Résumé
Two newly synthesised polyurethanes were subjected to a preliminary study, in-vitro, on the interaction of cell polymer extract to understand the phenomenon of biodegradation by employing VERO cells. VERO cells exposed to the saline extract of the polymer showed cytopathic effect with granulations in the digestive vacuoles. It is suggested that the long term material performance of an implant-material can be evaluated by using VERO cells and/or macrophages and by analysing metabolic products secreted by the cells during interaction.
Sujets)
Animaux , Dépollution biologique de l'environnement , Stabilité de médicament , Polyuréthanes/composition chimique , Chlorure de sodium/composition chimique , Cellules Vero/métabolismeRésumé
Thirty two patients with acute onset of cardiac symptoms following an episode suggestive of viral infection, were studied. 11 patients had Coxsackie viral myocarditis. All had 4 fold rise of neutralising Coxsackie viral antibody titres on paired sera tested. Coxsackie B virus types 2 and 4 were commonly detected. Among the eleven patients, 8 presented with congestive heart failure, 2 with ventricular arrhythmias and one with chest pain and S3 gallop. All had ECG changes. Echocardiographic examination showed global left ventricular dysfunction in 7, regional wall motion abnormalities in 2 and normal left ventricular function in one. Serial echocardiographic examination showed progressive myocardial dysfunction in 3 and improvement in myocardial function in two patients. Two patients died during the follow up period. Echocardiography helped in assessing the course of patients with viral myocarditis.