Hypercapnia
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![Main symptoms of Carbon dioxide toxicity, by increasing volume percent in air.[2][3]](/Images/godic/202501/03/Main_symptoms_of_carbon_dioxide_toxicity.svg4550.png")
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Hypercapnia, also known as CO2 retention, hypercapnea, and hypercarbia, is a condition of abnormally elevated carbon dioxide (CO2) levels in the blood. Carbon dioxide is a gaseous product of the body's metabolism and is normally expelled through the lungs.