12 patients who had atrial flutter without clinical, echocardiographic or angiographic evidence of aortic insufficiency were studied with simultaneous echo- and phonocardiograms. In patients with high-grade atrioventricular (AV) block, the mitral valve opened and closed with each flutter wave. Of seven patients, two had persistent and five had intermittent early mitral valve closure before QRS ...

The analysis of drop formation and the transition between separated non-separated oil–water flows enables us to better regulate flow parameters pipe inclination angle, which is great significance for improving efficiency oil transportation. Previous studies mainly carried out qualitative through experiments studied flows, very few are conducted on dual continuous or intermittent flow. In additi...