Safety of Fluralaner Chewable Tablets Bravecto® in Dogs with Dermatitis–Clinical Pathology Parameters Evaluation

There is a log-linear relation between the dose and duration of action of drugs with single-compartment pharmacokinetics and direct, reversible mechanisms of action. However, it has been suggested that this relation does not extend to drugs whose metabolites are active or slowly eliminated, drugs with saturable kinetics, and drugs with hit-and-run effects. The purpose of this study is to test this hypothesis and to quantify the relationship by way of a systematic review coupled to an empirical analysis. All issues of 4 clinical pharmacology journals from 1980 to 2005 are hand-searched for articles that present pharmacodynamic response versus time curves for 4 or more different doses. Data on duration of action, dose, and area under the plasma concentration versus time curve from zero to infinity (AUC) are abstracted and analyzed by panel data regression modeling, with within-study fixed effects. Duration of drug action is defined as the time during which a pharmacodynamic effect (or response) exceeds a nominal threshold. The generalized models of all observations from 33 publications, with duration of action as the dependent variable and the logarithm of the dose (or AUC) as the explanatory variable, yield significant log-linear relationships. The regressions for individual studies are correctly specified in 27 cases; there are insufficient data for analysis in 10 studies, and a log-linear specification is deemed inappropriate in 6. Analysis of published dose-ranging studies shows that the duration of action of a drug is directly proportional to the logarithm of dose across a wide range of different drugs, extending a result that was previously documented for very few compounds.

During the conduct of in vivo toxicology studies, in-life, clinical pathology, and anatomic pathology parameters are collected and interpreted. These sets of parameters are evaluated in an integrative manner to determine the overall toxicity of a test article. For clinical pathology parameters, the inherent variability and physiologic factors affecting each analyte must be understood prior to interpretation. Changes in clinical pathology parameters that are considered to be test article-related are then assessed with respect to changes in the concurrent data sets such as clinical signs and anatomic pathology to determine the underlying pathophysiology. In this article, examples of hemolysis and hepatotoxicity are used to demonstrate the relationships among the various parameters and data sets. Whereas there was tight correlation of all data sets in the example of hemolysis in rats, the examples of altered enzymes and other biomarkers indicating liver injury and dysfunction were more often discordant with other data sets.

After completing this article, readers should be able to: 1. Describe the pain assessment tools used for preterm and term neonates. 2. List painful procedures in the neonatal intensive care unit (NICU). 3. Describe nonpharmacologic interventions for alleviating neonatal pain. 4. Describe pharmacologic methods used for neonatal analgesia. 5. Delineate the adverse effects of the common forms of pain relief. Neonates are sensitive to pain and vulnerable to both its short- and long-term effects. However, there is a lack of consistency in both attitudes and practices among NICU staff with regard to pain assessment and management in neonates. Recognition of the clinical importance of neonatal pain and stress has been delayed and hampered by the lack of awareness that newborns are capable of experiencing pain, insufficient knowledge about the developing nervous system, difficulty in assessing neonatal pain, lack of evidence for the safety and efficacy of different modalities available for the treatment of pain, and fears about adverse effects associated with analgesic use. Neonatal pain has been of minimal concern until the last 25 years. For example, at one time, neonates were given paralytic drugs without anesthesia for major surgical procedures because physicians believed that neonates were incapable of interpreting or remembering pain. Further, there was no understanding of the consequences of untreated pain. Newer technologies to sustain life have exposed neonates to multiple invasive procedures and prolonged hospital stays that are associated with acute and chronic pain and stress. In 2001, an international evidence-based group for neonatal pain developed guidelines for the assessment, prevention, and treatment of neonatal pain in an effort to standardize practices for physicians and health care facilities. Within the consensus statement, the group defined general principles to prevent and treat pain and listed the most commonly performed diagnostic, therapeutic, and surgical procedures in the NICU. The guidelines also indicated the …

