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 is often referred to as sick sinus syndrome because the sinoatrial (sinus) node in the right atrium controls the electrical impulses. The cause of atrial fibrillation is not always known. Conditions that can cause damage to the heart and lead to atrial fibrillation include: 1  high blood pressure.  congestive heart failure.
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).