What is the definition of "apnea"?

The term "apnea" refers specifically to the absence of breathing. This condition can occur for various reasons, such as obstructive sleep apnea, where a person's breathing repeatedly stops and starts during sleep, or central apnea, which involves the brain's failure to send signals to the muscles that control breathing.

In contrast, rapid breathing, shortness of breath, and difficulties during inhalation all indicate different respiratory issues. Rapid breathing, known as tachypnea, describes a situation where breathing becomes more frequent but does not necessarily involve a complete cessation of breath. Shortness of breath, or dyspnea, indicates a feeling of not being able to get enough air, while difficulties during inhalation might suggest an obstruction or other respiratory condition requiring further investigation. Understanding these distinctions is essential in the context of respiratory health, and recognizing apnea is a critical aspect in assessing a patient's respiratory status.