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Neurological toxicity of Tri-azole Antifungals DR CAROLINE BAXTER Clinical Research Fellow www.aspergillus.org.uk
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Tri-azole Antifungals VoriconazolePosaconazole Itraconazole
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ASPERGILLUS BRONCHITIS SAFS ABPA Type 1 and 3 hypersensitivity ASPERGILLOMACPA
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Tri-azole side effects Lestner et al, Clin Infect Dis, 2009 Sep 15;49(6):928-30 216 patients taking itraconazole 46% experienced adverse side effect Neurological: 21% sleep disturbance/poor memory and concentration, 11% peripheral neuropathy, 4% tremor. Seizures described but rare.
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Toxicity and drug levels Lestner et al, Clin Infect Dis, 2009 Sep 15;49(6):928-30
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Therapeutic Drug Level Monitoring
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Tremor 216 patients on itraconazole 5 cases reported – confirmed by accelerometry Onset 3wk-12 months 3 of 5 cases itraconazole level>15mg/l Dose reduction did not alter symptoms 1 case resolved off treatment and recurred with recommencement of the drug Also described with voriconazole and posaconazole. Unlikely class effect Lestner et al, J Neurol Neurosurg Psychiatry. 2010 Mar;81(3):327-9
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Peripheral Neuropathy Retrospective study Patients with aspergillosis commenced on tri-azoles between 2007-2010. 222 patients were commenced on tri-azole antifungals: 107 itraconazole, 75 voriconazole and 40 posaconazole. 24 patients described symptoms of PN, 1 excluded as diagnosed median nerve palsy. 3 patients described symptoms with both itraconazole and voriconazole. Total of 26 clinical episodes of PN. Baxter et al. J Antimicrob Chemother. 2011 Sep;66(9):2136-9
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Peripheral Neuropathy 22 presented as a sensory disturbance of the hands and/or feet developing over a median of 3 months. 4 presented with acute predominant lower limb weakness and difficulty walking over 1 to 4 weeks. 12 male, 11 female. Mean age 59. 26 episodes: 18 itraconazole, 7 voriconazole, 1 posaconazole
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Drug Levels 11 of the 26 had persistently elevated drug levels (despite dose reductions) in the 3 months prior to onset of symptoms. 10 of the 11 were high itraconazole levels and 1 elevated posaconazole level. All 7 patients experiencing symtoms with voriconazole had therapeutic drug levels.
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NCS 15 of the 26 episodes had formal nerve conduction studies performed. 12 of the 15 had confirmed PN: - 6 sensory predominant axonal neuropathy - 2 small fibre sensory neuropathy - 3 motor predominant axonal neuropathy - 1 mixed axonal/demyelinating neuropathy Of the 3 negative studies – no baseline, no small fibre studies, all spent >1 month off therapy prior to NCS
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Outcome 2 patients had persistent symptoms despite cessation of medication. 2 resolved with dose reduction All others resolved with stopping medication 3 patients had symptoms with both itraconazole and voriconazole 3 patients successfully changed to an alternative triazole
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Discussion Remarkably high rate of PN: itra 17%, vori 9%. No direct relationship to drug levels but some on itraconazole with high levels do respond to a reduction in dose. First ever described case of posaconazole PN. Most sensory predominant axonal neuropathy but must note 4 cases of rapid debilitating motor axonal neuropathy. Must screen for other causes of PN. Pathogenesis unknown – metronidazole (imidazole), mitochondrial disorders, accumulation in phospholipids in neurons.
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Discussion Risk, although low, of non recovery Early detection vital Neuropathy scales (chemotherapy, diabetes) Baseline NCS and small nerve studies
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Clinical Case HR Female 20 years old Cystic fibrosis F508/F508 Transferred to adult services (MACFU) in March 2007
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Clinical Case CF past history: Hearing loss due to iv aminoglycosides. Chronic transmissible strain Pseudomonas auerginosa. Intermittent Staphylococcus aureus. 1998 RLL lobectomy - aspergilloma (histology). Post surgery treatment with itraconazole 200mg bd.
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Clinical Case Clinically stable since surgery. Itraconazole 200mg bd continued. DRUG LEVEL MONITORING 01.11.02 Random 0.5mg/L 03.02.03 Random <0.4 no drug detected 25.03.03 Post-dose 2.1 03.07.03 Random 1.8 27.08.03 Post-dose 1.6 17.11.03 Post-dose 2.9 16.01.04 Random 2.3 14.06.04 Random 2.8
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Clinical Case Compliance Brand Time taken/food Other medication CF – GI absorption
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Clinical Case 2004 - Developed bilateral hand weakness and parasthesia. Seen by neurologist – peripheral neuropathy secondary to itraconazole. Itraconazole stopped. No recovery but no progression. Poor fine motor skills.
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Clinical Case After transfer to MACFU, HR remained well with no complications Annual november 2008 – FEV 1 1.8, FVC 2.15 (approx 65% predicted) Total IgE 880 KIU/l Specific IgE Aspergillus 15.2 KUa/l Eosinophils 0.13
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Clinical Case January 2009 Attended clinic feeling unwell Increasing shortness of breath and cough FEV 1 1.7, FVC 2.0 CXR – no acute changes Last sputum culture – Pseudomonas aeruginosa and Candida glabrata. Given 2 weeks oral ciprofloxacin and increased dose of azithromycin. Deterioration despite antibiotics (FEV1 1.0, CRP<5, culture negative) Admitted to hospital
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Clinical Case Improved in hospital with oral steroids and physiotherapy Rapid decline on discharge as steroids weaned Nov 08Jan 09Feb 09 Admit Feb 09 D/CMarch 09 IgE88030004800 IgE Asp15.26760.3 Eosinophils0.130.60.5 FEV 1 1.81.71.31.61.3 FVC2.152.01.82.32.1 RxAbxPred 40Pred 30Pred 20 ?
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Altered mental function Wide description of different symptoms associated with all tri-azoles. Common – 20% patients Sleep disturbance and nightmares Poor concentration Impaired memory - STM Depression
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Conclusions Side effects with tri-azoles are common and often limit their use. The three most common neurological side effects of tri-azoles are poor sleep/altered mental function, tremor and peripheral neuropathy. Drug level monitoring is important. First ensure drug levels are in therapeutic range. If symptoms not severe can first trial a dose reduction but maintain therapeutic levels. Risk balance of side effects and treatment benefit.
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Questions? www.aspergillus.org.uk
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