2012 OPEN FORUM Abstracts
THE EFFECTS OF ABNORMAL BLOOD PRESSURE ON ARTERIAL SAMPLER FILLING TIMES.
BACKGROUND: Sampler filling time begins with the initial flash of blood in the needle hub until the preset sampler volume is obtained. Previous research has analyzed the correlation between mean arterial pressure (MAP) and arterial sampler filling time, but failed to include abnormal blood pressures. Purpose: To determine if the time required to fill an arterial sampler is an accurate indication of a successful arterial blood sample in hypertensive and hypotensive adults compared to those with normal BP. Hypotheses: MAP and arterial sampler filling time will have a negative correlation; venous sampler filling time will be significantly longer than arterial filling time. METHODS: This study included four groups: three arterial groups, hypertensive, hypotensive or normal and one group received a venipuncture. During the arterial and venipuncture procedures, sampler filling time, blood volume and PO2 were measured. Additionally, BP and SpO2 were measured for the arterial groups. We used a Pearson correlation coefficient to determine the relationship between MAP and sampler filling rate. We determined if there was a significant difference between arterial and venous groups using ANOVA with an alpha level of 0.05 and Tukeys post hoc. RESULTS: Our subjects included: 13 hypotensive, 6 normotensive, 6 hypertensive and 15 venous (N=40). The mean sampler filling times were 220.4 sec/mL for venous and 18.1sec/mL for arterial. There was a significant difference between mean arterial filling time and mean venous filling time (p=0.0001). There were no significant differences in mean sampler filling rates between arterial subgroups (p=0.997). The correlation between MAP and filling rates was 0.062 (p=.384). CONCLUSION: There is a significant difference between arterial and venous filling rates. There was no relationship between filling times and abnormal MAPs. Regardless of arterial blood pressure, arterial sampler filling time can be used as an indicator of a successful arterial puncture at the bedside. Sponsored Research - None