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A medical death is usually called when a person is 'brain dead', meaning that when doctors and coroners are needed to give the time of death, they give the time when electrical activity in the brain has ceased.
stroke or even death... i think?
Brain death is irreversible because once the brain has reached a state where all functions have permanently ceased, there is no capability for recovery or regeneration. The extensive damage to the brain's vital structures and functions is not compatible with sustaining life, resulting in permanent cessation of all brain activity.
death
Brain death is the irreversible loss of all brain function, including the brain stem, resulting in the cessation of all neurological activity, whereas cardiac death is the irreversible stoppage of the heart, leading to the cessation of circulation and oxygen delivery to vital organs. Brain death is considered the legal and medical standard for determining death in many countries, while cardiac death is when the heart stops beating and cannot be restarted.
With the heart not beating anymore, oxygenated blood will no longer be pumped to the brain. This in term will slowly starve to death of oxygen, this, in most cases, is around the three minute mark.
Clinical death. Clinical death means the heart stops beating and a person stops breathing, at this stage a person can still be resuscitated. However while in this condition blood stops flowing to the brain and as a result the brain does not get the oxygen it requires to survive. if this condition lasts for too long then the brain dies. the result of which is that the body has no director to make it function properly and will die as well as a result.
Brain death can't be determined if the heart has already stopped, this would be considered cardiac death. Brain death is determined when someone is on a ventilator (not breathing on their own due to injury or illness) and an EEG or other procedure has been completed and shows no signs of brain activity. The body will continue to "live" with the help of the ventilator oxygenating the organs, but when taken off the ventilator then the body has no impulse to breathe for itself due to the brain being dead.
When a person's heart temporarily stops beating this is called sudden cardiac arrest. Sudden cardiac arrest can happen due to congestive heart failure, inflammation of the heart, heart attack and cardiomyopathy.
If a person's heart stops beating - and nothing is done to try to restart it - they will suffer irreparable brain damage - and possibly death.
Death.