Kidney, Liver, and Heart Transplant
Cyclosporine capsules, (NON-MODIFIED), when used in high dosages, can cause hepatotoxicity and nephrotoxicity (see BOXED WARNING).
Nephrotoxicity
It is not unusual for serum creatinine and Blood Urea Nitrogen (BUN) levels to be elevated during cyclosporine therapy. These elevations in renal transplant patients do not necessarily indicate rejection, and each patient must be fully evaluated before dosage adjustment is initiated.
Nephrotoxicity has been noted in 25% of cases of renal transplantation, 38% of cases of cardiac transplantation, and 37% of cases of liver transplantation. Mild nephrotoxicity was generally noted 2 to 3 months after transplant and consisted of an arrest in the fall of the preoperative elevations of BUN and creatinine at a range of 35 to 45 mg/dl and 2 to 2.5 mg/dl, respectively. These elevations were often responsive to dosage reduction.
More overt nephrotoxicity was seen early after transplantation and was characterized by a rapidly rising BUN and creatinine. Since these events are similar to rejection episodes, care must be taken to differentiate between them. This form of nephrotoxicity is usually responsive to cyclosporine capsules dosage reduction.
Although specific diagnostic criteria which reliably differentiate renal graft rejection from drug toxicity have not been found, a number of parameters have been significantly associated to one or the other. It should be noted however, that up to 20% of patients may have simultaneous nephrotoxicity and rejection.
| |
| Nephrotoxicity vs. Rejection |
| Parameter | Nephrotoxicity | Rejection |
| History | Donor > 50 years old or hypotensive | Antidonor immune response |
| Prolonged kidney preservation | Retransplant patient |
| Prolonged anastomosis time | |
| Concomitant nephrotoxic drugs | |
| Clinical | Often > 6 weeks postopb
| Often < 4 weeks postopb
|
| Prolonged initial nonfunction | Fever > 37.5°C |
| (acute tubular necrosis) | Weight gain > 0.5 kg |
| | Graft swelling and tenderness |
| | Decrease in daily urine volume > 500 mL |
| | (or 50%) |
| Laboratory | CyA serum trough level > 200 ng/mL | CyA serum trough level < 150 ng/mL |
| Gradual rise in Cr (< 0.15 mg/dL/day)a
| Rapid rise in Cr (> 0.3 mg/dL/day)a
|
| Cr plateau < 25% above baseline | Cr > 25% above baseline |
| BUN/Cr ≥ 20 | BUN/Cr < 20 |
| Biopsy | Arteriolopathy (medial hypertrophya, | Endovasculitisc (proliferationa, |
| hyalinosis, nodular deposits, intimal | intimal arteritisb, necrosis, sclerosis) |
| thickening, endothelial vacuolization, | |
| progressive scarring) | |
| Tubular atrophy, isometric vacuolization, | Tubulitis with RBCb and WBCb casts, |
| isolated calcifications | some irregular vacuolization |
| Minimal edema | Interstitial edemac and hemorrhageb
|
| Mild focal infiltratesc
| Diffuse moderate to severe mononuclear |
| | infiltratesd
|
| Diffuse interstitial fibrosis, | Glomerulitis (mononuclear cells)c
|
| often striped form | |
| Aspiration Cytology | CyA deposits in tubular and | Inflammatory infiltrate with mononuclear phagocytes, |
| endothelial cells | macrophages, lymphoblastoid cells, and |
| | activated T-cells |
| Fine isometric vacuolization of | |
| tubular cells | |
| | These strongly express HLA-DR antigens |
| Urine Cytology | Tubular cells with vacuolization and | Degenerative tubular cells, plasma cells, and |
| granularization | lymphocyturia > 20% of sediment |
| Manometry | Intracapsular pressure < 40 mm Hgb
| Intracapsular pressure > 40 mm Hgb
|
| Ultrasonography | Unchanged graft cross-sectional area | Increase in graft cross-sectional area |
| | AP diameter ≥ Transverse diameter |
| Magnetic Resonance | Normal appearance | Loss of distinct corticomedullary junction, swelling, |
| Imagery | | image intensity of parachyma approaching that |
| | of psoas, loss of hilar fat |
| Radionuclide Scan | Normal or generally decreased perfusion | Patchy arterial flow |
| Decrease in tubular function | Decrease in perfusion > decrease in tubular function |
| (131 I-hippuran) > decrease in perfusion | Increased uptake of Indium 111 labeled platelets or |
| (99m Tc DTPA) | Tc-99m in colloid |
| Therapy | Responds to decreased | Responds to increased steroids or |
| cyclosporine capsules | antilymphocyte globulin |
ap < 0.05, bp < 0.01, cp < 0.001, dp < 0.0001
A form of chronic progressive cyclosporine-associated nephrotoxicity is characterized by serial deterioration in renal function and morphologic changes in the kidneys. From 5% to 15% of transplant recipients will fail to show a reduction in a rising serum creatinine despite a decrease or discontinuation of cyclosporine therapy. Renal biopsies from these patients will demonstrate an interstitial fibrosis with tubular atrophy. In addition, toxic tubulopathy, peritubular capillary congestion, arteriolopathy, and a striped form of interstitial fibrosis with tubular atrophy may be present. Though none of these morphologic changes are entirely specific, a histologic diagnosis of chronic progressive cyclosporine-associated nephrotoxicity requires evidence of these.
