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Freediving blackout, breath-hold blackout, [1] or apnea blackout is a class of hypoxic blackout, a loss of consciousness caused by cerebral hypoxia towards the end of a breath-hold (freedive or dynamic apnea) dive, when the swimmer does not necessarily experience an urgent need to breathe and has no other obvious medical condition that might have caused it.
Rembrandt's Unconscious Patient (Allegory of Smell) shows a woman using smelling salts to revive a man who has fainted at the hands of a barber-surgeon. Solid ammonium carbonate and ammonium bicarbonate salts partly dissociate to form NH 3, CO 2 and H 2 O vapour as follows: (NH 4) 2 CO 3 → 2 NH 3 + CO 2 + H 2 O NH 4 HCO 3 → NH 3 + CO 2 + H 2 O
In the unconscious patient, the priority is airway management, to avoid a preventable cause of hypoxia. Common problems with the airway of patient with a seriously reduced level of consciousness involve blockage of the pharynx by the tongue , a foreign body , or vomit .
Unconsciousness may occur as the result of traumatic brain injury, brain hypoxia (inadequate oxygen, possibly due to a brain infarction or cardiac arrest), severe intoxication with drugs that depress the activity of the central nervous system (e.g., alcohol and other hypnotic or sedative drugs), severe fatigue, pain, anaesthesia, and other causes.
A choke-out is a hand-to-hand combat tactic involving the use of a chokehold to cause syncope, or temporary loss of consciousness, at which point the choke is released.. Common chokeholds in grappling used to accomplish a choke-out include the rear naked choke, arm triangle, triangle choke, and the guil
Hypnoanalysis is derived from the prefix hypno, which the French Étienne Félix d'Henin de Cuvillers first used to describe the hypnotic state. [3] The term hypnoanalysis was coined by James Arthur Hadfield, who claimed that he invented the term to describe the use of hypnosis to retrieve memories, particularly among patients who have amnesia. [4]
Cardiopulmonary resuscitation (CPR) is an emergency procedure consisting of chest compressions often combined with artificial ventilation, or mouth to mouth in an effort to manually preserve intact brain function until further measures are taken to restore spontaneous blood circulation and breathing in a person who is in cardiac arrest.
Seasickness is a form of motion sickness, a condition in which a disagreement exists between visually perceived movement and the vestibular system's sense of movement [38] characterized by a feeling of nausea and, in extreme cases, vertigo, experienced after spending time on a craft on water, [39] floating at the surface of a rough sea, and in ...