A new endotracheal tube for neonatal use is described in which a 5FG pressure measuring catheter is attached to the convex surf ace of a conventional polyvinylchloride endotracheal tube. Using this modified endotracheal tube intratracheal pressure can be measured. Preliminary studies were undertaken in three infants. It was found that at high ventilatory rates (above 80/min) pressures measured within the trachea were different from those measured in the ventilator circuit.
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