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  • Print publication year: 2018
  • Online publication date: May 2018

Chapter 4 - Clinical Features and the Role of Video-EEG Monitoring

from Section 1 - Recognition, Diagnosis, and Impact of Nonepileptic Seizures
1.Benbadis, SR. Differential diagnosis of epilepsy. Continuum (Minneap Minn) 2007;13:4870.
2.Benbadis, SR, O'Neill, E, Tatum, WO, Heriaud, L. Outcome of prolonged video-EEG monitoring at a typical referral epilepsy center. Epilepsia 2004;45:11501153.
3.Smith, D, Defalla, BA, Chadwick, DW. The misdiagnosis of epilepsy and the management of refractory epilepsy in a specialist clinic. QJM 1999;92:1523.
4.Scheepers, B, Clough, P, Pickles, C. The misdiagnosis of epilepsy: findings of a population study. Seizure 1998;7:403406.
5.Reuber, M, Fernandez, G, Bauer, J, Helmstaedter, C, Elger, CE. Diagnostic delay in psychogenic nonepileptic seizures. Neurology 2002;58:493495.
6.Carton, S, Thompson, PJ, Duncan, JS. Non-epileptic seizures: patients' understanding and reaction to the diagnosis and impact on outcome. Seizure 2003;12:287294.
7.Nowack, WJ. Epilepsy: a costly misdiagnosis. Clin Electroencephalogr 1997;28:225228.
8.Martin, RC, Gilliam, FG, Kilgore, M, Faught, E, Kuzniecky, R. Improved health care resource utilization following video-EEG-confirmed diagnosis of nonepileptic psychogenic seizures. Seizure 1998;7:385390.
9.LaFrance, WC Jr., Alper, K, Babcock, D, et al. Nonepileptic seizures treatment workshop summary. Epilepsy Behav 2006;8:451461.
10.Hunter, J, Jasper, HH. A method of analysis of seizure pattern and electroencephalogram: a cinematographic technique. Electroencephalogr Clin Neurophysiol 1949;1:113114.
11.Penin, H. Elektronische Patientenuberwachung in der Nervenklinik Bonn [Electronic patient monitoring in the neurologic hospital of Bonn]. Umssch Wissensch Techn 1968;7:211212.
12.Reuber, M, Jamnadas-Khoda, J, Broadhurst, M, et al. Psychogenic nonepileptic seizure manifestations reported by patients and witnesses. Epilepsia 2011;52:20282035.
13.Benbadis, SR. How many patients with pseudoseizures receive antiepileptic drugs prior to diagnosis? Eur Neurol 1999;41:114115.
14.Temkin, NR, Davis, GR. Stress as a risk factor for seizures among adults with epilepsy. Epilepsia 1984;25:450456.
15.Frucht, MM, Quigg, M, Schwaner, C, Fountain, NB. Distribution of seizure precipitants among epilepsy syndromes. Epilepsia 2000;41:15341539.
16.Benbadis, SR. A spell in the epilepsy clinic and a history of “chronic pain” or “fibromyalgia” independently predict a diagnosis of psychogenic seizures. Epilepsy Behav 2005;6:264265.
17.Benbadis, SR, Lancman, ME, King, LM, Swanson, SJ. Preictal pseudosleep: a new finding in psychogenic seizures. Neurology 1996;47:6367.
18.Thacker, K, Devinsky, O, Perrine, K, Alper, K, Luciano, D. Nonepileptic seizures during apparent sleep. Ann Neurol 1993;33:414418.
19.Duncan, R, Oto, M, Russell, AJC, Conway, P. Pseudosleep events in patients with psychogenic non-epileptic seizures: prevalence and associations. J Neurol Neurosurg Psychiatry 2004;75:10091012.
20.Gazzola, DM, Carlson, C, Rugino, A, et al. Psychogenic nonepileptic seizures and chronic pain: a retrospective case-controlled study. Epilepsy Behav 2012;25:662665.
21.Benbadis, SR. Hypergraphia and the diagnosis of psychogenic attacks. Neurology 2006;67:904.
22.Syed, TU, Arozullah, AM, Loparo, KL, et al. A self-administered screening instrument for psychogenic nonepileptic seizures. Neurology 2009;72:16461652.
23.Stone, J, LaFrance, WC Jr., Brown, R, et al. Conversion disorder: current problems and potential solutions for DSM-5. J Psychosom Res 2011;71:369376.
