Pulmonary atresia with ventricular septal defect and persistent airway hyperresponsiveness

Area of Science:

• Cardiology
• Pulmonology
• Genetics

Background:

• Surgical repair of pulmonary atresia and ventricular septal defect is frequently followed by significant hyperinflation and airflow obstruction.
• The prevalence and characteristics of airway hyperresponsiveness in this patient population remain incompletely understood.

Purpose of the Study:

• To objectively characterize airway hyperresponsiveness in patients post-surgical repair of pulmonary atresia and ventricular septal defect.
• To determine the association between airway hyperresponsiveness and chromosome 22q11.2 microdeletion status.

Main Methods:

• A prospective study enrolled 33 children and young adults with pulmonary atresia and ventricular septal defect.
• Participants were stratified by chromosome 22q11.2 microdeletion status.
• Airway hyperresponsiveness was assessed using an asthma inventory scale and methacholine challenge testing.

Main Results:

• Overall, 66.7% of patients met criteria for airway hyperresponsiveness.
• Airway hyperresponsiveness was present in 62% of patients with the 22q11.2 microdeletion and 70% of nonsyndromic patients.
• No evidence of haploinsufficiency was found in nonsyndromic patients.

Conclusions:

• A strong association exists between pulmonary atresia and ventricular septal defect and persistent airway hyperresponsiveness.
• Chromosome 22q11.2 microdeletion status did not influence the likelihood of airway hyperresponsiveness.
• These findings suggest a need to anticipate respiratory difficulties post-surgery and offer insights into airway hyperresponsiveness pathogenesis.