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Lung mechanics in infants with left-to-right shunt congenital heart disease
Insights
Infants with congenital heart disease have impaired lung mechanics, including lower pulmonary compliance and higher airway resistance. The right pulmonary artery-to-aortic size ratio (RPA/DAO) best predicts these lung function changes.
Area of Science:
- Pediatric Cardiology
- Pulmonary Physiology
- Medical Imaging
Background:
- Infants with congenital heart disease (CHD) and left-to-right shunts often exhibit altered lung mechanics.
- Understanding the relationship between hemodynamic parameters and lung function is crucial for managing these patients.
Purpose of the Study:
- To identify the hemodynamic measurement that best correlates with lung mechanics in infants with CHD and left-to-right shunts.
- To compare lung function in infants with CHD to healthy controls.
Main Methods:
- Dynamic pulmonary function tests and echocardiography were performed in 26 infants with CHD and 37 healthy infants.
- Key parameters measured included tidal volume, pulmonary compliance (CL), expiratory resistance (Re), and echocardiographic indices like the right pulmonary artery-to-aortic size ratio (RPA/DAO).
Main Results:
- Infants with CHD demonstrated significantly lower pulmonary compliance and tidal volume, and higher expiratory airway resistance compared to controls.
- Pulmonary compliance and expiratory resistance showed significant correlations with the RPA/DAO and pulmonary flow velocity parameters (ACT/square root of RR).
- Stepwise multiple regression analysis identified RPA/DAO as the strongest echocardiographic predictor for both pulmonary compliance and expiratory resistance.
Conclusions:
- Infants with CHD and left-to-right shunts exhibit compromised lung compliance and increased expiratory airway resistance.
- The echocardiographic measurement of RPA/DAO is the most effective parameter for assessing changes in lung mechanics in this population.
Abstract:
To clarify which hemodynamic measurement correlates best with lung mechanics in infants with congenital heart disease and left-to-right shunts, dynamic pulmonary function tests and echocardiography were performed in 26 infants with such disease (study infants) and in 37 normal, healthy infants (control infants). The tidal volume and pulmonary compliance (CL) were lower and airway resistance higher in infants with congenital heart disease than in control infants. A significant correlation was demonstrated between CL, expiratory resistance (Re), and the right pulmonary artery-to-aortic size ratio (RPA/DAO). CL and Re also correlated well with the corrected acceleration time square root of RR ratio (ACT/square root of RR: ACT, acceleration time and RR: length of the cardiac cycle) of pulmonary flow velocity. Stepwise multiple regression analysis revealed that RPA/DAO correlated best with both CL and Re. It is concluded that infants with congenital heart disease and left-to-right shunts have lower lung compliance and higher expiratory airway resistance than normal children, and that RPA/DAO is the echocardiographic parameter that correlates best with the changes in lung mechanics.