cogwheel rigidity


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Related to cogwheel rigidity: lead pipe rigidity

rigidity

 [rĭ-jid´ĭ-te]
inflexibility or stiffness.
clasp-knife rigidity increased tension in the extensor of a joint when it is passively flexed, giving way suddenly on exertion of further pressure; seen especially in upper motor neuron disease. Called also clasp-knife reflex.
cogwheel rigidity tension in a muscle that gives way in little jerks when the muscle is passively stretched; seen in parkinson's disease.
decerebrate rigidity see decerebrate rigidity.
decorticate rigidity see decorticate rigidity.
paratonic rigidity an intermittent abnormal increase in resistance to passive movement in a comatose patient.

cog·wheel ri·gid·i·ty

a type of rigidity seen in parkinsonism in which the muscles respond with cogwheellike jerks to the use of constant force in bending the limb.

cogwheel rigidity

Etymology: ME, cugge, tooth on a gear; AS, hweol + L, rigiditas, unbending
an abnormal rigor in muscle tissue characterized by jerky movements when the muscle is passively stretched. The condition is often found in cases of Parkinson's disease.
A circular jerking rigidity in flexion and extension in a background of tremor, which continues throughout an entire range of movement, a finding typical of parkinsonism; it may also be ‘smoothly’ rigid, in which case it is termed lead pipe rigidity

cog·wheel ri·gid·i·ty

(kog'wēl ri-jid'i-tē)
A type of rigidity seen in parkinsonism in which the muscles respond with cogwheellike jerks to the use of constant force in bending the limb.

cogwheel rigidity

alternating resistance to and compliance with imposed passive limb movement; characteristic of Parkinson's disease

rigidity

inflexibility or stiffness.

clasp-knife rigidity
increased tension in the extensor of a joint when it is passively flexed, giving way suddenly on exertion of further pressure; seen especially in upper motor neuron disease.
cogwheel rigidity
tension in a muscle that gives way in little jerks when the muscle is passively stretched.
lead-pipe rigidity
posture adopted when the rigidity of the limb is maintained equally throughout the passive flexion.
rigidity reflex
the state of immobility generated in female animals, especially those in estrus, when they make physical contact with a male.
References in periodicals archive ?
Table 19: Incidence of EPS Compared to Placebo in the Adjunctive Therapy Bipolar Depression Studies Placebo LATUDA (N=334) 20 to 120 mg/day (%) (N=360) Adverse Event Term (%) All EPS events 13 24 All EPS events, excluding Akathisia/ 9 14 Restlessness Akathisia 5 11 Dystonia * <1 1 Parkinsonism ** 8 13 Restlessness <1 4 Note: Figures rounded to the nearest integer * Dystonia includes adverse event terms: dystonia, oculogyric crisis, oromandibular dystonia, tongue spasm, torticollis, and trismus ** Parkinsonism includes adverse event terms: bradykinesia, cogwheel rigidity, drooling, extrapyramidal disorder, glabellar reflex abnormal, hypokinesia, muscle rigidity, parkinsonism, psychomotor retardation, and tremor
Table 18: Incidence of EPS Compared to Placebo in the Monotherapy Bipolar Depression Study LATUDA 20 to 60 80 to 120 Placebo mg/day mg/day (N-168) (N=164) (N=167) Adverse Event Term (%) (%) (%) All EPS events 5 12 20 All EPS events, excluding 2 5 9 Akathisia/ Restlessness Akathisia 2 8 11 Dystonia * 0 0 2 Parkinsonism ** 2 5 8 Restlessness <1 0 3 Note: Figures rounded to the nearest integer * Dystonia includes adverse event terms: dystonia, oculogyric crisis, oromandibular dystonia, tongue spasm, torticollis, and trismus ** Parkinsonism includes adverse event terms: bradykinesia, cogwheel rigidity, drooling, extrapyramidal disorder, glabellar reflex abnormal, hypokinesia, muscle rigidity, parkinsonism, psychomotor retardation, and tremor
While cogwheel rigidity is occasionally found in patients with essential tremor, other parkinsonian signs and symptoms are absent.
2,4,5) Be alert to early toxicity symptoms such as drowsiness, confusion, coarse hand tremor, worsening gastrointestinal complaints, dysarthria, impaired consciousness, cogwheel rigidity, and ataxia.