24.American Psychiatric Association. Diagnostic and Statistical Manual of Mental Disorders, 5th edn. (DSM-5). Washington, DC: American Psychiatric Association, 2013.
25.Davis, BJ. Predicting nonepileptic seizures utilizing seizure frequency, EEG, and response to medication. Eur Neurol 2004;51:153156.
26.Stephenson, J, Breningstall, G, Steer, C, et al. Anoxic-epileptic seizures: home video recordings of epileptic seizures induced by syncopes. Epileptic Disord 2004;6:1519.
27.Chen, DK, Graber, KD, Anderson, CT, Fisher, RS. Sensitivity and specificity of video alone versus electroencephalography alone for the diagnosis of partial seizures. Epilepsy Behav 2008;13:115118.
28.LaFrance, WC Jr., Baker, GA, Duncan, R, Goldstein, LH, Reuber, M. Minimum requirements for the diagnosis of psychogenic nonepileptic seizures: a staged approach: a report from the International League Against Epilepsy Nonepileptic Seizures Task Force. Epilepsia 2013;54:20052018.
29.Benbadis, SR, Tatum, WO, Vale, FL. When drugs don't work: an algorithmic approach to medically intractable epilepsy. Neurology 2000;55:17801784.
30.Syed, TU, LaFrance, WC Jr., Kahriman, ES, et al. Can semiology predict psychogenic nonepileptic seizures? A prospective study. Ann Neurol 2011;69:9971004.
31.Woollacott, IO, Scott, C, Fish, DR, Smith, SM, Walker, MC. When do psychogenic nonepileptic seizures occur on a video/EEG telemetry unit? Epilepsy Behav 2010;17:228235.
32.Perrin, MW, Sahoo, SK, Goodkin, HP. Latency to first psychogenic nonepileptic seizure upon admission to inpatient EEG monitoring: evidence for semiological differences. Epilepsy Behav 2010;19:3235.
33.Desai, BT, Porter, RJ, Penry, JK. Psychogenic seizures. A study of 42 attacks in six patients, with intensive monitoring. Arch Neurol 1982;39:202209.
34.Guberman, A. Psychogenic pseudoseizures in non-epileptic patients. Can J Psychiatry 1982;27:401404.
35.Meierkord, H, Will, B, Fish, D, Shorvon, S. The clinical features and prognosis of pseudoseizures diagnosed using video-EEG telemetry. Neurology 1991;41:16431646.
36.Gates, JR, Ramani, V, Whalen, S, Loewenson, R. Ictal characteristics of pseudoseizures. Arch Neurol 1985;42:11831187.
37.Gulick, TA, Spinks, IP, King, DW. Pseudoseizures: ictal phenomena. Neurology 1982;32:2430.
38.Bergen, D, Ristanovic, R. Weeping as a common element of pseudoseizures. Arch Neurol 1993;50:10591060.
39.Vossler, DG, Haltiner, AM, Schepp, SK, et al. Ictal stuttering: a sign suggestive of psychogenic nonepileptic seizures. Neurology 2004;63:516519.
40.O'Sullivan, SS, Spillane, JE, McMahon, EM, et al. Clinical characteristics and outcome of patients diagnosed with psychogenic nonepileptic seizures: a 5-year review. Epilepsy Behav 2007;11:7784.
41.Beniczky, S, Conradsen, I, Moldovan, M, et al. Quantitative analysis of surface electromyography during epileptic and nonepileptic convulsive seizures. Epilepsia 2014;55:11281134.
42.Bayly, J, Carino, J, Petrovski, S, et al. Time-frequency mapping of the rhythmic limb movements distinguishes convulsive epileptic from psychogenic nonepileptic seizures. Epilepsia 2013;54:14021408.
43.Chung, SS, Gerber, P, Kirlin, KA. Ictal eye closure is a reliable indicator for psychogenic nonepileptic seizures. Neurology 2006;66:17301731.
44.Syed, TU, Arozullah, AM, Suciu, GP, et al. Do observer and self-reports of ictal eye closure predict psychogenic nonepileptic seizures? Epilepsia 2008;49:898904.
45.Chabolla, DR, Shih, JJ. Postictal behaviors associated with psychogenic nonepileptic seizures. Epilepsy Behav 2006;9:307311.
