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Changes in the arterial to end‐tidal Pco 2 differences during coronary artery bypass grafting
Author(s) -
Fletcher R.,
Veintemilla F.
Publication year - 1989
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.1399-6576.1989.tb02986.x
Subject(s) - medicine , bypass grafting , sternum , artery , cardiology , pco2 , anesthesia , surgery
The arterial to end‐tidal Pco 2 difference, Paco 2 ‐P e ,co 2 , was measured at four different stages during coronary artery bypass grafting in 43 patients: 1) before sternotomy; 2) after sternotomy, sternum retracted; 3) after bypass, sternum still retracted; 4) sternum closed. Mean Paco 2 ‐P e ,co 2 initially was 0.6 kPa and changed scarcely at all during the procedure. There were, however, some moderate individual changes in Paco 2 — P e ,co 2 during surgery, the range of changes compared to the initial value being from — 1.4 to + 1.3 kPa. The standard deviations for the changes from stage to stage were 0.3–0.4 kPa. Paco 2 — P e ,co 2 changed by more than 0.5 kPa on only 12 occasions in ten patients. The limitations of Paco 2 — P e ,co 2 as an index of the alveolar deadspace fraction and the efficiency of ventilation are discussed.