What condition is characterized by no airflow in the lungs?

Apnea is defined as a temporary cessation of breathing, which can lead to a lack of airflow in the lungs. This condition can occur for various reasons including sleep apnea, neurological conditions, or as a result of sedation or anesthesia. When airflow is completely absent, it means that the exchange of gases in the lungs is also halted, leading to a state where oxygen cannot enter the bloodstream and carbon dioxide cannot be expelled.

In contrast, hyperventilation refers to an increased rate and depth of breathing, which does not imply a lack of airflow but rather an excess. Dyspnea is described as difficulty in breathing, which may still involve some airflow but indicates that normal breathing is compromised. Hypoxia refers to a deficiency of oxygen in the tissues, which may arise from various causes, including inadequate airflow, but does not specifically denote the absence of breathing or airflow. Therefore, the characteristics of apnea align with the definition of a condition marked by no airflow in the lungs.