Early diagnosis of candidemia in intensive care unit patients with sepsis: a prospective comparison of (1→3)-β-D-glucan assay, Candida score, and colonization index.
BACKGROUND
The culture-independent serum (1→3)-β-D-glucan (BG) detection test may allow early diagnosis of invasive fungal disease, but its clinical usefulness needs to be firmly established. A prospective single-center observational study was conducted to compare the diagnostic value of BG assay, Candida score (CS), and colonization index in intensive care unit (ICU) patients at risk for Candida sepsis.


METHODS
Of 377 patients, consecutively admitted to ICU for sepsis, 95 patients having an ICU stay of more than five days were studied. Blood specimens for fungal culture and BG measurement were obtained at the onset of clinical sepsis. For CS and colonization index calculations, surveillance cultures for Candida growth, and/or clinical data were recorded.


RESULTS
Sixteen (16.8%) patients were diagnosed with proven invasive fungal infection, 14 with candidiasis (13 candidemia and 1 mediastinitis) and 2 with pulmonary aspergillosis or fusariosis. Of 14 invasive Candida-infection patients, 13 had a serum sample positive for BG, 10 had a CS value ≥ 3, and 7 a colonization index ≥ 0.5. In the 12 candidemic patients, a positive BG result was obtained 24 to 72 hrs before a culture-documented diagnosis of invasive candidiasis. The positive and negative predictive values for the BG assay were higher than those of CS and colonization index (72.2% versus 57.1% and 27.3%; and 98.7% versus 97.2% and 91.7%, respectively).


CONCLUSIONS
A single-point BG assay based on a blood sample drawn at the sepsis onset, alone or in combination with CS, may guide the decision to start antifungal therapy early in patients at risk for Candida infection.
Institute of Microbiology, Università Cattolica del Sacro Cuore, Rome, Largo F. Vito 1, 00168, Italy.
Brunella
B
Posteraro
Gennaro
G
De Pascale
Mario
M
Tumbarello
Riccardo
R
Torelli
Mariano Alberto
MA
Pennisi
Giuseppe
G
Bello
Riccardo
R
Maviglia
Giovanni
G
Fadda
Maurizio
M
Sanguinetti
Massimo
M
Antonelli
D000293:Adolescent; D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D002175:Candida / Q000302:isolation & purification*; D058387:Candidemia / Q000175:diagnosis*; D015169:Colony Count, Microbial; D042241:Early Diagnosis; D005260:Female; D006801:Humans; D007362:Intensive Care Units; D008297:Male; D008875:Middle Aged; D011446:Prospective Studies; D018805:Sepsis / Q000097:blood*; D055815:Young Adult; D047071:beta-Glucans / Q000097:blood*
D047071:beta-Glucans