AUTHOR AND EDITOR INFORMATION

Section 1 of 10  

• Authors and Editors
• Introduction
• Clinical
• Differentials
• Workup
• Treatment
• Medication
• Follow-up
• Miscellaneous
• References

INTRODUCTION

Section 2 of 10  

• Authors and Editors
• Introduction
• Clinical
• Differentials
• Workup
• Treatment
• Medication
• Follow-up
• Miscellaneous
• References

Background

Conversion disorder is classified as one of the somatoform disorders in the Diagnostic and Statistical Manual of Mental Disorders of the American Psychiatric Association, Fourth Edition, Text Revision (DSM-IV-TR). Although defined as a condition that presents as an alteration or loss of a physical function suggestive of a physical disorder, conversion disorder is presumed to be the expression of an underlying psychological conflict or need.

The presence of a psychological factor usually is not apparent initially but becomes evident in the history when a cause-effect relationship between an environmental event or stressor and the onset of the symptom is discovered. Symptoms are not intentionally produced but are the result of unintentional motives. This condition is not considered under voluntary control and, after appropriate medical evaluation, cannot be explained by any physical disorder or known pathological mechanism.

Though classified with somatoform disorders including hypochondriasis and body dysmorphic disorder, conversion disorder has long been assumed to be related to hysteria (Dissociative Disorders in DSM-IV). Clinical descriptions of conversion disorder date to almost 4000 years ago; the Egyptians attributed symptoms to a "wandering uterus." In the 19th century, Paul Briquet described the disorder as a dysfunction of the CNS. Freud first used the term conversion to refer to the substitution of a somatic symptom for a repressed idea.

Pathophysiology

Presenting symptoms can range far across the field of clinical neurology. Conversion reactions usually approximate lesions in the motor or sensory pathways of the voluntary nervous system. Symptoms most commonly reported are weakness, paralysis, sensory disturbances, pseudoseizures, and involuntary movements such as tremors. These losses or distortions of neurologic function cannot adequately be accounted for by organic disease. Involvement of the corticofugal inhibitory system has been suggested. Patient's whose symptoms are limited to pain or sexual functioning are not classified under conversion disorder; likewise, patients already classified as demonstrating somatization disorder or schizophrenia are also not classified under conversion disorder.

Diagnostic criteria for conversion disorder as defined in the DSM-IV are as follows:

• One or more symptoms or deficits are present that affect voluntary motor or sensory function that suggest a neurologic or other general medical condition.
• Psychologic factors are judged to be associated with the symptom or deficit because conflicts or other stressors precede the initiation or exacerbation of the symptom or deficit.
• The symptom or deficit is not intentionally produced or feigned (as in factitious disorder or malingering).
• The symptom or deficit, after appropriate investigation, cannot be explained fully by a general medical condition, the direct effects of a substance, or as a culturally sanctioned behavior or experience.
• The symptom or deficit causes clinically significant distress or impairment in social, occupational, or other important areas of functioning or warrants medical evaluation.
• The symptom or deficit is not limited to pain or sexual dysfunction, does not occur exclusively during the course of somatization disorder, and is not better accounted for by another mental disorder.

According to psychodynamic theory, conversion symptoms develop to defend against unacceptable impulses. Some write of primary gain, that is to say purpose of keeping an internal conflict or need from being realized. A fairly transparent example would be leg paralysis after an equestrian competitor is thrown from his or her horse. The symptom has a symbolic value that is a representation and partial solution of a deep-seated psychological conflict: to avoid running away like a coward, and yet to avoid being thrown again.

According to learning theory, conversion disorder symptoms are a learned maladaptive response to stress. Patients achieve secondary gain by avoiding activities that are particularly offensive to them, thereby gaining support from family and friends, which otherwise may not be offered.

Frequency

United States

True conversion reaction is rare. Predisposing factors include extreme psychosocial stress, and perhaps, rural upbringing. Some psychiatrists suspect that western society has incorporated Freudian notions of unconscious motivations and conflicts: conversion reactions have become too obvious to serve their purpose.

• Incidence has been reported to be 11-300 cases per 100,000 people.
• Cultural factors may play a significant role. Symptoms that might be considered a conversion disorder in the US may be a normal expression of anxiety in other cultures.
• One study reports that conversion disorder accounts for 1.2-11.5% of psychiatric consultations for hospitalized medical and surgical patients.

International

At the National Hospital in London, the diagnosis was made in 1% of inpatients. Iceland's incidence of conversion disorder is reported to be 15 cases per 100,000 persons.

Mortality/Morbidity

Patients diagnosed with conversion disorder may go on to demonstrate serious, traditional medical illness. This has been happening less and less often over the years (29% in 1950s down to 4% in 1990s). Unfortunately, emergency physicians may find themselves sorting out new neurologic symptoms in settings of terrible time pressure: populations statistics may be of little reassurance for any specific individual.

