Principles of classification of motor disorders
Normally, any motor acts are inseparable from a person's emotions, drives, and dominant ideas. However, in psychoses (especially within catatonic syndrome), this connection breaks down. Unlike neurological pathology (e.g., hyperkinesia or tics), psychiatric motor disorders have no underlying structural organic defect, they are reversible, and patients completely lack insight into their condition.
In psychiatry, three main groups of motor sphere disorders are distinguished:
- Hyperkinesia — states of excitement.
- Hypokinesia — inhibition, the extreme manifestation of which is stupor.
- Parakinesia — distortion of normal movements.
Hyperkinesia (Excitement)
Excitement always signals an acute exacerbation of mental illness. This is productive symptomatology that is successfully managed by tranquilizers and antipsychotics. The severity of motor activity is usually directly proportional to the severity of the ongoing psychosis.
Two types of excitement are distinguished:
- Psychomotor agitation. Secondary to mental experiences. The patient's movements reflect their emotions: thrashing from hopelessness in depression, fleeing or defending oneself in intense terror, relentless craving for activity in mania.
- Pure motor agitation. Typical for catatonia. Movements are senseless, autonomous, and do not reflect the patient's internal needs in any way.
Of particular clinical significance is agitation limited to the bounds of the bed. Although such a patient is not dangerous to others, for themselves this is a critical condition. It indicates the highest risk of neurological and somatic complications, an extreme degree of exhaustion, and requires immediate resuscitation measures.
Hypokinesia and stupor
Stupor is an extreme degree of motor inhibition, complete immobility. Like hyperkinesia, this is a temporary (productive) disorder that responds well to medication. It is important to understand that the ability to move is not permanently lost; movements are blocked either due to excessively vivid emotions (fear, melancholy) or due to a generalized increase in muscle tone.
According to its origin, stupor can be:
- Emotionally conditioned (depressive, hysterical).
- Catatonic (senseless, without internal content).
There is also substupor — partial inhibition. In this state, the patient can move, but does so slowly. Motor dissociation is possible (when not all body parts participate in movement) and sudden freezing in bizarre postures.
Parakinesia and features of catatonic syndrome
Parakinesias represent non-goal-directed, mannered, and senseless motor acts. These include bizarre gait, rhymed broken speech, stereotypies. Most often they accompany catatonic and hebephrenic syndromes.
Catatonic syndrome (first described by K.L. Kahlbaum) is viewed today as a symptom complex of certain forms of schizophrenia. Its main feature is internal contradiction. Mutually exclusive symptoms can coexist in the same patient simultaneously: negativism and compliance, excitement and immobility.
Stupor and excitement in catatonia are closely intertwined. Inhibition can be abruptly replaced by impulsive chaotic actions, which is why they are considered as a single syndrome.
In a state of catatonic stupor, amimia and a lack of reactions to external stimuli (including pain) are observed. Patients do not feel fatigue, maintaining unnatural postures for a long time:
- Embryonic posture (knees pulled to the chest).
- Air pillow symptom (holding the head suspended above the bed).
- Hood symptom (throwing a sheet or robe over the head).
- Inappropriate choice of location (freezing in a squatting position by the radiator or standing by the window).
Briefly: answers to topical questions
Which neurotransmitters play a key role in the pathogenesis of catatonic stupor and excitement?
Sources do not establish a specific role for individual neurotransmitters precisely in the pathogenesis of catatonic stupor and excitement. The dopamine system is associated with productive disorders, including excitement. Glutamatergic neurons regulate the activity of the dopamine and serotonin systems; the involvement of the peptide system is also hypothesized. Blockers of glutamate NMDA receptors are capable of inducing both productive and negative symptoms.
What first-line medications are used to manage catatonic excitement?
Antipsychotic drugs (neuroleptics) and tranquilizers are used to manage excitement and specifically target catatonia.
For rapid management of all forms of psychomotor agitation, drugs with a pronounced sedative effect are used:
- Aliphatic phenothiazines — chlorpromazine, levomepromazine.
- Other neuroleptics — clozapine, olanzapine, chlorprothixene, droperidol.
For targeted effects on catatonia, drugs with selective antipsychotic effect are indicated:
- Butyrophenones — haloperidol.
- Other drugs — trifluoperazine, clozapine.
Also, for the pharmacological management of excitement, a benzodiazepine tranquilizer can be administered intravenously.
To easily remember the specific postures of a patient in catatonic stupor, imagine a strangely sleeping infant: curled up in the fetal position, head suspended in mid-air on an air cushion, with an improvised hood of blanket draped over the top.
Class and exam questions
How does catatonic agitation differ from psychomotor agitation?
Psychomotor agitation reflects the patient's emotions (e.g., an attempt to escape from an imaginary threat). Catatonic agitation is senseless, chaotic, and has no connection to internal psychological experiences.
Why is bed-bound agitation a critical sign?
This indicates the severe course of psychosis, which leads to colossal exhaustion of the body and a high risk of somatic complications. Such a condition requires resuscitative intervention.
Does the patient have insight into their bizarre postures and parakinesia?
No. Unlike neurological patients (e.g., with tics), psychiatric patients with catatonia do not realize the painful nature of their movements until the psychosis completely resolves.
What else to study on this topic
- Passive and active negativism in catatonia
- The mechanism of catalepsy (waxy flexibility)
- Echo-symptoms (echolalia, echopraxia, echomimia)
- Disinhibition of unconditioned reflexes against the background of immobility
- Specifics of automatic obedience
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Other topics in section "Chapter 13. Motor Sphere Disorders"
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