Pressure-limit ventilators are used because it is believed that they decrease the incidence of pulmonary gas leaks and chronic lung disease. The disadvantage of pressure-limit ventilators is that there is no automatic compensation for changes in
compliance and resistance of the lung and the chest wall. Consequently, if lung compliance decreases, tidal volume will decrease and blood gases will worsen.
The aim of this study is to find the adequacy for the oxygenation and ventilation of volume-limit ventilator with pressure-limit control accessary in pediatric patient with congenital heart disease.
The pressure-limit control accessary for anesthetic ventilator(AV-E, North America Drager, Bedford, USA) in 36 pediatric patients undertaken open heart surgery and thoracotomy, retrospectively, were employed. The patients were divided into 3
groups
according to their body weights. The respiratory rate of group I (<5 kg, n=12) was 25/min, group Ⅱ(≥5, <10 kg, n=6) was 20/min and group Ⅲ(≥10, <20 kg, n=8) was 15/min. The patients were divided into another 2 groups, A(n=30) or B(n=6), with
the
supine or lateral, respectively according to the operation position.
The results showed all the values of arterial blood gases ahnost within normal limits, except one patient in each group. We concluded that anesthetic Drager infant ventilator with pressure-limit control accessary was useful during controlled
ventilation, and this is suitable for the prolonged operation in pediatric patients with the supine or lateral position. (Korean J Anesthesiol 1995; 29: 506∼511)
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