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Published on: December 28, 2017
Genitourinary fungal infections: a therapeutic conundrum
1Division of Urology, Maimonides Medical Center, Brooklyn, New York 11219, USA. gwise@maimonidesmed.org
Abstract:
Fungi cause 8% of nosocomial infections. This is caused, in part, by the increasing pool of immunocompromised patients. Elderly, transplant and HIV patients, as well as premature infants, have become prime candidates for invasive fungal infections. The widespread use of broad spectrum antibiotics plays a role. Utilisation of appropriate antifungal treatment modalities requires an understanding of the pathogenesis of infection. This is a challenging problem as fungi can cause different clinical manifestations that depend on the type of fungal species and patient response to the infection. Although Candida spp. are the most frequent pathogen, other species such as Aspergillus and Cryptococcus have become major pathogens. Environmental fungi which include Blastomyces, Coccidioides and Histoplasma have become more aggressive in the vulnerable patient. The genitourinary system can be a source or target of disseminated fungal infection. Diagnosis depends on clinical awareness, utilisation of appropriate diagnostic modalities, imaging modalities and a thorough clinical assessment. The treatment of primary (Blastomyces, Coccidioides, Histoplasma) infection generally requires amphotericin B (AmpB). The opportunistic infections (Aspergillus, Cryptococcus and Candida) may respond to the triazoles although AmpB remains the 'gold standard'. Infections caused by Candida spp. represents the greatest challenge to the clinician. The presence of Candida spp. in the urine may indicate colonisation or infection. Untreated, Candida can remain as a 'saprophyte' or develop ascending infection, sepsis or death. The prophylactic use of fluconazole may in itself result in resistant infection, hence the 'conundrum'.
Insights
Fungal infections affect 8% of hospital patients, particularly the immunocompromised. Understanding fungal pathogenesis is crucial for effective antifungal treatment, especially for challenging Candida infections.
Area of Science:
- Medical Mycology
- Infectious Diseases
- Hospital Epidemiology
Background:
- Fungal infections account for 8% of nosocomial infections, with rising rates in immunocompromised populations (elderly, transplant, HIV, premature infants).
- Broad-spectrum antibiotic use contributes to the incidence of fungal infections.
- Diverse fungal pathogens (Candida, Aspergillus, Cryptococcus, Blastomyces, Coccidioides, Histoplasma) cause varied clinical manifestations.
Purpose of the Study:
- To review the pathogenesis, diagnosis, and treatment of fungal infections, emphasizing challenges in clinical management.
- To highlight the significance of Candida species as a major nosocomial pathogen.
- To discuss the complexities of antifungal treatment strategies and the emergence of resistance.
Main Methods:
- Literature review of fungal pathogenesis, clinical presentations, and treatment modalities.
- Analysis of diagnostic approaches including clinical assessment, imaging, and laboratory diagnostics.
- Evaluation of antifungal agents such as amphotericin B and triazoles.
Main Results:
- Invasive fungal infections pose a significant threat, especially to vulnerable patient groups.
- Accurate diagnosis requires a combination of clinical suspicion and appropriate diagnostic tools.
- Amphotericin B remains a primary treatment for endemic mycoses, while triazoles are options for opportunistic infections, though resistance is a concern.
Conclusions:
- Effective management of fungal infections necessitates a deep understanding of fungal biology and host factors.
- Candida species present a significant clinical challenge, with urinary presence indicating potential for serious complications.
- Antifungal stewardship is critical to prevent the development of resistant fungal strains.
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