46.Selkirk, M, Duncan, R, Oto, M, Pelosi, A. Clinical differences between patients with nonepileptic seizures who report antecedent sexual abuse and those who do not. Epilepsia 2008;49:14461450.
47.Burneo, JG, Martin, R, Powell, T, et al. Teddy bears: an observational finding in patients with non-epileptic events. Neurology 2003;61:714715.
48.Gardella, E, Rubboli, G, Tassinari, CA. Ictal grasping: prevalence and characteristics in seizures with different semiology. Epilepsia 2006;47 Suppl 5:5963.
49.Gardella, E, Rubboli, G, Tassinari, CA. Video-EEG analysis of ictal repetitive grasping in “frontal-hyperkineticseizures. Epileptic Disord 2006;8:267273.
50.Sen, A, Scott, C, Sisodiya, SM. Stertorous breathing is a reliably identified sign that helps in the differentiation of epileptic from psychogenic non-epileptic convulsions: an audit. Epilepsy Res 2007;77:6264.
51.Azar, NJ, Tayah, TF, Wang, L, Song, Y, Abou-Khalil, BW. Postictal breathing pattern distinguishes epileptic from nonepileptic convulsive seizures. Epilepsia 2007;49:132137.
52.Rosemergy, I, Frith, R, Herath, S, Walker, E. Use of postictal respiratory pattern to discriminate between convulsive psychogenic nonepileptic seizures and generalized tonic-clonic seizures. Epilepsy Behav 2013;27:8184.
53.Geyer, JD, Payne, TA, Faught, E, Drury, I. Postictal nose-rubbing in the diagnosis, lateralization, and localization of seizures. Neurology 1999;52:743745.
54.Wennberg, R. Electroclinical analysis of postictal noserubbing. Can J Neurol Sci 2000;27:131136.
55.Wennberg, R. Postictal coughing and noserubbing coexist in temporal lobe epilepsy. Neurology 2001;56:133134.
56.Elzawahry, H, Do, CS, Lin, K, Benbadis, SR. The diagnostic utility of the ictal cry. Epilepsy Behav 2010;18:306307.
57.Benbadis, SR, Wolgamuth, BR, Goren, H, Brener, S, Fouad-Tarazi, F. Value of tongue biting in the diagnosis of seizures. Arch Intern Med 1995;155:23462349.
58.Hoefnagels, WA, Padberg, GW, Overweg, J, van der Velde, EA, Roos, RA. Transient loss of consciousness: the value of the history for distinguishing seizure from syncope. J Neurol 1991;238:3943. Timary, P, Fouchet, P, Sylin, M, et al. Non-epileptic seizures: delayed diagnosis in patients presenting with electroencephalographic (EEG) or clinical signs of epileptic seizures. Seizure 2002;11:193197.
60.Brigo, F, Nardone, R, Bongiovanni, LG. Value of tongue biting in the differential diagnosis between epileptic seizures and syncope. Seizure 2012;21:568572.
61.Brigo, F, Storti, M, Lochner, P, et al. Tongue biting in epileptic seizures and psychogenic events: an evidence-based perspective. Epilepsy Behav 2012;25(2):251255.
62.Peguero, E, Abou-Khalil, B, Fakhoury, T, Mathews, G. Self-injury and incontinence in psychogenic seizures. Epilepsia 1995;36:586591.
63.Reuber, M, Pukrop, R, Bauer, J, et al. Outcome in psychogenic nonepileptic seizures: 1 to 10-year follow-up in 164 patients. Ann Neurol 2003;53:305311.
64.Trimble, MR. Non-epileptic seizures. In: Halligan, PW, Bass, CM, Marshall, JC, eds. Contemporary Approaches to the Study of Hysteria: Clinical and Theoretical Perspectives. Chapter 10. Oxford: Oxford University Press, 2001;143154.
65.Asadi-Pooya, AA, Emami, Y, Emami, M, Sperling, MR. Prolonged psychogenic nonepileptic seizures or pseudostatus. Epilepsy Behav 2014;31:304306.
66.Dworetzky, BA, Bubrick, EJ, Szaflarski, JP. Nonepileptic psychogenic status: markedly prolonged psychogenic nonepileptic seizures. Epilepsy Behav 2010;19:6568.
67.Seneviratne, U, Rajendran, D, Brusco, M, Phan, TG. How good are we at diagnosing seizures based on semiology? Epilepsia 2012;53:e6366.
