Basically acute cocaine intoxication means that the person is experiencing the immediate effects of cocaine, probably in large amounts. Without more specific information as to the person's behavior, it is difficult to describe what symptoms the person is demonstrating, but obviously the person is under the influence of a drug. Probably the person's mental state is affected; the behavior may be inappropriate, pupils dilated, pulse rapid and the blood pressure elevated. The person probably is either slowed way down, or stimulated and inappropriate, unable to think or talk logically.
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I am so sorry to hear of the death of this person from cocaine. Cocaine constricts blood vessels, and it the blood vessels in the heart are affected, it cuts off the circulation to the heart muscle and the person can have a heart attack. If this happens in an artery or arteries in the brain, the person can have a stroke. In addition, cocaine can cause life-threatening arrythmias of the heart. There is no way to know when a person will die from cocaine. Cocaine may be used many times without one devastating effects, or may be used once and cause death.
I see that a Dr. Gaurav is wanting to answer this question. I will submit this answer and if he provides a clearer explanation, feel free to accept his answer. Again, my deepest sympathies.