Recurrent wheezing in the preschool child.

Area of Science:

• Pediatric Pulmonology
• Exercise Physiology
• Respiratory Medicine

Background:

• Recurrent wheezing in children is a common condition.
• Exercise can trigger bronchoconstriction in susceptible individuals.
• Understanding exercise-induced bronchoconstriction is crucial for managing pediatric respiratory conditions.

Purpose of the Study:

• To investigate the bronchoconstrictor response to exercise in healthy children versus those with recurrent wheezing.
• To quantify changes in airflow obstruction and respiratory resistance post-exercise.
• To assess the efficacy of salbutamol in mitigating exercise-induced bronchoconstriction.

Main Methods:

• Utilized the Wright low-range peak flow meter for airflow measurement.
• Employed a modified forced oscillation technique to assess total respiratory resistance.
• Compared responses in 29 healthy children and 23 children with recurrent wheezing after a 6-minute run.

Main Results:

• Healthy children exhibited no significant airflow obstruction post-exercise.
• 20 out of 23 wheezy children demonstrated a significant mean increase in total respiratory resistance (65.5%) after exercise.
• All wheezy children showed improvement in airflow obstruction following salbutamol inhalation.

Conclusions:

• Children with recurrent wheezing are prone to significant bronchoconstriction following exercise.
• Exercise-induced bronchoconstriction is a key characteristic differentiating wheezy children from healthy controls.
• Salbutamol effectively reverses exercise-induced airflow obstruction in this pediatric population.