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This was the first of four events reported on an issue with the smith's medical cadd solis pca pumps with volume infused discrepancies.Patient on pca dilaudid at 3 mg/hr via cadd pump.Reservoir volume at zero and cartridge removed and new 250cc cartridge applied.It was noted that there was 44cc of waste narcotic left inside in the cartridge.Pharmacy was contacted about a potential overfill of the cartridge (pharmacy reported that they do not overfill these cartridges.) nurse questioning if pump needed to be recalibrated and pump was sent to biomedical engineering.Follow up investigation: biomedical engineering tested cadd pump post event and found no operational issues.Unable to conduct testing with actual pump cassette involved in event due to the contents.Further testing was conducted by biomed and the testing performed did not find any discrepancy in delivery.Biomed was unable to duplicate errors.Unit tested with a 250 ml cassette filled with ringers solution by pharmacy.Ran at 13 ml/hr.Pump ran for approximately 19 hrs and 15 mins and test results indicated unit performed properly.All four events occurred on the same nursing unit.Since the last reported event in january, no similar events with the pump have been reported.During the time these events occurred on the nursing unit, nurses were reminded at their shift huddles that it is not practice to under set the volumes for pcas.
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