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.
These symptoms can last anywhere from several minutes to several hours. For those with chronic AFib, these symptoms can be persistent. Symptoms may develop occasionally and can sometimes resolve without medical treatment (paroxysmal AFib). In this case your doctor or cardiologist will prescribe a medication to control your symptoms. Controlling AFib symptoms. The main goal of controlling AFib symptoms is to prevent recurrent episodes.