Kidney transplantation is a form of kidney replacement therapy (KRT) in which a healthy kidney from a donor is surgically implanted into a recipient with irreversible kidney failure, replacing the function of the failed kidneys.

It is considered the preferred long-term treatment option for suitable patients with end-stage kidney disease because it provides improved survival, better quality of life, and greater independence compared with long-term dialysis in appropriately selected candidates.

A successful kidney transplant recipient (KTR) can achieve full rehabilitation, return to normal daily activities, participate productively in society, and experience improved physical and psychosocial wellbeing.

Kidney transplantation requires careful recipient selection, donor evaluation, lifelong monitoring, and adherence to immunosuppressive therapy to prevent graft rejection and maintain kidney function.

Epidemiology

End-stage kidney disease is a growing global health problem, with increasing numbers of patients requiring kidney replacement therapy. Kidney transplantation provides the best long-term outcomes for many eligible patients; however, access remains limited in many low- and middle-income countries due to availability of donors, specialist services, infrastructure, and financial constraints.

In Tanzania and other developing settings, expansion of transplantation programs aims to improve access to renal replacement therapy and reduce dependence on long-term dialysis.

Indications for Kidney Transplantation

Kidney transplantation is indicated for patients with:

• End-stage kidney disease.

• Chronic kidney disease stage 5 requiring kidney replacement therapy.

• Progressive irreversible loss of kidney function.

• Patients approaching the need for dialysis where pre-emptive transplantation is considered appropriate.

Common causes of end-stage kidney disease requiring transplantation include:

• Diabetic kidney disease.

• Chronic glomerular diseases.

• Hypertensive nephropathy.

• Polycystic kidney disease.

• Congenital kidney disorders.

• Chronic tubulointerstitial diseases.

Contraindications

Kidney transplantation may be unsuitable or delayed in patients with:

• Active uncontrolled infection.

• Active malignancy.

• Severe uncontrolled cardiovascular disease.

• Severe irreversible medical conditions limiting survival.

• Inability to adhere to lifelong treatment and follow-up.

• Uncontrolled substance misuse affecting treatment adherence.

Assessment should be individualized by a transplant team.

Donor Evaluation

Kidney donors may be:

Living donors

Examples include:

• Related family members.

• Spouses or emotionally related individuals according to national regulations.

Deceased donors

Organs obtained from suitable deceased individuals following established donation protocols.

Donor assessment includes:

• Medical history.

• Physical examination.

• Kidney function assessment.

• Screening for infections.

• Blood group compatibility.

• Tissue compatibility testing.

• Assessment of surgical suitability.

Recipient Evaluation

Before transplantation, recipients require comprehensive assessment including:

Medical assessment

• Kidney disease evaluation.

• Cardiovascular assessment.

• Infection screening.

• Cancer screening where appropriate.

• Assessment of other chronic diseases.

Laboratory investigations

Include:

• Full blood count.

• Kidney function tests.

• Electrolytes.

• Liver function tests.

• Blood glucose.

• Lipid profile.

• Viral screening:

  • HIV.

  • Hepatitis B.

  • Hepatitis C.

Immunological assessment

Includes:

• ABO blood group compatibility.

• Human leukocyte antigen (HLA) matching.

• Crossmatch testing to assess risk of rejection.

Kidney Transplant Procedure

The procedure involves:

1. Selection of an appropriate donor and recipient.

2. Compatibility testing.

3. Surgical implantation of the donor kidney, usually in the lower abdomen.

4. Connection of blood vessels and urinary drainage.

5. Initiation of lifelong immunosuppressive therapy.

The transplanted kidney may begin functioning immediately or may require a period of recovery depending on donor and recipient factors.

Immunosuppressive Therapy

Immunosuppressive medications are required lifelong to prevent rejection of the transplanted kidney.

Common immunosuppressive agents include:

• Tacrolimus.

• Cyclosporine.

• Mycophenolate mofetil.

• Mycophenolate sodium.

• Azathioprine.

• Prednisolone.

• Sirolimus.

• Everolimus.

Treatment regimens are individualized according to:

• Risk of rejection.

• Side effects.

• Kidney function.

• Drug levels.

• Clinical response.

Regular monitoring is essential because immunosuppressive drugs may cause complications.

Monitoring After Kidney Transplantation

Regular follow-up includes:

Clinical monitoring

• Blood pressure monitoring.

• Weight assessment.

• Assessment of fluid status.

• Evaluation for infection symptoms.

• Medication adherence assessment.

Laboratory monitoring

• Serum creatinine.

• Estimated GFR.

• Electrolytes.

• Drug levels where applicable.

• Urinalysis.

• Proteinuria assessment.

Monitoring aims to detect:

• Acute rejection.

• Drug toxicity.

• Infection.

• Recurrence of kidney disease.

Differential Diagnosis of Reduced Graft Function

A transplanted kidney with worsening function requires evaluation for:

1. Acute rejection

   • Immune-mediated injury causing reduced kidney function.

2. Calcineurin inhibitor toxicity

   • Kidney injury caused by medications such as tacrolimus or cyclosporine.

3. Acute kidney injury due to dehydration

   • Reduced kidney perfusion causing graft dysfunction.

4. Urinary obstruction

   • Blockage of urine flow from the transplanted kidney.

5. Urinary tract infection or pyelonephritis

   • Infection affecting graft function.

6. Recurrent original kidney disease

   • Return of the disease that caused kidney failure.

7. Chronic allograft nephropathy

   • Progressive long-term graft injury.

Complications

Early complications

• Acute rejection.

• Delayed graft function.

• Surgical complications.

• Bleeding.

• Infection.

Long-term complications

• Chronic graft dysfunction.

• Cardiovascular disease.

• Opportunistic infections.

• Malignancies.

• Medication toxicity.

• Diabetes after transplantation.

• Hypertension.

• Bone disease.

Prognosis

Kidney transplantation generally provides better survival and quality of life compared with long-term dialysis in suitable candidates.

Outcomes depend on:

• Donor and recipient characteristics.

• Immunological compatibility.

• Adherence to immunosuppressive therapy.

• Control of cardiovascular risk factors.

• Early detection and management of complications.

Successful transplant recipients can achieve functional independence and return to social and occupational activities.

Prevention of Transplant Complications

Preventive measures include:

• Lifelong adherence to immunosuppressive therapy.

• Regular transplant clinic follow-up.

• Infection prevention strategies.

• Vaccination according to transplant guidelines.

• Blood pressure control.

• Diabetes and cardiovascular risk management.

• Avoidance of nephrotoxic medications.

• Early reporting of symptoms suggestive of infection or rejection.

Referral

Patients with:

• Chronic kidney disease stage 5.

• Progressive decline in kidney function.

• Need for kidney replacement therapy.

• Potential transplant eligibility.

should be referred early to a nephrologist and transplant center for assessment and planning.

Early referral allows:

• Evaluation for pre-emptive transplantation.

• Donor assessment.

• Preparation before dialysis becomes necessary.