What immediate action is required for HACE and HAPE?

In the context of High Altitude Cerebral Edema (HACE) and High Altitude Pulmonary Edema (HAPE), the immediate action required is to evacuate the individual to a lower altitude, specifically to a medical officer who can provide further care. Both HACE and HAPE are severe altitude-related illnesses that can rapidly worsen and potentially become life-threatening.

Lowering the altitude is crucial because it helps alleviate the physiological stress the body faces at high elevations, where oxygen levels are low. Thus, immediate descent can significantly improve the person's condition and reduce the risk of complications. Access to a medical officer further ensures that appropriate medical intervention can be provided, such as oxygen therapy or medication if necessary.

Continuing ascent or simply resting without addressing the altitude can exacerbate the conditions associated with HACE and HAPE. Administering oxygen may be beneficial but does not address the root problem of altitude itself; thus, evacuation remains the priority action to take in these scenarios.