Synonyms: waxy flexibility, flexibilitas cerea

What is catatonia?¹

Catatonia is a psychomotor syndrome reported to occur in over 10% of patients with acute psychiatric illness. Two sub-types of catatonia have been identified: retarded catatonia and excited catatonia. Retarded catatonia is characterised by immobility, mutism, staring and rigidity. Excited catatonia is less common, patients develop prolonged periods of psychomotor agitation. It is a presentation of a number of different conditions rather than a disease itself. It may be an episodic condition with periods of remission, and triggered by medication or other changes in circumstances.²

This is not an exhaustive list:

Psychiatry

• Esquizofrenia and psychosis.

• Trastorno bipolar.

• Acute stress disorder, hysteria.

• Major depression and mood disorders.

• Neuroleptic malignant syndrome.

• Pervasive developmental disorders including autismo.

• Substance intoxication and drug withdrawal.

• Anorexia nerviosa.

Neurología

• Non-convulsive status epilepticus, complex partial seizures.

• Encephalopathies.

• Cerebrovascular disease (thrombosis or haemorrhage, venous thrombosis, etc).

• Parkinsonism and dystonias.

• Tumours and other intracranial lesions (including post-surgery).

• Degenerative neurological diseases, including multiple sclerosis and Huntington's disease.

• Central pontine myelinolysis.

• Hydrocephalus.

• Head injury and locked-in syndrome.

Infección

• Meningitis and/or encephalitis.

• Neurosyphilis.

• SIDA.

• Malaria.

• Septicemia.

• Typhoid.

• Tuberculosis.

Other medical

• Enfermedad de Addison, hipopituitarismo, carcinoid tumours.

• Hipertiroidismo.

• Electrolyte imbalance, hiperparatiroidismo.

• Acute intermittent porphyria.

• Cetoacidosis diabética.

• Hepatic failure or enfermedad renal crónica.

• Lupus eritematoso sistémico.

• Hipotermia or hyperthermia.

• Thrombotic thrombocytopenic purpura.

• Poisoning (carbon monoxide, lead).

• Inherited neurometabolic disorders (homocystinuria, hereditary coproporphyria, Tay-Sachs disease, enfermedad de Wilson).

Catatonia can occur in a huge range of conditions and it is very important to identify any treatable causes - particularly psychosis, non-convulsive status epilepticus, neuroleptic malignant syndrome or encephalitis. No history will be forthcoming from the patient - but there may be relevant history from family or friends. Determine whether there is anything relevant in the medication list or past medical history to suggest a cause.

Perform a full examination. Check for a pyrexia, meningism or other signs of infection. Note whether there are any neurological signs or abnormal movements, or cogwheel rigidity (Parkinsonism). A grasp reflex may be present.³

Características clínicas¹

• Motor immobility - catalepsy (see below), waxy flexibility, rigidity, stupor (extreme hypoactivity, minimal response to stimuli, including painful ones).

• Mutism - verbally minimally responsive.

• Negativism - involuntary resistance to passive movement, or involuntary oppositional behaviour (Gegenhalten).

• Withdrawal and refusal to eat.

• Staring.

• Posturing.

There may be automatic obedience or exaggerated co-operation, combativeness, or even ambitendency (alternating co-operation and opposition). Other features include mitgehen (eg, arm raising in response to light finger pressure, despite instructions to the contrary), echopraxia, echolalia or verbigeration (repetition of phrases or sentences like a scratched record); or stereotypies (repetitive meaningless activities).

There is also an excited-delirious variety of catatonia with extreme hyperactivity (constant motor unrest or non-purposeful repetitive motor activity).³ Patients may develop hyperthermia, tachycardia, and hypertension and be in danger of collapse from exhaustion.²

The catatonia rating scale may be helpful in assessments.⁴

• FBC, U&E and creatinine, LFT, TFT, glucose, calcium, fibrin D-dimer, serum creatine kinase (usually elevated in neuroleptic malignant syndrome), serum ceruloplasmin (to detect Wilson's disease).

• Análisis de orina.

• Electroencephalogram (EEG) should readily identify a seizure disorder. Typically normal in catatonia.

• CT, MRI or positron emission tomography (PET) scan may be appropriate to exclude intracranial lesions

The patient needs admission for identification and treatment of the underlying condition, and may require enteral feeding. Catatonia is characteristically very responsive to treatment with benzodiazepines. For example, 1-2 mg lorazepam, given sublingually or intramuscularly. ECT is another highly effective treatment option.

Nota histórica

Catatonia was first described by Karl Kahlbaum in 1874. The dancer Nijinsky was apparently affected by catatonia.⁵

Catalepsy is a state characterised by a patient keeping an uncomfortable, rigid and fixed posture despite external stimulus or resistance. There may also be decreased sensitivity to pain. It is a feature seen in catatonia (see above).