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.
The Rio grande valley between el paso and McAllen sees the hottest weather in the state with days above 120 deg F in the summer. This area is in the middle of the desert. However the months of November through May Texas has arguabl the best weather in the nation. Lows in the 40s heating up to mid 70s during the day.