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Current P SYCHIATRY Current p SYCHIATRY CASES THAT TEST YOUR SKILLS Sleepwalking and nightmares have troubled Ms. J since childhood. Her “walks” have led to disrupted sleep, a fractured foot, and the threat of serious injury. Is this a parasomnia? Night terrors: a family affair Lisa M. Cantor, MD Roy H. Jacobson, MD Robert M. Cantor, MD Adjunct assistant professor Assistant professor Associate professor of family medicine of family medicine of radiology Department of family medicine University of Cincinnati College of Medicine HISTORY Terrors at age 8 specialist diagnosed Ms. J as having night terrors and s. J, age 35, began having sleepwalking prescribed clonazepam, 0.5 mg nightly. The agent did M episodes at age 8. At times they involved odd not prevent the events, but their frequency returned to behaviors, such as carrying her brother’s shirt into baseline after Ms. J took her exam. the bathroom, placing it into the sink, and turning on the water. Were Ms. J’s clinical presentation and course As a child, Ms. J also began experiencing noc- consistent with night terrors? How would turnal awakenings characterized by panic and you treat her symptoms at this point? shouting. She sometimes saw a frightening image, usually of something falling on her. She would ▼ promptly return to sleep after each incident and had trouble remembering the event the next morn- ing. The sleepwalking and awakening occurred monthly—more often when she was under stress or fatigued—until her early 20s. At age 21, Ms. J. was under severe stress while preparing for a crucial graduate school exami- nation and was losing much sleep. At this point, the The authors’ observations episodes began to occur once or twice nightly. Night terrors are an arousal disorder that usual- She consulted a sleep specialist. EEG results ly begins in early childhood and affects 1% to 4% were normal, but a sleep study was not helpful of the population.1 The disorder usually disap- because she experienced no events that night. The pears before puberty. VOL. 3, NO. 2 / FEBRUARY 2004 65 CASES THAT TEST YOUR SKILLS Night terrors: a family affair Episodes of this parasomnia typically occur jumped out of bed and fractured her foot. In anoth- one to four times each month and can last sever- er, she jumped from the bed and ran headfirst into a al minutes. They are characterized by sudden wall, causing bruising but no severe injury. awakenings with panic, disorientation, vocaliza- Each event was accompanied by confusion for tion, and autonomic discharge. Patients some- 10 seconds to 3 minutes. Ms. J remembered about times see a frightening image. The events occur one-half the events; her husband described the in stage 4 sleep, usually soon after falling asleep. remainder. She invariably returned to sleep immedi- Disorientation and a prompt return to sleep may ately after each event. follow.2 Sleeptalking and sleepwalking may also A second sleep specialist diagnosed Ms. J as be present. The patient often cannot remember having night terrors. Unsatisfied with the diagnosis, the event the next morning. she consulted a neurologist who specialized in At this point, night terrors are a reasonable epilepsy. The neurologist diagnosed her as having explanation for Ms. J’s nocturnal phenomena. nocturnal frontal lobe epilepsy (NFLE) based on her Benzodiazepines, especially clonazepam, have history. A video EEG study—which showed spike been shown to decrease night terror frequency.3 and wave activity in the left frontal lobe during the nocturnal events—confirmed the diagnosis. The CONTINUED HISTORY A new mother’s stress events all occurred during stage 2 sleep. t age 34, Ms. J gave birth to her first child. A Weeks later, the nocturnal events began to Is Ms. J’s latest diagnosis on target? Which occur at least three times nightly—every hour on clinical features in her case would differentiate some nights. Because their frequency disrupted sleep epilepsy from parasomnias? her sleep, Ms. J constantly felt tired. Stress, emotional upset, and sleep deprivation exacerbat- ▼ ed the events, which were stereotypical and included: • sudden jerking of the right upper and/or lower extremities • sudden sitting up and posing with the right arm flexed and internally rotated • hallucinations of spiders or people • sudden body flexion accompanied by an The authors’ observations “electric shock” sensation in the head Frontal lobe epilepsy can take many forms. • sitting up in bed, touching and picking at the Seizures can occur during sleep and/or while sheets awake and consist of sudden, brief (<1 minute) • nonsensical speech after sitting up in bed motor attacks occurring in clusters. The preva- • sudden fear that Ms. J’s baby was hurt or lence of sleep epilepsy among persons with dead, accompanied by searching the bed and seizure disorders has been estimated at 7.5% to under the pillow for the baby 45%, based on studies of small patient • episodes of panic often accompanied by cry- populations.4 ing out, jumping out of bed and—in some Nocturnal frontal lobe seizures: cases—running. • occur only in non-REM (usually