Nine infants with bronchopulmonary dysplasia underwent cardiac catheterization to define their circulatory status. In room air, the mean cardiac index was normal (3.4 liters/mm/sq m), but pulmonary arterial pressure (39 mm Hg, mean) and pulmonary vascular resistance (8.6 Wood units · sq m) were elevated. Preejection period/right ventricular ejection time ratios determined echocardiographically correlated well with values obtained at catheterization, but did not correlate well with hemodynamic values. Administration of 40% and 88% oxygen caused variable responses in hemodynamic measurements. Studies of left ventricular function were normal in all patients. These findings raise questions about the long-term prognosis of infants with bronchopulmonary dysplasia.
- Received November 19, 1981.
- Accepted January 25, 1982.
- Copyright © 1982 by the American Academy of Pediatrics