Seguridad de los beta 2 agonistas (B2A) en asma bronquial / Safety of beta-agonists in asthma

Los broncodilatadores beta 2 agonistas (B2A), forman parte muy importante en la farmacoterapia del asma bronquial, enfermedad que avanza en el mundo, de manera epidémica. Los B2A, son prescritos a millones de personas en el mundo, por consiguiente; los aspectos de seguridad son de interés público. Los broncodilatadores B2A de acción corta (Short-Acting B2 Agonists o SABA) como salbutamol inhalatorio, según las evidencias actuales, confirman su seguridad, en su uso como fármaco de rescate o a demanda. Los broncodilatadores B2A de acción prolongada (Long-Acting B2 Agonists o LABA), se utilizan asociados a corticoides inhalatorios, como medicamentos controladores de exacerbaciones de accesos asmáticos, por razones de seguridad los LABAs se usan asociados a corticoides inhalatorios...

Beta 2 agonist bronchodilators (B2A) are very important part in the pharmaco therapy of bronchial asthma, a disease that progresses in the world in an epidemic way. The B2A are prescribed to millions of people around the world, there fore the safety aspects is of public interest. Short-Acting B2 Agonists (SABAs), such as albuterol inhaler, according to current evidence, have confirmed their safety when used as a quick-relief or rescue medication. The long-acting B2 agonists (LABAs) are used associated with inhaled corticosteroids as controller drugs for asthma exacerbations, for safety reasons LABAs are used associated with inhaled corticoid...

Recent advance in inhaler medications for chronic obstructive pulmonary disease patients

Chronic obstructive pulmonary disease (COPD) is one of the highest ranking diseases with regard to prevalence and mortality in Korea and also worldwide. In the past decade, effective inhaler medications for COPD treatment have been developed or approved. These inhaler medications have been proven to have beneficial effects on symptoms, lung function, quality of life, exercise capacity, and exacerbation. The inhalers used widely are long-acting anticholinergics, long-acting beta2-agonists, and combined inhalers of a corticosteroid and long-acting beta2-agonist. These inhaler medications are more effective than oral medications and less likely to produce adverse events. However, the inhaler medications should be used appropriately to achieve the desired effect. For COPD patients with a forced expiratory volume in 1 second (FEV1) less than 80% of the predicted value, a long-acting anticholinergic or long-acting beta2-agonist is usually the medication of first choice. If a COPD patient with a FEV1 less than 60% of the predicted value suffers frequent exacerbations, a combined inhaler of corticosteroid and long-acting beta2-agonist is a good choice. To prescribe an inhaler medication for COPD patients, spirometry should be performed, not only to confirm the diagnosis but also to define severity. These effective inhaler medications should be used widely for COPD patients in Korea.

Potential Masking of Airway Eosinophilic Inflammation by Combination Therapy in Asthma

PURPOSE: Long-acting beta2 agonists (LABA) may mask ongoing bronchial inflammation, leaving asthmatic patients at greater risk of severe complications. The aim of this study was to compare the effect of combination therapy using low-dose inhaled corticosteroids (ICS) plus LABA on airway inflammation in asthma to the effect of medium-dose ICS alone. METHODS: Twenty-four patients with asthma not controlled by low-dose (400 microg per day) budesonide alone were enrolled in this prospective crossover study. Patients were randomized into 2 treatment phases: one receiving medium-dose (800 microg per day) budesonide (ICS phase), and the other receiving a combination therapy of low-dose budesonide/formoterol (360 microg/9 microg per day) delivered by a single inhaler (LABA phase). Each treatment phase lasted for 6 week, after which patients were crossed over. Asthma symptoms, lung function, and airway inflammation were compared between the 2 phases. RESULTS: Twenty-three patients completed the study; adequate sputum samples were collected from 17 patients. Asthma symptoms and lung function remained similar between the 2 phases. However, the mean sputum eosinophil percentage was higher in the LABA phase than in the ICS phase (5.07+/-3.82% vs. 1.02+/-1.70%; P or =3%) was more frequently observed in the LABA phase than in the ICS phase (six vs. two). CONCLUSION: Addition of LABA may mask airway eosinophilic inflammation in asthmatic patients whose symptoms are not controlled with low-dose ICS.

Beta-2 agonistas de ultra longa duração para o tratamento de asma: há espaço? / Ultra long-term beta-2 agonists for treatment of asthma: is there a place?

