The first and the most obvious sign would be the lack of ability to do vigorous activities like basket ball or sprinting 100m. Because oxygens will not be able to be supplied to parts of body efficiently, therefore it will result in losing ability to do sports.
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Low blood pressure or low oxygen saturation (%).
All blood coming from the heart travels through arteries but not all have high levels of oxygen.The blood that goes to the body is high in oxygen but the blood that goes to the lungs is low in oxygen.There it drops of carbon dioxide and picks up oxygen and carries this back to the heart to be pumped out to the body.
An ECG won't show oxygen levels in the blood - it simply records the patients heartbeat.
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The blood vessel that carries deoxygenated (low oxygen) blood away from the heart is called the pulmonary artery. This artery carries blood to the lungs where it picks up oxygen and then travels back to the heart to be pumped out to the cells of the body. The best way to remember this is to remember that pulmonary means lungs and artery means a blood vessel that carries blood away from the heart. Most arteries carry blood that is rich in oxygen. The pulmonary artery is an exception.