How does high blood co2 affect heartrate?

High blood CO2 levels, a condition known as hypercapnia, can lead to an increase in heart rate (tachycardia) as the body attempts to compensate for decreased oxygen availability. Elevated CO2 levels can trigger the respiratory center in the brain to increase ventilation, while also stimulating the sympathetic nervous system, which can further elevate heart rate. This response helps to enhance oxygen delivery to tissues and remove excess CO2. However, prolonged high CO2 levels can lead to respiratory acidosis and may adversely affect cardiac function.