Automated Peritoneal Dialysis (APD)

Automated peritoneal dialysis (APD) uses a cycler machine to move dialysis fluid in and out of your abdomen while you sleep. The machine is connected to your peritoneal dialysis catheter and performs a series of fills, dwells, and drains in cycles that your nephrologist prescribes. Most people are on the cycler for roughly 8 to 10 hours at night, although the exact time, number of cycles, and fill volume are individualized based on your labs, weight, and how well you remove fluid and toxins. 

Continuous ambulatory peritoneal dialysis (CAPD) uses the same catheter and the same peritoneal membrane, but there is no machine. Instead, you perform manual exchanges by hanging a bag of fluid, letting it drain in by gravity, letting it dwell, then draining it out again into an empty bag. Many patients do about four manual exchanges per day, spread across waking hours.

The key difference is therefore not the type of dialysis itself, but how and when the exchanges are done: APD is usually done automatically at night with a cycler, whereas CAPD is done manually during the day.

For most people, APD is specifically chosen to protect daytime freedom. Because the cycler usually runs overnight for around 8 to 10 hours, your abdomen is either empty or has a single long daytime dwell during the day, which allows you to go to work, school, or look after children without stopping repeatedly to do manual exchanges. 

National Kidney Foundation and other kidney organizations point out that peritoneal dialysis can be done at home, at work, or even when traveling. The prescription is tailored to your schedule as long as the total time on treatment and the amount of fluid exchanged are sufficient. 

What this means in practice is that you and your nephrology team decide together how to balance overnight cycler time, any daytime dwell, and your work or caregiving responsibilities. The exact plan is individualized rather than one size fits all.

APD is designed to be used safely at home. Before starting, you and (if you wish) a family member receive structured training from our highly experienced team on how to connect and disconnect, set up the cycler, recognize alarms, and maintain a clean technique. Training programs typically include how to check your catheter exit site, how to handle minor issues, and when to call the unit urgently.

Modern cyclers contain multiple safety checks. They alarm if lines are kinked or disconnected, if there is a leak, or if drains and fills do not occur as expected. In training you are taught exactly what each alarm means and which steps you can safely take at home vs when to stop and contact the on-call nurse or doctor. 

Every program also creates a written back-up plan for power failures or cycler malfunction. A common plan is to switch temporarily to one or more manual CAPD exchanges until power or equipment is restored, using supplies that you keep on hand for this purpose. The exact plan depends on your prescription and is set by your own nephrologist, so it is important to know and follow that written protocol rather than improvising.

Traveling on APD is possible for many patients, but it requires advance planning. Kidney organizations describe two main approaches. Some patients bring a portable cycler with them and arrange to have dialysate and disposables shipped to their destination ahead of time through their supply company. Others temporarily switch to manual CAPD while they are away if that better suits the length and style of the trip. 

Practical details usually include confirming power availability, packing spare tubing and caps, protecting the machine in transit, and knowing exactly whom to call if there is a problem while you are out of town. Your own dialysis program and supply company set the rules for how far in advance orders must be placed and which countries or regions they can ship to, so you should always review your specific travel plan with your team before you book.

Peritoneal dialysis in any form carries a risk of peritonitis and catheter exit-site or tunnel infection, so strict cleanliness and exit-site care are essential whether you use APD or CAPD. Common signs of peritonitis include cloudy dialysis fluid, new abdominal pain, fever, or feeling generally unwell. If these appear, peritoneal dialysis programs instruct patients to contact the dialysis unit immediately because peritonitis does not resolve on its own and needs prompt antibiotics. 

When infection prevention protocols are followed, overall technique survival and infection rates are broadly similar between APD and CAPD in large series, and choice of modality is usually driven more by lifestyle and adequacy than by infection risk alone. Vascular access infections related to hemodialysis fistulas, grafts, or catheters are a different category of infection; deciding between peritoneal dialysis and hemodialysis therefore involves weighing different risk profiles, not the absence of risk.

Your personal risk depends on factors such as your past history of infections, diabetes control, nutritional status, and how consistently you can maintain clean technique. That is why the decision between APD, CAPD, and hemodialysis should always be made with your nephrologist instead of relying only on general statistics.

From a medical point of view, APD, CAPD, and hemodialysis can all provide adequate clearance when properly prescribed. National Kidney Foundation and other expert groups emphasize that the decision is usually based on a combination of:

• The condition of your abdomen and peritoneum, and whether you are anatomically suitable for a PD catheter.

• Other health issues such as hernias, severe lung disease, or repeated abdominal surgery, which may favor or limit one therapy.

• Your ability to manage home treatment tasks or the availability of a reliable care partner.

• Your priorities for schedule, independence, and how often you want to attend a dialysis center. 

APD is often chosen when someone wants most of their treatment to occur at night so that days are relatively free. CAPD may be chosen when a person prefers a simple gravity-based system without a machine. In-center hemodialysis may be preferred when home treatments are not feasible or when rapid solute removal three times per week is medically indicated. None of these choices should be made on search results alone; they require an assessment of your individual medical situation, goals, and support system by your nephrology team.