Catheter-Related Superficial Venous Thrombosis of the Upper Extremity: A Narrative Review of Current Evidence, Diagnostic Pathways, and Management Strategies.

Catheter-related superficial venous thrombosis (SVT) of the upper extremity is a frequent complication of peripheral venous cannulation and longer peripheral devices such as midline catheters and peripherally inserted central catheters (PICCs). Although historically regarded as a benign and self-limited condition, upper-extremity SVT is increasingly recognized as a clinically meaningful entity within a continuum that includes chemical or mechanical phlebitis, extensive superficial thrombophlebitis, catheter-related deep vein thrombosis (UEDVT), septic thrombophlebitis, and rarely pulmonary embolism. Contemporary practice remains heterogeneous, largely because high-quality evidence supporting specific antithrombotic strategies in catheter-provoked upper-extremity SVT is limited. Duplex ultrasonography is central to modern management, as it confirms the diagnosis, quantifies thrombus extension, defines proximity to the deep venous system, and rules out concomitant UEDVT. Available data suggest that many patients with limited cannula-provoked SVT can be managed conservatively after catheter removal and symptomatic therapy, whereas patients with active cancer, extensive thrombosis, progression, or proximity to the axillary subclavian system may warrant anticoagulation on an individualized basis. Septic thrombophlebitis requires urgent catheter removal, blood cultures, targeted intravenous antibiotics, and multidisciplinary management. Prevention through vascular access stewardship, optimal device selection, and attention to catheter-to-vein ratio is likely the most impactful approach to reduce the burden of disease.