What is the time of useful consciousness (TUC) at 35,000 feet?

The time of useful consciousness (TUC) at 35,000 feet is approximately 30 seconds. This concept is critical in aviation and emergency medicine because it highlights the duration a person can maintain their cognitive and physical functions when exposed to reduced atmospheric pressure due to hypoxia. At this altitude, the lower oxygen levels can lead to a rapid onset of unconsciousness. The importance of recognizing TUC lies in the need for immediate action, such as initiating an emergency descent or using supplemental oxygen, to prevent loss of consciousness and preserve life. Understanding TUC can help individuals make informed decisions under hypoxic conditions, emphasizing the urgency of ensuring adequate oxygen supply in high-altitude scenarios.