Category: A
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Abdominal thrust
Treatment of airway obstruction that consists of inward and upward thrusts of the thumb side of a closed fist in the area between the umbilicus and the xiphoid process. If the patient is conscious, the procedure is performed from behind the person standing; if the patient is unconscious, it can be performed while kneeling beside…
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Antemortem thrombus
A clot formed in the heart or large vessels before death.
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Annular thrombus
A thrombus whose circumference is attached to the walls of a vessel, while an opening still remains in the center.
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Agonal thrombus
A blood clot formed in the heart just at the time of death.
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Arterial thrill
A thrill perceived over an artery.
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Aortic thrill
A thrill perceived over the aorta or aortic valve.
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Aneurysmal Thrill
A thrill felt on palpation of an aneurysm.
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Acoustic reflex threshold
The decibel level that provokes reflex contraction of the stapedius muscle. Tests that measure the triggering of the acoustic stapedius reflex are used to determine the presence of sensorineural hearing loss.
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Atomic theory
The theory that all matter is composed of atoms. The concept of an atom entails a central nucleus with a significant positive charge and substantial mass, surrounded by electrons orbiting at a relatively large distance from the nucleus.
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Activity theory
A social theory of aging that asserts that the more active older persons are, the higher their life satisfaction and morale. According to this theory, individuals who are aging successfully cultivate substitutes for former societal roles that they may have had to relinquish.