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A wider array of antifungal agents has become available in the last 10 years (Table 3) (Table Not Available) . The availability of new agents or newer formulations of older agents have had a positive impact on the treatment of infections caused by Candida species.
The in vitro susceptibility of amphoteracin B in a clinical study by Powderly et al was better for blood isolates of yeasts in immunocompetent patients than immunocompromised patients (allogenic or autologous bone marrow transplantation and/or myelosuppressive chemotherapy). In that study, all episodes (10 of 10) of bloodstream infection in immunocompromised patients caused by isolates with minimum inhibitory concentrations (MICs) greater than 0.8 mug/mL were fatal, versus 8 of 17 episodes of bloodstream infection caused by yeast with MICs of 0.8 mug/mL or less ( p = 0.04).
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Many oncology units and infectious disease physicians now advocate the use of amphotericin B empirically in neutropenic patients on broad-spectrum antibiotics if they remain pyrexic after 4 to 7 days of antibiotic therapy. The use of amphotericin B, a polyene macrolide, is not without complications. Adverse problems include nephrotoxicity (which is usually reversible), electrolyte disturbance (decreased potassium, decreased magnesium), and pyrexia, sometimes with chills. Attention to hydration and close monitoring of renal function prior to and during amphotericin B therapy can reduce these adverse reactions. Use of antipyretics alone or in combination with antihistamines or meperidine can reduce or prevent the pyrexia response. The development of liposomal amphotericin B (a lipid formulation) has resulted in apparently equal efficacy with amphotericin B but without many of the associated complications, especially nephrotoxicity. Viagra super active erectile dysfunction treatment.
Amphotericin B is generally fungicidal against most strains of Candida species but less effective against those that are polyene deficient. Dosage adjustment for amphotericin B is not necessary in patients with extant renal failure (not caused by amphotericin B) or in patients with hepatic failure.
Hepatosplenic candidiasis is usually clinically resistant to amphotericin B and frequently requires a total dose of amphotericin B of several grams. Endocarditis caused by fungal agents requires surgical intervention with value resection. Removal of infected devices is advocated in fungal infections associated with central venous catheters, umbilical artery catheters, and dialysis catheters used in peritoneal dialysis.
Rifampin has no intrinsic antifungal property but augments the in vitro antifungal activity of amphotericin B against some Candida species including Candida albicans; however, this interaction is not apparent in in vivo studies.
Antagonism is observed in vitro between amphotericin B, which binds to ergosterol in the fungal cell membrane, and the antifungal imidazoles, which inhibit synthesis of ergosterol. There is, however, no consensus on the clinical significance of this issue. Cheap propecia 5 mg
The duration of amphotericin B therapy depends on the disease process being treated; in granulocytopenic patients it is continued until resolution of granulocytopenia. In patients with fungemia without another focus of infection, a total dose of 15 mg/kg (1 g) is usually adequate. In the nongranulocytic patient with fungemia, a total dose of 7 mg/kg (500 mg) is probably appropriate. Deep visceral infection is treated with a total dose of 22 mg/kg (approximately 1.5 g). Health news and articles