Value of (18)F-FDG-PET/CT in patients with fever of unknown origin and unexplained prolonged inflammatory syndrome: a single centre analysis experience

OBJECTIVE

The aim of our study was to evaluate the diagnostic contribution of (18)F-fluoro-deoxyglucose ((18)F-FDG)-positron emission tomography (PET)/computed tomography (CT) in patients with fever of unknown origin (FUO) or unexplained prolonged inflammatory syndrome (UPIS) in real life.

PATIENTS AND METHODS

We performed a retrospective study including 14 patients with FUO or UPIS hospitalised in our institution (Strasbourg University Hospital, France) between January 2005 and July 2006. (18)F-FDG-PET/CT was considered helpful when abnormal results allowed an accurate diagnosis.

RESULTS

(18)F-FDG-PET/CT was helpful in half the patients (7/14) for final diagnosis. A diagnosis was reached in 87.5% of the patients (7/8) with an abnormal (18)F-FDG-PET/CT but only in 50% of the patients (3/6) with a normal (18)F-FDG-PET/CT. Conventional chest and abdominal CT was performed in 13 patients before ordering (18)F-FDG-PET/CT. We considered that (18)F-FDG-PET/CT was essential to establish the final diagnosis in only 23% of the patients (3/13) since neither chest nor abdominal CT identified abnormalities consistent with the final diagnosis. However, among the three patients, two were diagnosed with large vessel vasculitis and one patient with local prosthetic infection.

CONCLUSIONS

Our study supports the potential interest of (18)F-FDG-PET/CT in the diagnostic workup of FUO and UPIS as it helped establish a fine diagnosis in half of the cases. However, (18)F-FDG-PET/CT appeared to be essential to the final diagnosis in only 23% of the cases. In our opinion, this protocol should be performed as a second level test, especially when conventional CT is normal or is unable to discriminate between active and silent lesions.

[Value of left atrial dilation in the diagnosis of silent myocardial ischemia in diabetes mellitus patients]

BACKGROUND

Accelerated atherothrombosis is a common feature in diabetes mellitus patients (DM), which can be related to abnormalities in vascular cell apoptosis and activation leading to the release of procoagulant microparticles (MPs). In DM patients, we hypothesized that circulating levels of biomarkers involved in atherothrombosis processes as well as cardiac and carotid echocardiography variables could be useful in the detection of silent myocardial diagnosed by myocardial perfusion imaging.

METHODS AND RESULTS

We investigated, in 55 patients with diabetes (mean age 62+/-10 years) and 15 nondiabetics (46+/-14 years) patients the prevalence of silent myocardial ischemia (SMI) detected by a treadmill exercise or dipyridamole (99m)Tc-sestamibi stress test. Echocardiographic and -carotid variables were obtained using standardized methods. Biomarkers assessing endothelial apoptosis or activation (CD31+-MPs, CD62+-MPs, VCAM-1), inflammatory status (CD11a +/- MPs, MCP-1, CRP), platelet activation (GPIb+/-MPs, CD40-L, P-selectin, GPV) ventricular stretch (BNP) were measured in the plasma. SMI was diagnosed in 23/55 (42%) diabetics patients and in 3/15 (20%) nondiabetics patients. Enhanced inflammatory status and leukocyte damage (CD11a+-MPs) were evidenced in diabetic patients. Within the diabetic population, biomarkers levels of atherothrombosis were not significantly associated to the detection of SMI. In multivariable analyses adjusted for LV hypertophy, left atrial surface (LA) remained independent predictor of silent myocardial ischemia (OR 4.14; IC [1.7-16.13]; P=0.039).

CONCLUSIONS

In diabetes mellitus patients, LA surface independently predicted silent myocardial ischemia after adjustment for established echocardiographic, and inflammatory risk factors. This simple measure of LA dilation could be helpful in the identification of diabetes mellitus patients at heightened cardiovascular risk.

Impact thérapeutique de l’imagerie TEP-FDG en carcinologie bronchopulmonaire

BACKGROUND

Because of the expected high performances of scintigraphic scans with [18F]-fluorodeoxyglucose (FDG) not only in diagnostics and but also in therapeutic impact, especially in thoracic oncology, there are a lot of French nuclear medicine departments which will soon be equipped with a positron emission tomograph (PET).

