Objective: To compare results of positron emission tomography (PET) with carbon-11-labeled Pittsburgh compound B (11C-PIB) obtained with cerebellar or global brain uptake for voxel intensity normalization, describe the cortical sites with highest tracer uptake in subjects with mild Alzheimer’s disease (AD), and explore possible group differences in 11C-PIB binding to white matter. Methods: 11C-PIB PET scans were acquired from subjects with AD (n=17) and healthy elderly controls (n=19). Voxel-based analysis was performed with statistical parametric mapping (SPM). Results: Cerebellar normalization showed higher 11C-PIB uptake in the AD group relative to controls throughout the cerebral cortex, involving the lateral temporal, orbitofrontal, and superior parietal cortices. With global uptake normalization, greatest cortical binding was detected in the orbitofrontal cortex; decreased 11C-PIB uptake in white matter was found in the posterior hippocampal region, corpus callosum, pons, and internal capsule. Conclusion: The present case-control voxelwise 11C-PIB PET comparison highlighted the regional distribution of amyloid deposition in the cerebral cortex of mildly demented AD patients. Tracer uptake was highest in the orbitofrontal cortex. Decreased 11C-PIB uptake in white-matter regions in this patient population may be a marker of white-matter damage in AD.

Foi realizada a comparação entre os testes de eritroimunoadsorção por captura (EIAC), imunoenzimático (ELISA) e de hemaglutinação passiva (HAP) utilizados no diagnóstico da neurocisticercose. Foram comparados dois testes já anteriormente utilizados na rotina diagnóstica da neurocisticercose (ELISA e HAP) e um recentemente padronizado (EIAC) para a detecção de anticorpos anti-Cysticercus cellulosae. O antígeno empregado nos três testes foi o extrato salino bruto (ESB), com um rendimento de 0,1; 1 e 1µg proteína/cavidade para os testes EIAC, ELISA e HAP, respectivamente. Quando se analisou um grupo de 58 pacientes com neurocisticercose, a sensibilidade observada foi de 98,2%, 84,5% e 77,2% nos testes ELISA, EIAC e HAP, respectivamente, para um grupo controle de 85 indivíduos, saudáveis ou com outras encefalotipatias, mas sem neurocisticercose, a especificidade foi de 94,1%, 95,3%, 91,8% , respectivamente, nos testes. Esta ordem de escolha poderia ser obedecida na medida dos recursos disponíveis.

Comparisons were made among the erythroimmunoadsorption by capture (C-EIA), the immunoenzymatic (ELISA) and passive haemaglutination (P.H.A.) tests used in the diagnosis of neurocysticercosis. The three tests, two of them routine by in diagnosis, and the third one (C-EIA) recently, standardised were compared for the detection of anti-Cysticercus cellulosae antibodies. In the three reactions the antigen utilized was raw saline extract (R.S.E) with a yield of 0.1, 1 and 10 µg protein/cavity for the C-EIA, ELISA and P.H.A tests, respectively. In a group of 58 patients with neurocysticercosis, the sensitivity to the ELISA, C-EIA and P.H.A tests was of 98.2%, 84.5% and 77,2%, respectively. In the control group of 85 individuals, healthy or with encephalopathies other than neurocysticercosis, the sensitivity was of 98.27%, 84.48% and 79.63%, respectively, and the specificity was of 94.1%, 95.3% and 91.8%. This order of choice should be followed, depending on the resources available.

Foi realizada a comparação entre os testes de eritroimunoadsorção por captura (EIAC), imunoenzimático (ELISA) e de hemaglutinação passiva (HAP) utilizados no diagnóstico da neurocisticercose. Foram comparados dois testes já anteriormente utilizados na rotina diagnóstica da neurocisticercose (ELISA e HAP) e um recentemente padronizado (EIAC) para a detecção de anticorpos anti-Cysticercus cellulosae. O antígeno empregado nos três testes foi o extrato salino bruto (ESB), com um rendimento de 0,1; 1 e 1µg proteína/cavidade para os testes EIAC, ELISA e HAP, respectivamente. Quando se analisou um grupo de 58 pacientes com neurocisticercose, a sensibilidade observada foi de 98,2%, 84,5% e 77,2% nos testes ELISA, EIAC e HAP, respectivamente, para um grupo controle de 85 indivíduos, saudáveis ou com outras encefalotipatias, mas sem neurocisticercose, a especificidade foi de 94,1%, 95,3%, 91,8% , respectivamente, nos testes. Esta ordem de escolha poderia ser obedecida na medida dos recursos disponíveis.

Comparisons were made among the erythroimmunoadsorption by capture (C-EIA), the immunoenzymatic (ELISA) and passive haemaglutination (P.H.A.) tests used in the diagnosis of neurocysticercosis. The three tests, two of them routine by in diagnosis, and the third one (C-EIA) recently, standardised were compared for the detection of anti-Cysticercus cellulosae antibodies. In the three reactions the antigen utilized was raw saline extract (R.S.E) with a yield of 0.1, 1 and 10 µg protein/cavity for the C-EIA, ELISA and P.H.A tests, respectively. In a group of 58 patients with neurocysticercosis, the sensitivity to the ELISA, C-EIA and P.H.A tests was of 98.2%, 84.5% and 77,2%, respectively. In the control group of 85 individuals, healthy or with encephalopathies other than neurocysticercosis, the sensitivity was of 98.27%, 84.48% and 79.63%, respectively, and the specificity was of 94.1%, 95.3% and 91.8%. This order of choice should be followed, depending on the resources available.