RESUMEN
A total of 330 bee honey samples was analysed in 1986-1990, and the results are reported. Analysis was performed according to the method for the amitraz total residue determination by hydrolysis and steam distillation as described. 60% of the honeys were practically not contamined (total residue content amounting to 0.01 mg/kg), 8.5% of the honeys contained more than 0.05 mg/kg. Maximal values of 0.2-0.5 mg/kg were stated. 54% of the rape-honeys contained more than 0.01 mg/kg, 19% more than 0.05 mg/kg.
Asunto(s)
Miel/análisis , Insecticidas/análisis , Residuos de Plaguicidas/análisis , Toluidinas/análisis , Brassica/química , HidrólisisRESUMEN
The treatment of water, soil and food samples was tested with a modified equipment of glass for simultaneous steam distillation/solvent extraction. Spiked samples with 22 pesticides (most of them contained halogen) and PCB yielded good or very good recoveries after 1.5 h for water samples and after 5 h for soil and plant food samples, respectively. This method is ecologically beneficial, and because it needs only a small amount of solvent (less than 10 ml) it is not expensive and may be used as a quick screening in several fields.
Asunto(s)
Contaminantes Ambientales/análisis , Análisis de los Alimentos/métodos , Residuos de Plaguicidas/análisis , Bifenilos Policlorados/análisis , Plantas/química , Suelo/análisis , Contaminantes Químicos del Agua/análisisRESUMEN
Cats with brain cold injury and epidural balloon compression with sudden decompression were used as models of vasogenic or ischemic edema and vasoparalysis of the brain vessels. Dynamic CT scan and CT densitometric studies were performed to diagnose and differentiate between brain edema and vasoparalytic changes. The CT methods were found to be useful in CBF and edema zone estimation. The correlation of CT scan and CT densitometry enabled us to evaluate the degree of autoregulation disorders and can be also applied in clinical investigations.
Asunto(s)
Edema Encefálico/diagnóstico por imagen , Encéfalo/diagnóstico por imagen , Densitometría/métodos , Tomografía Computarizada por Rayos X/métodos , Barrera Hematoencefálica , Encéfalo/patología , Edema Encefálico/patología , Lesiones Encefálicas/complicaciones , Circulación Cerebrovascular , Frío/efectos adversos , Medios de Contraste , Descompresión/efectos adversos , Modelos Animales de Enfermedad , Azul de Evans/metabolismo , VasodilataciónRESUMEN
In 39 patients with intracranial lesions the resorption resistance was measured using an own computerized infusion test. A high usefulness of this test was demonstrated in the diagnosis of hydrocephalus and for establishing indications to ventriculocardiac valve implantation. In patients after craniocerebral injuries a rise was observed of the resorption resistance immediately after trauma in cases with subarachnoid haemorrhage. Later on, this resistance decreased gradually reaching a stable value after 1-2 years. Data obtained in the infusion test make possible establishing of optimal intracranial pressure and choice of an appropriate valve. The determination can be performed intraoperatively.
Asunto(s)
Lesiones Encefálicas/diagnóstico , Hidrocefalia/diagnóstico , Presión Intracraneal , Lesiones Encefálicas/líquido cefalorraquídeo , Computadores , Humanos , Hidrocefalia/líquido cefalorraquídeo , Infusiones Parenterales/métodos , Vértebras Lumbares , Canal MedularRESUMEN
The role of changes in CSF inflow in patients without intracranial pathology has been studied. The CSF outflow resistance has been calculated, by dividing the CSF pressure rise by the speed of intrathecal saline infusion. The average CSF pressure rise produced during infusion test (infusion 2 ml/min) amounted to 11.15 mmHg. The calculated CSF outflow resistance equaled to 5.58 +/- 1.1 mm Hg/ml/min. On-line computer assisted analysis during infusion test helps to shorten the procedure and makes it more precise.
Asunto(s)
Líquido Cefalorraquídeo/fisiología , Presión Intracraneal , Adulto , Neoplasias Encefálicas/líquido cefalorraquídeo , Femenino , Hemangiosarcoma/líquido cefalorraquídeo , Humanos , Desplazamiento del Disco Intervertebral/líquido cefalorraquídeo , Masculino , Persona de Mediana EdadRESUMEN
Extracranial hypertension was produced in cats by means of epidural compression with a baloon. After 2 hours of compression sudden decompression was performed and tissue pressure was compared at symmetrical sites of cerebral hemispheres with cerebrospinal fluid pressure measured in the cisterna magna. It was found that symmetrical tissue pystem, which was due probably to early oedema developing in the compressed area.
Asunto(s)
Encéfalo/fisiología , Líquido Cefalorraquídeo/fisiología , Animales , Gatos , Descompresión/instrumentación , Femenino , Masculino , PresiónRESUMEN
A new method of estimating intracranial decompensation in man is described. An on-line computer system is connected to an intracranial pressure (ICP) monitoring system to compute regression plots of mean ICP vs standard deviation; standard deviation is used as a measure of ICP instability. Two zones with distinctly different slopes are a characteristic feature of these plots. It is thought that the changes of slope signify intracranial decompensation.
Asunto(s)
Presión Intracraneal , Monitoreo Fisiológico/instrumentación , Humanos , Sistemas en Línea , Pulso Arterial , RespiraciónRESUMEN
The effect of prolonged mannitol infusion upon intraventricular pressure was investigated with the aid of a specially-designed automatic digital recording system; the data recorded were processed off-line by a minicomputer. The character of the pressure curves is thought to result from interaction between the mannitol effect and the observed system's shifting equilibrium position, which is caused by other factors. The character of the pressure curves prior to mannitol infusion must be taken into consideration in estimating the actual effect of the drug; the authors suggest that in certain cases it might be possible to decrease further the rate of mannitol administration. The advantages of statistical approach to the evaluation of intracranial pressure variations are discussed.