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.
A. A. A. The main fibromyalgia signs and symptoms include deep muscle pain, painful tender points, and morning stiffness. Other major symptoms of fibromyalgia include sleep problems, fatigue, and anxiety. In order to make an accurate diagnosis, your doctor will need to review your symptoms and signs of fibromyalgia.he main fibromyalgia signs and symptoms include deep muscle pain, painful tender points, and morning stiffness. Other major symptoms of fibromyalgia include sleep problems, fatigue, and anxiety.