eMedicine Specialties > Infectious Diseases > HEENT Infections
Rhinocerebral Mucormycosis: Treatment & Medication
Updated: Feb 11, 2009
- Overview
- Differential Diagnoses & Workup
- Treatment & Medication
- Follow-up
- Multimedia
Treatment
Medical Care
Rhinocerebral mucormycosis (RCM) is treated by (1) reversing underlying immunocompromised states, (2) administering systemic antifungals, and (3) performing urgent surgical debridement. No studies address the appropriate dose or formulation of antifungal therapy; therefore, a wide range of doses and formulations are used until the underlying cause of the immune suppression is under control. Antifungal therapy alone or surgical therapy alone is ineffective.
- Aggressively control hyperglycemia and acidosis.
- Discontinue or maximally reduce chemotherapy and immunosuppressive therapy.
- Promptly initiate antifungal therapy. Amphotericin B is the only reliable systemic antifungal agent approved for the treatment of mucormycosis.
- Garner and Machin (2008) reported on the use of prophylactic posaconazole (second-generation azole antifungal) during an outbreak of mucormycosis. None of 15 children considered to be at high risk who received the drug developed mucormycosis.18
- Several studies have reported salvage therapy with posaconazole in patients with zygomycosis refractory or intolerant to other treatments. Whether posaconazole is superior to amphotericin B is still being studied.
- Granulocyte colony-stimulating factor (GCSF) can be administered to reconstitute host defenses and to enhance leukocytosis.19
- If disease is limited to the sinus and orbit (ie, sino-orbital), debridement and systemic antifungals combined with local amphotericin irrigation may control the process.
- Hyperbaric oxygen (HBO) therapy has been used in an attempt to control the infection. Experts suggest that HBO may have fungistatic activity by reducing tissue hypoxia and acidosis. No studies address its efficacy.
- Dexamethasone has been used to treat brain edema.
Surgical Care
The mainstay of therapy is extensive debridement of all infected and necrotic tissue with drainage of all sinus and abscess fluid collections.
- Immediately obtain consultation with a surgeon. Conservative attempts to spare tissue may result in retention of the organism and subsequent treatment failure.
- Intraoperative frozen sections help to determine involved tissues and margins.
- Treatment may require orbital debridement and exenteration.
- A delay in surgery may decrease the likelihood of survival in all forms of invasive mucormycosis.
- Wide excision should ideally occur before CNS invasion.
- The role of endoscopic sinus surgery is unclear, although it may provide an initial diagnostic role.20
Consultations
- Infectious diseases specialist
- Neurosurgeon
- Ophthalmologist
- Otolaryngologist
Medication
Although the currently approved azoles are active against the phaeohyphomycoses that cause fungal sinusitis, they have no activity against Mucor molds. Amphotericin B is fungistatic for Mucor molds but is the only reliable systemic antifungal agent. Amphotericin is a highly toxic agent that is administered intravenously in its conventional form or in 1 of 3 new lipid-complex formulations. Amphotericin has also been administered via intracavitary (ie, via catheter into the space), interstitial, and intrathecal routes.21 Reports document the use of nebulized amphotericin B for sinonasal disease. Large doses are required for cure.
Only conventional amphotericin B is approved by the US Food and Drug Administration (FDA) as initial therapy for rhinocerebral mucormycosis (RCM); thus, it is considered the standard therapy for invasive mucormycosis. Lipid formulations are approved if the creatinine level rises to greater than 2.5 mg/dL, if adverse events are severe and persistent, or if disease progresses despite a total dose greater than 500 mg. Experience with the lipid formulations is growing, but no head-to-head studies have been performed. Many experts initiate therapy with a lipid-complex formulation in patients with pre-existing renal impairment. Some experts argue that lipid-formulation amphotericin offers better penetration across the blood-brain barrier and into the sinus.
Use amphotericin at the maximum dose tolerated for this life-threatening infection. Experimental antifungal agents have demonstrated in vitro activity against the Mucor molds and may offer additional treatment options in the future.
The evidence for iron chelators (ie, deferoxamine) as a potential therapeutic intervention has been increasing in animal studies. While deferoxamine is an iron chelator from the perspective of the human host, it actually serves as a siderophore, delivering free iron to Mucor. Animal studies have shown that administration of iron chelators to mice with Rhizopus infection markedly improved survival and may be just as effective as liposomal amphotericin B.
Antifungal agents
Their mechanism of action may involve inhibition of fungal cell membrane formation and impairing the integrity of fungal cell membrane.
Amphotericin B (Fungizone)
Polyene antibiotic with poor oral availability. Produced by a strain of Streptomyces nodosus; can be fungistatic or fungicidal. Binds to sterols (eg, ergosterol) in the fungal cell membrane, causing leakage of intracellular components and fungal cell death. Toxicity to human cells may occur via this same mechanism.
Adult
0.25-1 mg IV test dose infused over 30-60 min; observe for severe fever, chills, hypotension
1-1.5 mg/kg/d IV infusion over 4-6 h
Pediatric
0.5-1 mg/kg/d IV recommended test dose infusion over 4-6 h
Alternatively: 0.25 mg/kg IV on day 1, 0.5 mg/kg IV on day 2, then 1 mg/kg/d IV
Antineoplastic agents may enhance the potential of amphotericin B for renal toxicity, bronchospasm, and hypotension; corticosteroids, digitalis, and thiazides may potentiate hypokalemia; the risk of renal toxicity is increased with cyclosporine
Documented hypersensitivity
Pregnancy
B - Fetal risk not confirmed in studies in humans but has been shown in some studies in animals
Precautions
Monitor renal function, serum electrolytes (eg, magnesium, potassium), liver function, CBC, and hemoglobin concentrations; resume therapy at the lowest level (eg, 0.25 mg/kg) when therapy is interrupted for more than 7 d; hypoxemia, acute dyspnea, and interstitial infiltrates may occur in neutropenic patients receiving leukocyte transfusions (separate time of amphotericin infusion from time of leukocyte transfusion)
Amphotericin B lipid complex (ABLC, Abelcet)
Amphotericin B in phospholipid complexed form. Polyene antibiotic with poor oral availability. Produced by a strain of Streptomyces nodosus; can be fungistatic or fungicidal. Binds to sterols (eg, ergosterol) in the fungal cell membrane, causing leakage of intracellular components and fungal cell death. Toxicity to human cells may occur via this same mechanism.
