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.
10 Signs of Fibromyalgia. 10 Signs of Fibromyalgia. Fibromyalgia is a musculoskeletal condition that causes widespread chronic pain and numerous other symptoms, the combination of which have earned it the medical appellation of a syndrome, i.e. Fibromyalgia Syndrome. It affects primarily women but men and children are not spared.