absence(redirected from absences)
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Related to absences: petit mal epilepsy
ab·sence(ahb-sahns'), This word, based on French absence 'fit of abstraction', is correctly pronounced as in French, ahb-sahns', as shown here.
Paroxysmal attacks of impaired consciousness, occasionally accompanied by spasm or twitching of cephalic muscles, which usually can be brought on by hyperventilation; depending on the type and severity of the absence, the EEG may show an abrupt onset of a 3-second spike-and-wave pattern as in simple absence, or in atypical cases a 4-second spike-and-wave or faster spike complexes. The clinical states accompanying these EEG abnormalities may be classified as: 1) absence with no overt manifestations, for example, simple absence; epileptic absence; subclinical absence; 2) absence with clonic movements, for example, myoclonic absence; 3) absence with atonic states, for example, atonic absence; 4) absence with tonic contractions, for example, hypertonic muscular contraction; 5) absence with automatisms, for example, various stereotypic movements, usually of the face or hands; 6) absence with atypical features, for example, bizarre motor activity.
Farlex Partner Medical Dictionary © Farlex 2012
absenceAbsence attack, absence seizure, petit mal epilepsy Neurology A common form of childhood epilepsy characterized by episodic arrest of sensation and voluntary activity Clinical Transient loss of contact with the environment-eg brief staring spell, minimal motor manifestations, ± decline in school performance Diagnosis 3-mins of hyperventilation test may elicit an 'absence' Management Trimethadione, ethosuximide. Cf Grand mal seizure.
McGraw-Hill Concise Dictionary of Modern Medicine. © 2002 by The McGraw-Hill Companies, Inc.
absenceThe state of brief incommunicability and unresponsiveness which occurs repeatedly in the minor form of EPILEPSY known as PETIT MAL or which may occur in conjunction with other epileptic manifestations, or as a result of HYPERVENTILATION.
Collins Dictionary of Medicine © Robert M. Youngson 2004, 2005
Paroxysmal attacks of impaired consciousness, occasionally accompanied by spasm or twitching of cephalic muscles, which usually can be brought on by hyperventilation.
Medical Dictionary for the Dental Professions © Farlex 2012
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