Treatment-Refractory Mania with Psychosis in a Post-Transplant Patient on Tacrolimus: A Case Report

Delayed-Onset Psychosis Secondary to Tacrolimus Neurotoxicity After Lung Transplant: A Case Report and Systematic Review

BACKGROUND

Tacrolimus is the most common immunosuppressant used after transplant, yet it can result in moderate-to-severe neurotoxicity in up to 32% of patients. Signs of neurotoxicity can vary from mild (tremor or headache) to severe (posterior reversible encephalopathy syndrome or psychosis. Prompt recognition and management is needed to lead to symptom resolution.

OBJECTIVE

The objective of this study is to describe the clinical presentation of tacrolimus-induced psychosis, a type of tacrolimus-inducted neurotoxicity, and distinguish it from other central nervous system disturbances, including delirium.

METHODS AND RESULTS

We present a case of delayed onset tacrolimus-induced psychosis with focus on unique clinical features and management strategies. We conducted a systematic review of cases of tacrolimus-induced psychosis using the PubMed database and included 15 manuscripts in our review.

CONCLUSIONS

Tacrolimus-induced psychosis is a unique presentation of tacrolimus-related neurotoxicity and can present without the cardinal symptoms of delirium. The data on isolated psychotic symptoms are limited with current literature focusing on more common presentations of tacrolimus-induced neurotoxicity, such as delirium and tremor. Development of psychosis can occur later in the treatment course and at normal tacrolimus serum levels. It can improve with antipsychotic therapies, but primary management should include cross-titration to an alternate immunosuppressant regimen.

New-onset Psychosis in an Immunosuppressed Patient With Kidney Transplantation: An Educational Case Report

Rationale

New-onset psychosis in an immunosuppressed patient post-kidney transplantation (KT) is a diagnostic challenge. A broad differential diagnosis merits consideration; however, an approach to this differential diagnosis remains to be outlined in the literature. Also, when and how to modify the maintenance immunosuppressive regimen remains a significant area of controversy.

Presenting concerns

A 23-year-old male, known for X-linked Alport syndrome for which he had undergone KT 1 year prior, presented with a 1-week history of disorganized speech, bizarre behavior, religious delusions, and visual hallucinations.

Diagnoses

After ruling out infectious, metabolic, autoimmune, and structural causes, immunosuppressant medications were changed from tacrolimus to cyclosporine. The patient did not improve after this change, and a second opinion consultation with a transplant psychiatrist led to a diagnosis of primary first-episode psychosis, later refined to bipolar disorder type I.

Interventions

The patient was started on risperidone, which led to a significant improvement in his symptoms.

Outcomes

Twelve months after discharge, his mood and behavior had returned to baseline on aripiprazole, bupropion, and citalopram. However, he developed acute allograft rejection, prompting a change from cyclosporine back to tacrolimus, with stability of his mental state and graft function.

Teaching points

This report offers learners an extensive and organized differential diagnosis to the work up of psychosis post kidney transplantation. A complete history, with input from collateral sources, and a systematic approach to the differential diagnosis, are crucial and should not be overshadowed by the risk of immunosuppressant-related neurotoxicity. We underscore the importance of multi-disciplinary management and comprehensive psychosocial assessment and re-assessment to refine the diagnosis. We also report the successful re-introduction of tacrolimus once the diagnosis of a primary psychiatric disorder is confirmed. Finally, we offer a simplified approach that can aid in distinguishing between a primary psychiatric diagnosis versus tacrolimus-associated psychosis.