Objective It is well known that the suppression of gastric acidity is one of the most essential factors in promoting healing and preventing relapse of peptic ulcers. Little is known, however, about how to inhibit gastric acid secretion effectively in children with peptic ulcers. The present study aimed at understanding the optimal acid suppression by examining the relationship between ulcer healing and the suppression of gastric acid in children. Methods Patients with peptic ulcers diagnosed by endoscopy were randomized to receive either oral ranitidine (group A) or oral omeprazole (group B) for 4-6 weeks (mean 5 weeks) . Intragastric 24-hour pH monitoring was performed before treatment, and repeated three times: on day 1, weeks 1 and 5 post-dosing. Endoscopy was repeated on week 5 to evaluate the healing condition of ulcers. Results Twenty-seven patients followed up by endoscopy and pH monitoring were eligible for final analysis. The ulcers in 16 patients of group A and in all (11 cases) of group B were healed. No significant differences in the gastric mean pH, median pH and percentage of time with gastric pH > 3 between the two groups were observed before treatment. Gastric pH increased significantly after treatment in both groups. These parameters in group A decreased significantly during weeks 1 and 5 as compared to those on day 1 post-dosing; the duration of drug action was also shortened significantly. The gastric mean pH and mean median pH in group B were significantly higher during weeks 1 and 5than on day 1 of post-dosing, the duration of drug action was also prolonged significantly. According to the result of endoscopic re-examination, the authors subdivided group A into unhealed (group C) and healed (group D) groups. The gastric acid suppressive effect in group C attenuated significantly by the end of the 5-week treatment and the differences of gastric mean pH and median pH, percentage of time with pH > 3 between week 5 and pre-treatment level were not significant. While these parameters in group D were still significantly higher during week 5than those obtained before treatment. The gastric mean pH and median pH, percentage of time with pH > 3 and the duration of drug action during week 5 were significantly higher in group D than in group C. The mean shortest duration of drug action in group B was 10 h, while it was 5 h in group D. Conclusions The onset of tolerance to ranitidine during the therapy might have affected healing of ulcers in the subjects. The optimal acid suppression for healing ulcere in children could be regarded as maintaining the gastric pH > 3 for 5-10 hours a day of post-dosing during 4-6 weeks of anti-secretory treatment. Key words: Peptic ulcer; Hydrogen-ion concentration; Ranitidine; Omeprazole; Drug tolerance

Chewable gel tablets are an underdeveloped subject, even though there are many simple chewable tablets and gummy candies in the food and pharmaceutical industries. Chewable gel tablets are not as sweet, they can have an active substance, pharmacological effect, and a value of nutrition. The aim of this study was to prepare gelatin-based chewable tablets with Myristica fragrans as a preservative and to determine the shelf-life variability depending on storage conditions, and to evaluate texture changes. Firmness and springiness of gel tablets were measured by a texture analyzer and compared between different storage conditions and the shelf-life of tablets was established by mold growing time. Chewable gel tablets were prepared by using silicone form. Mold was most likely to grow on tablets that have been packaged in squeezable bags (after 14 days 60% of all formulations had a mold, p < 0.05). The most stable tablets (over 180 days) were in sealed boxes and contained nutmeg essential oil or its solution, or ethanolic nutmeg extract. The gel tablets’ firmness increased about 4 times when they were stored in opened plastic boxes and their springiness decreased about 1.65 times after 28 days in the mentioned conditions, p < 0.05. Nutmeg hydrolat had the highest influence on texture variation (p < 0.05).

In defence of polypharmacy.

Gene Expression Analysis in Combination with Clinical Parameters Is Effective in Predicting Relapse after Radical Prostatectomy

We asked if tobramycin-loaded calcium sulfate pellets could be used to maintain high local site antibiotic concentrations for an extended period with minimal systemic levels and without adverse effects on vital organs. Calcium sulfate pellets loaded with 10% tobramycin were implanted in contained medullary defects in the proximal humeri of canines. The number of pellets implanted was calculated to yield an equivalent human maximum prescribed dose, and 1.8-fold this dose. These doses converted to approximately 20 mg/kg, and 36 mg/kg, respectively, for the canine. Local and systemic tobramycin levels, pellet resorption, bone response, clinical pathology parameters, and histopathologic responses of potential target organs were analyzed to determine if there was any adverse response for a 28-day period. Serum tobramycin was elevated for less than one day while local levels remained elevated for at least 14 days, and in some animals, 28 days. Tobramycin delivered locally from calcium sulfate pellets had no apparent adverse effect on clinical pathology parameters or on any of the organs that were analyzed. In addition, bone formation and pellet resorption followed patterns typically seen with calcium sulfate materials.

ObjectiveTo integrate the characteristics of intestinal flora and clinical pathological parameters in patients with early colorectal cancer, and to construct and validate a nomogram model for predicting the prognosis of endoscopic therapy.MethodsThe data of 80 patients with early colorectal cancer receiving endoscopic treatment from January 2019 to June 2024 were retrospectively collected. They were randomly divided into a training set (n = 56) and a validation set (n = 24) at a ratio of 7:3. The factors related to prognosis were screened by univariate analysis and multivariate Logistic regression analysis regression, so as to construct Nomogram model, calculate C-index, and draw the calibration curve. The clinical application value of the model was evaluated using decision curve analysis (DCA).ResultsThere was no significant difference in the incidence of poor prognosis, intestinal flora, and clinical pathological parameters between the training set and the validation set (all P>0.05). Multivariate Logistic regression analysis showed that tumor diameter, Shannon-Wiener index, relative abundance of Fusobacterium nucleatum, relative abundance of Bacteroides fragilis, relative abundance of Bifidobacterium, and relative abundance of Lactobacilli were the independent influencing factors for poor prognosis of endoscopic therapy (all P < 0.05). The nomogram prediction model was further constructed, and the nomogram model had good calibration and fitting between prediction and reality in the training set and the validation set. ROC curves were shown in the training set and the validation set; AUC of the nomogram model for predicting the prognosis of endoscopic therapy was 0.979(95% CI: 0. 946-1.000) and 0. 821(95% CI: 0.516-1.000).ConclusionNomogram model based on intestinal flora and clinical pathological parameters can effectively predict the prognosis of early colorectal cancer patients after endoscopic treatment with good accuracy and reliability, which is expected to provide an important reference for the development of clinical individualized treatment plan and guide the accurate treatment and management of patients.

