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Related Concept Videos

Alterations in Muscle Tone ll01:12

Alterations in Muscle Tone ll

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Alterations in muscle tone are common manifestations of neurological disorders and reflect dysfunction within different nervous system regions. Spasticity, paratonia, and dystonia represent distinct forms of hypertonia, each with unique mechanisms, clinical features, and diagnostic importance.CharacteristicsSpasticity happens from upper motor neuron lesions and is characterized by velocity-dependent resistance to passive movement. Clinical features include:Exaggerated deep tendon reflexesClonus...
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Alterations in Muscle Tone lll01:11

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Rigidity and myotonia are distinct abnormalities of muscle tone that affect resistance and relaxation during movement. Although both involve altered muscle contraction, they arise from different neurological and muscular mechanisms.CharacteristicsRigidity is characterized by uniform resistance to passive movement across the entire range, independent of speed, affecting flexors and extensors equally. It may appear as lead-pipe rigidity (smooth, constant resistance) or cogwheel rigidity...
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Schizophrenia is a complex mental health disorder that can manifest with various positive symptoms, including thought, movement, and behavior disorders. These symptoms significantly disrupt cognitive and motor functions, leading to profound effects on an individual's ability to engage with the world.
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Cushing Syndrome I: Introduction01:26

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Cushing syndrome refers to the collection of clinical manifestations that arise when tissues are exposed to excessive amounts of cortisol or cortisol-like medications over an extended period. Cortisol, a glucocorticoid produced by the adrenal cortex, regulates metabolism, immune responses, and the body’s adaptation to stress. When its concentration remains chronically elevated, these physiological pathways become dysregulated, resulting in the characteristic features of the...
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Catenins01:23

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Catenins are characterized by multiple binding domains and dynamic structures that allow them to function as linker proteins in cell junction complexes. All catenins, except α-catenin, contain a characteristic protein sequence called the armadillo repeat and are therefore also called armadillo proteins.
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Cortisol production is normally governed by the hypothalamic–pituitary–adrenal (HPA) axis, which maintains hormonal balance through tightly regulated feedback mechanisms. Disruption of this regulatory system is central to the development of Cushing syndrome, whether the excess cortisol originates from external medications or internal pathology. Persistent cortisol elevation alters metabolism, immune function, and endocrine signaling, producing the characteristic clinical features...
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Related Experiment Video

Updated: May 5, 2026

Induction and Assessment of Levodopa-induced Dyskinesias in a Rat Model of Parkinson's Disease
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Cotard syndrome with catatonia: unique combination.

Aniruddha Basu1, Priti Singh, Rajiv Gupta

  • 1Department of Psychiatry, Pt. B.D. Sharma PGIMS, Rohtak, Haryana, India.

Indian Journal of Psychological Medicine
|November 20, 2013
PubMed
Summary

Cotard syndrome, a rare psychiatric condition with nihilistic delusions, rarely co-occurs with catatonia. This case highlights a unique pharmacotherapy response, offering insights into neurobiological determinants.

Keywords:
Catatoniacotard syndromelorazepam challenge test

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Area of Science:

  • Neuroscience
  • Psychiatry
  • Clinical Case Study

Background:

  • Cotard syndrome is a rare psychiatric disorder.
  • Characterized by profound nihilistic delusions.
  • Catatonia is a common motor disorder in psychiatric conditions.

Observation:

  • This report details an extremely rare co-occurrence of Cotard syndrome and catatonia.
  • The patient exhibited symptoms of both conditions.
  • The case focuses on the observed response to pharmacotherapy.

Findings:

  • The combined presentation of Cotard syndrome and catatonia is exceptionally rare.
  • Pharmacotherapy demonstrated a notable positive response in this specific case.
  • The study underscores the potential for shared neurobiological underpinnings.

Implications:

  • Understanding the neurobiology of rare psychiatric comorbidities is crucial.
  • This case provides valuable data on treatment efficacy for complex presentations.
  • Further research into neurobiological determinants of Cotard syndrome and catatonia is warranted.