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Airway growth after pediatric lung transplantation
1Department of Pediatrics, University of Pennsylvania School of Medicine and Division of Cardiology, The Children's Hospital of Philadelphia, Philadelphia, Pennsylvania 19104, USA.
Insights
Computerized tomography (CT) scans reliably assess airway growth in pediatric lung transplant recipients. Post-transplant airway growth mirrors normal development, indicating successful integration and expansion.
Area of Science:
- Pediatric Pulmonology
- Thoracic Surgery
- Medical Imaging
Background:
- Lung transplantation (LT) is established for pediatric patients, but transplanted lung growth, particularly in infants, remains poorly understood.
- Computerized tomography (CT) scanning offers a non-invasive method to evaluate airway development in pediatric LT recipients.
- Limited data exists on airway growth dynamics post-pediatric LT, necessitating further investigation.
Purpose of the Study:
- To utilize CT scans for assessing airway growth in pediatric lung transplant recipients.
- To compare indexed airway diameter in LT patients versus normal controls.
- To evaluate and compare the somatic growth-indexed growth of pre-anastomotic and post-anastomotic airways in pediatric LT patients.
Main Methods:
- Retrospective review of CT scans from pediatric patients (<15 years) undergoing primary LT (1995-1998).
- Standardized measurements of airway diameters (trachea, main bronchi) in pre-anastomotic and post-anastomotic segments.
- Correlation of airway measurements with patient height and comparison to established normative data.
Main Results:
- Eleven of 16 pediatric LT patients had serial CT scans, with 31 scans reviewed overall.
- High inter-observer reliability (0.91) and low variability (<2 mm) confirmed CT measurement accuracy.
- Indexed tracheal growth closely matched normal values; pre- and post-anastomotic airways exhibited similar growth patterns relative to somatic growth.
Conclusions:
- CT scanning is a dependable tool for monitoring airway growth in pediatric lung transplant recipients.
- Tracheal growth in pediatric LT recipients parallels that of healthy children.
- Post-anastomotic airways demonstrate growth patterns consistent with native, pre-anastomotic airways.
Background:
Lung transplantation (LT) has been successfully offered to pediatric patients. Very little is known about the growth of the transplanted lung, especially in the infant population. Computerized tomography (CT) scanning is a simple method for studying pediatric patients who have undergone LT. We evaluated the use of CT scans to assess airway growth after pediatric LT, compare airway diameter indexed to somatic growth between LT patients and normals, and compare the growth of pre-anastomotic and post-anastomotic airways indexed to somatic growth in pediatric LT patients.
Methods:
We reviewed CT scans on all pediatric patients who underwent primary LT before their fifteenth birthday between January 1995 and September 1998. Uniform measurements of diameter were made in pre-anastomotic (trachea, and proximal right and left bronchi) and post-anastomotic (distal right and left bronchi) sites. These measurements were then correlated with height and compared to previously published normal values.
Results:
Of the 16 patients who underwent LT during the study period, 11 had at least 2 sequential CT scans (LT age 3 months to 14 years, median 2 years). Thirty-one CT scans were reviewed. Inter-observer variability was within 1 standard deviation (2 mm) in 93% of the measurements and inter-observer reliability was 0.91 by analysis of variance. Tracheal transverse diameter plotted against body height (slope 0.0072, correlation coefficient 0.88) was virtually identical to previously published norms. A similar relationship between airway diameter and height was observed in pre-anastomotic and post-anastomotic segments.
Conclusion:
CT scanning is a reliable method for assessing airway growth in pediatric LT recipients. Tracheal growth in pediatric LT recipients is similar to that of normal children. Post-anastomotic large airways grow similarly to native, pre-anastomotic airways.