Sex

Sex ratio is not known although it has been estimated that women patients outnumber men by 6:1. This is of little help when evaluating an individual patient.

Age

• Conversion disorder may present at any age but is rare in children younger than 10 years or in persons older than 35 years. Some studies have reported another peak for patients aged 50-60 years.
• In a University of Iowa study of 32 patients with conversion disorder, however, the mean age was 41 years with a range of 23-58 years.
• In pediatric patients, incidence of conversion is increased after physical or sexual abuse. Incidence also increases in those children whose parents are either seriously ill or have chronic pain.

CLINICAL

Section 3 of 10  

• Authors and Editors
• Introduction
• Clinical
• Differentials
• Workup
• Treatment
• Medication
• Follow-up
• Miscellaneous
• References

History

Degree of impairment usually is marked and interferes with daily life activities. Prolonged loss of function may produce organic complications such as disuse atrophy or contractures.

• Weakness, paralysis, sensory disturbances, aphonia, deafness, blindness, pseudoseizures, and involuntary movements (eg, tremors) are the most frequent complaints. Symptoms often enable patients to avoid an unpleasant situation at home or work, attract attention, or gain support from others. This may become evident through careful questioning.
• The symptom must not be under voluntary control. Determining the symptom may be difficult, since it usually cannot be identified by observation. Features suggestive of voluntary control consist of variability, inconsistency, obvious and immediate benefit, as well as a personality that may suggest dishonesty and opportunism. Symptoms, if voluntary, tend to be self-limited and of brief duration.
• La belle indifférence was considered a classic feature of conversion disorder. It is characterized by the inappropriate and paradoxical absence of distress despite the presence of an unpleasant symptom. Patients often deny emotional difficulty. Unfortunately, la belle indifférence, histrionic personality, and secondary gain are clinical features that appear to have no diagnostic significance. They can easily be absent in patients with conversion disorder; they can be easily be present in patients with traditional neurologic disorder.
• One study reported 5 patients with hysterical conversion reactions after injury or infarction to the left cerebral hemisphere.

Physical

Absence of a physical disorder is an important diagnostic feature. Individuals with conversion disorder often have physical signs but lack objective neurological signs to substantiate their symptoms.

• Weakness
• • Weakness usually involves whole movements rather than muscle groups. Weakness affects the extremities more often than ocular, facial, or cervical movements.
  • With the use of various clinical techniques, weakness of one limb can be demonstrated to cause contraction of opposing muscle groups. Discontinuous resistance during testing of power or give-way weakness may exist. Muscle wasting is absent, and reflexes are normal.
• Sensory symptoms
• • Sensory loss or distortion often is inconsistent when tested on more than one occasion and is incompatible with peripheral nerve or root distribution.
  • Discrete patches of anesthesia or hemisensory loss that stop in the midline may be present.
  • Classic dermatomes in patients with numbness usually are not followed.
• Visual symptoms
• • Visual symptoms include monocular diplopia, triplopia, field defects, tunnel vision, and bilateral blindness associated with intact pupillary reflexes.
  • Optokinetic nystagmus may be observed in patients with apparent blindness when exposed to a rotating striped drum.
• Gait disturbances
• • Astasia-abasia is a motor coordination disorder characterized by the inability to stand despite normal ability to move legs when lying down or sitting.
  • Patients walk normally if they think they are not being observed.
  • Occasionally, while being observed, patients actively attempt to fall. This contrasts with those patients with organic disease who attempt to support themselves.
• Pseudoseizures
• • During an attack, marked involvement of the truncal muscles with opisthotonos and lateral rolling of the head or body is present. All 4 limbs may exhibit random thrashing movements, which may increase in intensity if restraint is applied.
  • Cyanosis is rare unless patients deliberately hold their breath.
  • Reflexes (eg, pupillary, corneal) are retained but may be difficult to test due to tightly closed lids.
  • Tongue biting and incontinence are rare unless the patient has some degree of medical knowledge about the natural course of the disease.
  • In contrast to true seizures, pseudoseizures primarily occur in the presence of other people and not when the patient is alone or asleep.

Causes

• True etiology is unknown. Most clinicians presume conversion reactions are caused by previous severe stress, emotional conflict, or an associated psychiatric disorder.
• Many studies confirm high incidence of depression in patients with conversion disorder. As many as half of these patients have personality disorders or display hysterical traits.
• In children, conversion disorder often is observed following physical or sexual abuse.
• Children who have family members with a history of conversion reactions are more likely to suffer from conversion disorder. In addition, if family members are seriously ill or in chronic pain, children are more likely to be affected.

