Physicochemical Stability of Ternary Mixtures of Sufentanil, Baclofen, and Ropivacaine in Polypropylene Syringes for Intrathecal Analgesia

Sorrieul, Jérémy; Robert, Julien; Chapel, Fanny; Gossye, Thomas; Devys, Catherine

Abstract

Physicochemical Stability of Ternary Mixtures of Sufentanil, Baclofen, and Ropivacaine in Polypropylene Syringes for Intrathecal Analgesia

Author(s): Sorrieul Jérémy, Robert Julien, Chapel Fanny, Gossye Thomas, Devys Catherine

Issue: Mar/Apr 2020 - Volume 24, Number 2

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Page(s): 156-162

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Abstract

Intrathecal analgesia is a method using various molecules alone or in combination. Among these, a preparation of sufentanil-ropivacaine-baclofen is widely used. Instead of moving patients to the few expert centers taking charge of these specific preparations, it could be beneficial to transport syringes to peripheral centers who manage pump refills. The objective of this study was to determine the physicochemical compatibility and stability of a preparation of sufentanil, ropivacaine, and baclofen in polypropylene syringes. Drugs were mixed together at different concentrations and stored with light protection at 5°C ± 3°C and 25°C ± 2°C. The stabilities were determined by visual inspection, turbidity, pH measurement, and ultra-high-pressure liquid chromatography assay of drug concentrations. The concentrations of ropivacaine, baclofen, and sufentanil were stable after 7 days at 5°C ± 3°C and no degradation of product appeared. The drug mixtures were clear in appearance and no color change or precipitation was observed. Throughout this period, the absorbance and the pH value of samples remained stable. The preparations of sufentanil, baclofen, and ropivacaine remained stable for at least 7 days when stored in polypropylene syringes at 5°C ± 3°C.

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