As a medical professional with expertise in neurology, I can tell you that the timeline for brain damage due to lack of oxygen, or hypoxia, can vary depending on several factors including the severity of the oxygen deprivation and the individual's overall health. However, it is well-established that brain cells are very sensitive to a lack of oxygen. In severe cases, some brain cells can begin to die within as little as 5 minutes after the oxygen supply is cut off. This rapid onset of cell death can lead to severe brain damage or even death if the oxygen deprivation is not corrected quickly. read more >>

Brain cells are very sensitive to a lack of oxygen. Some brain cells start dying less than 5 minutes after their oxygen supply disappears. As a result, brain hypoxia can rapidly cause severe brain damage or death.read more >>