Tachypnea and hyperventilation are often used interchangeably but they are two different events. While each term refers to rapid breathing, tachypnea involves shallow breaths while hyperventilation involves deep breaths. This is a small but important distinction. When someone is hyperventilating, they are blowing out too much carbon dioxide. That is why breathing into a paper bag can help. It's an easy and effective way to get carbon dioxide back into the body.
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