Stability of undiluted and diluted adenosine at three temperatures in syringes and bags

The stability of adenosine in various diluents in polypropylene syringes and polyvinyl chloride (PVC) bags at three temperatures was studied. Portions of pooled undiluted adenosine infusion (3 mg/ mL) were stored in 60-mL capped syringes, 20 for each storage condition. Adenosine infusions were prepared by mixing adenosine with 5% dextrose injection, 0.9% sodium chloride injection, lactated Ringer's injection, or 5% dextrose and lactated Ringer's injection to produce a concentration of 0.75 mg/mL. Samples of each infusion were stored in 60-mL capped syringes and 50-mL bags, 20 syringes and 20 bags for each storage condition. Syringes and bags were stored in the dark at 25, 5, and -15 degrees C. At various sampling times, three syringes and three bags of each infusion were removed for visual inspection, pH measurement, and high-performance liquid chromatographic analysis. At 10 and 16 days, fungal growth at 25 degrees C was suspected in the infusions prepared with 5% dextrose injection. For all other samples, there was no evidence of precipitation or change in pH. The concentration of adenosine remained constant in all samples at all storage conditions. Adenosine 3 mg/mL was stable in polypropylene syringes for 7 days at 25 degrees C, 14 days at 5 degrees C, and 28 days at -15 degrees C; adenosine 0.75 mg/ mL in 0.9% sodium chloride injection and in 5% dextrose injection was stable in polypropylene syringes and PVC bags for 16 days at 25, 5, and -15 degrees C; and adenosine 0.75 mg/mL in lactated Ringer's injection and in 5% dextrose and lactated Ringer's injection was stable in syringes and bags for 14 days at 25, 5, and -15 degrees C.