|Year : 2019 | Volume
| Issue : 1 | Page : 38-40
Rifampicin-Induced Thrombocytopenia: A Rare Complication
Ravi Dosi, Arun Chandelkar, Arpit Jain, Satish Motiwale, Prakash Joshi, Priyanshu Jain
Department of Respiratory Medicine, Sri Aurobindo Institute of Medical Sciences, Indore, Madhya Pradesh, India
|Date of Web Publication||18-Jan-2019|
Department of Respiratory Medicine, Sri Aurobindo Institute of Medical Sciences, Indore, Madhya Pradesh
Source of Support: None, Conflict of Interest: None
Extensive clinical experience has shown that rifampicin is well tolerated, but on rare occasions, it can cause life-threatening adverse reactions such as acute renal failure and thrombocytopenia. Throbocytopenia is mostly encountered with isoniazid and pyrazinamide. Rifampicin is an essential component of the treatment regimen for tuberculosis. We are reporting a case of rifampicin-induced thrombocytopenia which was being treated for pulmonary tuberculosis. The physician treating tuberculosis patients must be aware of this rare life-threatening complication.
Keywords: Rifampicin, thrombocytopenia, tuberculosis
|How to cite this article:|
Dosi R, Chandelkar A, Jain A, Motiwale S, Joshi P, Jain P. Rifampicin-Induced Thrombocytopenia: A Rare Complication. J Assoc Chest Physicians 2019;7:38-40
|How to cite this URL:|
Dosi R, Chandelkar A, Jain A, Motiwale S, Joshi P, Jain P. Rifampicin-Induced Thrombocytopenia: A Rare Complication. J Assoc Chest Physicians [serial online] 2019 [cited 2019 Dec 11];7:38-40. Available from: http://www.jacpjournal.org/text.asp?2019/7/1/38/250473
| Introduction|| |
Most antitubercular drugs are relatively safe, but serious reactions are also not uncommon. Thrombocytopenia is one of the uncommon but potentially fatal adverse effects seen with certain antitubercular drugs, including rifampicin. Rifampicin is a crucial drug in the treatment regimens for tuberculosis.
Adverse reaction to rifampicin is less on daily regimens but is relatively common with intermittent regimen. These include cutaneous syndrome, abdominal syndrome, flu-like syndrome, respiratory syndrome, and increased transaminases. Adverse reactions due to rifampicin are either dose related or allergic. Apart from its minor side effects like nausea, vomiting, and abdominal discomfort, very rarely it can cause life-threatening acute renal failure or thrombocytopenia.
To identify the offending agent in a patient taking several medications, it poses a challenging clinical problem., Confirmation of drug-induced thrombocytopenia at the time of initial presentation is not often possible as tests for drug-dependent antiplatelet antibodies are not available in most laboratories. Discontinuation of suspected drug leading to resolution of thrombocytopenia provides a strong evidence of drug-induced thrombocytopenia. Rifampicin-induced thrombocytopenia was first reported in 1970., It is usually reversible if detected early with high index of suspicion and treated appropriately.
| Case Report|| |
A 45-year-old male presented to our center with the complain of high-grade fever, cough with expectoration, loss of appetite from 1 month, and was found sputum positive. The patient had a history of taking anti tubercular therapy (ATT) for 1 month in November 2016 for sputum-positive pulmonary tuberculosis and was lost to follow-up; cartridge based nucleic acid amplification test (CBNAAT) was sent and Mycobacterium Tuberculosis (MTB) was detected with rifampicin sensitive. On examination, his vitals were stable, and post-tussive crepitations were present in left upper zone. So ATT was started under dots CAT II. His initial complete blood count (CBC) was within normal limit and platelet count was 3.51 Lacs. Renal and liver function test were within normal limits. He tolerated the treatment and was discharged on dots CAT II.
