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要旨
希釈式自己血輸血(hemodilutional autologous blood transfusion:HAT)のための採血に要する時間および採血中の低血圧発生頻度と昇圧薬(エフェドリンまたはフェニレフリン)使用量を動脈ラインから採血したもの(A群,25名)と末梢静脈ラインから採血したもの(V群,17名)で後ろ向きに比較検討した。採血に要する時間はV群(中央値[四分位範囲],15[11-18]分)のほうがA群(22[19-29]分)よりも短かった(P<0.05)。採血中の低血圧(平均血圧≦65mmHg)発生頻度およびエフェドリン・フェニレフリン使用量に両群間で差がなかった。採血に要する時間から見ると,HATのための採血部位は末梢静脈ラインのほうが動脈ラインより適切である可能性が示唆された。
Background:It has been unknown whether an arterial line or a peripheral venous line is better for collecting blood for hemodilutional autologous blood transfusion(HAT).
Methods:We used the electronic medical and anesthesia records of patients who underwent a unilateral total hip arthroplasty and received HAT at our hospital during the years 2017-2022. Of these 68 patients, 26 were excluded from the analyses due to incomplete data. We compared(i)the length of time required for blood collection,(ii)the frequency of hypotension(mean blood pressure≤65 mmHg), and(iii)the use of a vasopressor(ephedrine or phenylephrine)during blood collection between the arterial-line collection cases(Arterial group, n=25)and the peripheral venous-line collection cases(Venous group, n=17).
Results:The blood collection time was significantly shorter in the Venous group(15[11-18]min, median[interquartile range])compared to the Arterial group(22[19-29]min)(p<0.05). There were no significant between-group differences in the frequency of hypotension or ephedrine/phenylephrine use during blood collection.
Conclusions:These results suggest that a peripheral venous line is more appropriate than an arterial line for blood collection for HAT, as using the venous line enables significantly quicker blood collection.

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