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Elimination of apparatus dead space — a simple method for improving CO 2 removal without increasing airway pressure
Author(s) -
Larsson A.
Publication year - 1992
Publication title -
acta anaesthesiologica scandinavica
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.738
H-Index - 107
eISSN - 1399-6576
pISSN - 0001-5172
DOI - 10.1111/j.1399-6576.1992.tb03567.x
Subject(s) - dead space , medicine , lumen (anatomy) , tidal volume , oxygenation , expiration , airway , anesthesia , ventilation (architecture) , respiratory tract , respiratory system , surgery , mechanical ventilation , thermodynamics , physics
During mechanical ventilation the apparatus dead space can be eliminated by insufflating through one lumen of a tracheal double‐lumen tube and allowing expiration through the other. In six intravenously anesthetized pigs, this technique resulted in an 18% (1 kPa) decrease in Paco 2 compared with insufflating through both lumens (32 ml rebreathing volume). Oxygenation, airway pressures, and tidal volumes were unchanged. Flushing the trachea with fresh gas during the expiratory phase did not improve the efficiency of ventilation. It is concluded that elimination of apparatus dead space improves CO 2 removal without increasing airway pressures and tidal volumes, and it is suggested that minimization of apparatus dead space should be tried before more advanced ventilatory modes are considered.