Permacath Insertion Procedure — A Step-by-Step Guide for Patients in Lahore
Knowing What to Expect Makes the Experience Significantly Less Daunting
When a nephrologist tells a patient in Lahore that they need a permacath inserted before dialysis can begin, the immediate response is usually anxiety about the procedure itself. What will happen? Will it hurt? How long will it take? What will I feel? These are entirely reasonable concerns, and they deserve clear, honest answers rather than vague reassurances. At Alnoor Diagnostic Centre in Shadman, Lahore, we perform permacath insertions in a fully equipped interventional radiology suite with imaging guidance, and we believe every patient deserves to understand exactly what the procedure involves before they arrive.
What Is a Permacath and Why Is It Inserted?
A permacath — formally called a tunnelled central venous catheter — is a large-bore, soft, flexible catheter with two separate channels called lumens. One lumen withdraws blood from the body to the dialysis machine. The other returns the cleaned blood. It is inserted into a large central vein — most commonly the internal jugular vein in the neck — and tunnelled under the skin of the chest wall before exiting through a separate small incision. This tunnelling reduces infection risk by creating distance between the vein entry point and the external catheter exit.
A permacath is inserted when haemodialysis must begin urgently before an AV fistula has been created or matured, or when a fistula is not possible due to vascular anatomy or other clinical factors.
Before the Procedure — Preparation
Blood tests and assessment — Before insertion, routine blood tests confirm that clotting function is adequate and that any blood-thinning medications have been appropriately managed. Your nephrologist and interventional radiologist will review your medical history, any allergies, and current medications. Blood-thinning medications such as warfarin, clopidogrel, or newer anticoagulants may need to be paused beforehand — never adjust these without explicit medical guidance.
Fasting — You will be asked to fast for four to six hours before the procedure as a standard precaution for any procedure involving sedation. Essential medications can be taken with a small sip of water unless specifically instructed otherwise.
Practical arrangements — Wear loose, comfortable clothing with easy access to the neck and chest area. Arrange for someone to accompany you home afterward as mild sedation affects driving capacity for several hours. The procedure itself is same-day in the majority of cases.
Step One — Arrival and Setup
When you arrive at the interventional radiology suite, the nursing team confirms your identity, reviews your medical history and fasting status, and establishes an intravenous line in your arm for sedation and medication delivery. Monitoring equipment is attached — an oxygen saturation probe, blood pressure cuff, and cardiac monitor — to maintain continuous observation of your vital signs throughout the procedure.
You will be positioned lying flat on the procedure table with your head turned slightly to one side to expose the neck. The skin over the neck and upper chest is thoroughly cleaned with antiseptic solution and sterile drapes are applied, leaving only the working area exposed.
Step Two — Local Anaesthesia and Sedation
Local anaesthetic is injected into the skin and deeper tissues at both the vein puncture site in the neck and the catheter exit site on the chest wall. This produces a brief stinging sensation that resolves within seconds. Mild intravenous sedation is administered to keep you relaxed and comfortable throughout. Most patients remain awake and able to communicate but feel calm and largely unaware of the detailed steps occurring.
Step Three — Vein Access Under Ultrasound Guidance
Using real-time ultrasound imaging, the interventional radiologist visualises the internal jugular vein in the neck directly on screen. Ultrasound guidance is critical — it shows the exact position of the vein, confirms its patency, and identifies the adjacent carotid artery that must be avoided. A fine needle is advanced under continuous ultrasound visualisation into the vein. The use of imaging guidance for this step significantly reduces the risk of complications compared to blind landmark-guided insertion.
Once the needle is correctly positioned within the vein, a guidewire is threaded through it into the central venous system. The needle is then removed, leaving the guidewire in place as a rail over which subsequent instruments will be advanced.
Step Four — Tunnel Creation
With the guidewire securing venous access, the interventional radiologist creates the subcutaneous tunnel through which the catheter will run. A blunt tunnelling device is passed under the skin from the planned catheter exit site on the chest wall upward to the neck puncture site. This tunnel sits entirely under the skin surface and creates the pathway through which the catheter body will travel.
The catheter is then pulled through this tunnel so that its tip end emerges at the neck guidewire site while its external end — the two coloured hubs through which blood flows during dialysis — exits at the chest wall. A small Dacron cuff on the catheter sits within the tunnel just inside the chest exit site. Over several weeks, fibrous tissue grows into this cuff, anchoring the catheter securely and forming an additional barrier against infection tracking inward.
Step Five — Catheter Placement Under Fluoroscopy
With the catheter positioned through the tunnel, its tip is advanced over the guidewire under fluoroscopic guidance — real-time X-ray imaging — into the superior vena cava and down toward the right atrium. Correct tip position is critical for optimal dialysis blood flow and to avoid cardiac arrhythmias. The fluoroscopy screen shows the catheter tip position in real time as it is advanced, allowing precise final placement at the cavoatrial junction — the ideal functional position.
Once tip position is confirmed on fluoroscopy, the guidewire is removed. The two external catheter lumens are flushed with heparin solution to prevent clotting and capped securely.
Step Six — Securing the Catheter and Wound Care
The catheter is secured at the neck entry site with a small suture and a sterile dressing applied. The chest wall exit site receives its own sterile dressing. A final chest X-ray is performed to confirm catheter position and exclude pneumothorax — a small risk of any central venous procedure that is monitored for as standard.
The entire procedure from skin preparation to final dressing typically takes 45 to 60 minutes.
After the Procedure — What to Expect
Most patients feel well within an hour of the procedure completing and are discharged the same day after a period of observation. Mild soreness at the neck and chest exit sites is normal for the first few days and managed comfortably with simple oral pain relief.
The catheter exit site requires regular cleaning and dressing changes — your dialysis nursing team will provide detailed instructions on exit site care. Keeping the site dry and clean is essential for preventing catheter-related infection. Avoid submerging the catheter in water — showers with the dressing protected are acceptable but baths and swimming are not.
The permacath can be used for dialysis immediately after insertion — this is one of its primary advantages. Your dialysis team will manage the catheter at each session with strict sterile technique to minimise infection risk.
Permacath Insertion at Alnoor Diagnostic Centre, Lahore
At Alnoor Diagnostic Centre in Shadman, Lahore, our interventional radiology team performs permacath insertions under ultrasound and fluoroscopic guidance in a fully equipped procedure suite. Every insertion is performed with imaging guidance as standard — because precision at every step directly reduces complication risk and improves the functional outcome of the catheter.