68.Dhiman, V, Sinha, S, Rawat, VS, et al. Semiological characteristics of adults with psychogenic nonepileptic seizures (PNESs): an attempt towards a new classification. Epilepsy Behav 2013;27:427432.
69.Schachter, SC, Brown, F, Rowan, AJ. Provocative testing for nonepileptic seizures: attitudes and practices in the United States among American Epilepsy Society members. J Epilepsy 1996;9:249252.
70.Sumner, JW Jr., Cameron, RR, Peterson, DB. Hypnosis in differentiation of epileptic from convulsive-like seizures. Neurology 1952;2:395402.
71.Lambert, C, Rees, WL. Intravenous barbiturates in the treatment of hysteria. Br Med J 1944;2:7073.
72.Stagno, SJ, Smith, ML. Use of induction in diagnosing psychogenic seizures. J Epilepsy 1996;9:153158.
73.Walczak, TS, Williams, DT, Berten, W. Utility and reliability of placebo infusion in the evaluation of patients with seizures. Neurology 1994;44:394399.
74.Cohen, RJ, Suter, C. Hysterical seizures: suggestion as a provocative EEG test. Ann Neurol 1982;11:391395.
75.Bazil, CW, Kothari, M, Luciano, D, et al. Provocation of nonepileptic seizures by suggestion in a general seizure population. Epilepsia 1994;35:768770.
76.Slater, JD, Brown, MC, Jacobs, W, Ramsay, RE. Induction of pseudoseizures with intravenous saline placebo. Epilepsia 1995;36:580585.
77.Ribai, P, Tugendhaft, P, Legros, B. Usefulness of prolonged video-EEG monitoring and provocative procedure with saline injection for the diagnosis of non epileptic seizures of psychogenic origin. J Neurol 2006;253:328332.
78.Cohen, LM, Howard, GF, Bongar, B. Provocation of pseudoseizures by psychiatric interview during EEG and video monitoring. Int J Psychiatry Med 1992;22:131140.
79.Luther, JS, McNamara, JO, Carwile, S, Miller, P, Hope, V. Pseudoepileptic seizures: methods and video analysis to aid diagnosis. Ann Neurol 1982;12:458462.
80.Riley, TL, Berndt, T. The role of the EEG technologist in delineating pseudoseizures. Am J EEG Technol 1980;20:8996.
81.Goyal, G, Kalita, J, Misra, UK. Utility of different seizure induction protocols in psychogenic nonepileptic seizures. Epilepsy Res 2014;108:11201127.
82.Lancman, ME, Asconape, JJ, Craven, WJ, Howard, G, Penry, JK. Predictive value of induction of psychogenic seizures by suggestion. Ann Neurol 1994;35:359361.
83.Benbadis, SR. Provocative techniques should be used for the diagnosis of psychogenic nonepileptic seizures. Epilepsy Behav 2009;15:106109; discussion 115118.
84.Leeman, BA. Provocative techniques should not be used for the diagnosis of psychogenic nonepileptic seizures. Epilepsy Behav 2009;15:110114; discussion 115118.
85.Benbadis, SR, Johnson, K, Anthony, K, et al. Induction of psychogenic nonepileptic seizures without placebo. Neurology 2000;55:19041905.
86.Benbadis, SR, Siegrist, K, Tatum, WO, Heriaud, L, Anthony, K. Short-term outpatient EEG video with induction in the diagnosis of psychogenic seizures. Neurology 2004;63:17281730.
87.Varela, HL, Taylor, DS, Benbadis, SR. Short-term outpatient EEG-video monitoring with induction in a veterans administration population. J Clin Neurophysiol 2007;24:390391.
88.Bhatia, M, Sinha, PK, Jain, S, Padma, MV, Maheshwari, MC. Usefulness of short-term video EEG recording with saline induction in pseudoseizures. Acta Neurol Scand 1997;95:363366.
89.McGonigal, A, Oto, M, Russell, AJ, Greene, J, Duncan, R. Outpatient video EEG recording in the diagnosis of non-epileptic seizures: a randomised controlled trial of simple suggestion techniques. J Neurol Neurosurg Psychiatry 2002;72:549551.
90.Benbadis, SR, Tatum, WO. Overintepretation of EEGs and misdiagnosis of epilepsy. J Clin Neurophysiol 2003;20:4244.
