Peritoneal dialysis catheter placement — from exit-site planning to confirmed dialysate flow before chronic PD begins
Successful peritoneal dialysis (PD) begins long before the catheter is placed. The exit-site location is marked with the patient standing, sitting, and bending, evaluating the belt line, skin folds, prior scars, stomas, and the patient's own visual field and dexterity for self-care. A poorly sited exit — too close to the belt line, buried in a skin fold, or unreachable for the patient — is a well-documented driver of exit-site infection, catheter malfunction, and early technique failure.
The exit site is marked preoperatively — not decided intraoperatively — because the abdominal contour changes dramatically between the supine surgical position and the patient's usual standing or sitting posture.
Core siting principles: • Away from the belt line, waistband, and skin folds that would keep the site chronically moist or under friction • Away from old surgical scars, stomas, and areas of skin breakdown • Directed caudally or laterally so gravity and clothing do not pool moisture or debris at the sinus opening • Within the patient's own visual field and reach, since daily exit-site care depends on the patient (or caregiver) being able to see and clean it • Clear of the costal margin and any planned drainage bag tubing pathway
In patients who are obese, have a pannus, or use a wheelchair, the "standard" abdominal sites often fail these criteria — planning must be individualized.
Body habitus materially changes catheter geometry. In patients with a large pannus, a paramedian or presternal catheter pathway may be chosen so the exit site sits above the fold rather than being buried beneath overhanging tissue, where moisture and poor visibility promote infection.
Other patient-specific factors incorporated at this stage: • Dominant hand and reach — the exit site should be comfortably visible and accessible for self-dressing changes • Planned future access — avoiding conflict with future transplant incisions or existing vascular access sites • Occupational and lifestyle factors — belt use, uniform waistbands, wheelchair frame contact points • Bladder and bowel habits — a full bladder or constipation at the time of marking can shift landmarks
A multidisciplinary preoperative visit involving the PD nurse, surgeon, and patient is considered best practice, since the nurse who will train the patient on home exchanges is often best positioned to judge practical accessibility.
The chosen exit site, the deep-cuff pocket, and the planned tunnel course are marked on the skin with the patient in multiple positions, then photographed or diagrammed in the chart so the surgical team can reproduce the plan exactly on the day of the procedure — surgical draping and positioning otherwise obscure the standing anatomy that made the site appropriate in clinic.
A rushed or intraoperative-only site choice is one of the most preventable causes of early PD catheter dysfunction. Deliberate preoperative marking with the patient upright, and involvement of the PD nursing team, is consistently associated with fewer exit-site infections and better long-term catheter survival.
Once the site is marked, the catheter is placed through a subcutaneous tunnel into the peritoneal cavity, with its tip directed toward the pelvis — the most dependent part of the peritoneal cavity when the patient is upright, and the location least likely to be walled off by omentum or bowel loops. Insertion can be performed by open surgical dissection, laparoscopically, or percutaneously at the bedside; each approach trades off invasiveness, direct visualization, and the ability to manage omental interference at the time of placement.
Open surgical (dissection) technique: • Mini-laparotomy exposes the peritoneum under direct vision; the catheter is placed and the tip guided into the pelvis manually • Allows the surgeon to inspect for adhesions and perform a prophylactic omentopexy or partial omentectomy if a redundant omentum is present
Laparoscopic technique: • Small ports allow direct visualization of catheter tip placement, adhesiolysis, and fixation of the catheter to the pelvic peritoneum with sutures if desired • Particularly useful in patients with prior abdominal surgery, where undiagnosed adhesions are more likely
Percutaneous (Seldinger / blind) technique: • A needle-guidewire-dilator sequence is used, often at the bedside or under fluoroscopic/ultrasound guidance • Faster and less invasive, but does not allow direct correction of omental wrap or adhesions encountered after placement
Regardless of technique, the shared surgical goals are the same: a tunnel that runs caudally, a tip that rests deep in the pelvis, and cuffs seated in their intended tissue planes.
The catheter tip is directed toward the true pelvis — typically the rectovesical or rectouterine (Pouch of Douglas) space — because this is the most dependent region of the peritoneal cavity in an upright patient, allowing gravity to keep the tip bathed in dialysate and minimizing the chance it becomes trapped against bowel or abdominal wall.
Some surgeons place a fixation suture or use a self-locating coiled-tip design to reduce the risk of catheter tip migration out of the pelvis, a common and largely mechanical cause of poor drainage discovered later during the break-in period or first exchanges.
Before closing, the surgical team typically confirms free flow by instilling and draining a test volume of saline or dialysate through the catheter. Fluoroscopic imaging may be used, particularly after percutaneous placement, to document the tip position in the pelvis and the absence of kinking along the tunnel.
Tip migration out of the pelvis — most often cephalad, toward the upper abdomen — remains one of the leading mechanical causes of one-way or sluggish flow discovered when exchanges are first attempted. Confirming pelvic position at the time of insertion, whichever technique is used, meaningfully reduces this risk.
A PD catheter is anchored along its subcutaneous course by one or two cuffs made of Dacron (polyester) felt. Over the weeks after placement, host fibroblasts grow into the porous cuff material, creating a mechanical anchor and — critically — a biological barrier that physically and immunologically impedes bacteria from tracking up the tunnel from the skin surface toward the peritoneal cavity. The geometry of the tunnel and the number and position of the cuffs are deliberate design choices with direct infection-prevention consequences.
