urine volume was recorded hourly during a 5-h furosemide CRI. Urine and blood samples were collected hourly to measure serum and urine electrolytes, urine aldosterone, and plasma and urine furosemide. Serum electrolyte fractional excretion was calculated. Urine sodium concentration was indexed to urine potassium (uNa:uK) and urine furosemide (uNa:uFur) concentrations, plasma furosemide concentration was indexed to urine furosemide concentration (pFur:uFur), and urine aldosterone was indexed to urine creatinine (UAldo:C). Temporal change and the relationship to urine volume were evaluated for these measured and calculated variables.Results
Urine volume was significantly correlated with urine electrolyte amounts and with uNa:uK. The ratio of pFur:uFur decreased during the infusion, whereas furosemide excretion was unchanged.Conclusions
There was a strong relationship between urine volume and absolute urine electrolyte excretion. Urine volume was strongly correlated to uNa:uK, giving it potential as a spot indicator of urine production during diuresis. The decrease in uNa:uK over time during the infusion is consistent with mineralocorticoid modification of urinary electrolyte excretion, supporting renin–angiotensin–aldosterone activation as a cause of diuretic braking in this model. 相似文献17.
X. Roura G. Santamarina M-D. Tabar O. Francino L. Altet 《Journal of Veterinary Cardiology》2018,20(4):267-275
Objectives
The presence of Bartonella spp. was detected by polymerase chain reaction (PCR) in dogs from Spain with blood culture-negative endocarditis. The aim of this study is to add information about canine infectious endocarditis in Europe.Animals
Thirty dogs with naturally occurring blood culture-negative endocarditis were examined from 2010 to 2017 at three veterinary referral hospitals, located in northwest, northeast, and southeast of Spain.Methods
It is a retrospective study. Medical records were reviewed to extract relevant data. Frozen or paraffin-embedded cardiac valve tissue and/or ethylenediamine tetraacetic acid blood samples were evaluated by PCR for the presence of Bartonella DNA. Positive results were sequenced to confirm the species.Results
Polymerase chain reaction was positive for eight out of 30 dogs included (26.6%). Bartonella rochalimae, Bartonella vinsonii subsp. berkhoffii, and Bartonella koehlerae were detected in valve tissue or blood.Conclusions
Bartonella could be an important cause of blood culture-negative infectious endocarditis in dogs from Spain. The outcome for those dogs affected with Bartonella spp. was grave. Prompt empirical treatment with amoxicillin-clavulanate plus fluoroquinolones could be of value in cases of blood culture-negative endocarditis. 相似文献18.
Introduction
An important aspect of heart failure is the progressive ineffectiveness of the salutary natriuretic peptide system and its secondary messenger, 3′,5′-cyclic guanosine monophosphate (cGMP). In humans with acute heart failure, administration of exogenous natriuretic peptide is associated with improvement in clinical signs and reduction of cardiac filling pressures. This study aimed to determine the feasibility, tolerance, and safety of subcutaneous (SC) synthetic canine B-type natriuretic peptide (syncBNP) administration in dogs.Animals
Six privately owned dogs.Materials and methods
Dogs were enrolled in a modified 3 + 3 phase I trial. Three dogs initially received doses of 2.5 and 5 μg/kg SC syncBNP followed by an additional three dogs dosed at 5 and 10 μg/kg. Hemodynamic monitoring was performed for 120 min after each injection. Blood and urine samples were collected at 45 and 120 min after injection of 5 μg/kg. Major adverse clinical events that would potentially halt testing were pre-defined.Results
Four healthy dogs and two dogs with stage B1 mitral valve disease were recruited. Synthetic canine B-type natriuretic peptide was well tolerated at all doses. Synthetic canine B-type natriuretic peptide at 5 μg/kg significantly increased median plasma cGMP (baseline cGMP, 131.5 pmol/mL [range, 91.9–183.6 pmol/mL]; 45 min, 153.6 pmol/mL [140.3–214.3 pmol/mL]; 120 min, 192.7 pmol/mL [139.1–240.1 pmol/mL]; p=0.041).Discussion and conclusions
We report for the first time administration of syncBNP in privately owned dogs. Administration of SC syncBNP was feasible, well tolerated, safe, and increased plasma cGMP concentration. Further studies using exogenous syncBNP for treatment of heart disease are warranted. 相似文献19.
I. Biasato E. Biasibetti S. Gili G. Bruatto A. Tarducci F. Guarda M.T. Capucchio 《Journal of Veterinary Cardiology》2017,19(1):68-73
Objectives
Right atrial aneurysms have been reported in bovine species, but a clear aetiopathogenesis has never been elucidated.Animals
One thousand and seventy-nine veal calves (6–9 months old) and 313 beef cattle (10–24 months old) housed in intensive livestock farming systems and regularly slaughtered were included in the present study.Methods
Hearts were externally examined and the identified right atrial aneurysms were submitted for gross and histopathological investigations.Results
Right atrial aneurysms, which involved the right auricle, were detected in both veal calves (4.63%) and beef cattle (8.63%). Two types of aneurysms were observed: one type showing communications with the atrial lumen, the other one having no connections with it. Aneurysms communicating with the atrial lumen were characterized by endocardial fibrosis, whereas the other ones showed arterial characteristics (intimal fibromuscular hyperplasia and medial elastic fibre and fibrous tissue deposition).Conclusions
Considering the similarities with the right atrial aneurysms reported in people, the aneurysms communicating with the atrial lumen were considered to be caused by an inherent atrial weakness (so called ‘loci minoris resistentiae’ areas). On the contrary, the aneurysms with no communications with the atrial lumen, whose localization suggested an origin from the intramural coronary arteries of the pectinate muscles, may be subsequent to systemic hypertension due to intensive livestock farming conditions. 相似文献20.
A. Bascu?án K.M. Thieman Mankin A.B. Saunders J.M. Bright V. Scharf A. Singh L. O&#x;Sullivan B. Brisson A.H. Estrada S.P. Tou C. Ruoff 《Journal of Veterinary Cardiology》2017,19(1):35-43