Speed of Blood Withdrawal and Accurate Measurement of Oxygen Content in Mixed Venous Blood
| Autor: | Philip Jones, Nicole Hoover, David Klamm, Dianna Brown, Katie Jaschke, Sarah Doull, Ashley English, Kristin Sollars, Brenna Primrose, Marci Ebberts, Chung Odom, Alicia Clark |
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| Rok vydání: | 2014 |
| Předmět: |
Male
Cardiac output Time Factors medicine.medical_treatment Critical Care Nursing Phlebotomy medicine.artery Humans Medicine Oximetry Prospective Studies Cardiac Output Heart Failure Cross-Over Studies business.industry Pulmonary artery catheter Reproducibility of Results General Medicine Middle Aged medicine.disease Crossover study Oxygen Catheterization Swan-Ganz Heart failure Anesthesia Pulmonary artery Coronary care unit Female Blood Gas Analysis business Saturation (chemistry) Blood sampling |
| Zdroj: | American Journal of Critical Care. 23:486-493 |
| ISSN: | 1937-710X 1062-3264 |
| Popis: | Background Measurement of mixed venous oxygen saturation helps determine whether cardiac output and oxygen delivery are sufficient for metabolic needs. As recommended by the American Association of Critical-Care Nurses guideline, blood samples for determining mixed venous oxygen saturation are obtained by slowly, in 1 to 2 minutes, withdrawing 1.5 mL of blood from the distal port of the pulmonary artery catheter. In theory, the negative force of rapid withdrawal could pull oxygenated blood from the pulmonary capillary bed, causing falsely elevated saturation values. Objective To determine if the speed of withdrawal affects oxygen content in blood samples used to measure mixed venous oxygen saturation. Methods The sample consisted of heart failure patients with pulmonary artery catheters admitted to a cardiac intensive care unit. A prospective, randomized, 2 × 2 crossover design was used to compare mixed venous oxygen saturation in blood samples obtained quickly or slowly. A total of 50 sets of saturation values were analyzed. Each set included 1 blood sample obtained slowly, in 1 to 2 minutes, and 1 obtained rapidly, in 5 seconds. Results The mean difference in saturation values between the fast and the slow groups was -0.3 (CI, -1.5 to 0.8; P = .55), indicating that no meaningful systematic bias is attributable to fast withdrawal of blood. Conclusions Rapid blood sampling does not falsely elevate measurements of mixed venous oxygen saturation. |
| Databáze: | OpenAIRE |
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