Short Versus Long Timing of Flushing of Totally Implantable Venous Access Devices When Not Used Routinely: A Systematic Review and Meta-analysis

Background: Flushing and locking of totally implantable venous access devices (TIVADs) is recommended to maintain their patency when not in use. Although manufacturers' recommendations indicate monthly access for TIVAD maintenance, there is a tendency in real life to prolong this interval. Objectives: To assess the effectiveness of prolonged versus short flushing and locking intervals to prevent TIVAD occlusions in adults with cancer. Methods: A systematic search was carried out in MEDLINE, EMBASE, CINAHL, and Web of Science. Two reviewers independently selected studies, assessed quality, and extracted data. Study findings were summarized, and a meta-analysis conducted. Results: Six articles were included in the review, with a total of 1255 participants. Differences in types of cancers, flushing and locking techniques, and volume and concentration of heparin were described. Pooled results from 4 studies showed fewer catheter occlusions in favor of prolonged flushing and locking intervals (relative risk, 0.81), even if not statistically significant (95% confidence interval, 0.41-1.61) with no heterogeneity among studies (I2 = 0.00%, P = .69). The quality of evidence was very low. Conclusions: Very low-quality evidence suggests that prolonged schedule flushing and locking intervals has no effect on catheter patency. However, because of low number and poor quality of evidence derived from the studies analyzed, findings of this meta-analysis should be interpreted with caution. Implications for practice: No statistically significant difference in occlusion rate between short and long timing of flushing was found. However, further studies are necessary to strengthen the safe implementation of longer intervals in clinical practice.