Kidney Transplant Rejection Can Be Silent. Here Is How Doctors Catch It

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For patients living with kidney failure, a kidney transplant can mark the start of a new life. Freedom from regular dialysis sessions, the chance to resume normal activities and the potential for better overall health are all deeply rewarding. But a new journey begins after the operation: keeping the transplanted kidney healthy.

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Kidney transplant rejection remains one of the biggest obstacles on that road. Dr Manju Kamal, Senior Consultant, Nephrology, Apollo Adlux Hospital, Angamaly, Kochi, explained why the immune system can turn on a donated organ, how doctors detect the damage, and what patients can do to keep the kidney working for longer.

When The Body Sees A Stranger

The human immune system is programmed to recognise and attack anything it perceives as foreign. "The transplanted kidney, although a valuable gift from another human being, carries markers that are different from those of the recipient. The immune system can recognise these differences and mount an attack against the transplanted kidney," explained Dr Kamal.

Three Types Of Rejection, Three Timelines

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Rejection can occur in different forms and at different times after transplantation. The main types are hyperacute, acute and chronic rejection.

• Hyperacute rejection is rare and can occur within minutes to hours of transplantation, usually because the recipient already has antibodies that recognise the donor kidney.
• Acute rejection generally occurs within the first weeks or months, although it can happen at any time. It may be T-cell-mediated, in which immune cells attack the transplanted kidney, or antibody-mediated, in which antibodies attack the donor kidney.
• Chronic rejection develops gradually over a longer period and can lead to progressive loss of transplanted kidney function.

Why Some Patients Carry A Higher Risk

"The risk of rejection may be higher in individuals who have previously undergone a transplant, received blood transfusions, or experienced pregnancy, as these events can lead to the development of antibodies against foreign tissues," added Dr Kamal.

The Rejection You Cannot Feel

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What makes rejection particularly challenging is that it does not necessarily declare itself through symptoms. A person may feel completely well while injury is occurring at the level of the transplanted kidney. That is why regular blood tests and follow-up visits are an essential part of life after transplantation.

"Kidney dysfunction, including a rise in serum creatinine, may indicate that something is wrong. In such cases, additional tests, such as donor-specific antibody testing and a kidney biopsy, may be necessary to determine whether rejection is the cause of increasing creatinine," said Dr Kamal.

The stakes are high. A multicentre cohort study of 3,117 kidney transplant recipients found that an episode of acute rejection in the first year was associated with a 4.27-fold increase in the risk of graft failure.

Walking The Immunosuppression Tightrope

Fortunately, transplantation medicine has advanced significantly. "Immunosuppressive medications are used to reduce the risk of the body's immune system attacking the transplanted organ. Maintaining the right level of immunosuppression is critical. Too little can increase the risk of rejection, while too much can make the patient more susceptible to infections and other complications," explained Dr Kamal.

A More Personalised Way To Watch The Kidney

Treatment is also becoming increasingly personalised. One of the newer techniques used to detect injury to a transplanted kidney through a blood test is donor-derived cell-free DNA (dd-cfDNA). "Along with donor-specific antibody testing and advances in kidney biopsy interpretation, pathology and molecular diagnostics, these techniques can help doctors identify kidney injury and assess the possibility of rejection," added Dr Kamal.

Where The Patient Comes In

Much of the protection of a transplanted kidney depends on the patients themselves. Here is what Dr Kamal says:

• Taking immunosuppressive medications exactly as prescribed
• Attending regular follow-up appointments
• Monitoring blood tests
• Promptly reporting any new symptoms or problems

These steps play an important role in protecting the transplanted kidney.

Bottomline

A kidney transplant is more than an operation; it is an ongoing partnership between the patient and the transplant team. Although the risk of rejection remains an important concern, early identification of problems, improved monitoring and increasingly personalised treatment options are giving doctors new and better ways to protect the transplanted kidney and prolong its function.

Disclaimer: The information provided in this article is for general informational and educational purposes only and is not intended as a substitute for professional medical advice, diagnosis, or treatment. Always seek the advice of your physician or a qualified healthcare provider with any questions you may have regarding a medical condition.