[Experience with montelukast, a leukotriene receptor antagonist, in pediatric patients with asthma]

[Article in Spanish]

Jimenez Ferral R.

Facultad de Medicina de Tampico, Universidad Autonoma de Tamaulipas.

BACKGROUND: Montelukast is a specific antagonist of leukotrienes' receptors and constitutes a therapeutic option in controlling asthma. OBJECTIVES: To evaluate efficacy of montelukast in patients with persistent light asthma, persistent moderate asthma and exercise-induced asthma; to try to reduce or to eliminate doses of inhaled steroid; to reduce the use of short-action beta agonists and to assess its tolerability in pediatric patients. MATERIAL AND METHOD: 40 patients were studied, 17 female, with an age range from 4 to 11 years and a mean of 7 years. Stratification was made by GINA-established parameters. RESULTS: Steroid dose could be reduced in 88%, with definitive suspension in 66% of patients. Moreover, an improvement in reducing asthma stratification and the use of rescue drugs were registered. 62% of patients with exercise-induced asthma improved and there was a good tolerance with the same side effects.

Online pharmacy ref source: www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=11759254&dopt=Abstract montelukast, Singulair




Adherence to oral montelukast and inhaled fluticasone in children with persistent asthma.

Hendeles L.

Department of Pediatrics, University of Florida, Gainesville, USA. shermjm peds.ufl.edu

STUDY OBJECTIVE: To evaluate adherence to oral montelukast and inhaled fluticasone in children with persistent asthma and to determine if age, monotherapy, and duration of therapy affect adherence. DESIGN: Retrospective analysis. SETTING: Pediatric pulmonary clinic. PATIENTS: One hundred seventy-one children with asthma who required continuous treatment with a controller agent year-round and in whom montelukast and/or fluticasone had been prescribed for at least 90 days. INTERVENTION: Montelukast monotherapy had been prescribed for 54 patients, fluticasone monotherapy for 48 patients, and combination therapy for 69 patients. MEASUREMENTS AND MAIN RESULTS: Prescription refill histories were obtained from pharmacies identified by the parents or from Medicaid pharmacy reimbursement records. The maximum possible adherence was calculated as [(no. of doses refilled)/(no. of doses prescribed)] x 100, for a mean observation period of 203 days (range 84-365 days) for montelukast and 314 days (range 97-365 days) for fluticasone. Median adherence rates were 59% (95% confidence interval [CI] 48-65%) for montelukast and 44% (90% CI 35-50%) for fluticasone. Adherence did not significantly correlate with age, length of observation period, or whether the patient was receiving monotherapy or combination therapy. The odds ratio for very poor adherence (< 50%) was 2.0 (95% CI 1.3-3.2) for fluticasone relative to montelukast. CONCLUSIONS: Adherence to both drugs was suboptimal. However, these data indicate that our patients were likely to take montelukast more consistently than fluticasone. Whether this translates into better asthma control requires further study.

Online pharmacy ref source: www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=11765298&dopt=Abstract montelukast, Singulair




Montelukast and improvement of eczema: observations from a prescription event monitoring study in England.

Shakir SA.

Drug Safety Research Unit, Southampton, Hants, UK. pipasha.biswas dsru.org

OBJECTIVE: Montelukast is an orally administered cysteinyl receptor antagonist, approved for the treatment of asthma. There is pharmacological plausibility of its effectiveness in the treatment of other immunologically mediated conditions such as eczema and urticaria. The objective of this study was to determine whether there are any beneficial effects of montelukast on eczema and urticaria. METHOD: A non-interventional observational cohort study was conducted between February 1998 and December 1998 using Prescription-Event Monitoring (PEM). During PEM studies, patients are systematically identified from dispensed prescription data and questionnaires are sent to the prescribing general practitioner (GP) asking them to report events occurring during and after treatment. In this study, events reported as eczema or urticaria improved were identified. A simple questionnaire was sent to the GPs for additional information. RESULTS: The cohort comprised 15,612 patients, in which 16 reports of eczema or urticaria improved were identified. Questionnaires were sent to the GPs for additional information. Fifteen of the 16 questionnaires were returned. In 5 cases the GPs thought that there was an improvement of eczema or urticaria with montelukast treatment in patients who had history of longstanding eczema or urticaria. Of the remaining 11 cases there was an alternative explanation for the improvement of eczema or urticaria in 10 cases and one was unassessable. CONCLUSION: PEM is conducted to monitor the safety of medicines, and doctors report events including improvement in pre-existing conditions. Although the number of cases of improvement of eczema or urticaria in this cohort is small, there is a possibility that leukotriene inhibitors may be helpful in the treatment of these diseases. Further studies are needed to provide evidence as to whether montelukast will have a role in the treatment of these conditions.

