How Cathflo Activase Clears Clogged IV Lines
Cathflo Activase (alteplase) is a recombinant tissue plasminogen activator (tPA) that dissolves clots in central venous access devices (CVADs) like PICC lines or ports. It works by converting plasminogen to plasmin, the main enzyme that breaks down fibrin in blood clots blocking the line. Clinicians inject a 2 mg dose into the clogged line, let it dwell for up to 2 hours (checking patency at 30 and 120 minutes), then aspirate the dissolved clot and flush with saline.[1][2]
What Causes IV Line Clogs That Cathflo Targets
Most clogs (80-90%) stem from fibrin sheaths or thrombi forming around the catheter tip from blood stasis or infusion reactions. Cathflo specifically targets these fibrin-based occlusions; it does not dissolve crystalline precipitates from drugs like lipids or calcium.[1][3]
Step-by-Step Administration Process
1. Pause infusions and aspirate what you can from the line.
2. Instill 2 mg/2 mL Cathflo (no further dilution needed).
3. Clamp the line; wait 30 minutes, then assess flow. If no restoration, leave for another 90 minutes (total 120).
4. Aspirate the solution and clot debris, then flush with 3-5 mL saline and 5 mL heparin (if ordered).
Success rate exceeds 90% in trials for catheter-related clots.[2][4]
How It Differs from Mechanical or Other Methods
Unlike manual declotting (pushing/pulling saline) or guidewires, Cathflo enzymatically lyses the clot from inside without risking line damage. It outperforms urokinase (discontinued) in speed and safety, with no need for systemic dosing.[1][5]
Potential Risks and When It Fails
Bleeding is rare (1-2%) since it's localized, but watch for hematoma at the site. Failures occur in non-fibrin clogs (e.g., drug precipitates), infections, or malpositioned lines—then consider line replacement. Contraindicated in active internal bleeding or recent stroke.[2][6]
Alternatives if Cathflo Doesn't Work
- Ethanol lock for lipid/precipitate clogs.
- Sodium bicarbonate for calcium-based blockages.
- tPA alternatives like reteplase (off-label) or surgical removal.[3][5]
[1]: Cathflo Package Insert (Genentech)
[2]: PubMed: Alteplase for CVAD Occlusion (COOL Study)
[3]: INS Standards of Practice (2021)
[4]: JVAD Journal Review
[5]: Comparison of Thrombolytics (Pharmacotherapy 2002)
[6]: FDA Labeling Warnings