Hypocapnia/Hyperventilation 2 An ETCO₂ level lower than normal, less than 4.0 % (34 mmHg), is called hypocapnia. Kalenda, Mastering Infrared Capnography, p48, 1989 Spontaneous breathing can be instituted more easily by allowing the EtCO 2 rise at the end of the anesthesia and patient usually experiences a more rapid recovery.ĭuring lengthy anesthesia, there is typically a very gradual decrease in EtCO 2 due to the depressant effect of anesthetic agents and the effect of hypothermia slowing the patient’s metabolism.ġ Z. With normoventilation, disturbances in ventilation, circulation and metabolism can be more easily recognized and monitoring enables to maintain the physiologically optimal minute ventilation.
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