The Journal of thoracic and cardiovascular surgery
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J. Thorac. Cardiovasc. Surg. · Jun 1984
Clinical TrialSurgical closure of patent ductus arteriosus in 268 preterm infants.
Over a 2 year period ending in April, 1981, 268 premature infants with birth weight below 1,750 gm underwent operation for a "hemodynamically significant" patent ductus arteriosus. Operations were performed in 13 centers participating in a collaborative study, which was primarily designed to evaluate the role of indomethacin in the management of patent ductus arteriosus. No patient died during the operations, which were done at a median age of 10 days. ⋯ In only one was the death directly attributable to the operative procedure. Hospital mortality (23%) and postoperative morbidity, which included bronchopulmonary dysplasia, pneumothorax, and sepsis, were unrelated to birth weight, age at operation, and degree of preexisting pulmonary disease or preoperative treatment of the infant with indomethacin. Results indicate that surgical ligation is a safe and effective procedure for treating patent ductus arteriosus with large left-to-right shunting in small premature infants.
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J. Thorac. Cardiovasc. Surg. · Jun 1984
Hemodynamic response to positive end-expiratory pressure following right atrium-pulmonary artery bypass (Fontan procedure).
Thirteen patients were studied in the early postoperative period to determine the hemodynamic response to increasing levels of positive end-expiratory pressure (PEEP) following right atrium-pulmonary artery bypass (Fontan procedure). Hemodynamic data and arterial oxygen and carbon dioxide tensions were measured without PEEP and with PEEP = 3, 6, 9, and 12 cm H2O. Cardiac index decreased progressively with increasing levels of PEEP compared to PEEP = 0 (cardiac index = 2.7 +/- 1.2 L/min/m2), and the decrease was significant at PEEP = 9 (cardiac index = 2.2 +/- 0.8 L/min/m2, p less than 0.05) and 12 cm H2O (cardiac index = 2.0 +/- 0.7 L/min/m2, p less than 0.05). ⋯ From these data it appears that PEEP is an effective means of raising arterial oxygen tension after right atrium-pulmonary artery bypass. A progressive fall in cardiac index occurs with increasing PEEP, and the fall becomes significant at PEEP greater than 6 cm H2O. The fall in cardiac index appears to be mediated by a significant rise in pulmonary vascular resistance index.