Fungal Infections in Peritoneal Dialysis
Candida species cause the vast majority of fungal peritonitis in PD patients, with Candida parapsilosis and Candida albicans being the most common pathogens, though non-albicans Candida species are increasingly prevalent. 1, 2, 3
Common Fungal Pathogens
Primary Causative Organisms
Candida species account for 80-90% of all fungal peritonitis cases in PD patients 1, 4, 5. The specific distribution includes:
- Candida parapsilosis - Most frequently isolated in recent studies (32-56% of cases) 1, 2, 3
- Candida albicans - Historically dominant but now accounts for approximately 37% of cases 2, 6
- Candida glabrata - Represents 13% of fungal peritonitis episodes 2
- Candida tropicalis - Accounts for approximately 17% of cases 3
- Other non-albicans Candida - Including C. krusei, C. guilliermondii, and C. rugosa 6, 3
Less Common Fungal Pathogens
Beyond Candida, several other fungi cause PD-associated peritonitis, though much less frequently:
- Aspergillus species - Represent approximately 20% of non-Candida fungal peritonitis 4, 6
- Rare pathogens - Including Fusarium, Saccharomyces, Acremonium, Rhodotorula mucilaginosa, and Hyphopichia burtonii 6, 7
Critical Risk Factors
Recent bacterial peritonitis and exposure to multiple antibiotics are the strongest predictors of fungal peritonitis. 1, 4, 2
High-Risk Clinical Scenarios
Patients at elevated risk include those with:
- Prior bacterial peritonitis - Present in 55-70% of fungal peritonitis cases 1, 4
- Recent antibiotic exposure - Particularly use of 2 or more antibiotic types within the preceding 3 months (independently associated with OR 1.940,95% CI 1.291-2.917) 1
- Polymicrobial or enterococcal bacterial peritonitis - These complicated bacterial infections frequently precede fungal episodes 1
- Prolonged PD duration - Median catheter time of 1133 days vs. 775 days for bacterial peritonitis 2
Clinical Presentation
Fungal peritonitis presents with less dramatic symptoms than bacterial peritonitis, making early recognition challenging. 2
Key Clinical Features
- Abdominal pain and cloudy effluent - Most common presenting symptoms 1
- Lower rates of fever and abdominal pain compared to bacterial peritonitis 2
- Indolent presentation - Often less acute than bacterial infections 8
Management Approach
Immediate catheter removal combined with systemic antifungal therapy is mandatory for fungal peritonitis. 9, 8
Essential Management Steps
Immediate catheter removal - Should occur within 24 hours of fungal identification, ideally on day 0 6. Studies show catheter removal timing improved from median 4 days (before 2005) to 0 days (after 2005), correlating with better outcomes 6
Systemic antifungal therapy - Continue for 10-14 days after catheter removal 8, 5
Antifungal Selection
For Candida albicans and azole-susceptible species:
- Fluconazole 400 mg daily - Most commonly used and appropriate first-line agent (used in 80% of cases) 9, 1, 4
- Treatment duration: 14 days after first negative blood culture 9
For azole-resistant species (C. glabrata, C. krusei):
- Echinocandins - Preferred agents 9, 8
- Caspofungin: 70 mg IV loading dose, then 50 mg daily
- Micafungin: 100 mg IV daily
- Anidulafungin: 200 mg IV loading dose, then 100 mg daily
- Lipid formulations of amphotericin B - Alternative at 3-5 mg/kg daily 9
Critical Pitfall to Avoid
Do not attempt catheter salvage or prolonged antifungal treatment without catheter removal. 8, 5 All six prospective studies evaluating catheter retention in fungal infections demonstrated worse outcomes with catheter retention 9. Antifungal lock therapy remains investigational and should not be relied upon 9.
Clinical Outcomes
Fungal peritonitis carries significantly worse prognosis than bacterial peritonitis across all metrics. 1, 2
Expected Outcomes
- Hospitalization rate: 95% vs. 39% for bacterial peritonitis 1
- Catheter removal rate: 79-90% vs. 9-22% for bacterial peritonitis 1, 2
- Permanent transfer to hemodialysis: 67-87% vs. 3-24% for bacterial peritonitis 1, 2
- Hospital length of stay: 26 days vs. 13 days for bacterial peritonitis 2
- Mortality rate: 20-27.5% 1, 4
- Technique failure: Up to 40% of survivors cannot resume PD 5
Species-Specific Outcomes
C. parapsilosis and C. guilliermondii generally show more favorable outcomes with appropriate management 3, while C. glabrata and emerging NAC species require treatment escalation and demonstrate poorer prognosis 3.
Prevention Considerations
In programs with high baseline fungal peritonitis rates, nystatin prophylaxis during antibiotic treatment for bacterial peritonitis may be beneficial. 5 However, each program must evaluate its own fungal peritonitis incidence to determine if prophylaxis is warranted, particularly for patients receiving multiple antibiotics for complicated bacterial peritonitis 1, 5.