Online pharmacy ref source: www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=11770833&dopt=Abstract montelukast, Singulair




A role for cysteinyl leukotrienes in airway remodeling in a mouse asthma model.

Chi EY.

Departments of Medicine and Pathology, University of Washington, Seattle, Washington 98195-6523, USA.

Airway inflammation and remodeling in chronic asthma are characterized by airway eosinophilia, hyperplasia of goblet cells and smooth muscle, and subepithelial fibrosis. We examined the role of leukotrienes in a mouse model of allergen-induced chronic lung inflammation and fibrosis. BALB/c mice, after intraperitoneal ovalbumin (OVA) sensitization on Days 0 and 14, received intranasal OVA periodically Days 14-75. The OVA-treated mice developed an extensive eosinophil and mononuclear cell inflammatory response, goblet cell hyperplasia, and mucus occlusion of the airways. A striking feature of this inflammatory response was the widespread deposition of collagen beneath the airway epithelial cell layer and also in the lung interstitium in the sites of leukocytic infiltration that was not observed in the saline-treated controls. The cysteinyl leukotriene(1) (CysLT(1)) receptor antagonist montelukast significantly reduced the airway eosinophil infiltration, mucus plugging, smooth muscle hyperplasia, and subepithelial fibrosis in the OVA-sensitized/challenged mice. The presence of Charcot-Leyden-like crystals in airway macrophages and the increased interleukin (IL)-4 and IL-13 mRNA expression in lung tissue and protein in BAL fluid seen in OVA-treated mice were also inhibited by CysLT(1) receptor blockade. These data suggest an important role for cysteinyl leukotrienes in the pathogenesis of chronic allergic airway inflammation with fibrosis.

Online pharmacy ref source: www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=11779739&dopt=Abstract montelukast, Singulair




Economic impact of asthma therapy with fluticasone propionate, montelukast, or zafirlukast in a managed care population.

Stanford RH.

Center for Health Outcomes, Policy, and Evaluation Studies, College of Medicine and Public Health, The Ohio State University, Columbus 43210-1234, USA.

STUDY OBJECTIVE: To compare asthma-related health care expenditures among patients newly prescribed fluticasone propionate 44 or 110 microg, montelukast 5 or 10 mg, or zafirlukast 20 mg. DESIGN: Retrospective cohort analysis of medical and pharmacy claims. SETTING: University-affiliated health outcomes research center. PATIENTS: Seven hundred eighty-one patients (aged > or = 4 yrs) with asthma treated with controller therapy for 9 months (postindex period), with no claim for an inhaled corticosteroid or leukotriene modifier in the previous 9 months (preindex period). INTERVENTION: Asthma-related medical and pharmacy data from insurance claims of four managed care plans (two Northeastern, one Midwestern, and one Western) were tabulated over the pre- and postindex periods. MEASUREMENTS AND MAIN RESULTS: Numbers of patients identified were 284 beginning fluticasone propionate; 302, montelukast; and 195, zafirlukast. Fluticasone propionate treatment was associated with significantly (p<0.001) lower risk-adjusted asthma-related charges compared with montelukast and zafirlukast treatment: $528, $967, and $1359, respectively In this cohort, fluticasone propionate also was associated with fewer hospitalizations, less need for additional controller agents, and longer maintenance on the index drug compared with montelukast and zafirlukast. CONCLUSIONS: Based on these real-world data, as well as established national and international asthma guidelines, consideration should be given to inhaled corticosteroid therapy, particularly fluticasone propionate, for first-line, long-term effective management of asthma.

Online pharmacy ref source: www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=11837555&dopt=Abstract montelukast, Singulair