Herr R D, Bossart P J, Blaylock R C, Kroger K, Ash O
Department of Surgery, University of Utah Medical School, Salt Lake City.
Ann Emerg Med. 1990 Jul;19(7):789-92. doi: 10.1016/s0196-0644(05)81705-6.
The aspiration of blood through a functioning IV line to obtain samples for laboratory analysis was evaluated. Thirty-eight emergency department patients were studied. Each had an 18-gauge IV catheter placed and then received a 100-mL bolus of either normal saline, lactated Ringer's, or 5% dextrose in water. Two samples of blood ("first aspirate" and "second aspirate") were then aspirated from the IV catheter while one sample was obtained by venipuncture from the opposite arm (control). All three samples were then analyzed for CBC, electrolytes, BUN, creatinine, and glucose. Catheter aspiration succeeded in 30 of 38 attempts (79%). Three samples were hemolyzed, and five samples were unable to be fully aspirated. Results of paired t testing showed only occasional statistical significance and except for bicarbonate were not of clinical significance. This study suggests that catheter aspiration is a useful method of obtaining blood for certain laboratory tests in patients receiving IV infusions.
评估了通过正常运作的静脉输液管路采血以获取实验室分析样本的情况。对38例急诊科患者进行了研究。每位患者均置入一根18号静脉导管，然后接受100毫升的生理盐水、乳酸林格氏液或5%葡萄糖水溶液推注。随后从静脉导管抽取两份血样（“首次抽吸物”和“第二次抽吸物”），同时从对侧手臂通过静脉穿刺获取一份血样（对照）。然后对所有三份血样进行全血细胞计数、电解质、血尿素氮、肌酐和葡萄糖分析。38次尝试中有30次成功通过导管采血（79%）。三份样本发生溶血，五份样本无法完全抽吸。配对t检验结果仅偶尔具有统计学意义，除碳酸氢盐外均无临床意义。本研究表明，对于接受静脉输液的患者，导管采血是获取某些实验室检查用血的一种有用方法。
