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.
1 Also called regurgitation, incompetence, or leaky valve, this occurs when a valve does not close tightly. 2  If the valves do not seal, some blood will leak backwards across the valve. 3  As the leak worsens, the heart has to work harder to make up for the leaky valve, and less blood may flow to the rest of the body.