Patient received approximately 30 minutes when alarms started stating "venous pressure low".Registered nurse (rn1) assessed cartridge noting bubbles in drip chamber.Rn1 attempted to remove bubbles by aspirating with 10ml syringe the bubbles.Unsuccessful, rn1 asked rn2 to assist with the situation when rn2 noticed blood in the transducer line."returned blood, but not all the blood".Changed out cartridge and restarted treatment.Manufacturer response for set, tubing, blood, with and without anti-regurgitation valve, tablo(r) cartridge (per site reporter).Outset medical has been notified in the past of this issue and they don't usually respond or they delay investigation.User facility has had multiple reports on this item in the last years with no resolve.
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