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activity intolerance, risk for

Vulnerable to experiencing insufficient physiological or psychological energy to endure or complete required or desired daily activities, which may compromise health. SEE: Nursing Diagnoses Appendix.

activity therapist

An allied health professional who assists patients or residents of care facilities with activities for leisure, recreation, habilitation, or rehabilitation purposes.


(ak″tŏ-mī′ŏ-sĭn) [act(in)- + myosin] The combination of actin and myosin in a muscle.




arteminisin-based combination therapies (drug combinations used to treat proven cases of malaria).


(ak′choo-ăl) [Fr. fr. L. actualis, active, practical] Real, existent.


(ak′choo-āt″ŏr) A component of a mechanical or electronic device that initiates a given action.


[L. acus, needle] Prefix meaning clarity, sharpness, or needle.


(ă-kū′ĭt-ē) [Fr. fr. L. acuere, to sharpen] 1. Clearness, sharpness of a sensory function, e.g., visual acuity. 2. In emergency and critical care medicine, the severity of a hospitalized patient's illness and the level of attention or service he or she will need from professional staff.

distance a. The ability to register optical details of objects that are far from the eye, e.g., on a chart positioned 20 ft away from the viewer in a test of visual acuity.

near a. The ability to register optical details when objects are only 12–14 in from the eye.

visual a. A measure of the resolving power of the eye. It is usually determined by one's ability to read letters of various sizes at a standard distance from the test chart. The result is expressed as a comparison: 20/20 is normal vision, meaning the subject has the ability to see from a distance of 20 ft (6.1 m) what a person with normal vision should see at that distance. Visual acuity of 20/40 means that a person sees at 20 ft (6.1 m) what a person with normal vision sees from a distance of 40 ft (12.2 m).

 DIAGNOSIS: The Snellen chart used for most purposes ranges from 20/10 to 20/200. People who can see no better than 20/200 are said to be legally blind. People with worse vision, e.g., 20/400 or worse, are said to have "count fingers" (CF) vision: they may not be able to read any of the letters or figures on an eye chart, but they can often see (and count) how many fingers are held in front of them from a specified distance. Those who cannot identify fingers from any distance may still see "hand motion" (HM), or they ...

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