Abstract
We report a case in which an obstructive bronchial cast 3 inches in length was produced during mechanical ventilation despite the use of a Servo SH 150 'artificial nose' type of humidifier. This suggests that use of this device can be inappropriate for patients requiring long-term ventilation. One should consider such variables as minute vol-ume, inspiratory flowrates, and degree of secretion production before deciding to employ this kind of humidifier.
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