RESUMO
In view of the higher prevalence of severe ischemic stroke among patients with atrial fibrillation (AF) and of the recently reported higher frequency of stroke with AF in females, 516 consecutive patients with ischemic stroke, of whom 93 had AF, were retrospectively evaluated. The main anamnestic, clinical and laboratory features of the AF and non-AF groups were statistically compared and the features of the AF group were statistically evaluated according to gender and age. Our results confirm the greater severity of stroke in AF patients than in non-AF patients and the higher frequency of stroke with AF in female patients. Moreover, a significantly higher frequency of stroke with AF was found in the male 60-69 and the female 80-89 age groups than in the other age groups. Relevant risk factors in females aged 80-89 were hypertension and left ventricular hypertrophy (LVH), while diabetes, alcohol, smoking and LVH prevailed among 60-69 year old males.
Assuntos
Fibrilação Atrial/complicações , Isquemia Encefálica/complicações , Transtornos Cerebrovasculares/complicações , Adulto , Fatores Etários , Idoso , Idoso de 80 Anos ou mais , Isquemia Encefálica/diagnóstico , Isquemia Encefálica/epidemiologia , Transtornos Cerebrovasculares/diagnóstico , Transtornos Cerebrovasculares/epidemiologia , Eletroencefalografia , Feminino , Humanos , Incidência , Masculino , Pessoa de Meia-Idade , Estudos Retrospectivos , Fatores de Risco , Índice de Gravidade de Doença , Fatores Sexuais , Tomografia Computadorizada por Raios XRESUMO
We performed a CT dynamic study during the first pass of an intravenously injected bolus of a iodinated contrast medium, followed by generation of the regional arm-brain circulation time (rABCT) image, in 11 patients with vascular malformations. All lesions could be detected as changes of rABCT, and the comparison with values of normal arteries and veins allowed the deduction of the hemodynamic conditions of the lesions. Seven cases showed evidence of altered distribution of rABCT in the corresponding brain hemisphere, suggesting a perfusion reserve impairment.
Assuntos
Angiografia/métodos , Malformações Arteriovenosas/diagnóstico por imagem , Aneurisma Intracraniano/diagnóstico por imagem , Tomografia Computadorizada por Raios X/métodos , Fístula Arteriovenosa/diagnóstico por imagem , Neoplasias Encefálicas/diagnóstico por imagem , Doenças das Artérias Carótidas/diagnóstico por imagem , Seio Cavernoso/diagnóstico por imagem , Apresentação de Dados , Hemangioma/diagnóstico por imagem , Humanos , Iohexol , Intensificação de Imagem Radiográfica , Técnica de Subtração , Fatores de TempoRESUMO
An application of angio CT as an adjunct to contrast enhancement evaluation of cerebral lesions is presented. We performed rapid sequential scanning following intravenous bolus injection of an iodinated contrast medium, analyzed the time contrast curves and generated a functional circulation time image. This was accomplished by calculating on a pixel-by-pixel basis the first mathematical moment of the monitored time-density curves about injection time which corresponds to regional arm brain circulation time (rABCT). This method increased the rate of detection of cerebral lesions by contrast enhancement from 30 to 90%.
Assuntos
Encefalopatias/diagnóstico por imagem , Meios de Contraste , Intensificação de Imagem Radiográfica/métodos , Tomografia Computadorizada por Raios X , Isquemia Encefálica/diagnóstico por imagem , Neoplasias Encefálicas/diagnóstico por imagem , Angiografia Cerebral , Infarto Cerebral/diagnóstico por imagem , Circulação Cerebrovascular , Humanos , Aneurisma Intracraniano/diagnóstico por imagem , Valores de ReferênciaRESUMO
A method for investigating the linearity between blood flow and distribution of 99mTc-HM-PAO uptake in patients undergoing single photon emission computed tomography (SPECT) is presented. This method, based on particular elaboration techniques of sequential multiple acquisitions, provides a local index: cumulative transit time (CTT) related to all factors, other than blood flow, affecting 99mTc-HM-PAO uptake. Because a correct qualitative blood flow estimation is based on the uniformity of the above factors, the occurrence of a change of this index indicates a nonlinear relation between blood flow and 99mTc-HM-PAO uptake distributions. It was shown that although linearity between blood flow and 99mTc-HM-PAO uptake may be questionable, a qualitative assessment of blood flow was correct in 100% of ischemic patients. In nonischemic patients this percentage fell to 60%.