It was reported that a fresenius dialyzer and combi set clotted approximately one-hundred and four minutes into a patient¿s hemodialysis (hd) treatment.The treatment was interrupted with arterial and venous pressure alarms, in addition to a transmembrane pressure (tmp) alarm.The nursing staff inspected the system, and noted the blood coagulation.The clotting was reportedly, visible on the dialyzer membranes.Upon follow-up, it was confirmed that both the dialyzer and combi set were inspected for defects prior to use, and no defects were identified.It was unknown if there were any changes to the patient¿s blood flow rate during the treatment.The patient was dialyzing on a fresenius 4008s hd machine.It was unknown if the patient¿s blood was returned, and therefore, the patient¿s estimated blood loss (ebl) was also unknown.The patient completed their treatment after being re-setup with new supplies on the same machine.It was confirmed there was no patient injury, no adverse effects were experienced, and no medical intervention was required as a result of the reported event.The dialyzer and combi set were not available to be returned for physical evaluation as they were reportedly discarded.
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Plant investigation: as the device was not returned to the manufacturer, a physical evaluation could not be performed.A batch records review was conducted by the manufacturer for the reported lot.There were no non-conformances or abnormalities identified during the manufacturing process which could be associated with the reported event.The entire lot has been sold and distributed.In addition, a device history review was performed and confirmed that the results of the in-progress and final quality control (qc) testing met all requirements.The lot met all specifications for release.A product history review did not reveal a probable cause for the customer complaint.As a physical evaluation could not be performed, a definitive conclusion regarding the reported incident could not be reached and a cause could not be confirmed.
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