ABSTRACT
Objective To observe the characteristics of the choroidal circulation in the macular area in patients with high myopia. Methods Fundus fluorescein angiography (FFA) and indocyanine green angiography (ICGA) were performed in 25 cases (44 eyes) with high myopia, 16 cases (20 eyes) of low to moderate myopia, and 19 cases (24 eyes) of normal eyes using TOPCON50IA fundus fluorescein photographic system. The filling time of fluorescence in the choroid at the earlier stage and the filling time of fluorescence in the choroidal vessels in each group were compared. The relationship of the abnormal fluorescence configuration and the blood perfusion in the choroidal capillary vessels with the corrected visual acuity was analyzed. Results The filling time of fluorescence in the choroid at the earlier stage in eyes with high myopia and the filling time of fluorescence in the choroid in the macular area were significantly different from those of the control ( P
ABSTRACT
Diagnosis of early Alzheimer's disease (AD) is still a clinical challenge,growing evidence indicated radionu-elide neuroimaging, especially positron emission computed tomography (PET), would be promising for the diagnosis of early AD. Studies showed reduction of cerebral blood flow and glucose metabolism occurring at the parietotemporal lobes of AD patients at the early stage. A study showed that PET detected AD with an accuracy greater than 90% 2. 5 years earlier than clinical diagnostic methods using electroencephalography, structural imaging studies and so on. Recent investigation aimed at senile plaques (SPs) and neurofibrillary tangles (NFTs) that were hallmark pathologies accompanying the neurodegeneration involved in AD. Some researchers used 2-(l-(6-[(2-18F]fluoroethyl) (methyl)amino]-2-naphthyl)ethylidene) malononitrile (C18F]FDDNP) , in conjunction with PET to determine the localization and load of NFTs and SPs in the brains of living AD patients. Monitoring SPs and NFTs development is expected to facilitate diagnostic of AD patients and assist in response-monitoring during experimental treatments.