What condition results from a lack of oxygen to the brain?

The condition that results from a lack of oxygen to the brain is a stroke. A stroke occurs when the blood supply to part of the brain is interrupted or reduced, which deprives the brain of necessary oxygen and nutrients. There are two main types of strokes: ischemic, where a blood clot blocks blood flow to the brain, and hemorrhagic, where a blood vessel bursts. In both cases, the brain is unable to function properly due to the lack of oxygen, leading to potential brain damage and loss of function.

In contrast, cardiac arrest refers to the heart's inability to pump blood effectively, which can lead to a lack of oxygen throughout the body but is not limited to just the brain. Respiratory arrest is when breathing stops, which would subsequently lead to a lack of oxygen to the brain, but it is specifically related to the cessation of breathing rather than a direct impact on the brain. Hypotension pertains to low blood pressure and typically does not directly indicate a lack of oxygen to the brain; instead, it can be a symptom or cause of other conditions but is not the main condition itself stemming from oxygen deprivation.