| rebound | Just like a rebound in basketball when the ball reverses its course and bounces back off the backboard, in medicine a rebound is a reversal of response upon withdrawal of the stimulus. (12 Dec 1998) |
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| rebound effect | The characteristic of a drug to produce reverse effects when either the effect of the drug has passed or when the patient no longer responds to the drug. (18 Nov 1997) |
| rebound phenomenon | Generally, any phenomenon in which a variable that has been displaced from its normal state by a disturbing influence temporarily deviates from normal in the opposite direction when the disturbing influence is suddenly removed, before finally stabilizing at its normal state, i.e., a phenomenon involving undershoot; e.g., the subsequent hypoglycaemia that may follow injection of glucose, because the initial hyperglycaemia caused excessive secretion of insulin. Synonym: Stewart-Holmes sign (05 Mar 2000) |
| REM | <radiobiology> The conventional unit of dose equivalent. The dose equivalent in rem is numerically equal to the absorbed dose, D, in rad multiplied by the quality factor Q. 1 rem = 0.01 sievert. (See sievert, rad). Note: for most medical applications involving X-ray or gamma emitters, the numerical values of the absorbed dose in rad, dose equivalent in rem and exposure in R are roughly equivalent numerically. (16 Dec 1997) |
| REM behaviour disorder | A disorder characterised by lack of the atonia of voluntary muscles that normally occurs in REM sleep. (05 Mar 2000) |
| REM stage sleep | <physiology> A stage of deep sleep that is accompanied by rapid eye movement and muscle paralysis. Vivid dreams can be recalled in over 80% of patients who awake from REM stage sleep. (27 Sep 1997) |
| REM syndrome | <syndrome> A reticular erythematous dermatitis of the upper trunk, more common in women, in which there is perivascular infiltrate of lymphocytes, few plasma cells, and upper dermal deposits of mucin; worsens on exposure to ultraviolet light. Synonym: reticular erythematous mucinosis. (05 Mar 2000) |
| sleep, rem | A stage of sleep characterised by rapid movements of the eye and low voltage fast pattern eeg. It is usually associated with dreaming. (12 Dec 1998) |