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Murine Model of Central Venous Stenosis using Aortocaval Fistula with an Outflow Stenosis
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Murine Model of Central Venous Stenosis using Aortocaval Fistula with an Outflow Stenosis

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Fluoroscopy-guided catheter tip positioning optimization: 10-30 mm beyond landmarks is associated with reduced

Fen Yu1, Liming Gan2, Mei Feng1

  • 1Department of Ultrasound, The Central Hospital of Wuhan, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, Hubei, China.

The Journal of Vascular Access
|February 6, 2026
PubMed

Insights

Fluoroscopy often misplaces catheter tips, increasing stenosis risk. Advancing tips 10-30mm further significantly reduces this risk, optimizing hemodialysis access.

Area of Science:

  • Vascular Access Procedures
  • Interventional Radiology
  • Nephrology

Background:

  • Current guidelines recommend fluoroscopy-guided placement of tunneled cuffed catheters in the right atrium.
  • Fluoroscopy may inaccurately identify the cavoatrial junction, potentially leading to suboptimal tip placement.
  • This discrepancy can impact the risk of central venous stenosis.

Purpose of the Study:

  • To quantify the difference between digital subtraction angiography (DSA) and fluoroscopy in locating the cavoatrial junction.
  • To assess the impact of this discrepancy on the risk of intrathoracic central venous stenosis.

Main Methods:

  • Retrospective cohort study of 90 patients with right internal jugular tunneled cuffed catheters.
  • Comparison of DSA and fluoroscopy for cavoatrial junction localization.
  • Classification of catheter tip position (superior vena cava vs. right atrium) and logistic regression analysis for stenosis risk.

Main Results:

  • The DSA-defined cavoatrial junction was consistently located 21.64 mm caudal to fluoroscopic landmarks.
  • Intrathoracic central venous stenosis occurred in 34.4% of patients.
  • Catheter tip placement in the superior vena cava was associated with a 5.78-fold increased risk of stenosis compared to right atrium placement (p=0.004).

Conclusions:

  • Fluoroscopy tends to overestimate the position of the cavoatrial junction.
  • Placing catheter tips 10-30 mm beyond fluoroscopic landmarks improves accuracy and reduces stenosis risk.
  • This optimization strategy significantly lowers the odds of intrathoracic central venous stenosis, enhancing hemodialysis access management.
Abstract

Keywords:
Intrathoracic central venous stenosisangiographycavoatrial junctionfluoroscopyrisk factors

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