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Predictable normocapnoea in controlled ventilation of infants with Jackson Rees or Bain system
Author(s) -
Park J. W.,
Chung S. H.,
Choe Y. K.,
Kim Y. J.,
Shin C. M.,
Park J. Y.
Publication year - 1998
Publication title -
anaesthesia
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.839
H-Index - 117
eISSN - 1365-2044
pISSN - 0003-2409
DOI - 10.1046/j.1365-2044.1998.00637.x
Subject(s) - medicine , tidal volume , ventilation (architecture) , anesthesia , respiratory minute volume , volume (thermodynamics) , fresh gas flow , controlled ventilation , respiratory system , thermodynamics , physics , sevoflurane
We have devised a formula for ventilator settings which would provide normal minute ventilation without rebreathing during controlled ventilation using a Jackson Rees or Bain system. As V T = V S + V F − V L , where V T = delivered tidal volume, V S = set tidal volume, V F = the volume of fresh gas entering during the inspiratory phase and V L = the lost volume due to the compliance of the system, V S was derived: V S = V L + V T × [1 − b /(1 + a)] where a = expiratory‐to‐inspiratory ratio and b = the ratio of fresh gas flow to the minute ventilation. It was evaluated in 62 infants. Arterial partial pressure of carbon dioxide (mean (SD)) was 4.6 (0.5) kPa (35 (4) mmHg) with a range of 3.42–5.78 kPa (26–44 mmHg). The 90th percentile was 5.1 kPa (39 mmHg). It is concluded that predictable normocapnoea can be conveniently achieved in infants in controlled ventilation with Jackson Rees or Bain system if our formula is applied.