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"We describe a case of left internal jugular central venous access with rare malpositioning into the internal mammary vein" Koziatek et al (2023).
CVC tip malposition in mammary vein

Abstract:

Case presentation: We describe a case of left internal jugular central venous access with rare malpositioning into the internal mammary vein. Despite various confirmatory measures at the time of placement including ultrasonography of the internal jugular vein, as well as blood gas analysis consistent with venous blood by oxygen saturation and good venous flow in all three ports of the catheter, subsequent imaging confirmed misplacement into the internal mammary vein.

Discussion: Central venous access is a frequently used procedure by emergency physicians for a variety of indications. Emergency physicians must be facile with both the technical process of central venous catheter placement, as well as possible pitfalls and complications of the procedure. Common complications, such as bleeding, pneumothorax, arterial injury, infection, and hematomas, are usually well known; less frequently encountered is malposition of the catheter despite seemingly appropriate placement.

Reference:

Koziatek CA, Idowu D, White R. A Rare Malposition of a Left Internal Jugular Central Venous Catheter into the Left Internal Mammary Vein. Clin Pract Cases Emerg Med. 2023 Feb;7(1):51-53. doi: 10.5811/cpcem.2022.12.58202. PMID: 36859327; PMCID: PMC9983341.