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Department of Pediatrics, Harbor-UCLA Medical Center, Torrance, California 90502
Received 7 March 1997; accepted in final form 15 May 1997.
Wada, Kazuko, Alan H. Jobe, and Machiko Ikegami. Tidal
volume effects on surfactant treatment responses with the initiation of
ventilation in preterm lambs. J. Appl.
Physiol. 83(4): 1054-1061, 1997.
We hypothesized
that initiation of ventilation in preterm lambs with high volumes would
cause lung injury and decrease the subsequent response to surfactant
treatment. Preterm lambs were randomized to ventilation for 30 min
after birth with 5 ml/kg (VT5),
10 ml/kg (VT10), or 20 ml/kg
(VT20) tidal volumes and then ventilated with ~10 ml/kg tidal volumes to achieve arterial
PCO2 values of ~50 Torr to 6 h of
age. VT20 lambs had lower
compliances, lower ventilatory efficiencies, higher recoveries of
protein, and lower recoveries of surfactant in alveolar lavages and in surfactant that had decreased compliances when tested in preterm rabbits than VT5 or
VT10 lambs. Other lambs
randomized to treatment with surfactant at birth and ventilation with
6, 12, or 20 ml/kg tidal volumes for 30 min had no indicators of lung
injury. An initial tidal volume of 20 ml/kg decreased the subsequent
response to surfactant treatment, an effect that was prevented with
surfactant treatment at birth.
respiratory distress syndrome; lung injury; compliance; dipalmitoylphosphatidylcholine; arterial carbon dioxide partial pressure
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