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Increasing the success of liver transplants by managing levels of anti-rejection drugs

Approximately 600 children receive liver transplants each year in the United States. The use of immunosuppressant drug therapy, namely calcineurin inhibitors (CNIs) such as cyclosporine and tacrolimus, has decreased the risk of liver rejection and increased patient survival rates. While these medications can aid positive outcomes, high levels of CNIs can cause seizures and kidney damage, and low levels increase the risk of rejection of the transplanted liver. A study in the June issue of The Journal of Pediatrics discusses an approach to managing the levels of CNIs to keep them within a safe range for each patient in order to minimize risks and maximize success.

John C. Bucuvalas, MD, and colleagues from Cincinnati Children's Hospital Medical Center and Intermountain Health Center employed a method of controlling the blood levels of CNIs to stay within target ranges for individual patients. The study involved 217 patients, aged 6 months to 21 years, who received liver transplantation at least three months before the start of the study.

In the past, doctors relied on their experience to make decisions about how and when to change CNI dosages. The method in this study used a four-step process of care that allows the dose to be changed only when the CNI blood levels fall outside certain ranges based on each patient's previous responses to dosage changes. A team of transplantation experts used a statistical process control methodology and a novel Web-based system to review each patient's CNI levels to determine potential toxicity, possible modification of the patient's target range due to post-transplant complications, excessive variation of immunosuppressant levels in the blood, and if the CNI levels were within an acceptable range for that particular patient. The team then used the data to determine if the patient's medication required adjustment to keep the levels within a safe range.

Initially, only 50% of CNI levels were within the
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Contact: Monica Helton
journal.pediatrics@cchmc.org
513-636-7140
Elsevier Health Sciences
13-Jun-2005


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