... per minute, while a normal heartbeat is 60 to 100). These fast, irregular signals cause many problems. The atria can no longer pump efficiently and some blood may stay there and clot, which increases the risk of stroke. Atrial fibrillation causes your heart to race and may prevent your heart from pumping enough blood and oxygen to meet your body's needs. Wolff ... ...

• Word Count: 2852
• Approx Pages: 11
• Grade Level: High School