Certified Clinical Hemodialysis Technician (CCHT) Practice Exam 2025 - Free CCHT Practice Questions and Study Guide

Dialysis may become less efficient in a patient with a high Blood Urea Nitrogen (BUN) level primarily due to the risk of Dialysis Disequilibrium Syndrome (DDS). This condition can occur when there is a rapid change in blood urea levels during the dialysis process, particularly in patients who have significant uremia and a high BUN. When the concentration of urea is significantly high in the blood, rapid clearance of urea via dialysis can result in an osmotic gradient that may lead to fluid shifts, particularly into the brain. This can cause neurological symptoms such as headache, nausea, and in severe cases, seizures or coma.

To mitigate the risk of DDS, clinicians may adjust the dialysis prescription or take extra care during the treatment. This consideration is important as the primary focus during dialysis is not just to clear urea effectively, but also to do so without causing harm to the patient. Thus, when dealing with patients who present high BUN levels, careful monitoring and adjustments are essential to maintain patient safety and comfort during hemodialysis treatment.