Dialysis

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Overview

Dialysis is a medical procedure that performs the essential functions of healthy kidneys when they can no longer adequately filter waste products, excess fluids, and toxins from the blood. It is a life-sustaining treatment for patients with end-stage renal disease (ESRD) or severe acute kidney injury. Dialysis does not cure kidney disease but helps maintain the body's internal balance until a kidney transplant becomes available or as a long-term treatment option. There are two primary types of dialysis: hemodialysis and peritoneal dialysis. Hemodialysis involves circulating the patient's blood through an external machine called a dialyzer (artificial kidney), where waste products and excess fluids are removed before the cleaned blood is returned to the body. This is typically performed three times per week at a dialysis center, with each session lasting approximately four hours. Peritoneal dialysis uses the patient's own peritoneal membrane (lining of the abdominal cavity) as a natural filter. A special dialysis solution (dialysate) is introduced into the abdominal cavity through a permanent catheter, where it absorbs waste products from the blood vessels in the peritoneum before being drained. Modern dialysis techniques have improved significantly, offering patients more flexibility and better quality of life. Home hemodialysis and automated peritoneal dialysis (APD) allow patients to perform treatments in the comfort of their homes, often during sleep. Proper nutrition, fluid management, and medication adherence are critical components of successful dialysis therapy. Patients on dialysis require ongoing care from a multidisciplinary team including nephrologists, dialysis nurses, dietitians, and social workers to manage complications such as anemia, bone disease, cardiovascular issues, and fluid overload.

Causes

1End-stage renal disease (ESRD) from progressive chronic kidney disease

2Severe acute kidney injury (AKI) that does not resolve

3Uncontrolled diabetes mellitus leading to kidney failure

4Severe hypertension causing malignant nephrosclerosis

5Glomerulonephritis and autoimmune kidney diseases

6Polycystic kidney disease with massive kidney enlargement

7Drug-induced kidney failure

8Irreversible kidney damage from infections or obstructions

Symptoms to Watch For

⚠Severe fatigue and weakness

⚠Nausea, vomiting, and loss of appetite

⚠Severe swelling (edema) and shortness of breath

⚠Confusion and difficulty concentrating

⚠Itching (pruritus) all over the body

⚠Muscle cramps and restless legs

⚠Decreased or absent urine output

⚠Metallic taste in the mouth

⚠Difficulty sleeping (insomnia)

⚠High blood pressure that is difficult to control

Risk Factors

●Diabetes mellitus (Type 1 and Type 2)
●Hypertension
●Family history of kidney disease
●Age over 60 years
●Cardiovascular disease
●Obesity
●History of autoimmune diseases
●Chronic use of nephrotoxic medications

Diagnosis

1Serum creatinine and BUN (Blood Urea Nitrogen) levels

2Estimated Glomerular Filtration Rate (eGFR) calculation

3Urinalysis and urine output measurement

4Renal ultrasound to assess kidney size and structure

5Comprehensive metabolic panel including electrolytes

6Complete blood count (CBC)

7Kidney biopsy when the cause of kidney failure is unclear

Treatment Options

Hemodialysis

Blood is pumped through an external dialyzer machine that filters waste products and excess fluids. Typically performed 3 times per week at a dialysis center, with each session lasting 3-5 hours. Home hemodialysis options are also available for eligible patients.

Peritoneal Dialysis (PD)

Dialysis solution is introduced into the abdominal cavity through a catheter. The peritoneal membrane acts as a natural filter, absorbing waste products. Can be performed at home with CAPD (continuous ambulatory peritoneal dialysis) or APD (automated peritoneal dialysis during sleep).

Vascular Access Creation

For hemodialysis, a vascular access is created through an arteriovenous (AV) fistula, AV graft, or central venous catheter. AV fistula is preferred as it provides better blood flow and has fewer complications.

Medication Management

Erythropoiesis-stimulating agents (ESAs) for anemia, phosphate binders, blood pressure medications, vitamin D supplements, and anticoagulants as needed.

Dietary Counseling

A renal dietitian helps patients manage their diet to control potassium, phosphorus, sodium, and fluid intake while ensuring adequate nutrition.

Kidney Transplant Evaluation

Eligible patients are evaluated for kidney transplantation, which offers the best long-term survival and quality of life compared to dialysis.

Prevention & Lifestyle Tips

✓Manage chronic conditions (diabetes, hypertension) aggressively

✓Follow a kidney-protective diet early in CKD

✓Avoid nephrotoxic medications and contrast dyes when possible

✓Quit smoking and maintain a healthy weight

✓Get regular kidney function screenings if at risk

✓Stay hydrated and treat kidney infections promptly

✓Work with a nephrologist to monitor kidney function regularly

Dietary Recommendations

🥗Limit potassium intake (avoid bananas, oranges, potatoes, tomatoes)

🥗Restrict phosphorus (avoid dairy, nuts, colas, processed foods)

🥗Limit sodium to less than 2,000 mg per day

🥗Control fluid intake between dialysis sessions

🥗Maintain adequate protein intake (1.0-1.2 g/kg/day) to prevent muscle wasting

🥗Limit processed and canned foods

🥗Choose fresh meats, breads, and cereals

🥗Take medications with meals as directed to manage phosphorus

When to See a Nephrologist?

Seek immediate medical attention if you experience severe shortness of breath, chest pain, sudden weight gain (more than 2 kg between dialysis sessions), severe swelling, confusion, or persistent nausea and vomiting while on dialysis. Regular follow-up with your nephrologist is essential for optimal dialysis management.

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Frequently Asked Questions

How long can you live on dialysis?

Life expectancy on dialysis varies depending on age, overall health, and adherence to treatment. On average, a 50-year-old on dialysis may live 10-15 years or more with proper care. Kidney transplantation generally offers longer survival and better quality of life than long-term dialysis.

Is dialysis painful?

Most patients experience minimal pain during dialysis. The insertion of the dialysis needle may cause brief discomfort. Some patients may experience muscle cramps, nausea, or low blood pressure during sessions. These side effects can usually be managed with proper fluid and dietary management.

Can you work while on dialysis?

Yes, many patients continue to work while on dialysis. Home dialysis options and flexible scheduling at dialysis centers allow patients to maintain employment. Inform your nephrologist about your work schedule so dialysis sessions can be arranged accordingly.

What is the difference between hemodialysis and peritoneal dialysis?

Hemodialysis filters blood through an external machine at a dialysis center or home, typically 3 times per week. Peritoneal dialysis uses the body's peritoneal membrane to filter blood, with dialysis solution placed in the abdomen, and can be done at home. The choice depends on lifestyle, medical condition, and patient preference.

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