When considering the development of chronic nephrotoxicity, it is noteworthy that several authors have reported an association between the appearance of interstitial fibrosis and higher cumulative dosage or persistently high circulating trough concentrations of cyclosporine. This is particularly true during the first 6 posttransplant months when the dosage tends to be highest and when, in kidney recipients, the organ appears to be most vulnerable to the toxic effects of cyclosporine. Among other contributing factors to the development of interstitial fibrosis in these patients must be included, prolonged perfusion time, warm ischemia time, as well as episodes of acute toxicity, and acute and chronic rejection. The reversibility of interstitial fibrosis and its correlation to renal function have not yet been determined.
Impaired renal function at any time requires close monitoring, and frequent dosage adjustment may be indicated. In patients with persistent high elevations of BUN and creatinine who are unresponsive to dosage adjustments, consideration should be given to switching to other immunosuppressive therapy. In the event of severe and unremitting rejection, it is preferable to allow the kidney transplant to be rejected and removed rather than increase the cyclosporine capsules dosage to a very high level in an attempt to reverse the rejection.
Due to the potential for additive or synergistic impairment of renal function, caution should be exercised with concomitant administration of cyclosporine capsules with other drugs that may impair renal function (see PRECAUTIONS, Drug Interactions ).
Thrombotic Microangiopathy
Occasionally patients have developed a syndrome of thrombocytopenia and microangiopathic hemolytic anemia which may result in graft failure. The vasculopathy can occur in the absence of rejection and is accompanied by avid platelet consumption within the graft as demonstrated by Indium 111 labeled platelet studies. Neither the pathogenesis nor the management of this syndrome is clear. Though resolution has occurred after reduction or discontinuation of cyclosporine capsules and 1) administration of streptokinase and heparin or 2) plasmapheresis, this appears to depend upon early detection with Indium 111 labeled platelet scans (see ADVERSE REACTIONS ).
Hyperkalemia
Significant hyperkalemia (sometimes associated with hyperchloremic metabolic acidosis) and hyperuricemia have been seen occasionally in individual patients.
Hepatotoxicity
Cases of hepatotoxicity and liver injury, including cholestasis, jaundice, hepatitis, and liver failure have been reported in patients treated with cyclosporine. Most reports included patients with significant co-morbidities, underlying conditions and other confounding factors, including infectious complications and comedications with hepatotoxic potential. In some cases, mainly in transplant patients, fatal outcomes have been reported (see ADVERSE REACTIONS, Postmarketing Experience ).
Hepatotoxicity, usually manifested by elevations in hepatic enzymes and bilirubin, was reported in patients treated with cyclosporine in clinical trials: 4% in renal transplantation, 7% in cardiac transplantation, and 4% in liver transplantation. This was usually noted during the first month of therapy when high dosage of cyclosporine capsules were used. The chemistry elevations usually decreased with a reduction in dosage.
Malignancies
As in patients receiving other immunosuppressants, those patients receiving cyclosporine capsules are at increased risk for development of lymphomas and other malignancies, particularly those of the skin. The increased risk appears related to the intensity and duration of immunosuppression rather than to the use of specific agents. Because of the danger of oversuppression of the immune system, which can also increase susceptibility to infection, cyclosporine capsules should not be administered with other immunosuppressive agents except adrenal corticosteroids. The efficacy and safety of cyclosporine in combination with other immunosuppressive agents have not been determined. Some malignancies may be fatal. Transplant patients receiving cyclosporine are at increased risk for serious infection with fatal outcome.
