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.
Signs and Symptoms. Symptoms of fibroids may include: 1  Heavy Vaginal Bleeding â Excessively heavy or prolonged menstrual bleeding is a common symptom. 2  Women describe soaking through sanitary protection in less than an hour, passing blood clots and being unable to leave the house during the heaviest day of flow.