Cromolyn, Nedocromil, Theophylline: Asthma Medications

asthma medications
Cromolyn sodium and nedocromil sodium are inhaled agents that are alternatives to inhaled corticosteroids (ICS) in the management of mild persistent asthma in children. Both drugs have been shown to possess anti inflammatory properties through nonsteroidal mechanisms, although the exact mechanisms for their actions remain unclear. (more…)

Long Acting Agonist (ß2) Therapy to Inhaled Corticosteroids in Persistent Asthma?

long acting agonist
Current internationally recognized guidelines indicate that symptomatic asthmatics using a low to medium inhaled corticosteroid dose (400–800 µg/day of beclomethasone or equivalent) alone should preferentially be commenced on a long-acting agonist ß2 prior to an leukotriene receptor antagonists LTRA (British guideline on the management of asthma 2003; GINA Workshop Report 2004). However, two recent large trials have performed head to-head comparisons of add-on long-acting ß2 agonist versus LTRA as therapeutic adjuncts to inhaled corticosteroids, using exacerbation frequency (rather than lung function and symptoms) as the primary end point. (more…)

Omalizumab Benefits for Severe Persistent Asthma Therapy

Patients with severe persistent asthma who are inadequately controlled despite Global Initiative for Asthma (GINA) 2002 step 4 therapy are a challenging population with a significant unmet medical need. In patients with inadequately controlled severe persistent asthma despite high-dose inhaled corticosteroid and LABA therapy, and often additional therapy, omalizumab significantly reduced the rate of clinically significant asthma exacerbations, severe exacerbations and emergency visits. (more…)

Daily Versus As-Needed Corticosteroids For Mild Persistent Asthma

The guidelines for asthma management recommend the use of regular inhaled corticosteroid in patients with mild persistent asthma, but in clinical practice it has been observed that patients often do not feel the need to use their inhaled corticosteroid regularly, which may lead to poor compliance. One possible reason is that because there are no symptoms the patients are not reminded to use their medications. Hence, the use of intermittent inhaled corticosteroid during worsening of asthma may be an option that could be considered in these subgroups of asthmatics. (more…)

Allergen-Specific IgE and Serum IgE: Early Immune Development Underlying Allergies

Serum IgE
A paradigm of immune development underlies allergy development and progression in early childhood. Briefly, the immune system of the fetus is maintained in a tolerogenic state, preventing adverse immune responses and rejection between the mother and fetus. Placental interleukin-10 (IL-10) suppresses the production of immune-potentiating inter-feron gamma (IFN-y) by fetal immune cells. IFN-y downregulates the production of pro-allergic cytokines, such as IL-4 and IL-13. (more…)

Allergic March of Childhood and Allergen Sensitization

Natural history studies with the following design features provide a firm epidemiologic foundation for risk factor assessments and etiologic hypotheses:
(1) long-term cohort studies of a prospective design minimize biases resulting from poor parental recall;
(2) multiple evaluations over time provide important checkpoints during the dynamic period of childhood growth and development; and
(3) the inclusion of objective disease measurements strengthens these studies by validating subjective disease assessments (i.e. questionnaire data). (more…)

Persistent Asthma and Bronchial Hyperresponsiveness

Persistent Asthma
In the Tucson CRS study, about 50% of young children experienced a period of recurrent wheezing and/or coughing in the first 6 years of life. These early-childhood wheezers were further subdivided into (1) ’transient early wheezers,’ with wheezing only <3 years; (2) ‘persistent wheezers,’ with manifestations through the first 6 years; and (3) ‘late-onset wheezers,’ with manifestations only after 3 years. Transient wheezers comprised the largest proportion of the group at 20%; persistent and late-onset wheezers made up slightly smaller proportions (14% and 15%, respectively). (more…)

Infection and Atopy in the Pathogenesis of Childhood Asthma

infection atopy childhood asthma
It is clear from the results of large epidemiologic studies that while atopy is a major risk factor for asthma, it is usually not sufficient by itself to drive the disease process to chronicity, as less than 25% of atopics develop persistent asthma. The situation in childhood is further complicated by an additional series of development factors, related to postnatal maturation of respiratory function. (more…)

Roflumilast Vs Beclomethasone Dipropionate for Treatment Of Persistent Asthma

Roflumilast
Roflumilast is an oral, once-daily PDE4 inhibitor with antiinflammatory activity in development for the treatment of asthma. Roflumilast was compared with inhaled beclomethasone dipropionate in patients with asthma.

Once-daily, oral roflumilast 500 µg was comparable with inhaled twice-daily beclomethasone dipropionate (400 µg/day) in improving pulmonary function and asthma symptoms, and reducing the use of rescue medication in patients with asthma. (more…)