dyssynergy


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Related to dyssynergy: ostial, schizonticide

dys·syn·er·gi·a

, dyssynergy (dis'sin-ĕr'jē-ă, -synĕr-jē)
An aspect of ataxia, in which an act is not performed smoothly or accurately because of lack of harmonious association of its various components; usually used to describe abnormalities of movement caused by cerebellar disorders.
[dys- + G. syn, with, + ergon, work]

dyssynergy

(dĭs-sĭn′ĕr-jē)
1. Uncoordinated contractions of muscle fibers (e.g., of the myocardium or of the urinary bladder when the external urinary sphincter is closed).
2. The tendency of one addiction to predispose a person to another.

dyssynergy

recruitment of accessory muscles to achieve voluntary movements, characteristic of ataxia and cerebellar disease, e.g. making a wide arc of motion when attempting to reach a goal, past pointing, asthenia and hyporeflexia (see Table 1)
Table 1: Characteristic limb effects of cerebellar lesions
CharacteristicMuscular effects
DyssynergyMuscular decomposition
Accessory muscles used to achieve voluntary movements
Wide arc movements and past pointing
Aesthenia
Hyporeflexia
DysrhythmiaAbnormal timing and coupling of voluntary movements
Abnormal timing and coupling of voluntary movements during gait
DysmetriaThe loss of ability to gauge distance and speed, and strength and velocity of voluntary movement
The loss of ability to gauge distance and speed, and strength and velocity of voluntary movement during gait
Abnormal gaitUncoordinated ataxic gait
Wide-based gait
Slow, jerky, irregular cadence
Variation of stride length and foot placement from step to step, often with loss of balance
'Double tap' foot sounds, where foot contact occurs audibly in two phases: heel strike and toe contact
Constant postural adjustment