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Objective:This study investigated the feasibility of using digital pressure monitoring of the flushing bag via the central venous line system, and its efficacy for maintaining the patency of arterial catheters in patients after open-heart surgery.Methods:Between January 2011 and April 2014, 309 patients with central vein and artery catheterization after open-heart surgery were recruited as either an experimental (n =144) or control (n=165) group.In the experimental group,pressure changes in the flushing bag were digitally monitored by a pressure transducer via the central venous pressure monitoring system.In the control group, the pressure change was checked manually every 4 hours via the pressure indicator on the bag.The patency of the central venous and arterial catheters was recorded at 1 and 2 days after catheterization.