A central venous catheter, often called a central line, is a long, thin tube inserted into a large vein near the heart to provide stable access to the central circulation. Central lines are used when peripheral intravenous access is insufficient, when certain medications or fluids must be delivered reliably, or when clinicians need to measure central venous pressure or obtain blood samples repeatedly without repeated needle sticks. They play an important role in intensive care, surgery, chemotherapy, and long-term intravenous therapies.

Design and common types

Central venous catheters vary in design according to purpose. Typical components include a flexible catheter shaft, one or more external lumens or ports, a hub or clamp, and sometimes a cuff or valve to reduce infection risk. Variants include:

  • Non-tunneled central lines — short-term use in acute settings.
  • Tunneled catheters — placed under the skin for longer-term therapy and often secured with a cuff.
  • Peripherally inserted central catheters (PICC) — inserted through an arm vein and advanced to the central veins.
  • Implantable ports — a subcutaneous reservoir accessed with a needle for intermittent therapy.

Placement sites and when they are chosen

Common insertion sites are selected based on patient anatomy, urgency, and infection or clotting risk. Typical veins used include the internal jugular vein in the neck, the subclavian vein beneath the clavicle in the chest, and the femoral vein in the groin. The choice balances ease of access, patient comfort, and complication profiles. Clinicians confirm correct tip location with imaging after placement.

Indications, uses and examples

Central lines enable several clinical tasks that peripheral IVs cannot reliably perform: delivery of vesicant or irritant drugs, continuous vasoactive infusions, high-volume fluid resuscitation, parenteral nutrition, hemodialysis, and repeated blood sampling. They are essential in intensive care units, operating rooms, oncology infusion services, and for patients requiring long-term intravenous therapies.

Risks, complications and care

Insertion and maintenance carry risks. Early complications can include bleeding, pneumothorax (air in the chest cavity), malposition, or inadvertent arterial puncture. Over time, catheters can become infected, form clots, or malfunction. Typical precautions include strict sterile technique during insertion, regular site inspection and dressing changes, flushing protocols to keep lumens patent, and removing the catheter as soon as it is no longer needed.

  • Infectious complications — local or bloodstream infections; prevention focuses on sterile insertion and maintenance.
  • Thrombosis — catheter-associated clot formation may require anticoagulation or removal.
  • Mechanical problems — breakage, occlusion, or catheter migration.

History and important distinctions

Central venous access developed alongside advances in critical care and vascular surgery. Modern techniques use ultrasound guidance and improved catheter materials to reduce complications. It is important to distinguish central venous catheters from peripheral IVs and peripheral-access devices such as midlines or PICC lines: central devices terminate in large central veins near the heart, supplying rapid dilution of infused substances, while peripheral devices remain in smaller, more distal veins. For additional clinical guidelines and patient information, see resources linked by clinicians: infusion and medication guidance and procedural references at institutional protocols (site selection, placement, infection control).