Initial reporter address: (b)(6).The actual sample was not available; however, a photograph and video of the sample were provided for evaluation.Visual inspection observed air bubble in the access line.The reported condition was verified.It also identified that the line between the catheter and the access line is clamped.As the line between the catheter and access is clamped, and the blood pump is still running, it created air in the access line by cavitation.The cause of the condition was due to misuse of the set.The control unit should also present an alarm due to the air bubble detector.The return clamp line on the control unit also prevents air from passing to the patient.A batch review was conducted and there were no deviations found related to this reported condition during the manufacture of this lot.Per the gui, the access and return lines should be always connected directly to the catheter/ blood access device.No additional devices between the return line and the blood access device should be connected.The use of additional devices, such as three-way valves, stopcocks, or extension lines, may impair return pressure monitoring.Their use can impede the detection of return disconnections, potentially resulting in severe blood loss.Should additional relevant information become available, a supplemental report will be submitted.
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