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.
Review the available symptom checkers for these symptoms of Uterine fibroids: 1  Menstrual symptoms -- Symptom Checker. 2  Pelvic pain -- Symptom Checker. 3  Pelvic discomfort -- Symptom Checker.  Excessive menstrual bleeding -- Symptom 1  Checker. Vaginal discharge -- Symptom Checker.  Frequent urination -- Symptom 1  Checker. Infertility -- Symptom Checker.