![]() ![]() In atrial fibrillation, the heart's upper chambers (atria) contract randomly and sometimes so fast that the heart muscle cannot relax properly between contractions. This reduces the heart's efficiency and performance.Ītrial fibrillation happens when abnormal electrical impulses suddenly start firing in the atria. This process is repeated every time the heart beats. They then relax so the heart can fill with blood again. When the heart beats normally, its muscular walls tighten and squeeze (contract) to force blood out and around the body. Call 999 immediately as you need immediate treatment in hospital. also started with shortness of breath, sweating and feeling or being sick.spreads to your arms, back, neck or jaw.It's important to get medical advice to make sure it's nothing serious. ![]()
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