Objetivos: Revisar a eficácia e a tolerabilidade dos agentes beta-2 agonistas de longa ação (ultra-BALA) em asmáticos. Métodos: Foi conduzida uma revisão sistemática de estudos clínicos que investigaram a eficácia e tolerabilidade de fármacos beta-2 agonistas administrados 1 vez ao dia, por via inalatória para o tratamento de pacientes com diagnóstico de asma brônquica. A pesquisa incluiu todos os manuscritos publicados na íntegra nos últimos 20 anos, na língua inglesa, utilizando as palavras-chaves ultra-long-acting-beta agonits, carmoterol, indacaterol, vilanterol, arfomoterol, bronchodilators, combination therapy, once-daily AND (asthma treatment [Mesh] OR asthma/drug therapy [Mesh] OR bronchial asthma/therapy [Mesh]) AND randomized controlled trial. Resultados: Foram selecionados 8 ensaios clínicos que avaliaram 975 pacientes asmáticos. O indacaterol foi o agente farmacológico que apresentou estudos publicados em fases mais avançadas em asmáticos. Em estudos pré-clínicos e clínicos o indacaterol mostrou boa eficácia, segurança e tolerabilidade. O início de ação broncodilatadora é rápida e duradoura por 24 horas. Os efeitos adversos mais comuns foram tosse, cefaleia e nasofaringite; geralmente mínimos e de leve intensidade. Conclusões: Os fármacos ultra-BALA podem constituir-se em opções promissoras para uso em dose única diária para um subgrupo de asmáticos que apresenta resposta terapêutica insuficiente e baixa aderência ao tratamento.

Objectives: To review the efficacy and tolerability of the ultra- longactingbeta 2 agonists agents (ultra-LABA) in asthmatics. Methods: We conducted a systematic review of clinical studies that investigated the efficacy and tolerability of inhaled beta-2 agonist drugs administered once daily for the treatment of patients with bronchial asthma. The search included all full-length manuscripts published in the last 20 years, in English, by using the keywords ultra-long-acting beta-agonits, carmoterol, indacaterol, vilanterol, arfomoterol, bronchodilators, combination therapy, once-daily AND (asthmatreatment [Mesh] OR asthma/drug therapy [Mesh] OR bronchial asthma/therapy [Mesh]) AND randomized controlled trial. Results: We selected 8 clinical trials that evaluated 975 patients with asthma. Indacaterol was the pharmacological agent that presented published studies at later stages in asthmatics. In preclinical and clinical studies indacaterol showed good efficacy, safety and tolerability. The bronchodilator effect is fast and lasts for 24 hours. The most common adverse events were cough, headache and nasopharyngitis, often minimal or mild. Conclusions: The ultra-LABA can become promising options for a single daily dose regime for a subgroup of patients presenting insuficiente therapeutic response and low adherence to treatment.

<b>On Prescription of Beta 2 Agonists for Pediatric Patients </b><b>with Acute Bronchitis in Japan </b> / 薬剤疫学

<b>Objective: </b>In Japan, beta 2 agonist (BA) has an indication for acute bronchitis with airway obstruction. To investigate BA prescribing practices for children whose diagnosis were acute bronchitis without asthma in Japan, a database study and interviews with pediatricians were conducted.<br><b>Design: </b>Database study<br><b>Methods: </b>We conducted a database study. Using the Japan Medical Data Center database, medical receipts of about 100,000 children younger than 18 years old were obtained between 2005 and 2008. First we identified all the new incidences (362,287 cases) of upper respiratory tract infection, influenza, or acute bronchitis. Outcome measure was prescription of BA within 21 days of the incidence. We calculated the prescription proportions of BA for the asthma group (41,064 cases) and the non-asthma group (321,223 cases). We then interviewed 10 pediatricians to elucidate the reason why they prescribe BA for patients.<br><b>Results: </b>The proportion of children prescribed BA at least once a year in 3-5 years old was 49.9 %. Among 3-5 year olds with acute bronchitis, the BA prescription proportions in the asthma group (58.6%) was nearly as high as that in the non-asthma group (56.6%). Although BA prescription proportions in the asthma group decreased annually with the exception of 0-2 years old, those in the non-asthma group remain unchanged. Based on the interview study, we found interpretations of airway obstruction for acute bronchitis without asthma were broadly-divided into 2 types: the effect of inducing bronchospasm and the effect of producing large amounts of secretions in the airways.<br><b>Conclusion: </b>In this study, it was revealed that pediatric patients with acute bronchitis were commonly prescribed BA in Japan. To promote an appropriate use of BA, prescriptions of BA to non-asthma pediatric patients should be carefully watched. (Jpn J Pharmacoepidemiol 2012; 17(1): 1-12)