Decolourization of dye-containing effluent using mineral coagulants produced by electrocoagulation.

The colour and colour causing-compounds has always been undesirable in water for any use, be it industrial or domestic wastewaters. The discharge of such effluents causes excessive oxygen demand in the receiving water and then a treatment is required before discharge into ecosystems. This study examined the possibility to remove colour causing-compounds from effluent by chemical coagulation, in comparison with direct electrocoagulation.

[When should mitral valve prolapse be considered a real disease?].

Mitral valve prolapse should be considered as a disease when superior displacement of the mitral leaflets during systole is more than 2 mm with a maximal leaflet thickness of at least 5 mm. Using these criteria, the prevalence of mitral valve prolapse is 1.3% in the general population, nearly the same in men and women.

Sleep apnoea syndrome and the extent of atherosclerotic lesions in middle-aged men with myocardial infarction.

Background: To determine whether extended atherosclerotic lesions are correlated to the presence of sleep breathing disorders.

Experimental Design: A prospective clinical study.

Setting: A tertiary regional referral center.

[Radiofrequency ablation in auricular flutter. Predictive factors of primary success and medium term results].

Ninety-one consecutive patients underwent radiofrequency ablation of chronic or paroxysmal atrial flutter. The average age of the patients was 66. There was a previous history of atrial fibrillation in 38% of cases and of cardiac surgery in 14.

[Ostial stenosis of the common trunk of the left coronary artery 20 years after mediastinal irradiation].

A 43-year-old woman with no risk factors received mediastinal radiotherapy of 35 Grays at the age of 23 years for Hodgkin's disease, followed by cure of the neoplastic disease. Twenty years later, following a threatened infarction syndrome, coronary angiography revealed ostial stenosis of the left coronary trunk. The course was rapidly unfavourable immediately following the examination.