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A heart rate in adults that is greater than 100 beats per minute is technically defined as Tachycardia. Many things can cause tachycardia like fever, shock, medications, stress, metabolic dysfunction, or damage to the heart muscle and hypoxemia to name a few. Perfusion problems may develop when the heart beats too fast and the ventricles are not able to fully fill with blood. This can cause a decrease in cardiac output, poor perfusion and hemodynamic instability. It’s important to quickly assess the patient's signs and symptoms and see if they are a result of the tachycardia, find the underlying causes and treat them.