Asunto(s)
Datura stramonium/envenenamiento , Accidente Cerebrovascular/patología , Accidente Cerebrovascular/terapia , Diagnóstico Diferencial , Errores Diagnósticos/prevención & control , Femenino , Humanos , Persona de Mediana Edad , Accidente Cerebrovascular/diagnóstico , Resultado del TratamientoRESUMEN
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.
Asunto(s)
Fibrilación Atrial/complicaciones , Isquemia Encefálica/complicaciones , Trastornos Cerebrovasculares/complicaciones , Adulto , Factores de Edad , Anciano , Anciano de 80 o más Años , Isquemia Encefálica/diagnóstico , Isquemia Encefálica/epidemiología , Trastornos Cerebrovasculares/diagnóstico , Trastornos Cerebrovasculares/epidemiología , Electroencefalografía , Femenino , Humanos , Incidencia , Masculino , Persona de Mediana Edad , Estudios Retrospectivos , Factores de Riesgo , Índice de Severidad de la Enfermedad , Factores Sexuales , Tomografía Computarizada por Rayos XRESUMEN
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.
Asunto(s)
Angiografía/métodos , Malformaciones Arteriovenosas/diagnóstico por imagen , Aneurisma Intracraneal/diagnóstico por imagen , Tomografía Computarizada por Rayos X/métodos , Fístula Arteriovenosa/diagnóstico por imagen , Neoplasias Encefálicas/diagnóstico por imagen , Enfermedades de las Arterias Carótidas/diagnóstico por imagen , Seno Cavernoso/diagnóstico por imagen , Presentación de Datos , Hemangioma/diagnóstico por imagen , Humanos , Yohexol , Intensificación de Imagen Radiográfica , Técnica de Sustracción , Factores de TiempoRESUMEN
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%.
Asunto(s)
Encefalopatías/diagnóstico por imagen , Medios de Contraste , Intensificación de Imagen Radiográfica/métodos , Tomografía Computarizada por Rayos X , Isquemia Encefálica/diagnóstico por imagen , Neoplasias Encefálicas/diagnóstico por imagen , Angiografía Cerebral , Infarto Cerebral/diagnóstico por imagen , Circulación Cerebrovascular , Humanos , Aneurisma Intracraneal/diagnóstico por imagen , Valores de ReferenciaRESUMEN
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%.