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.
Symptoms of Uterine fibroids. The list of signs and symptoms mentioned in various sources for Uterine fibroids includes the 20 symptoms listed below: No symptoms - many fibroids caused no symptoms and are found only in routine gynecological exams or antenatal care. Menstrual symptoms Pelvic pain. Pelvic discomfort.