â¢ One plate is pushed beneath the other, or equivalent description. â¢ A trench may be formed at the subduction zone. (ii) Explain how subduction leads to volcanic activity. (2 points: 1 point for a correct explanation of one plate being pushed down and melted and 1. point for a correct explanation of molten material /magma rising to the surface near the zone)
Symptoms of atrial fibrillation occur when the upper chambers of the heart (atria) beat in a disorganized fashion. Atrial fibrillation is a type of arrhythmia. Characteristic symptoms include shortness of breath, palpitations, and lightheadedness.
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.