Acapnial is a medical term that describes the absence of carbon dioxide in the blood. This condition can lead to a variety of health problems, including hyperventilation, dizziness, and shortness of breath. There are several other synonyms that can be used to describe this condition, including hypocapnia, respiratory alkalosis, and low carbon dioxide. Each of these terms refers to the same underlying issue, but may be used in different medical contexts depending on the specific symptoms being experienced. If you notice any symptoms of acapnial or any related conditions, it's important to seek medical attention as soon as possible to ensure proper diagnosis and treatment.