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Updated: Feb 13, 2026

Microsurgical Skills of Establishing Permanent Jugular Vein Cannulation in Rats for Serial Blood Sampling of Orally Administered Drug
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Right Site, Wrong Route - Cannulating the Left Internal Jugular Vein.

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Central venous catheter placement in the left internal jugular vein can be complicated by rare anatomical variations, such as a duplicated superior vena cava (SVC). Awareness of these venous anomalies is crucial for preventing serious patient complications.

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Area of Science:

  • Vascular anatomy
  • Medical imaging
  • Interventional cardiology

Background:

  • Central venous catheters are vital for administering medications and fluids.
  • The right internal jugular vein is the preferred insertion site, but the left may be used when necessary.
  • Anatomical variations can complicate central venous catheterization.

Observation:

  • A patient requiring a central venous line had it placed via the left internal jugular vein.
  • Post-insertion radiography revealed an unexpected catheter trajectory.
  • A prior CT scan showed an unreported left-sided superior vena cava (SVC).

Findings:

  • A duplicated left SVC, present in 0.3-0.5% of the population, was identified as the cause of the aberrant catheter course.
  • Such anomalies can lead to complications like hypotension or cardiac arrest if the coronary sinus is irritated.
  • A widened mediastinum on imaging may suggest a duplicated SVC.

Implications:

  • Clinicians must consider rare venous anomalies when performing left internal jugular central venous catheterizations.
  • Pre-procedural imaging review is essential for identifying potential anatomical challenges.
  • Recognizing and managing venous anomalies can prevent severe patient outcomes.