DIFFERENTIALS

Section 4 of 10  

• Authors and Editors
• Introduction
• Clinical
• Differentials
• Workup
• Treatment
• Medication
• Follow-up
• Miscellaneous
• References

Other Problems to be Considered

Cerebellopontine angle tumors
Vertebrobasilar insufficiency
Creutzfeldt-Jakob disease
Acute compressive optic neuropathy

WORKUP

Section 5 of 10  

• Authors and Editors
• Introduction
• Clinical
• Differentials
• Workup
• Treatment
• Medication
• Follow-up
• Miscellaneous
• References

Lab Studies

• Carefully consider the possibility of an organic etiology.
• Some authors have suggested that unnecessary, painful, or invasive testing can result in reinforcement and fixation of symptoms and should be avoided when possible.
• Consider laboratory testing to exclude the following clinical entities:
• • Electrolyte disturbances
  • Hypoglycemia
  • Hyperglycemia
  • Renal failure
  • Systemic infection
  • Toxins
  • Other drugs

Imaging Studies

• A chest x-ray (CXR) may be considered to diagnose an occult neoplasm.
• CT scan or MRI may be performed to exclude a space-occupying lesion in the brain or spinal cord.

Other Tests

• An electroencephalograph may help distinguish pseudoseizures from a true seizure disorder.

Procedures

• Spinal fluid may be diagnostic in ruling out infectious or other causes of neurologic symptoms.

TREATMENT

Section 6 of 10  

• Authors and Editors
• Introduction
• Clinical
• Differentials
• Workup
• Treatment
• Medication
• Follow-up
• Miscellaneous
• References

Prehospital Care

Treat patients as if their symptoms have an organic origin. Prehospital personnel most often cannot distinguish a conversion reaction from an organic illness.

Emergency Department Care

Emergency physicians must be aware that the diagnosis of conversion disorder does not exclude the presence of underlying disease, and diagnosis should not be made solely on the basis of negative workup results. Approach each patient as if their symptoms had an organic basis, and treat them accordingly.

Consultations

Consultation is often necessary and should be considered during ED discharge planning for any patients without previous histories of conversion reaction.

• Consultation may be a cost-effective method to eliminate unnecessary hospitalization by streamlining these patients to appropriate outpatient psychiatric follow-up.
• Neurologic consultation may help if the neurological examination is equivocal.
• Psychiatric consultation may be necessary if an organic cause is virtually excluded. Thoughtful questioning may elicit the underlying stressor.
• Another treatment technique is suggestive therapy: an authoritative, not confrontative, pronouncement that "this problem usually resolves in a few hours" is often successful, especially with children. Appropriate attention, for example, repeated vital signs plus adjunctive antianxiety medication, can increase odds of success with adults.
• Other suggestive therapies for symptom removal include hypnosis and amobarbital interviews. Using a behaviorally oriented treatment strategy, the goals are to unlearn maladaptive responses and to learn more appropriate responses. Attempt to eliminate the patient's belief that the extremity is paralyzed by telling the patient (1) that all tests indicate the muscles and nerves are functioning normally, (2) the brain is communicating with the nerves and muscles, and (3) this apparent lost ability is recoverable. Confronting the patient with the fact that the symptoms are not organic is counterproductive.

MEDICATION

Section 7 of 10  

• Authors and Editors
• Introduction
• Clinical
• Differentials
• Workup
• Treatment
• Medication
• Follow-up
• Miscellaneous
• References

Drug therapy has not proven reliable. However, a number of psychiatrists recommend a sedative or antianxiety agent. It is usually easiest to give a benzodiazepine, eg, lorazepam 0.5-1 mg (along with a suggestion that symptoms are likely to remit in an hour or so). Amobarbital is falling out of favor as a sedative, or for an Amytal interview, but has been a traditional medication.

FOLLOW-UP

Section 8 of 10  

• Authors and Editors
• Introduction
• Clinical
• Differentials
• Workup
• Treatment
• Medication
• Follow-up
• Miscellaneous
• References

Further Outpatient Care

• Any patient diagnosed with a conversion reaction in the ED should be encouraged to pursue psychiatric follow-up.
• Many patients have spontaneous remission after outpatient psychotherapy or suggestive therapy.

Transfer

• All transfers must comply with Consolidated Omnibus Budget Reconciliation Act (COBRA)/Emergency Medical Transfer and Active Labor Act (EMTALA) regulations.

Complications

• Errors in diagnosis of conversion disorder are not uncommon. With newer diagnostic testing, instances of false-positive diagnoses of conversion disorder in which a neurological disease is later identified are around 4%.
• Recent studies have found a variety of organic diseases in patients who were initially diagnosed with conversion disorder. In one case report, a woman was seen with leg weakness and back pain who was subsequently diagnosed with sporadic Creutzfeldt-Jakob disease. Other patients with underlying psychiatric illnesses were found to have disk herniations, epidural abscesses, or cerebral hemorrhages. In another case series, 5 patients were identified as having sarcoma-induced osteomalacia, cerebellar medulloblastoma, Huntington chorea, transverse myelitis, and lower extremity dystonia. Although these case reports were rare, the initial diagnosis of conversion disorder without a complete neurologic examination, appropriate imaging, and other diagnostic testing should be discouraged.