Nonhuman primates are used extensively in a variety of nonclinical safety evaluation studies of new drugs. In those studies, intravenous infusion is a common treatment method, a noninvasivetelemetry system is usually used for cardiovascular safety and pharmacology evaluation, and blood samples are repeatedly collected for various analysis. Intravenous infusion, vest wearing,and repeated intravenous blood collection can caused a stress response in cynomolgus monkeys, which may lead to changes in clinical pathology parameters in them. Here, we aimed to test theeffects of the above operations on clinical pathology parameters in cynomolgus monkeys. Twenty monkeys (10 male/10 female) were administered 0.9% sodium chloride injections via intravenousinfusions on Days 1 and 10. Each animal wore a vest before each dosing, and the vest was removed at 24 h after each dosing. Blood samples were collected before the first dose and at 2 min,24 h, 48 h, 72 h, and 168 h after each dosing. As compared to values before the first dose (D-1) increases in reticulocytes (percentage and absolute count) and decreases in erythrocytes (redblood cells, hemoglobin, and hematocrit) were noted after dosing. The decrease in erythrocytes and increase in reticulocytes were considered to the related to the repeated intravenous bloodcollection. Increases in leukocytes (white blood cells and absolute count and percentage of neutrophils) and platelets (mean platelet volume and platelet distribution width) were noted at 2min or 24 h post dose. Increases in aspartate aminotransferase, direct bilirubin, creatine kinase, C-reactive protein, and human cardiac troponin I and decreases in inorganic phosphate werenoted at 2 min to 72 h post dose.

The terms 'adverse drug effects' and 'adverse drug reactions' are commonly used interchangeably, but they have different implications. Adverse drug reactions arise when a compound (e.g. a drug or metabolite, a contaminant or adulterant) is distributed in the same place as a body tissue (e.g. a receptor, enzyme, or ion channel), and the encounter results in an adverse effect (a physiological or pathological change), which results in a clinically appreciable adverse reaction. Both the adverse effect and the adverse reaction have manifestations by which they can be recognized: adverse effects are usually detected by laboratory tests (e.g. biochemical, haematological, immunological, radiological, pathological) or by clinical investigations (e.g. endoscopy, cardiac catheterization), and adverse reactions by their clinical manifestations (symptoms and/or signs). This distinction suggests five scenarios: (i) adverse reactions can result directly from adverse effects; (ii) adverse effects may not lead to appreciable adverse reactions; (iii) adverse reactions can occur without preceding adverse effects; (iv) adverse effects and reactions may be dissociated; and (v) adverse effects and reactions can together constitute syndromes. Defining an adverse drug reaction as "an appreciably harmful or unpleasant reaction, resulting from an intervention related to the use of a medicinal product" suggests a definition of an adverse drug effect: "a potentially harmful effect resulting from an intervention related to the use of a medicinal product, which constitutes a hazard and may or may not be associated with a clinically appreciable adverse reaction and/or an abnormal laboratory test or clinical investigation, as a marker of an adverse reaction."

A survey of peripheral nerve stimulator (PNS) use

Experimental T-2 toxicosis in swine following inhalation exposure: Clinical signs and effects on hematology, serum biochemistry, and immune response

Nine- to ten-week-old, male castrated, specific pathogen-free derived pigs, weighing 34 to 42 kg, were exposed to a T-2 toxin aerosol (390 micrograms/liter, 1.5 microM mass median aerodynamic diameter) for a time period which allowed an amount equivalent to 8 mg/kg to be nebulized (six pigs). Control animals (five pigs) were exposed to an equivalent amount of the nebulized vehicle. Pigs were immunized subcutaneously with sheep red blood cells on Days 0 and 21. Whole blood and serum samples were taken periodically for clinical pathologic and immunologic studies. Pigs were closely observed, and daily rectal temperatures and weekly weights were measured. The T-2-treated pigs vomited and exhibited cyanosis, anorexia, lethargy, lateral recumbency, slightly elevated rectal temperature, and depressed body weight gain. The lymphocyte count decreased while the neutrophil count increased. The concentrations of total serum protein and hemoglobin declined. There was a marked increase in serum alkaline phosphatase activity on Day 1, followed by a marked and persistent decrease. Mitogen-induced (Con A, PHA, and PWM) blastogenic responses of peripheral blood mononuclear cells and hemagglutination titers to SRBC were also transiently decreased. Thus, inhalation exposure of pigs to a sublethal dose of T-2 toxin caused clinical signs of toxicity and adverse effects on clinical pathologic parameters and immune responses; however, most of these effects were short-lived. The changes described in our study resemble those reported in pigs given T-2 toxin by intravascular injection.

Safety of a topically applied metaflumizone spot-on formulation for flea control in cats and kittens