Do You Have to Refrigerate Peanut Butter? Q: My family kept peanut butter in the fridge, but in college all my roommates kept peanut butter at room temperature and I loved how easy it was to spread! Now I keep my peanut butter at room temp too but I recently read you need to keep it in the fridge.
Mitral valve prolapse and regurgitation. When your heart is working properly, the mitral valve closes completely during contraction of the left ventricle and prevents blood from flowing back into your heart's upper left chamber (left atrium).he bulging may keep the valve from closing tightly. When blood leaks backward through the valve, it's called mitral valve regurgitation. This may not cause problems if only a small amount of blood leaks back into the atrium.
In mitral valve regurgitation, the mitral valve doesn't close tightly. With each heartbeat, some blood from the left ventricle flows backward into the left atrium instead of moving forward into the aorta. This essentially means that the heart pulls blood backward.ossible causes of mitral valve regurgitation include: 1  Mitral valve prolapse. 2  In this condition, the leaflets and tendon-like cords supporting the mitral valve weaken and stretch so that with each contraction of the left ventricle, the valve leaflets bulge (prolapse) into the left atrium.