Preusser B A, Lash J, Stone K S, Winningham M L, Gonyon D, Nickel J T
College of Nursing, Ohio State University, Columbus.
Nurs Res. 1989 Sep-Oct;38(5):276-9.
The purpose of this study was to determine the minimum amount of discard sample required to remove all heparinized normal saline from an indwelling arterial catheter to obtain an accurate arterial blood gas (ABG) sample. The pH and partial pressure of oxygen (PO2) and carbon dioxide (PCO2) were adjusted to known values prior to the onset of the study. The discard sample size ranged from zero to 5 cubic centimeters (cc), increasing at 0.5-cc increments. Twenty-nine sets of 11 consecutive discard/ABG samples, totaling 319 ABG specimens, were drawn over 20 minutes. Based on the data, a 2-cc discard is sufficient to guarantee accurate blood gases when withdrawing blood from an arterial catheter with a 1-cc dead space volume.
本研究的目的是确定从留置动脉导管中去除所有肝素化生理盐水以获得准确动脉血气（ABG）样本所需的最小弃血样本量。在研究开始前，将pH值、氧分压（PO2）和二氧化碳分压（PCO2）调整到已知值。弃血样本量从零到5立方厘米（cc）不等，以0.5 cc的增量增加。在20分钟内采集了29组，每组11个连续的弃血/ABG样本，共319个ABG标本。根据数据，当从死腔容积为1 cc的动脉导管中采血时，弃血2 cc足以保证获得准确的血气结果。
