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Appropriate Tourniquet Pressure for Effective Vein Distention for Venipuncture and Objective Indices for Vein Distention

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  • 静脈穿刺に有効な静脈怒張を得るための適切な駆血圧と静脈怒張に関与する客観的指標について
  • ジョウミャク センシ ニ ユウコウ ナ ジョウミャク ドチョウ オ エル タメ ノ テキセツ ナ クケツアツ ト ジョウミャク ドチョウ ニ カンヨ スル キャッカンテキ シヒョウ ニ ツイテ

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The purpose of this study was to examine appropriate tourniquet pressure to obtain effective vein distention for venipuncture, and discuss the objective indices for vein distention. Several parameters for vein distention, such as vein cross-section area, were calculated under different tourniquet pressures. Subjects (46healthy adults; 23men, 23women), had a pneumatic tourniquet (width 13cm) applied at the upper arm. and the tourniquet was inflated to 20, 40, 60, 80 or 100mmHg for one minute. The tourniquet pressure was randomized. Venous distention grade by palpation (VDGp) was increased up to 80mmHg of tourniquet pressure, but then slightly decreased at 100mmHg. VDGps for 60 and 80mmHg were not significantly different, but both were significantly higher than that of 20 and 40mmHg. VDGp correlated well with outer pressure, which begins to collapse the vein (index of venous resistance at palpation), the expansion ratio of vein cross-section area before and after tourniquet application, and the vein cross-section area successively.These data suggest that a tourniquet pressure of 60mmHg is appropriate for effective vein distention for venipuncture, and outer pressure, which begins to collapse the vein, is useful for an objective index of vein distention.



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