Acute interstitial nephritis during rifampicin therapy can be a paradoxical response: a case report
© der Meulen et al; licensee Cases Network Ltd. licensee BioMed Central Ltd. 2009
Received: 12 January 2009
Accepted: 17 February 2009
Published: 3 April 2009
An 18-year-old Ethiopian woman presented with debilitating back pain and high fever. X-ray examinations showed diffuse pulmonary tuberculosis and a psoas abscess. After starting rifampicin, isoniazid, ethambutol and pyrazinamide, acute interstitial nephritis developed that spontaneously recovered. According to Harrison's Online rifampicin should have been causative, but the spontaneous recovery excluded that possibility. The clinical course fit the diagnosis of a paradoxical response, for which recently risk factors have been described. Thus, a paradoxical response should be added to the list of causes of interstitial nephritis in tuberculosis patients and in such cases rifampicin could be continued.
Rifampicin, mostly in combination with isoniazid, ethambutol and pyrazinamide, is the first-line therapy for tuberculosis. Rifampicin's most feared side effect is hepatotoxicity. However, nephrotoxicity such as acute tubular necrosis and interstitial nephritis (IN) have also been reported. In case of acute tubular necrosis, rifampicin-dependent antibodies have been found, suggesting a causal relationship between rifampicin and renal failure . In acute IN only a temporal relationship is reported [2, 4]. In spite of the unproven causal relation, Harrison's online lists rifampicin as cause of IN . We present a patient with miliary tuberculosis, who developed IN during rifampicin, yet spontaneously recovered. Our observation and recent literature suggest that in case of hematogenously disseminated tuberculosis, a paradoxical response (PR) should be added to the list of possible causes of IN.
The introduction of effective anti-tuberculosis treatment has been accompanied with acute renal failure. In the early fifties of last century nephrotoxicity of streptomycin, one of the first aminoglycosides, was causative. When rifampicin became available, acute tubular necrosis was described. Almost all of the patients had rifampicin-dependent antibodies against the I-antigen which is present on erythrocytes and also on tubular epithelial cells. This I-antigen therefore could be the target through which the drug leads to acute tubular necrosis . In the nineteen-seventies, case histories of acute IN were published. Rifampicin was given for 21 to 71 days and renal biopsies showed interstitial infiltrates. The drug was stopped and renal function recovered. Due to this temporal relationship, an immune-mediated or direct nephrotoxicity of rifampicin was postulated -. However; such temporal relationship could also be compatible with a PR.
Paradoxical enlargement of intracranial tuberculomas during anti-tuberculosis treatment were reported in the early nineties of last century and called PR . Later, with the start of highly effective anti-retroviral therapy, PR became more common in HIV-positive patients with hematogenously disseminated tuberculosis during anti-tuberculosis treatment. Recently, even IN in such a patient has been reported. Two months after the start of the combination of anti-retroviral and anti-tuberculosis treatment, renal failure developed and renal biopsy revealed interstitial infiltrates. Assuming PR, rifabutin a rifamycin not negatively affecting the anti-retroviral therapy was continued and prednisone was added. Renal function improved within two weeks .
PR is defined as a transient worsening of pre-existing, often symptomless, lesions during anti-tuberculosis treatment. The etiology is unknown, although an interaction between the host's immune response and mycobacterial products has been suggested. PR occurs more frequently in HIV-positive patients. Risk factors for developing PR in HIV-negative patients are: anemia (Hb<6.8 mmol/l), low serum albumin (< 30 g/l) and a low lymphocyte count (< 0.8 × 109/l). Furthermore, during PR a significant rise of the lymphocyte count (>; 0.3 × 109/l) is seen . Anti-tuberculosis treatment during a PR should be continued. Our patient had hematogenously disseminated tuberculosis and abovementioned phenomena. Our hypothesis is that during the hematogenous spread mycobacteria are trapped within the kidney and cause IN i.e. PR during anti-tuberculosis treatment. The fact that the patient received quadruple therapy for nine weeks, could explain the absence of mycobacteria in the renal biopsy.
Transient IN during rifampicin treatment in HIV-negative tuberculosis patients has been described before, but not recognized as PR. One patient recovered after withdrawal of pyrazinamide while rifampicin was continued. The authors postulated pyrazinamide as the cause of the nephritis . Another patient developed IN while receiving triple therapy. Rifampicin and isoniazid were stopped without effect. When ethambutol was stopped as well, renal function improved. Then rifampicin and isoniazid were reintroduced without detrimental effect. Thus ethambutol was considered the culprit . Both patients however, had hematogenously disseminated tuberculosis and anemia. So PR seems a more likely explanation. Unfortunately, the case histories of rifampicin-associated IN contain insufficient data to draw conclusions about a possible PR.
HIV-negative tuberculosis patients with well-defined risk factors may develop IN during anti-tuberculosis therapy. This nephritis should be considered a PR, thus anti-tuberculosis drugs could be continued and corticosteroids eventually added.
Written informed consent was obtained from the patient for publication of this case report and accompanying images. A copy of the written consent is available for review by the Editor-in-Chief of this journal.
List of abbreviations
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