Margerey (J Path Bact 1949; 61:203-208) studied 250 mitral valves and postulated that the mechanism of formation is intimal damage due to mechanical trauma at the leaflet coaptation. The damaged area is covered by fibrin, which subsequently becomes uplifted, or partially detached from the valve surface.
Irving, TX Current Weather and Forecast. Irving, TX Weather Forecast. 3:20 PM CDT SAT APR 15 2017. TONIGHT - Partly cloudy this evening - then becoming mostly cloudy. Lows in the mid 60s. South winds 5 to 10 mph.
Key weather averages for Dallas in March. 1  20. 20Â°C max day temperature. 2  7. 7 hours of sunshine per day. 3  8. 8 days with some rainfall. 4  8. 8Â°C min night temperature. 5  12. 12 hours of daylight per day. 6  0. No heat & humidity. 7  74. 74 mm of monthly rainfall. 8  7. 7 (High) UV index.