Each cuff is a short segment of porous Dacron felt bonded around the catheter shaft. After implantation, granulation tissue and fibroblasts infiltrate the felt's interstices over roughly two to three weeks, producing:
• Mechanical anchorage — the catheter is held firmly in the tissue plane, resisting inadvertent traction or extrusion • A biological seal — dense fibrous tissue around the cuff narrows and occludes the potential space along the catheter, making it far more difficult for bacteria on the skin surface to migrate down the tunnel to the peritoneum
A double-cuff configuration places a deep cuff in the rectus muscle or just beneath it, and a superficial cuff in the subcutaneous tissue roughly 2 cm from the skin exit — creating two sequential barriers rather than one, which is associated with a lower rate of tunnel and peritoneal infection than a single-cuff design in most series.
The subcutaneous tunnel connecting the deep cuff to the exit site can be constructed straight or with a pre-formed curve ("swan-neck") that arcs the catheter so the exit site always points caudally regardless of the entry trajectory.
A downward- or laterally-directed exit prevents fluid, sweat, and debris from pooling at the sinus opening and reduces tension on the tract from gravity, which is thought to reduce trauma-related exit-site inflammation over the long term of chronic use.
Peritonitis and exit-site/tunnel infection remain the leading causes of PD technique failure. Because the tunnel is a permanent conduit between the skin — which is never sterile — and the sterile peritoneal cavity, the physical barrier created by well-incorporated cuffs is one of the few durable, structural defenses against ascending infection, complementing (not replacing) meticulous daily exit-site hygiene.
International Society for Peritoneal Dialysis (ISPD) guidance emphasizes that a caudally-directed tunnel and well-incorporated cuffs are structural, one-time design decisions made at implantation — unlike hygiene practices, they cannot be corrected later without another procedure, which is why careful technique at placement has outsized influence on years of subsequent infection risk.
Immediately after placement, the exit site and subcutaneous tunnel are fresh surgical wounds. Beginning full-volume dialysis exchanges too soon raises intra-abdominal pressure against a tract that has not yet sealed, increasing the risk of pericatheter (early) leak, exit-site trauma, and delayed healing. Most protocols therefore observe a break-in period — commonly on the order of about two weeks where feasible — before transitioning to a full ambulatory exchange schedule.
A newly placed catheter tract has not yet developed the fibrous seal described in Stage 3 — that process takes roughly two to three weeks. During this window, high intra-abdominal pressure from a standing patient with a fully filled peritoneal cavity can force dialysate along the still-forming tract and out through the incision or exit site (pericatheter leak), or can mechanically stress the healing skin edges.
Where clinically possible, protocols therefore favor: • Delaying the first exchange by roughly one to two weeks after insertion • When exchanges cannot be delayed (urgent-start PD), using small fill volumes and having the patient supine during dwell time, since lying down substantially lowers intra-abdominal pressure compared with standing or sitting
During the earliest phase, many programs perform only periodic flushes with small volumes to confirm catheter patency, rather than true dwell-and-drain exchanges — deliberately avoiding sustained intraperitoneal pressure while the tunnel matures. As healing progresses toward the end of the break-in period, exchange volumes are gradually increased toward the patient's eventual prescribed fill volume.
Through the break-in period, the exit site is typically immobilized and kept covered with a sterile, non-occlusive dressing that is changed infrequently (rather than daily) to avoid disturbing the healing tract. Patients and caregivers are taught to watch for the early warning signs that break-in is not going well:
• Persistent pericatheter leakage or wet dressings • Increasing redness, swelling, or purulent drainage at the exit site • Pain out of proportion to a normal healing incision
Any of these findings typically prompts extending the break-in period, reducing exchange volumes further, or evaluating for a mechanical or infectious complication before proceeding.
Rushing the transition to full-volume, upright exchanges before the tract has matured is a well-recognized, largely avoidable cause of early leak and exit-site complications. A graded, patience-driven break-in period — even when shortened out of clinical necessity — is one of the simplest interventions that protects the long-term viability of the access.
Before a patient is committed to a chronic PD regimen, the catheter must demonstrate free, unobstructed inflow and outflow of dialysate. A catheter that is structurally well placed but does not drain reliably is not yet a functioning dialysis access — flow testing is the final checkpoint that converts an anatomically successful placement into a clinically usable one.
A functioning catheter allows dialysate to flow in by gravity from a raised bag without resistance or patient discomfort, and allows a full dwell volume to drain back out completely (or near-completely) into a lowered drainage bag within an expected time frame. Both directions are checked — a catheter can sometimes fill without difficulty yet drain poorly, or vice versa, and the pattern of dysfunction often points toward its cause.
When flow is sluggish or one-directional, common contributors include:
• Catheter tip malposition — migration out of the true pelvis, often cephalad, reducing gravity-assisted drainage • Omental wrap or adhesions — omentum or bowel loops enveloping the catheter tip, physically obstructing side holes • Intraluminal fibrin — clot or fibrin strands partially occluding the catheter lumen, sometimes cleared with a fibrinolytic flush • Constipation — a loaded bowel can mechanically displace or compress the catheter and is a frequently overlooked, easily treated contributor to poor flow • Kinking along the subcutaneous tunnel from an unfavorable tract geometry
Initial management typically favors simple, reversible measures — repositioning the patient, treating constipation with laxatives, or a heparin/fibrinolytic flush — before considering imaging-guided catheter manipulation or surgical revision.
Once free bidirectional flow is demonstrated — ideally combined with a healed, non-leaking exit site consistent with a completed break-in period — the catheter is considered ready to support the patient's prescribed chronic PD regimen, whether continuous ambulatory PD (CAPD) with manual exchanges or automated PD (APD) using a cycler overnight.
Flow dysfunction discovered early — before a patient has been discharged onto a full home regimen — is far easier to correct than dysfunction discovered after chronic therapy has started. Deliberately verifying free inflow and outflow, rather than assuming function from successful placement alone, is the last safeguard before committing a patient to PD as their long-term renal replacement therapy.