91.Benbadis, SR, Lin, K. Errors in EEG interpretation and misdiagnosis of epilepsy. Which EEG patterns are overread? Eur Neurol 2008;59:267271.
92.Benbadis, SR. Errors in EEGs and the misdiagnosis of epilepsy: importance, causes, consequences, and proposed remedies. Epilepsy Behav 2007;11:257262.
93.Benbadis, SR. “Just like EKGs!” Should EEGs undergo a confirmatory interpretation by a clinical neurophysiologist? Neurology 2013;80:S4751.
94.Benbadis, SR, Agrawal, V, Tatum, IV WO. How many patients with psychogenic nonepileptic seizures also have epilepsy? Neurology 2001;57:915917.
95.Lesser, RP, Lueders, H, Dinner, DS. Evidence for epilepsy is rare in patients with psychogenic seizures. Neurology 1983;33:502504.
96.Reuber, M, Kral, T, Kurthen, M, Elger, CE. New-onset psychogenic seizures after intracranial neurosurgery. Acta Neurochir (Wien) 2002;144:901907.
97.Hudak, AM, Trivedi, K, Harper, CR, et al. Evaluation of seizure-like episodes in survivors of moderate and severe traumatic brain injury. J Head Trauma Rehabil 2004;19:290295.
98.LaFrance, WC Jr., Deluca, M, Machan, JT, Fava, JL. Traumatic brain injury and psychogenic nonepileptic seizures yield worse outcomes. Epilepsia 2013;54:718725.
99.Salinsky, M, Spencer, D, Boudreau, E, Ferguson, F. Psychogenic nonepileptic seizures in US veterans. Neurology 2011;77:945950.
100.Salinsky, M, Storzbach, D, Goy, E, Evrard, C. Traumatic brain injury and psychogenic seizures in veterans. J Head Trauma Rehabil 2015;30:E6570.
101.Chen, DK, Izadyar, S. Characteristics of psychogenic nonepileptic events among veterans with posttraumatic stress disorder: an association of semiology with the nature of trauma. Epilepsy Behav 2010;17:188192.
102.LaFrance, Jr., Self, JA. Do bus accidents cause nonepileptic seizures? Complex issues of medicolegal causation. J Am Acad Psychiatry Law 2008;36:227233.
103.Duncan, R, Oto, M, Martin, E, Pelosi, A. Late onset psychogenic nonepileptic attacks. Neurology 2006;66:16441647.
104.Behrouz, R, Heriaud, L, Benbadis, SR. Late-onset psychogenic nonepileptic seizures. Epilepsy Behav 2006;8:649650.
105.Davies, KG, Blumer, DP, Lobo, S, et al. De novo nonepileptic seizures after cranial surgery for epilepsy: incidence and risk factors. Epilepsy Behav 2000;1:436443.
106.Glosser, G, Roberts, D, Glosser, DS. Nonepileptic seizures after resective epilepsy surgery. Epilepsia 1999;40:17501754.
107.Ney, GC, Barr, WB, Napolitano, C, Decker, R, Schaul, N. New-onset psychogenic seizures after surgery for epilepsy. Arch Neurol 1998;55:726730.
108.Devinsky, O, Sato, S, Kufta, CV, et al. Electroencephalographic studies of simple partial seizures with subdural electrode recordings. Neurology 1989;39:527533.
109.Sperling, MR, O'Connor, MJ. Auras and subclinical seizures: characteristics and prognostic significance. Ann Neurol 1990;28:320328.
110.Driver-Dunckley, E, Stonnington, CM, Locke, DE, Noe, K. Comparison of psychogenic movement disorders and psychogenic nonepileptic seizures: is phenotype clinically important? Psychosomatics 2011;52:337345.
111.Terada, K, Ikeda, A, Van Ness, PC, et al. Presence of Bereitschaftspotential preceding psychogenic myoclonus: clinical application of jerk-locked back averaging. J Neurol Neurosurg Psychiatry 1995;58:745747.
112.Tinuper, P, Grassi, C, Bisulli, F, et al. Split-screen synchronized display. A useful video-EEG technique for studying paroxysmal phenomena. Epileptic Disord 2004;6:2730.
113.Ramsay, RE, Cohen, A, Brown, MC. Coexisting epilepsy and non-epileptic seizures. In: Rowan, AJ, Gates, JR, eds. Non-Epileptic Seizures, Chapter 6. Stoneham, MA: Butterworth-Heinemann, 1993;4754.
