Differential Diagnosis: Tics or Epilepsy?
Epilepsy is one of the most common diseases in childhood and is characterized by a huge variety of manifestations. The main difficulty when suspecting tic disorders is that minor and myoclonic seizures visually look very much like tics. Observers may regard these muscle twitchings as a bad habit or mischievousness.
Depending on the clinical course, different variants of epilepsy are distinguished:
- Benign forms: resolve completely as the child grows older. These include pyknolepsy (frequent minor seizures), juvenile myoclonic epilepsy, and rolandic epilepsy (rare seizures affecting the face, throat, and tongue).
- Malignant forms: West syndrome (onset before 1 year of age, more common in boys, manifesting as head nods, propulsions, and developmental delay) and Lennox-Gastaut syndrome (occurring at 1–8 years of age, accompanied by atypical seizures).
Status epilepticus occurs in children 3–5 times more often than in adults (up to 25% of cases), but proceeds more favorably and less frequently leads to a fatal outcome. In malignant variants, standard anticonvulsants often do not work, therefore ACTH analogues (e.g., tetracosactide in West syndrome) and nootropic agents (piracetam, pyritinol) may be used.
Features of other psychogenic disorders in children
In addition to tics and seizures, phobias and hysterical reactions are common in childhood and have age-specific features:
- Phobias: School-age children predominantly have fears of the dark, loneliness, separation from parents or their death, as well as school phobia. In adolescents, hypochondriacal and dysmorphophobic fears come to the fore. They are provoked by overprotection and family conflicts against the background of an anxious-suspicious character of the child.
- Hysterical neurosis: Full-blown hysterical seizures do not occur in children. A specific manifestation is breath-holding spells. In response to a parental ban, the child starts crying loudly, breathing stops, they turn cyanotic, and lose consciousness for a few seconds. Unlike in adults, this occurs with equal frequency in boys and girls.
Specifics of pediatric psychopharmacology
Indications for prescribing psychopharmacological agents (PPAs) in children are the same as in adults, however, pharmacokinetics has critical differences. The pediatric central nervous system has high sensitivity (higher risk of tardive dyskinesia from antipsychotics), and the liver and kidneys work very actively, accelerating metabolism.
In addition, in younger children, excess adipose tissue accumulates lipophilic drugs, rendering them inactive, whereas in older children, fat is, conversely, scarce. Because of this, children require relatively high doses relative to body weight.
Paradoxical reactions are common:
- Sedatives (benzodiazepines, barbiturates, valerian) cause disobedience, disinhibition, and hyperactivity.
- Psychostimulants, conversely, improve behavioral regulation.
Dosage calculation and drug selection
Drug doses for children must be calculated exclusively based on body surface area. Adult dosages are applicable only to older adolescents.
Conversion factors from adult dose:
- Neovate / Newborn (3 kg) — 0.12
- 1 year (10 kg) — 0.28
- 6 years (25 kg) — 0.5
- 14 years (50 kg) — 0.9
When choosing therapy, the prescription of sedatives is strictly restricted, as they impair memory and reduce academic performance. Preference is given to nootropics. High-potency neuroleptics in small doses are chosen among antipsychotics (haloperidol, risperidone). Antidepressants are not recommended (their efficacy is unproven, and childhood depressions often resolve on their own). For aggression, small doses of antipsychotics are used together with mood stabilizers (carbamazepine, valproates).
Rules of care and hospitalization
Children tolerate separation from family very poorly, so treatment at home (outpatient) is always preferable. Hospitalization is indicated only for acute psychoses, expert evaluations in adolescents, or if mild disorders are provoked by an unfavorable home environment.
Features of work in a pediatric hospital:
- Tone of communication: A strict and persistent style is permissible. This does not scare the child, but gives them a sense of security and discipline.
- Supervision: Children must categorically not be left unattended. They do not need privacy (unlike adults); constant monitoring is needed to prevent mischief.
- Condition assessment: Children rarely complain verbally. The physician evaluates them objectively by observing their play and activity.
- Somatic masks: Psychological stress often manifests physically—in the form of vomiting or diarrhea.
Briefly: answers to topical questions
What drugs are used for the specific therapy of West syndrome?
For the specific therapy of West syndrome, a synthetic analogue of adrenocorticotropic hormone (ACTH) — tetracosactide (Synacthen Depot) — is used, which is effective in this malignant variant of epilepsy. Typical anticonvulsants are ineffective in malignant variants.
What side effects do typical antipsychotics cause in children?
In children, due to the high sensitivity of the central nervous system to psychopharmacological agents, there is a high probability of developing tardive dyskinesia when taking antipsychotics.
Neurological side effects of antipsychotics include:
- Acute dystonia — painful spasms of the face, neck, and tongue.
- Drug-induced parkinsonism — associated with the use of high doses of active antipsychotics.
- Akathisia — a constant urge to change body position, continuous movement, and insomnia due to motor restlessness.
- Tardive dyskinesia — persistent hyperkinesias of the face and head, including chewing, lip-smacking, and blinking.
For dose calculation, remember: we rely on surface area, not mass! (Body surface area is the main criterion in pediatrics).
Class and exam questions
Why is it necessary to rule out epilepsy when tics are suspected?
Minor and myoclonic seizures outwardly resemble muscle twitching, which is why parents and teachers often mistakenly take them for tics or fooling around.
How to calculate the dose of a psychotropic drug for a child?
The calculation is performed based on body surface area. For example, for a 6-year-old child (25 kg), the dose will be 0.5 of the standard adult dose.
How do children react to sedatives?
Children often exhibit a paradoxical reaction: instead of calming down, medications (including valerian and benzodiazepines) cause disinhibition, disobedience, and hyperactivity.
Can children with mental disorders be left alone in the hospital?
Categorically no. Unlike adults who require privacy, children need constant supervision to monitor their condition and prevent mischief.
What else to study on this topic
- West syndrome and Lennox-Gastaut syndrome: detailed clinical picture
- Mechanism of development of breath-holding spells in children
- Specifics of pharmacokinetics of lipophilic drugs in early childhood
- The role of bodily and tactile contact in the mental development of the child
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