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Heart rhythm problems — this is a much more serious cause of passing out, and people can faint with no warning, McGowan says. It’s much more common in older people or patients with heart disease.
Syncope ((syncope ⓘ), commonly known as fainting or passing out, is a loss of consciousness and muscle strength characterized by a fast onset, short duration, and spontaneous recovery. [1] It is caused by a decrease in blood flow to the brain , typically from low blood pressure . [ 1 ]
Reflex syncope can occur in otherwise healthy individuals, and has many possible causes, often trivial ones such as prolonged standing with the legs locked. [citation needed] The main danger of vasovagal syncope (or dizzy spells from vertigo) is the risk of injury by falling while unconscious.
Epilepsy is a group of non-communicable neurological disorders characterized by recurrent epileptic seizures. [10] An epileptic seizure is the clinical manifestation of an abnormal, excessive, and synchronized electrical discharge in the neurons. [1]
Dysautonomia can be fatal due to pneumonia, acute respiratory failure, or sudden cardiopulmonary arrest. [5] Autonomic dysfunction symptoms such as orthostatic hypotension, gastroparesis , and gustatory sweating are more frequently identified in mortalities.
If a dangerous heart rhythm does not stop by itself and is left untreated, the person may have a fatal cardiac arrest. However, blackouts can occur in those with Brugada syndrome despite a normal heart rhythm, because of a sudden drop in blood pressure, known as vasovagal syncope. [2]
Sudden unexpected death in epilepsy (SUDEP) is a fatal complication of epilepsy. [1] It is defined as the sudden and unexpected, non-traumatic and non-drowning death of a person with epilepsy, without a toxicological or anatomical cause of death detected during the post-mortem examination.
Lightheadedness is very similar to pre-syncope. Pre-syncope is the immediate stage before syncope (fainting), particularly in cases of temporary visual field loss (i.e. vision getting "dark" or "closing in").