Venous · IR Playbook

Ultrasound-Guided Nontunneled Central Venous Catheter Placement (CVC)

Ultrasound-guided nontunneled central venous catheter placement establishes short-term access to a central vein for vasoactive drugs, irritant infusions, hemodynamic monitoring, rapid resuscitation or difficult venous access. Real-time ultrasound improves first-pass success and reduces mechanical complications; the major preventable hazards are arterial injury, pneumothorax, infection and guidewire loss.

Indications

• Vasoactive, vesicant, hyperosmolar or otherwise centrally administered infusion.
• Rapid fluid or blood-product administration, central venous pressure monitoring or repeated blood sampling.
• Inadequate peripheral access when a short-term central device is appropriate.

Relative contraindications

• Target-vein thrombosis, local infection, distorted anatomy or prior central venous occlusion.
• Severe coagulopathy in a complex or noncompressible access situation; individualize correction according to bleeding risk and local protocol.

Equipment

• High-frequency linear ultrasound transducer with sterile cover and single-use sterile gel.
• Cap, mask, sterile gown, sterile gloves, full-body drape and >0.5% chlorhexidine in alcohol.
• 1% lidocaine, syringes and 21–25 G infiltration needle.
• Adult CVC kit: 18 G access needle, 0.035-inch J-tip guidewire, scalpel, dilator and 7 Fr 15–20 cm double- or triple-lumen catheter.
• Saline flushes, suture or sutureless securement device and sterile transparent dressing.

Procedure steps

1. Confirm indication, side, patient identity and equipment. Scan the target vein and adjacent artery immediately before puncture.
2. Position for venous filling and operator ergonomics. Apply maximal sterile barriers, prepare the skin with alcoholic chlorhexidine, allow it to dry and cover the transducer sterilely.
3. Infiltrate 1% lidocaine while avoiding distortion of the vein.
4. Under real-time ultrasound, keep the needle tip visible until it enters the vein. Confirm free nonpulsatile blood return without relying on colour alone.
5. Advance the J-tip guidewire without force while maintaining control of its external end. Scan proximally to confirm the wire is intravascular before dilation.Pearl: Never dilate unless venous wire position is confirmed.
6. Make a small skin nick, pass the dilator only as far as required and remove it while retaining the wire. Advance the catheter to the planned depth, then remove the wire completely.
7. Aspirate and saline-flush every lumen, clamp and cap it, then secure the catheter and apply a sterile dressing. Confirm tip location and exclude complications with the locally approved method, such as chest radiography, fluoroscopy, intracavitary ECG or focused ultrasound, before nonemergency use.

Complications

• Arterial puncture or hematoma
• Pneumothorax, hemothorax or vascular perforation
• Malposition, arrhythmia, air embolism or retained guidewire
• Catheter-related infection or venous thrombosis

Exam pearls

• Ultrasound guidance means continuous needle-tip visualization, not merely marking the vein before puncture.
• Wire in vein before dilator in skin is the key mechanical safety rule.
• Use the fewest lumens required, avoid routine prophylactic antibiotics and remove the line as soon as it is no longer essential.

Viva questions

Why is real-time ultrasound preferred?

It improves cannulation success and reduces attempts, arterial puncture and other mechanical complications. A pre-puncture scan alone is not equivalent to real-time needle-tip visualization.

What is the most important safety step before dilation?

Confirm that the guidewire is intravascular, preferably by ultrasound scanning proximal to the puncture site. Never dilate on blood colour or aspiration alone.

Where should an upper-body CVC tip lie?

A usual target is the lower third of the SVC or cavoatrial junction. The 2025 Association of Anaesthetists guidance also accepts the high right atrium, subject to device type and local policy.

What should you do if a large-bore catheter enters the carotid artery?

Do not remove it blindly. Leave a dilator or catheter ≥6 Fr in situ and obtain urgent vascular surgery or interventional radiology assistance for controlled removal and arterial repair.

References