PEDIATRICS Vol. 75 No. 1 January 1985, pp. 80-84
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Pulmonary Vascular Response to Oxygen in Infants with Severe Bronchopulmonary Dysplasia

Steven H. Abman MD1, Robert R. Wolfe MD1, Frank J. Accurso MD1, Beverly L. Koops MD1, C. Michael Bowman MD, PhD1, and James W. Wiggins Jr MD1

1 From the Department of Pediatrics, University of Colorado Health Sciences Center, Denver

The cardiac catheterization data of six infants with bronchopulmonary dysplasia (BPD) were reviewed to examine the responsiveness of their pulmonary vascular beds to changes in oxygen tension. The infants were studied because of slow recovery from their oxygen requirements and clinical evidence of persistent pulmonary hypertension. All were receiving home oxygen therapy and had abnormal chest radiographs and right ventricular hypertrophy by ECG at the time of catheterization (mean age, 25 months). All infants had mean pulmonary artery pressure >25 mm Hg in room air, with a mean of 48 mm Hg. All decreased mean pulmonary artery pressure by at least 10 mm Hg when placed in high levels of inspired oxygen (FiO2 > 80), with a mean pulmonary artery pressure of 25 mm Hg. This represented a significant decrease in mean pulmonary artery pressure from room air pressures (P < .005). Mean pulmonary artery pressure was also measured in three infants who were breathing supplemental oxygen by nasal cannula at flow rates similar to levels used for outpatient therapy. Most of the reduction in mean pulmonary artery pressure that occurred at high FiO2 occurred at these lower flow rates of supplemental oxygen. It is concluded that infants with bronchopulmonary dysplasia who have pulmonary hypertension generally have reactive pulmonary vascular beds, responsive to supplemental oxygen. Continuous oxygen therapy by nasal cannula may be useful in the treatment of pulmonary hypertension associated with bronchopulmonary dysplasia.

Key Words: bronchopulmonary dysplasia • oxygen tension • hyperteneion

Submitted on November 14, 1983
Accepted on March 15, 1984




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