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Subsets of functional neurological disorders include functional neurologic symptom disorder (FNsD) (conversion disorder), functional movement disorder, and functional seizures. The diagnosis is made based on positive signs and symptoms in the history and examination during consultation of a neurologist. [3]
Functional disorders can be treated successfully and are considered reversible conditions. Treatment strategies should integrate biological, psychological and social perspectives. The body of research around evidence-based treatment in functional disorders is growing. [43]
Conversion disorder is now partly contained under functional neurological symptom disorder (FNsD). In cases of conversion disorder, there is a psychological stressor. The diagnostic criteria for functional neurologic symptom disorder, as set out in DSM-5, are:
The criteria for dissociative identity disorder were expanded to include "possession-form phenomena and functional neurological symptoms". It is made clear that "transitions in identity may be observable by others or self-reported". [11]
Psychogenic non-epileptic seizures (PNES), also referred to as pseudoseizures, non-epileptic attack disorder (NEAD), functional seizures, or dissociative seizures, [2] [3] are episodes resembling an epileptic seizure but without the characteristic electrical discharges associated with epilepsy.
Cases involving these symptoms are classified as functional disorders ("functional" in this context is usually contrasted with the old term "organic disease"). For example, in functional neurologic disorder (FND), those affected present with various neurological symptoms such as functional seizures, numbness, paresthesia, and weakness, among ...
Functional weakness is weakness of an arm or leg without evidence of damage or a disease of the nervous system. Patients with functional weakness experience symptoms of limb weakness which can be disabling and frightening such as problems walking or a 'heaviness' down one side, dropping things or a feeling that a limb just doesn't feel normal or 'part of them'.
Functional visual loss (FVL) also known as Functional vision loss or Nonorganic visual loss (NOVL) is a reduction in visual acuity or loss of visual field that has no physiological or organic basis. This disease can come under the spectrum of functional neurological disorder or somatic symptom disorder .