Venous · IR Playbook

Implantable Venous Port Placement (chemoport)

Implantable venous port placement creates totally subcutaneous, durable central venous access for repeated therapy. Ultrasound-guided venipuncture and fluoroscopic catheter positioning reduce mechanical complications; infection, thrombosis and device malfunction are the principal delayed risks.

Indications

• Long-term chemotherapy, immunotherapy or repeated intravenous medication
• Long-term parenteral nutrition or frequent blood sampling
• Poor peripheral venous access requiring intermittent durable access

Relative contraindications

• Uncorrected coagulopathy or severe thrombocytopenia
• Central venous thrombosis or obstruction
• Active systemic infection, local cellulitis or impaired wound healing

Equipment

• Ultrasound with sterile probe cover
• 21G micropuncture needle, 0.018-inch wire and introducer
• 0.035-inch J-tip guidewire
• 6–8 Fr peel-away sheath and dilator
• Single- or double-lumen implantable port with 6–8 Fr catheter and tunneller
• Non-coring Huber needle, saline, local anaesthetic and wound-closure set

Procedure steps

1. Confirm venous patency with ultrasound and mark a comfortable anterior chest pocket away from wounds, skin folds and anticipated radiotherapy fields.
2. Apply maximal sterile-barrier precautions, disinfect the neck and chest with an alcohol-based antiseptic unless contraindicated, and infiltrate local anaesthetic.
3. Puncture the vein under real-time ultrasound, confirm venous blood return and advance the guidewire centrally under fluoroscopy.Pearl: Maintain visualization of the needle tip throughout venipuncture.
4. Make a small chest incision and form a pocket large enough to accommodate the reservoir without tension or excessive depth.
5. Tunnel the catheter from the pocket to the venous entry site without kinking and connect it securely to the reservoir.
6. Introduce the catheter through the peel-away sheath and position its tip in the lower SVC near the cavoatrial junction, approximately 2–3 cm below the carina.
7. Confirm free aspiration and flushing through a Huber needle, exclude kinking or malposition fluoroscopically, secure the reservoir when required and close the pocket in layers.

Complications

• Arterial injury or expanding hematoma
• Pneumothorax or hemothorax
• Port-pocket or catheter-related infection
• Venous thrombosis or fibrin-sheath malfunction
• Catheter fracture, migration or drug extravasation

Exam pearls

• Real-time ultrasound should be used for venipuncture
• Avoid subclavian costoclavicular compression because it can cause pinch-off syndrome
• Never force-flush a resistant port; exclude malposition, thrombosis, fracture and extravasation
• Routine antibiotic prophylaxis for uncomplicated port placement is not supported by high-quality evidence

Viva questions

What is the preferred access for a chest port?

Ultrasound-guided internal jugular access, commonly right-sided, provides a straight course and avoids costoclavicular pinch-off.

Where should the catheter tip lie?

In the lower SVC at or near the cavoatrial junction, approximately 2–3 cm below the carina on fluoroscopy.

Why is a Huber needle used?

It is a non-coring needle that penetrates the silicone septum without removing material and prolongs port durability.

What suggests a fibrin sheath?

The port can often be flushed but blood cannot be aspirated; a port contrast study demonstrates retrograde contrast tracking along the catheter.

References