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. your heart rate is consistently lower than 60 or above 100 (particularly if you're experiencing other symptoms of atrial fibrillation, such as dizziness and shortness of breath). ![]()
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