Immunosuppression—Clinical and Animal Studies
Efficacy of tacrolimus in the treatment of refractory rejection in heart and lung transplant recipients

https://doi.org/10.1016/S1053-2498(99)00016-9Get rights and content

Abstract

Background

Refractory acute cellular rejection may occur despite triple-drug immunosuppression (cyclosporine A, steroids, azathioprine/mycophenolate mofetil). The purpose of this study was to determine the efficacy of tacrolimus rescue therapy in patients maintained on cyclosporine-based immunosuppression (CBI).

Methods

Between December 1993 and October 1996, 208 patients underwent thoracic organ transplantation at the Hospital of the University of Wisconsin at Madison. One hundred forty-nine patients underwent heart replacement; 59 underwent lung transplantation. One hundred thirty-nine of the heart transplant cohort received CBI preceded by induction therapy with OKT3. Forty-six of the lung transplant cohort received CBI without induction cytolytic therapy. Refractory rejection was defined as failure to respond to high-dose steroids (500 mg to 1 g IV methylprednisolone for 3 days) and/or monoclonal antibody therapy (OKT3, 5 to 10 mg IV/day for 7 to 14 days). In patients with refractory rejection, cyclosporine was replaced with tacrolimus.

Results

Overall, 16% (30/185) of patients receiving CBI experienced refractory rejection. Thirty-one episodes of grade IIIa or greater rejection occurred in 11% (15/139) of heart transplant recipients. Twenty episodes of grade II to IV rejection occurred in 33% (15/46) of lung transplant recipients. After tacrolimus rescue therapy, 93% (14/15) of patients in the heart transplant group converted to grade II or less rejection. Refractory rejection was reversed in 73% (11/15) of the lung transplant group. Reversal was documented at biopsy in all (8/8) lung recipients in whom it had been histologically identified. FEV1 values of 3 additional patients stabilized.

Conclusions

The incidence of refractory rejection in thoracic organ transplant recipients on CBI is significant. Reversal of refractory rejection follows rescue immunotherapy with tacrolimus.

Section snippets

Patients and methods

During the period from December 1993 until October 1996, 208 patients underwent thoracic organ transplantation at the Hospital of the University of Wisconsin at Madison. There were 149 heart transplant recipients. Fifty-nine patients underwent lung transplantation. Most heart (139) and lung (46) transplant recipients underwent cyclosporine-based immunosuppression (cyclosporine A, steroids, azathioprine).

Immunosuppression was initiated at the time of transplantation. Methylprednisolone, 500 mg

Results

The overall incidence of refractory rejection in our thoracic organ transplant recipients maintained on cyclosporine-based immunosuppression was 16% (30/185). Eleven percent (15/139) of heart transplant recipients and 33% (15/46) of lung transplant recipients experienced refractory rejection. The primary diagnoses of patients who experienced refractory rejection were similar to those of the entire group of patients who underwent heart and lung transplantation during the same period (Figure 1).

Discussion

Although cyclosporine-based immunosuppression (CBI) has improved survival after thoracic organ transplantation,1, 2 some recipients continue to experience refractory acute cellular rejection. Refractory rejection has been described in 15% of heart transplant recipients.9 In addition, reports of recurrent acute rejection in lung transplant recipients are consistent with an incidence of refractory rejection of 13 to 36%.10, 11 In our series, 11% of heart transplant recipients and 33% of lung

Acknowledgements

We gratefully acknowledge the help of Dennis M. Heisey, PhD, with the statistical analysis.

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    Current address: Department of Surgery, University of Kentucky, Lexington, Kentucky.

    1

    Reprint requests: Robert B. Love, MD, Division of Cardiothoracic Surgery, Clinical Science Center, H4/358, 600 Highland Avenue, Madison, Wisconsin 53792.

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