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Published on: August 24, 2011
Hyperglycaemia as a possible marker of invasive fungal infection in preterm neonates
Paolo Manzoni1, Elio Castagnola, Michael Mostert
1Neonatology Unit and Hospital NICU, Ospedale S. Anna, Turin, Italy. paolomanzoni@hotmail.com
Aim:
The incidence of invasive fungal infection in preterm newborns is rising steadily. Early recognition and treatment are imperative, but diagnosis is difficult as data from microbiological investigations are often poor, and clinical and laboratory signs do not help in differentiating bacterial from fungal infections. We evaluated whether glucose intolerance could represent a possible surrogate marker predictor of invasive fungal infection in preterm neonates.
Methods:
We performed a case-control study on neonates with birthweight less than 1250 g admitted to our tertiary-level unit during the years 1998-2004 (n = 383), comparing those with invasive fungal infection (n = 45, group A) to matched controls with late-onset sepsis caused by bacterial agents (n = 46, group B). We investigated in both groups the occurrence of hyperglycaemia (serum glycaemia > 215 mg/dl, i.e. 12 mmol/l) in the first month of life, and its temporal relationship with the episodes of sepsis.
Results:
Hyperglycaemia occurred significantly more often in group A (21/45, 46.6%) than in group B neonates (11/46, 23.9%) (OR 1.95, 95% CI 1.235-4.432, p = 0.008). Moreover, in 19 of 21 (90.4%) neonates with hyperglycaemia in group A, the carbohydrate intolerance episode typically occurred 72 h prior to the onset of invasive fungal infection; in contrast, no temporal relationship was found in neonates with bacterial sepsis (p = 0.002). Correction of hyperglycaemia was successfully achieved in all neonates of both groups, with no significant differences in the number of days of insulin treatment needed to normalize glycaemia (p = 0.15).
Conclusions:
Hyperglycaemia is significantly more frequent in neonates who subsequently develop fungal rather than bacterial late-onset sepsis, with a typical 3-d interval. We suggest that a preterm neonate whose birthweight is less than 1250 g in its first month of life should be carefully evaluated for systemic fungal infection whenever signs of carbohydrate intolerance occur.
Insights
Hyperglycaemia, a sign of glucose intolerance, is more common in preterm newborns with invasive fungal infections. This finding suggests monitoring for fungal infections in vulnerable neonates presenting with carbohydrate intolerance.
Area of Science:
- Neonatal Medicine
- Infectious Diseases
- Metabolic Disorders
Background:
- Invasive fungal infections (IFIs) pose a growing threat to preterm newborns.
- Diagnosing IFIs is challenging due to non-specific clinical signs and poor microbiological data.
- Differentiating fungal from bacterial infections in neonates is difficult.
Purpose of the Study:
- To investigate if glucose intolerance, specifically hyperglycemia, can serve as a predictive marker for IFIs in preterm neonates.
- To evaluate the temporal relationship between hyperglycemia and the onset of IFIs.
Main Methods:
- A case-control study was conducted on 383 neonates (birthweight < 1250 g).
- Cases (n=45) had IFIs; controls (n=46) had bacterial late-onset sepsis.
- Hyperglycemia (serum glycaemia > 215 mg/dl) occurrence and timing relative to sepsis were analyzed.
Main Results:
- Hyperglycemia was significantly more frequent in neonates with IFIs (46.6%) compared to bacterial sepsis (23.9%).
- In 90.4% of IFI cases with hyperglycemia, it preceded infection by approximately 72 hours.
- No such temporal relationship was observed in bacterial sepsis cases.
Conclusions:
- Hyperglycemia is a significant indicator preceding invasive fungal infections in preterm neonates by about 3 days.
- Preterm neonates (<1250 g) with signs of carbohydrate intolerance warrant careful evaluation for systemic fungal infection.
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