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.
There are a number of temporary (acute) that can cause atrial fibrillation (AFib). For the most part, when the temporary condition ceases or is treated, AFib usually is resolved. Many of the acute conditions listed can cause chemical imbalances that may lead to electrical imbalances in your heart, triggering AFib.