Establishment of the safe catecholamine syringe exchange method

primed with 4ml and relay method

Abstract

Previous studies on syringe exchange in catecholamine administration reported minimum influence on the change in circulation despite various methods being utilized. The method performed by our ward had been a parallel exchange to increased and decrease the flow quantity. We have progressively adopted the two-syringe pump method. However, this complicated exchange maneuver required twenty minutes. We examined the 4.0ml catecholamine-filled connecting tube with on/off switch method reported by Nakanishi et al that was found to be a safer exchange method. The two-syringe pump method requires that both tubing is filled with catecholamine and a relay switch is utilized to change from one syringe to the subsequent syringe. Various types of T-shape stopcock exchanges were analyzed using glucose solution and tested for density. As a result, the opening-type T-shape stopcock had fewer glucose density changes than a T-shape stopcock with rubber. Additionally, when the T-shape stopcock connecting position was at the same point, the glucose density was stable. When the syringe exchange was primed with 4ml and the relay method employed to a patient, the average blood pressure of the patient did not change significantly before and after the exchange. We conclude that the 4ml priming in addition to the relay method was shown to be a safe catecholamine syringe exchange method.