What BAC level is associated with the risk of coma?

The blood alcohol concentration (BAC) level associated with the risk of coma is typically considered to be around 0.4%. At this level of intoxication, significant physiological effects occur, which include a high likelihood of depressed autonomic functions such as those that regulate breathing and heart rate. This suppression can lead to unconsciousness or a comatose state due to the extreme depressant effects of alcohol on the central nervous system.

When the BAC reaches 0.4%, the individual may experience severe impairment of judgment, motor coordination, and vital functions, making them particularly vulnerable to life-threatening conditions such as respiratory depression. Thus, this level is critical in discussions about alcohol poisoning and its potential consequences.

Levels above this, such as 0.5% and 0.6%, are typically associated with increased severity of potential outcomes, including death due to alcohol poisoning. However, the threshold for coma is often cited at around 0.4%, making it the correct choice in this context.