stage 2) Several times she ran down the stairs and out of sleep. the house while asleep. During one event, she • can occur at any time of night continued on page 70 66 Current VOL. 3, NO. 2 / FEBRUARY 2004 p SYCHIATRY CASES THAT TEST YOUR SKILLS Night terrors: a family affair continued from page 66 Table Characteristics of parasomnias and nocturnal epilepsy Nightmare (adult) Night terror Nocturnal epilepsy Incidence 5 to 10% 1 to 3% Unknown Sleep stage During REM Stage 4 Often stage 2 Anytime during In first few hours Anytime during the night the night of sleep Age of onset Variable Early childhood Late childhood or adolescence Occasionally in adulthood Change Often diminishes Diminishes with age Heterogeneous course with age with age Gone by young May be less severe later in life May remit and recur adulthood Symptoms Frightening dreams Inconsolable terror With or without fear and autonomic Detailed story line Not associated with activation No motor activity dream Hallucinations or illusions possible No injury Low-level motor activity Stereotypical, paroxysmal motor Autonomic activation activity Injury rare Injury possible Sleep Often delayed Usually rapid Usually rapid resumption Precipitating PTSD PTSD Sleep deprivation factors Unusual stressors Sleep deprivation Physical and emotional stressors Frequency Irregular 1 to 2 times per Extremely variable month or less Can occur in clusters Recollection Variable Often none Variable PTSD: Posttraumatic stress disorder • usually begin in middle childhood to early • sensory phenomena such as illusions and adolescence, but onset in early childhood or hallucinations, sensations of buzzing, vibration, adulthood has been reported.5 Seizures usually and olfactory or gustatory sensations subside during adulthood (Table).6 • aphasia or other vocal events, such as These seizures are clinically polymorphous laughing, screaming, or making odd noises but stereotypical in each patient. Seizure type • fear and autonomic discharge simulating varies depending on which frontal lobe region is a night terror or panic attack.7 affected. Confusion also is possible, although Nocturnal seizures universally have an explo- consciousness many times is preserved through sive onset, with motor symptoms such as jerking, the episode. rocking, pelvic thrusting, tonic posturing, kicking, As with other seizures, sleep disruption exac- scrambling about, and touching the bed with one’s erbates NFLE. Most patients have a normal hand. Other possible occurrences include: interictal EEG. 70 Current VOL. 3, NO. 2 / FEBRUARY 2004 p SYCHIATRY Current p SYCHIATRY Because NFLE is often misdiagnosed as a Jewish. No literature describes the disorder in this parasomnia, the psychiatrist needs to consider population or these locations. this disorder in the differential diagnosis. Any ADNFLE was the first genetic epilepsy to be patient with a suspected parasomnia should be associated with a defect in a single gene. It was evaluated by a neurologist for NFLE if: recognized as a disorder in 1994, having previ- • the nocturnal events have not ceased by ously been described with different names by young adulthood multiple authors. • events consist of prominent stereotypical The disorder is a “channelopathy,” signify- motor symptoms that occur in clusters and/or ing a defective ion channel resulting in abnor- have caused physical injury. mal neuronal cell membrane conduction. The affected gene is the acetylcholine receptor, EXTENDED HISTORY Family stories which is widely distributed in the brain. s. J’s neurologist asked whether any relatives Missense mutations of the receptor gene lead to M have experienced similar nocturnal events. a change in an amino acid found in the center of Upon talking with family members, she the receptor pore. Ordinarily, the centers of ion learned that her aunt (her father’s sister) experi- channel pores are lined with hydrophobic amino enced nocturnal hallucinations and panic episodes acids to facilitate entrance of ions. The muta- well into her 50s. Her first cousin (her aunt’s tions in affected individuals result in a daughter) also has nocturnal hallucinations and hydrophobic amino acid substitution. Different panic episodes and runs in her sleep. Two of her families display different mutations of the father’s cousins—twin brothers—were also affect- gene.10 ed. One of the brothers experienced explosive In ADNFLE, there is mutation in the second episodes, sometimes assaulting the other brother transmembrane region of the alpha-4 subunit of while asleep; he once had to be restrained from the neuronal acetylcholine receptor. Defective jumping out a window. receptors result in reduced channel permeability Other family members or surviving spouses to calcium, causing fast desensitization and described similar events that are clinically consis- receptor hypoactivity. This has been postulated to tent with frontal lobe seizures. Interestingly, tic dis- cause an imbalance in excitatory/inhibitory orders run in the same branches of the family as synaptic transmission.11 Further study will eluci- the seizures.
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