What is Oosaki Nana's respiratory disease in the cartoon Nana?

She suffers from hyperventilation syndrome.

Hyperanxiety syndrome is a physiological and psychological reaction caused by acute anxiety. During the attack, the patient will feel rapid heartbeat, palpitation and sweating. Because you can't feel breathing, you will breathe faster, which will lead to the continuous discharge of carbon dioxide and low concentration, causing symptoms such as secondary respiratory alkalosis. Excessive breathing is excessive breathing, causing respiratory alkalosis, numbness of hands and feet, and severe limb convulsions.

pathology

The ventilation per minute exceeds the metabolic demand of our human body, which leads to changes in hemodynamics and biochemistry [hyperventilation, increased oxygen content in blood, and a large amount of carbon dioxide being excreted, resulting in hypoxemia and respiratory alkalosis]. Cases will feel that they cannot absorb air due to lack of oxygen, thus becoming more nervous, and breathing will involuntarily become faster and coma.