Atrial flutter is a type of irregular heartbeat, or an arrhythmia. It causes your heart to beat too fast. Atrial flutter doesn't always have symptoms, but it can sometimes have serious consequences if ...

Flutter valves are handheld devices that help people with chronic obstructive pulmonary disease (COPD) clear excess mucus from their airways. They work by combining positive expiratory pressure with ...

When your electrical system is working normally, the two upper chambers of the heart (atria) contract and pump blood into the two lower chambers (ventricles) in a well-coordinated way. This results in ...