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Diagnostic utility of 18 F-FDG PET/CT with very high SUV levels in patients with FUO end-stage renal disease and treated with renal replacement therapy.
Hellenic Journal of Nuclear Medicine 2019 March 6
OBJECTIVE: To evaluate the role of fluorine-18-fluorodeoxyglucose positron emission tomography/computed tomography (18 F-FDG PET/CT) in identifying the cause of fever of unknown origin (FUO) in patients on renal replacement therapy (RRT) for end-stage renal disease (ESRD).
SUBJECTS AND METHODS: We retrospectively reviewed the 18 F-FDG PET/CT scans of 46 patients with a mean age of 39.28±12.50 years on RRT for ESRD. All patients with abnormal scans had histopathologic examination and microbial cultures of tissue samples from areas with increased standardized uptake value maximum (SUVmax) suggesting the cause of FUO in the 18 F-FDG PET/CT scan. Fluorine-18-FDG PET/CT was considered helpful if it led to the diagnosis of the cause of FUO after histopathologic and microbiologic examinations.
RESULTS: Fluorine-18-FDG PET/CT was helpful in identifying the cause of FUO in 22/46 patients (47.83%). Infection was the cause of fever in all these 22 patients. C-reactive protein (CRP) (P=0.003) and procalcitonin levels (P=0.021) were higher in patients with helpful 18 F-FDG PET/CT. No significant difference was found in blood sugar levels and leucocytes counts between patients with helpful 18 F-FDG PET/CT outcome and those without. By multiple regression analysis, the odds of a helpful 18 F-FDG PET/CT increased with every unit increase in CRP level (OR: 1.009; 95% CI: 1.003-1.016; P=0.005).
CONCLUSION: About half of the 18 F-FDG-PET/CT scans (22/46) identified the cause of FUO in patients on RRT for ESRD. The clinical utility of 18 F-FDG PET/CT in this group of patients is comparable to its average performance in the unselected patients' population evaluated for FUO. A higher CRP level was predictive of a positive 18 F-FDG PET/CT outcome.
SUBJECTS AND METHODS: We retrospectively reviewed the 18 F-FDG PET/CT scans of 46 patients with a mean age of 39.28±12.50 years on RRT for ESRD. All patients with abnormal scans had histopathologic examination and microbial cultures of tissue samples from areas with increased standardized uptake value maximum (SUVmax) suggesting the cause of FUO in the 18 F-FDG PET/CT scan. Fluorine-18-FDG PET/CT was considered helpful if it led to the diagnosis of the cause of FUO after histopathologic and microbiologic examinations.
RESULTS: Fluorine-18-FDG PET/CT was helpful in identifying the cause of FUO in 22/46 patients (47.83%). Infection was the cause of fever in all these 22 patients. C-reactive protein (CRP) (P=0.003) and procalcitonin levels (P=0.021) were higher in patients with helpful 18 F-FDG PET/CT. No significant difference was found in blood sugar levels and leucocytes counts between patients with helpful 18 F-FDG PET/CT outcome and those without. By multiple regression analysis, the odds of a helpful 18 F-FDG PET/CT increased with every unit increase in CRP level (OR: 1.009; 95% CI: 1.003-1.016; P=0.005).
CONCLUSION: About half of the 18 F-FDG-PET/CT scans (22/46) identified the cause of FUO in patients on RRT for ESRD. The clinical utility of 18 F-FDG PET/CT in this group of patients is comparable to its average performance in the unselected patients' population evaluated for FUO. A higher CRP level was predictive of a positive 18 F-FDG PET/CT outcome.
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