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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.
The protocol was originally developed as a memory aid for rescuers performing cardiopulmonary resuscitation, and the most widely known use of the initialism is in the care of the unconscious or unresponsive patient, although it is also used as a reminder of the priorities for assessment and treatment of patients in many acute medical and trauma ...
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
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
The earliest recognition that placing unconscious patients on their side would prevent obstruction of the airway was by Robert Bowles, a doctor at the Victoria Hospital in Folkestone, England. [4] In 1891 he presented a paper with the title 'On Stertor, Apoplexy, and the Management of the Apoplectic State' in relation to stroke patients with ...
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.
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Spock using the Vulcan neck pinch, from the third-season episode "And the Children Shall Lead" (1968). In the fictional Star Trek universe, the Vulcan nerve pinch is a fictional technique used mainly by Vulcans to render unconsciousness by pinching a pressure point at the base of the victim's neck.