Predictable PaCO2 with two different flow settings using the Mapleson D system.
Two different settings of fresh gas flow (VFG) and minute ventilation (VE) used with the coaxial Mapleson D system (Bain), were evaluated in 59 adults (ASA I-III) during controlled ventilation and different types of surgical procedures. The two flow settings (alternatives A and B) were VFG of 75 and 110 ml.min-1.kg-1 and VE of 150 and 175 ml.min-1.kg-1, aiming to generate normocapnea and mild hypocapnea, respectively. The PaCO2 obtained with alternative A was 5.5 +/- 0.5 kPa (mean +/- s.d.), with 92% of the patients within the range 4.7-6.1 kPa. With alternative B, the PaCO2 was 4.4 +/- 0.5 kPa, with 82% of the patients within the range 3.5-4.9 kPa. It is concluded that these two flow regimes are suitable for clinical use when either normocapnea or mild hypocapnea is desired.
Jonsson
L O
LO
Department of Anaesthesia and Intensive Care, Ostersund Hospital, Sweden.
D000328:Adult; D000368:Aged; D000769:Anesthesia, Inhalation / Q000295:instrumentation* / Q000379:methods; D002245:Carbon Dioxide / Q000097:blood*; D005260:Female; D006801:Humans; D006935:Hypercapnia / Q000097:blood; D008297:Male; D008875:Middle Aged; D010313:Partial Pressure; D012119:Respiration; D013147:Spirometry; D013990:Tidal Volume; D012122:Ventilators, Mechanical
D002245:Carbon Dioxide