MATERIAL AND METHODS

The Nuclear Medicine Department of the Hôpital d'Instructions des Armées du Val-de-Grâce, Paris, led a retrospective study among physicians interested in 338 FDG-PET exams performed between may 2000 and march 2002 in order to compare its own results with international literature concerning four indications for lung cancer: pulmonary nodule or mass malignancy diagnostic, lung carcinoma extension evaluation, therapeutic efficiency, recurrence suspicion.

RESULTS

There seems to be no divergence, regarding limitation induced by the not exhaustive analysis of the retrospective study: more than every two FDG-PET exam highly influenced the effective therapy.

CONCLUSION

That is why clinical FDG-PET has to be widely developed to investigate lung cancer.

[Blood transfusion despite early use of erythropoietin: failure or limit of therapy? Annual cohort study of premature infants weighing less than 1500 g]

STUDY

Prospective, observative study.

SETTING

Neonatal intensive care unit in a university tertiary care hospital.

AIMS

1) Assessment of blood transfusion requirement. 2) Demonstration of haematocrit and hemoglobin level difference at birth between transfused and non-transfused infants. 3) Assessment of iron mass before and after early iron supplementation.

POPULATION

All premature infants without cardiopathy, surgical diseases, hemolysis or haemorrhage, at less than 30 weeks of gestational age or less than 32 weeks, weighing less than 1,500 grams, with respiratory distress syndrome admitted into the unit during the year 1998, were included in the study. Each received erythropoietin (750 U.kg-1.wk-1) with intravenous iron supplements from day 5 (0.017 mmol.kg-1.d-1), then orally (0.17 mmol.kg-1.d-1).

RESULTS

Seventy-nine premature infants were included in this study. 1) Sixty-seven percent of the transfusions occurred during the first 14 days of life. 2) Haematocrit and hemoglobin levels at birth were significantly different between transfused and non-transfused infants (P < 0.001) and remained different for infants of less than 28 weeks (P < 0.01). 3) After six weeks of iron supplementation (mean 0.31 mmol/kg), the ferritin level had significantly decreased in the non-transfused (P < 0.001) and transfused population (P < 0.01).

CONCLUSION

Increasing the haematocrit and the hemoglobin levels at birth, for example by placentofetal transfusion, could decrease the number of early transfusion. Early intravenous iron supplementation had no side effects but did not maintain iron levels.

Bone pain palliation with 85Sr therapy

The aim of this retrospective study was to evaluate the efficacy of 85Sr in the palliation of metastatic bone pain. 85Sr decays by electron capture with a gamma emission of 514 keV and associated x-ray emissions of 10-15 keV; physical half-life is 64 d.

METHODS

Between 1977 and 1992, 119 doses of 85Sr chloride (mean activity 335 MBq [9 mCi]) were intravenously administered to 108 patients with hyperalgic generalized bone metastases from prostatic carcinoma (52 patients), breast carcinoma (41) or other cancers (15). Pain, performance status, blood and urinary excretion values were investigated during follow-up, and survival time was recorded. Strontium bone scans were obtained up to 8 wk after injection to document isotope biodistribution and to estimate absorbed doses.

RESULTS

At 12 wk, 72.2% of patients showed significant benefit from treatment, i.e., enhanced quality of life and pain relief; 49.1% became free of pain. These beneficial effects lasted from 1 to 36 mo (mean 4.3 mo). The best symptomatic improvement was seen in patients treated at an early stage of metastatic skeletal disease and in prostate cancer patients. No evidence of a significant dose-response relationship was found in the data analysis. The mean absorbed dose ratio of metastases to marrow was estimated at 8.2. We found no evidence that hematological toxicity was a major problem; however, all patients experienced a reduction in blood counts, especially in platelets.

CONCLUSION

Systemic radionuclide therapy using 85Sr is a feasible, effective and well-tolerated palliative treatment in patients with refractory bone pain. We attained at least the same response rate as that reported with bone-seeking beta-emitting radionuclides such as 89Sr. The patients who benefited the most from 85Sr treatment were in an early stage of metastatic disease or had prostate cancer. Our clinical findings could not be linked to either the total injected activity of 85Sr or the estimated absorbed dose delivered to metastases.