Dialysis is a life-sustaining treatment that performs the essential work of your kidneys when they can no longer function effectively (typically at 10% to 15% function). Its primary goals are to remove waste products like urea, balance electrolytes (potassium and sodium), and eliminate excess fluid from the body.
There are two primary types of dialysis, each with a different approach to filtering the blood.
1. Hemodialysis (HD)
In this method, your blood is pumped out of your body, filtered through an “artificial kidney” machine (a dialyzer), and then returned to you.
- Where it happens: Most commonly at a dialysis center, but can also be done at home with specialized training.
- The Access: Requires a minor surgery to create an “access site,” usually in the arm (called a fistula or graft).
- Frequency: Typically performed 3 times a week, with each session lasting about 4 hours.
- Pros: You have four “treatment-free” days a week; in-center sessions are managed by medical professionals.
- Cons: Can cause fatigue, low blood pressure, or muscle cramps after sessions; requires strict fluid and diet restrictions.
2. Peritoneal Dialysis (PD)
This method uses the lining of your own abdomen (the peritoneum) as a natural filter. A cleansing fluid (dialysate) is washed into your abdomen through a catheter, sits for a few hours to collect waste, and is then drained out.
- Where it happens: At home, often while you sleep or during your daily routine.
- The Access: Requires a permanent catheter placed in the abdomen.
- Frequency: Must be done every day. It can be done manually 4 times a day or via an automated machine (cycler) overnight.
- Pros: More needle-free; offers greater independence and fewer dietary/fluid restrictions compared to hemodialysis.
- Cons: Higher risk of infection in the abdomen (peritonitis); requires daily commitment and space at home for supplies.
Comparison at a Glance
| Feature | Hemodialysis (In-Center) | Peritoneal Dialysis (Home) |
| Schedule | 3 days / week (fixed) | Every day (flexible) |
| Duration | 4 hours per session | Continuous or overnight |
| Access | Arm (fistula or graft) | Abdomen (catheter) |
| Fluid Limits | Usually very strict | More flexible |
| Medical Support | Staff performs treatment | Self-managed |
Common Side Effects
While dialysis is life-saving, it can be taxing on the body. Common issues include:
- Fatigue: Feeling “washed out” after a session.
- Low Blood Pressure: Sudden drops during fluid removal.
- Muscle Cramps: Often caused by rapid fluid shifts.
- Infection Risk: Specifically at the access site or abdominal catheter.
Note: Dialysis is a treatment, not a cure. Many patients use dialysis as a “bridge” while waiting for a kidney transplant, while others remain on it long-term.