2. A vessel approaching a blind bend in a river can sound one prolonged blast on the ships' whistle to alert any other vessels to its presence, if another vessel is nearby then they will respond with one prolonged blast on the ships' whistle.
Atrial fibrillation, known as AF or Afib, is an irregular and often very fast heart rate. This may cause symptoms like heart palpitations, fatigue, and shortness of breath. Treating atrial fibrillation is important because it may cause a stroke and negatively impact your quality of life.
Fast Facts: An Easy-to-Read Series of Publications for the Public. Fibromyalgia is a disorder that causes muscle pain and fatigue (feeling tired). People with fibromyalgia have pain and tenderness throughout the body. People with fibromyalgia may also have other symptoms, such as: 1  Trouble sleeping. 2  Morning stiffness.3  Headaches. 4  Painful menstrual periods. 5  Tingling or numbness in hands and feet.6  Problems with thinking and memory (sometimes called âfibro fogâ).eople with fibromyalgia have pain and tenderness throughout the body. People with fibromyalgia may also have other symptoms, such as: 1  Trouble sleeping. 2  Morning stiffness. 3  Headaches. 4  Painful menstrual periods. 5  Tingling or numbness in hands and feet. 6  Problems with thinking and memory (sometimes called âfibro fogâ).