Serious Infections
SPL UNCLASSIFIED SECTION
Patients receiving immunosuppressants, including cyclosporine capsules, are at increased risk of developing bacterial, viral, fungal, and protozoal infections, including opportunistic infections. These infections may lead to serious, including fatal, outcomes (
see BOXED WARNING and ADVERSE REACTIONS
).
Polyoma Virus Infections
Patients receiving immunosuppressants, including cyclosporine capsules, are at increased risk for opportunistic infections, including polyoma virus infections. Polyoma virus infections in transplant patients may have serious, and sometimes, fatal outcomes. These include cases of JC virus-associated progressive multifocal leukoencephalopathy (PML), and polyoma virus-associated nephropathy (PVAN), especially due to BK virus infection, which have been observed in patients receiving cyclosporine.
PVAN is associated with serious outcomes, including deteriorating renal function and renal graft loss, (see ADVERSE REACTIONS
, Postmarketing Experience ). Patient monitoring may help detect patients at risk for PVAN.
Cases of PML have been reported in patients treated with cyclosporine capsules. PML, which is sometimes fatal, commonly presents with hemiparesis, apathy, confusion, cognitive deficiencies, and ataxia. Risk factors for PML include treatment with immunosuppressant therapies and impairment of immune function. In immunosuppressed patients, physicians should consider PML in the differential diagnosis in patients reporting neurological symptoms and consultation with a neurologist should be considered as clinically indicated.
Consideration should be given to reducing the total immunosuppression in transplant patients who develop PML or PVAN. However, reduced immunosuppression may place the graft at risk.
Neurotoxicity
There have been reports of convulsions in adult and pediatric patients receiving cyclosporine, particularly in combination with high-dosage methylprednisolone.
Encephalopathy, including Posterior Reversible Encephalopathy Syndrome (PRES), has been described both in postmarketing reports and in the literature. Manifestations include impaired consciousness, convulsions, visual disturbances (including blindness), loss of motor function, movement disorders, and psychiatric disturbances. In many cases, changes in the white matter have been detected using imaging techniques and pathologic specimens. Predisposing factors such as hypertension, hypomagnesemia, hypocholesterolemia, high-dosage corticosteroids, high cyclosporine blood concentrations, and graft-versus-host disease have been noted in many but not all of the reported cases. The changes in most cases have been reversible upon discontinuation of cyclosporine, and in some cases, improvement was noted after reduction of dosage. It appears that patients receiving liver transplant are more susceptible to encephalopathy than those receiving kidney transplant. Another rare manifestation of cyclosporine-induced neurotoxicity is optic disc edema, including papilloedema, with possible visual impairment, secondary to benign intracranial hypertension.
Alcohol (ethanol)
The alcohol content (see DESCRIPTION ) of cyclosporine capsules should be considered when given to patients in whom alcohol intake should be avoided or minimized, e.g., pregnant or breastfeeding women, in patients presenting with liver disease or epilepsy, in alcoholic patients, or pediatric patients. For an adult weighing 70 kg, the maximum daily oral dosage would deliver about 1 gram of alcohol (see DESCRIPTION for alcohol content of each formulation).
Care should be taken in using cyclosporine capsules with nephrotoxic drugs (see PRECAUTIONS ).
Risks with Inappropriate Switching Between Neoral Capsules (MODIFIED) and Cyclosporine Capsules, (NON-MODIFIED)
Do not switch between cyclosporine capsules, (NON-MODIFIED) to Neoral capsules, MODIFIED on a mg-to-mg basis to achieve the same total daily cyclosporine dosage.
Cyclosporine capsules, (NON-MODIFIED) 25 mg and 100 mg and Neoral (cyclosporine capsules), MODIFIED 25 mg and 100 mg are not mutually substitutable on a mg-to-mg basis due to differences in pharmacokinetic profiles.
- Inappropriate switching from cyclosporine capsules, (NON-MODIFIED) to Neoral capsules MODIFIED, increases cyclosporine exposure which may increase the risk of cyclosporine-associated adverse reactions.
- Inappropriate switching from Neoral capsules, MODIFIED, to cyclosporine capsules, (NON-MODIFIED) decreases cyclosporine exposure which may decrease the efficacy of cyclosporine for the prophylaxis of organ rejection in kidney, liver, and heart allogeneic transplants or treatment of chronic rejection in patients previously treated with other immunosuppressive agents.
For recommendations on how to switch between cyclosporine capsules, and Neoral capsules, including increasing the frequency of blood cyclosporine concentration monitoring, see DOSAGE AND ADMINISTRATION