After 2 months of treatment, the patient presented with epistaxis, hemoptysis, and petechial eruption all over his trunk; his platelet count was found 3000/mm3, and rest investigation was within normal limit. The ATT was stopped, and transfuse with fresh frozen plasma and platelet-rich plasma, after 7 days patient platelet count, became normal and stabilize. His bleeding time and clotting time were 2 and 4.5 min, respectively. Rest all investigation was performed to rule out other causes of thrombocytopenia. Dengue profile and anti nuclear antibody (ANA) profile was negative. Bone marrow smear examination revealed megakaryocytic hyperplasia. Reticulocyte count was 0.3%. Peripheral smear showed normocytic normochromic red blood cell (RBC) and decreased platelet count. After ruling out other causes of thrombocytopenia, we planned to start an ATT with single-drug challenge at a time. The treatment was initiated with isoniazide and then pyrazinamide with a gap of 7 days added; lastly, rifampicin was added at dose of 450 mg/day, but this again resulted in thrombocytopenia (30,000/mm3) on the third day after starting rifampicin, and the drug was stopped; platelet count became normal (225,000/mm3) after 6 days without any supportive treatment; challenge with rifampicin was again given with low dose of 150 mg to the regimen and plan to gradually increase the dose once tolerated, but the platelet count decreased to 10,000/mm3 on lower dose only. The rifampicin was stopped, and during the follow-up, the platelet count became normal. Rifampicin was subtracted from regimen, and the patient was discharge on isoniazide, pyrazinamide, ethambutol, and streptomycin and had no further thrombocytopenia during remaining period of therapy. There were no clinical or laboratory abnormalities during follow-up examinations.
| Discussion|| |
Tuberculosis Research Centre, Chennai, reported only a single case of rifampicin-induced thrombocytopenia among over 8000 patients treated for tuberculosis over 30 years.,
Thrombocytopenia can occur with all primary antitubercular drugs. In case of isoniazid, it occurs as hematological reaction. There are reports of ethambutol and pyrazinamide-induced thrombocytopenia, perhaps by immunological mechanism.
The causes of thrombocytopenia include viral infections, immune disorders, collagen vascular diseases, lymphoproliferative disorders, and drugs. Other drugs known to cause thrombocytopenia are quinine, quinidine, chloroquine, sulfonamides, tolbutamide, chlorothiazide, digoxin, penicillamine, amphotericin B, sedatives, anticonvulsants, methyldopa, aspirin, etc. The drugs causing thrombocytopenia lead to either suppression of platelet production or immunological platelet destruction; most drugs induced thrombocytopenia by latter mechanism, and the platelets are damaged by complement activation following the formation of drug–antibody complex. The best proof of drug-induced etiology is the prompt rise in the platelet count when suspected drug is discontinued.
Serious adverse reactions due to rifampicin, which are immune complex mediated, are mostly encountered during intermittent therapy or when there is a gap in treatment., It has been postulated that with daily administration of rifampicin, there is neutralization of any antibody formed, and the immune complexes are continuously removed without causing any allergic reaction. Discontinuation of treatment allowed sufficient quantity of platelets to build up during drug-free interval, so that when rifampicin is readministered, an intense reaction ensues.
The mechanism hypothesized is that in the presence of the drug, the immune complexes nonspecifically adsorb to the platelet membrane, causing platelet damage and rapid removal from the circulation., The binding epitope of the Immunoglobulin G (IgG) antibody was found in the glycoprotein Ib/IX complex which is the target in rifampicin-induced immune thrombocytopenia.
Incidence of thrombocytopenia occurred from 1st to 14th month of therapy of rifampicin.
Although restarting ATT therapy in a patient suspected to have drug-induced thrombocytopenia, it is prudent to start with three drugs that are not given previously including one parentral agents (aminoglycoside or polypeptide) and two oral agents that are safe, when life-threatening adverse drug reaction has occurred. Cross-reactivity is not expected between different drugs or among stereo isomers due to high specificity of the reaction. Platelet counts should be monitored regularly, and platelets should be transfused to maintain levels above 20,000/mm3. Corticosteroids are of no benefit in drug-induced thrombocytopenia. However, in patients with severe thrombocytopenia, they may be administered as the diagnosis may be difficult to distinguish from other causes of thrombocytopenia due to similar clinical features. Offending drug should not be reused as only a minute quantity of drug is needed to set up subsequent immune reaction.
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Conflicts of interest
There are no conflicts of interest.
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