Abstract
Objective
To determine whether mixed venous blood gas sampling obtained by pulmonary artery catheter (PAC) is influenced by the speed of withdrawal.
Design
Prospective, observational study.
Setting
Surgical intensive care unit at a university hospital.
Subjects
Twenty-five patients in the early postoperative period of cardiac surgery.
Measurements and main results
After verification of the adequate position of the PAC, measurements of mixed venous blood gas oxygen saturation, oxygen partial pressure (PO2), carbon dioxide partial pressure (PCO2), pH and bicarbonates were obtained at two different rates of withdrawal. A slow sampling was taken at a mean speed of 3 ml/min and a fast sampling at 18 ml/min for each patient. The mean difference in venous oxygen saturation between slow and fast samplings was -0.18±1.3%, venous PO2: −0.2±1.3 mmHg, venous PCO2: 0.1±0.9 mmHg, venous pH: 0±0.03, venous bicarbonates: 0.03±0.5 mmol/l.
Conclusion
Using the Bland & Altman method, we showed a satisfactory agreement between slow and fast mixed venous blood gas sampling techniques when measuring PO2, oxygen saturation, PCO2, pH and bicarbonates though a PAC.
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References
Connors AF Jr, Speroff T, Dawson NV, Thomas C, Harrell FE Jr, Wagner D, Desbiens N, Goldman L, Wu AW, Califf RM, Fulkerson WJ Jr, Vidaillet H, Broste S, Bellamy P, Lynn J, Knaus WA (1996) The effectiveness of right heart catheterization in the initial care of critically ill patients. SUPPORT Investigators. JAMA 276:889–897
Sandham JD, Hull RD, Brant RF, Knox L, Pineo GF, Doig CJ, Laporta DP, Viner S, Passerini L, Devitt H, Kirby A, Jacka M (2003) A randomized, controlled trial of the use of pulmonary-artery catheters in high-risk surgical patients. N Engl J Med 348:5–14
Mihm F, Feeley TW, Rosenthal M, Raffin TA (1980) The lack of effect of variable blood withdrawal rates on the measurement of mixed venous oxygen saturation. Chest 78:452–455
Suter PM, Lindauer JM, Fairley HB, Schlobohm RM (1975) Errors in data derived from pulmonary artery blood gas values. Crit Care Med 3:175–181
Bernstein AD, Parsonnet V (2000) Bedside estimation of risk as an aid for decision-making in cardiac surgery. Ann Thorac Surg 69:823–828
Teboul JL, Besbes M, Andrivet P, Axler O, Douguet D, Zelter M, Lemaire F, Brun-Buisson C (1992) A bedside index assessing the reliability of pulmonary artery occlusion pressure measurements during mechanical ventilation with positive end-expiratory pressure. J Crit Care 7:22–29
Gardner RM (1981) Direct blood pressure measurement—dynamic response requirements. Anesthesiology 54:227–236
Bland JM, Altman DG (1986) Statistical methods for assessing agreement between two methods of clinical measurement. Lancet 1:307–310
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This study was supported by the “Plan de pratique des anesthésiologistes de l’Institut de Cardiologie de Montréal”.
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Sirdar, E., Guimond, JG., Coiteux, I. et al. Mixed venous blood gas sampling is not influenced by the speed of withdrawal in cardiac surgery patients. Intensive Care Med 30, 1969–1973 (2004). https://doi.org/10.1007/s00134-004-2392-4
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DOI: https://doi.org/10.1007/s00134-004-2392-4