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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]
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.
dyssynergyrecruitment 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)
Accessory muscles used to achieve voluntary movements
Wide arc movements and past pointing
|Dysrhythmia||Abnormal timing and coupling of voluntary movements|
Abnormal timing and coupling of voluntary movements during gait
|Dysmetria||The 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 gait||Uncoordinated ataxic 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