Adult
5 mg/kg/d IV infusion over 2 h
Pediatric
Administer as in adults
Antineoplastic agents may enhance the potential of amphotericin B for renal toxicity, bronchospasm, and hypotension; corticosteroids, digitalis, and thiazides may potentiate hypokalemia; the risk of renal toxicity is increased with cyclosporine
Documented hypersensitivity
Pregnancy
B - Fetal risk not confirmed in studies in humans but has been shown in some studies in animals
Precautions
Acute infusional toxicities per conventional amphotericin B occur at a somewhat lower rate; nephrotoxicity is less frequent and less severe, but can still occur; monitoring of electrolytes, BUN, and creatinine is still required, and potassium and magnesium should be replaced as needed
Amphotericin B (AmBisome)
A lipid preparation consisting of amphotericin B within unilamellar liposomes. Delivers higher concentrations of the drug, with a theoretical increase in therapeutic potential and decreased nephrotoxicity.
Polyene antibiotic with poor oral availability. Produced by a strain of Streptomyces nodosus; can be fungistatic or fungicidal. Binds to sterols (eg, ergosterol) in the fungal cell membrane, causing leakage of intracellular components and fungal cell death. Toxicity to human cells may occur via this same mechanism.
Adult
5-7.5 mg/kg/d IV infused over 2 h
Pediatric
5 mg/kg/d IV infused over 2 h
Antineoplastic agents may enhance the potential of amphotericin B for renal toxicity, bronchospasm, and hypotension; corticosteroids, digitalis, and thiazides may potentiate hypokalemia; the risk of renal toxicity is increased with cyclosporine
Documented hypersensitivity
Pregnancy
B - Fetal risk not confirmed in studies in humans but has been shown in some studies in animals
Precautions
Acute infusional toxicities per conventional amphotericin B occur at a somewhat lower rate; nephrotoxicity is less frequent and less severe, but can still occur; monitoring of electrolytes, BUN, and creatinine is still required, and potassium and magnesium should be replaced as needed
Amphotericin B colloidal dispersion (Amphocil, ABCD)
A lipid preparation consisting of amphotericin B attached to lipid discoid structures.
Polyene antibiotic with poor oral availability. Produced by a strain of Streptomyces nodosus; can be fungistatic or fungicidal. Binds to sterols (eg, ergosterol) in the fungal cell membrane, causing leakage of intracellular components and fungal cell death. Toxicity to human cells may occur via this same mechanism.
Adult
2-7.5 mg/kg/d IV infused over 2 h
Pediatric
Administer as in adults
Antineoplastic agents may enhance the potential of amphotericin B for renal toxicity, bronchospasm, and hypotension; corticosteroids, digitalis, and thiazides may potentiate hypokalemia; the risk of renal toxicity is increased with cyclosporine
Documented hypersensitivity
Pregnancy
B - Fetal risk not confirmed in studies in humans but has been shown in some studies in animals
Precautions
Acute infusional toxicities per conventional amphotericin B occur at a somewhat lower rate; nephrotoxicity is less frequent and less severe, but can still occur; monitoring of electrolytes, BUN, and creatinine is still required, and potassium and magnesium should be replaced as needed
Fluconazole (Diflucan)
Bis-triazole antifungal agent. Fluconazole binds to the fungal p450 enzymes and stops the cells that make ergosterol, the main component of the cell wall.
Adult
Individualize; 200 mg PO on day 1, then 100 mg/d PO for at least 2 wk
Pediatric
Individualize; 6 mg/kg on day 1, then 3 mg/kg/d for at least 3 wk; treat for at least 2 wk after symptoms resolve; max 12 mg/kg/d
Fluconazole may increase the concentration and enhance the effects of warfarin, antidiabetic sulfonylurea medication (tolbutamide, glibenclamide, gliclazide, glipizide), phenytoin, theophylline, ciclosporin, and celecoxib
Documented hypersensitivity
Pregnancy
C - Fetal risk revealed in studies in animals but not established or not studied in humans; may use if benefits outweigh risk to fetus
Precautions
Side effects include vomiting, diarrhea, abdominal pain, and skin rashes; may cause hepatoxicity
More on Rhinocerebral Mucormycosis |
| Overview: Rhinocerebral Mucormycosis |
| Differential Diagnoses & Workup: Rhinocerebral Mucormycosis |
Treatment & Medication: Rhinocerebral Mucormycosis |
| Follow-up: Rhinocerebral Mucormycosis |
| Multimedia: Rhinocerebral Mucormycosis |
| References |
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Further Reading
Keywords
rhinocerebral mucormycosis, RCM, phycomycosis, zygomycosis, rhinoorbital mucormycosis, rhino-orbital mucormycosis, Mucorales, Rhizopus, Absidia, Mucor, Rhizomucor, Saksenaea, Apophysomyces
Treatment & Medication: Rhinocerebral Mucormycosis