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.
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.