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, known as AF or Afib, is an irregular and often very fast heart rate. This may cause symptoms like heart palpitations, fatigue, and shortness of breath. Treating atrial fibrillation is important because it may cause a stroke and negatively impact your quality of life.
Uterine Fibroids: Symptoms and Causes Uterine fibroids: symptoms and causes Often, fibroids do not show any symptoms and are only discovered during routine check-ups. But around one in every three women with fibroids will experience some symptoms which will interfere with daily life.