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Purpose:   Retrospective studies suggest that it may be safe to extend the maintenance flushing interval of implanted ports from once every month, as recommended by the manufacturer, to once every 3 months, but no prospective cohort studies have been done specifically assessing the safety and feasibility of this intervention.Methods:   This was a phase II study in oncologic patients who retained a functional port after completion of systemic chemotherapy. Patients enrolled in the study had their port flushed once every 3 months and were observed until completion of five scheduled flushes (one on enrollment and four additional flushes, one every 3 months) or development of any port-related complication, including infections, thrombosis, and occlusions. The primary end points were frequency of port-related complications and port failure requiring removal.Results:   A total of 87 patients were enrolled in the study. The median follow-up time was 308 days, accounting for a total of 24,202 catheter-days. There were 10 port-related complications (11.49%; 95% CI, 4.85% to 18.14%). No infection or symptomatic thrombosis occurred. The mean time to port-related complication was 184 days. No patients developed port failure while on protocol, but on subsequent medical record review, four patients developed a complication that required port removal or port revision within 30 days of being removed from the trial (4.6%; 95% CI, 0.4% to 8.8%; 0.17/1,000 catheter-days).Conclusion:   Extending the maintenance flushes of implanted ports in adult oncologic patients to once every 3 months is safe, effective, and likely to increase patient adherence and satisfaction while decreasing the associated cost.

Phase II Trial on Extending the Maintenance Flushing Interval of Implanted Ports