114.Benbadis, SR, LaFrance, WC Jr., Papandonatos, GD, et al. Interrater reliability of EEG-video monitoring. Neurology 2009;73:843846.
115.Willert, C, Spitzer, C, Kusserow, S, Runge, U. Serum neuron-specific enolase, prolactin, and creatine kinase after epileptic and psychogenic non-epileptic seizures. Acta Neurol Scand 2004;109:318323.
116.Sandstrom, SA, Anschel, DJ, Chen, DK, So, YT, Fisher, RS. Use of serum prolactin in diagnosing epileptic seizures: report of the Therapeutics and Technology Assessment Subcommittee of the American Academy of Neurology. Neurology 2006;67:544545.
117.Cragar, DE, Berry, DT, Fakhoury, TA, Cibula, JE, Schmitt, FA. Performance of patients with epilepsy or psychogenic non-epileptic seizures on four measures of effort. Clin Neuropsychol 2006;20:552566.
118.Direk, N, Kulaksizoglu, IB, Alpay, K, Gurses, C. Using personality disorders to distinguish between patients with psychogenic nonepileptic seizures and those with epileptic seizures. Epilepsy Behav 2012;23:138141.
119.Hill, SW, Gale, SD. Predicting psychogenic nonepileptic seizures with the Personality Assessment Inventory and seizure variables. Epilepsy Behav 2011;22:505510.
120.Labate, A, Cerasa, A, Mula, M, et al. Neuroanatomic correlates of psychogenic nonepileptic seizures: a cortical thickness and VBM study. Epilepsia 2012;53:377385.
121.van der Kruijs, SJ, Jagannathan, SR, Bodde, NM, et al. Resting-state networks and dissociation in psychogenic non-epileptic seizures. J Psychiatr Res 2014;54:126133.
122.Aminoff, MJ, Goodin, DS, Berg, BO, Compton, MN. Ambulatory EEG recordings in epileptic and nonepileptic children. Neurology 1988;38:558562.
123.Zaidi, A, Clough, P, Cooper, P, Scheepers, B, Fitzpatrick, AP. Misdiagnosis of epilepsy: many seizure-like attacks have a cardiovascular cause. J Am Coll Cardiol 2000;36:181184.
124.Lempert, T, Bauer, M, Schmidt, D. Syncope: a videometric analysis of 56 episodes of transient cerebral hypoxia. Ann Neurol 1994;36:233237.
125.Benbadis, SR, Chichkova, R. Psychogenic pseudosyncope: an underestimated and provable diagnosis. Epilepsy Behav 2006;9:106110.
126.Sheldon, RS, Koshman, ML, Murphy, WF. Electroencephalographic findings during presyncope and syncope induced by tilt table testing. Can J Cardiol 1998;14:811816.
127.Sheldon, R, Rose, S, Ritchie, D, et al. Historical criteria that distinguish syncope from seizures. J Am Coll Cardiol 2002;40:142148.
128.Derry, CP, Davey, M, Johns, M, et al. Distinguishing sleep disorders from seizures: diagnosing bumps in the night. Arch Neurol 2006;63:705709.
129.Iranzo, A, Santamaria, J, Rye, DB, et al. Characteristics of idiopathic REM sleep behavior disorder and that associated with MSA and PD. Neurology 2005;65:247252.
130.Montagna, P, Liguori, R, Zucconi, M, et al. Physiological hypnic myoclonus. Electroencephalogr Clin Neurophysiol 1988;70:172176.
131.Fahn, S, Williams, DT. Psychogenic dystonia. Adv Neurol 1988;50:431455.
132.Benbadis, SR, Chen, S, Melo, M. What's shaking in the ICU? The differential diagnosis of seizures in the intensive care setting. Epilepsia 2010;5:23382340.
133.Posner, JB, Saper, CB, Schiff, ND, Plum, F. Psychogenic unresponsiveness. In: Posner, JB, Saper, CB, Schiff, ND, Plum, F, eds. Plum and Posner's Diagnosis of Stupor and Coma, 4th edn, Chapter 6. New York: Oxford University Press, 2007;297308.
134.Reuber, M, Elger, CE. Psychogenic nonepileptic seizures: review and update. Epilepsy Behav 2003;4:205216.
135.LaFrance, WC Jr. Psychogenic nonepileptic seizures. Curr Opin Neurol 2008;21:195201.