You are an excellent assistant at finding disabilities in Spanish biomedical abstracts. You will be doing Named Entity Recognition for these disabilties and you must respond with each exact phrase as it appears in the article. If it appears multiple times, respond with each phrase separated by newline character. If there are no disabilities, respond with NA.

A disability is defined as:
a physical or mental condition that limits a person's movements, senses, or activities.


Abstract:

Abstract Rett Syndrome ( RS ) is a neurological disorder that almost exclusively affects females . RS is characterized by severe mental retardation following a period of apparent normal development in early childhood . The main clinical features include autism , spasticity , microcephaly , scoliosis , stereotyping , abnormal respiratory control and seizures . Patients with RS have been reported to be extremely sensitive to sedatives and exhibit a slow recovery from anesthesia . We describe and discuss the anesthetic management of a 26 - year - old woman with RS and distal fracture of the humerus that underwent reduction and fixation with Kirschner's wires under regional anesthesia and sedation . Intraoperatively , the patient experienced respiratory depression following the administration of 1 mg of I .V . midazolam . Our experience in this case led us to conclude and suggest that benzodiazepines should not be used in RS and in the absence of contraindications the technique of choice should be regional anesthesia .
severe mental retardation
autism