Peritoneal dialysis is a kidney replacement therapy that uses the patient's own peritoneal membrane inside the abdomen to filter waste products, excess fluids, and correct electrolyte imbalances when the kidneys fail. Unlike hemodialysis, which routes blood through an external machine, peritoneal dialysis takes place directly inside the body. The abdominal cavity acts as a natural filter, allowing water and dissolved substances to pass across the membrane from the blood into a specially formulated cleansing fluid called dialysate. This approach offers patients greater independence and a more flexible daily routine, making it a popular choice in many Nigerian healthcare settings where patients travel long distances for hospital-based care.
The peritoneum is a large, serous membrane that lines the abdominal cavity and wraps around the abdominal organs. It is richly supplied with tiny blood vessels, known as capillaries, which makes it an ideal surface for filtering blood. Two main physiological processes make peritoneal dialysis work:
Factors like scarring from past surgeries or chronic inflammation can alter membrane function, slowing down waste clearance and affecting treatment effectiveness.
There are two primary methods of performing peritoneal dialysis, depending on lifestyle and clinical needs:
Successful peritoneal dialysis requires specific medical hardware and sterile supplies. The permanent access point is a soft, flexible silicone or polyurethane tube called a Tenckhoff catheter, which is surgically placed into the peritoneal cavity with one or two Dacron cuffs that encourage tissue ingrowth to anchor the tube and prevent bacterial entry.
Dialysate solutions come in various glucose concentrations, usually expressed as percentages like 1.5%, 2.5%, or 4.25%. Higher percentages extract more fluid but can stress the membrane over time. Tubing sets, transfer sets, and sterile caps complete the necessary equipment kit for each exchange.
Each manual peritoneal dialysis session is called an exchange and consists of three distinct phases:
Infection is the greatest hazard in peritoneal dialysis, making strict hygiene and aseptic technique non-negotiable. Microorganisms can easily travel down the catheter tract or enter through connections, leading to severe abdominal infections.
Midwives and nurses must teach patients to wear a face mask, wash hands thoroughly with soap and water, and clean the exit site regularly with approved antiseptic solutions as prescribed. The catheter must be securely taped to the skin to prevent traction and micro-tears that invite pathogens.
Regular clinical evaluation keeps peritoneal dialysis safe and effective. Midwives and nurses must track the patient's exact fluid balance by comparing the volume of fluid put into the abdomen (infusate) against the volume that comes out (effluent). A positive balance means the patient retained fluid, while a negative balance indicates excess fluid was removed.
Routine assessments include checking body weight, measuring blood pressure, inspecting the catheter exit site for redness or discharge, and observing the clarity of the drained fluid. Cloudy effluent is a classic early sign of peritonitis and must be reported immediately.
Despite careful management, patients undergoing peritoneal dialysis can develop acute complications. Peritonitis is the most common and serious infection, presenting with severe abdominal pain, fever, and cloudy effluent. Antibiotics are typically added directly to the dialysate bag.
Mechanical problems can also occur, such as dialysate outflow failure, where fluid refuses to drain out. This is often caused by constipation, a kinked tubing set, or catheter migration. Midwives should check for bowel impaction and encourage gentle repositioning before panicking. If the abdomen becomes hard, rigid, and extremely painful, urgent medical review is mandatory.
Long-term success with peritoneal dialysis depends heavily on thorough patient education and reliable community support. Patients and their family caregivers must demonstrate competence in handwashing, sterile connection techniques, equipment troubleshooting, and accurate record-keeping before leaving the hospital.
Midwives should provide clear guidance on dietary adjustments, such as managing protein intake because some protein is lost during exchanges, along with monitoring sodium and fluid limits. Regular follow-up appointments and access to a 24-hour helpline give families confidence to manage chronic kidney disease at home.