The Science Journal of the American Association for Respiratory Care

2009 OPEN FORUM Abstracts

EFFECTS OF MEAN ARTERIAL PRESSURE AND NEEDLE SIZE ON ARTERIAL SAMPLER FILLING TIME

Kimberly L. Johnson, Ashley J. Johnson, Katherine A. Barnes, F Herbert Douce; Respiratory Therapy, Ohio State Medical Center, Columbus, OH

BACKGROUND: Arterial blood sampling is subject to numerous sampling errors, which may potentially result in venous blood sampling rather than arterial. A mistake such as this may lead to delayed care, poor medical treatment, multiple percutaneous punctures, as well as increased risk of infection. PURPOSE: We are investigating the effects of mean systemic blood pressure and needle gauge on blood sample filling times in order to find a way of verifying whether or not blood collected is in fact arterial, prior to the actual sample analysis. METHODS: We constructed a model using the bio console extracorporeal blood pump speed control to circulate whole blood at a constant 4 liters per minute. From simulating a circuit mimicking the human vascular system, blood was collected via plastic syringes. The effects of varying blood pressures and needle sizes were used to determine a correlation between arterial blood pressures and sampler filling times. Hemostats were used to create six pressures, including 57 mm hg (shock), 70 (low normal), 93 (normal), 107 (high normal), 133 (severe hypertension), and 14 (peripheral venous pressure). Random assignment was used to determine order of gauge and pressure for experiment. RESULTS: There was a significant difference between venous and arterial blood pressure sampler filling times. There was a significant difference between hypo- and hypertensive MAPs. There was a significantly faster filling time at higher pressures. There was no significant difference in filling times based on needle gauge. The Pearson correlation coefficient between mean blood pressures and sampler filling times was –0.86. CONCLUSION: Monitoring filling times may enable RTs to confirm successful arterial punctures. A sampler filling time of greater than 20 seconds indicates vein puncture. Confirming successful arterial puncture prior to the time of analysis would expedite appropriate patient care decisions and reduce unnecessary health care costs. Sponsored Research - None

Sampler Filling Times

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