Efficacy of thrombolytic therapy for occlusion of long-term catheters

Area of Science:

• Vascular Access Management
• Interventional Radiology
• Thrombolytic Therapy

Background:

• Tunneled central venous access devices are crucial for ambulatory outpatients.
• Catheter occlusion is a common complication, necessitating interventions to restore patency.
• Previous studies reported high efficacy rates for thrombolytic therapy in clearing occluded catheters.

Purpose of the Study:

• To evaluate the efficacy of conventional low-dose urokinase therapy in restoring patency of occluded tunneled central venous access devices.
• To compare the observed success rates with previously reported efficacy rates of thrombolytic therapy.

Main Methods:

• Nineteen outpatients with occluded central venous access devices were treated with urokinase (5000 units/ml).
• Urokinase was instilled, allowed to dwell for 5-10 minutes, and then aspirated.
• Up to three treatment trials were permitted if initial attempts failed.

Main Results:

• Successful catheter clearance was achieved in 6 out of 19 occlusions (32% overall efficacy).
• Withdrawal occlusions had a 27% success rate (4/15), while resistance to infusion occlusions had a 50% success rate (2/4).
• The observed efficacy rate is substantially lower than the 57-100% reported in prior literature.

Conclusions:

• Conventional low-dose urokinase therapy demonstrates limited efficacy in clearing occluded central venous access devices.
• Discrepancies in efficacy may stem from variations in thrombolytic dosage, administration methods, monitoring frequency, and catheter dwell time.
• Further investigation into optimized thrombolytic protocols is warranted to improve catheter patency rates.