Persistent left superior vena cava and central venous catheter position: clinical impact illustrated by four cases

Area of Science:

• Vascular anatomy
• Embryology
• Medical imaging

Background:

• Vascular variations, such as a persistent left superior vena cava (LSVC), are frequently discovered incidentally.
• LSVC occurs in 0.3-0.5% of healthy individuals and 4% of those with congenital heart disease.
• Complications like shock and cardiac arrest can arise during catheterization in patients with LSVC.

Observation:

• The embryogenesis and anatomical variations of persistent LSVC are detailed.
• A novel classification system for superior vena cava anatomy is proposed based on central venous catheter positioning on chest radiographs.
• The classification includes Type I (normal), Type II (LSVC only), Type IIIa (connected right and left SVC), and Type IIIb (disconnected right and left SVC).

Findings:

• The study presents four clinical cases illustrating the proposed classification.
• The classification aids in identifying and categorizing LSVC variations.
• Difficulties in central venous catheterization may indicate underlying SVC anomalies.

Implications:

• Awareness of LSVC variations is essential for clinicians performing central venous catheterization.
• The proposed classification can improve the diagnosis and management of patients with SVC anomalies.
• Understanding these variations can prevent serious complications during medical procedures.