Prognosis

• Prognostic studies differ in outcome, with recovery rates ranging from 15-74%. Factors associated with favorable outcomes are male gender, acute onset of symptoms, precipitation by a stressful event, good premorbid health, and an absence of organic or psychiatric disorder.
• Many patients with conversion reactions have spontaneous remission or demonstrate marked or complete recovery after brief psychotherapy.

MISCELLANEOUS

Section 9 of 10  

• Authors and Editors
• Introduction
• Clinical
• Differentials
• Workup
• Treatment
• Medication
• Follow-up
• Miscellaneous
• References

Medical/Legal Pitfalls

• Underlying organic disease may be present in patients with conversion disorder. Errors in diagnosis may be as much as 25%, especially with the limited time and testing available in the ED. If uncertain as to the etiology of the patient's symptoms or uncomfortable with a complicated neurologic presentation, seek appropriate neurologic and psychiatric consultation.

REFERENCES

Section 10 of 10

• Authors and Editors
• Introduction
• Clinical
• Differentials
• Workup
• Treatment
• Medication
• Follow-up
• Miscellaneous
• References

• American Psychiatric Association. Diagnostic and Statistical Manual of Mental Disorders, Fourth Edition, Text Revisions. Washington DC: APA;2000. [Full Text].
• Binzer M, Andersen PM, Kullgren G. Clinical characteristics of patients with motor disability due to conversion disorder: a prospective control group study. J Neurol Neurosurg Psychiatry. Jul 1997;63(1):83-8. [Medline].
• Binzer M, Kullgren G. Motor conversion disorder. A prospective 2- to 5-year follow-up study. Psychosomatics. Nov-Dec 1998;39(6):519-27. [Medline].
• Drake ME. Conversion hysteria and dominant hemisphere lesions. Psychosomatics. Nov-Dec 1993;34(6):524-30. [Medline].
• Dula DJ, DeNaples L. Emergency department presentation of patients with conversion disorder. Acad Emerg Med. Feb 1995;2(2):120-3. [Medline].
• Ford CV, Folks DG. Conversion disorders: an overview. Psychosomatics. May 1985;26(5):371-4, 380-3. [Medline].
• Glick TH, Workman TP, Gaufberg SV. Suspected conversion disorder: foreseeable risks and avoidable errors. Acad Emerg Med. Nov 2000;7(11):1272-7. [Medline].
• Hodgman CH. Conversion and somatization in pediatrics. Pediatr Rev. Jan 1995;16(1):29-34. [Medline].
• Kent DA, Tomasson K, Coryell W. Course and outcome of conversion and somatization disorders. A four-year follow-up. Psychosomatics. Mar-Apr 1995;36(2):138-44. [Medline].
• Lloyd GG. Acute behaviour disturbances. J Neurol Neurosurg Psychiatry. Nov 1993;56(11):1149-56. [Medline].
• Mace CJ. Hysterical conversion. I: A history. Br J Psychiatry. Sep 1992;161:369-77. [Medline].
• Mai FM. "Hysteria" in clinical neurology. Can J Neurol Sci. May 1995;22(2):101-10. [Medline].
• McCahill ME. Somatoform and related disorders: delivery of diagnosis as first step. Am Fam Physician. Jul 1995;52(1):193-204. [Medline].
• Phoebe SC, Tobiano MD, Wang HE. A case of conversion disorder presenting as a severe acute stroke. J Emerg Med. 2006;30(3):283-286. [Medline].
• Sharma P, Chaturvedi SK. Conversion disorder revisited. Acta Psychiatrica Scandinavica. 1995;92:301-304. [Medline].
• Shorter E. The borderland between neurology and history. Conversion reactions. Neurol Clin. May 1995;13(2):229-39. [Medline].
• Solvason HB, Harris B, Zeifert P, et al. Psychological versus biological clinical interpretation: a patient with prion disease. Am J Psychiatry. Apr 2002;159(4):528-37. [Medline].
• Speed J. Behavioral management of conversion disorder: retrospective study. Arch Phys Med Rehabil. Feb 1996;77(2):147-54. [Medline].
• Stone J, Smyth R, Carson A. Systematic review of misdiagnosis of conversion symptoms and "hysteria". BMJ. Oct 29 2005;331(7523):989. [Medline].
• Teasell RW, Shapiro AP. Misdiagnosis of conversion disorders. Am J Phys Med Rehabil. Mar 2002;81(3):236-40. [Medline].

Article Last Updated: Jul 17, 2006