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lüll PLEDs: clinical correlates Fitzpatrick W; Lowry NCan J Neurol Sci 2007[Nov]; 34 (4): 443-50OBJECTIVE: We reviewed our experience in 96 consecutive patients exhibiting periodic lateralized epileptiform discharges (PLEDs) on EEG. METHODS: EEG reports from January 1, 1999 to September 30, 2006 were screened for the term 'PLEDs' and its variants. A retrospective chart review, including examination of neuroimaging and other investigations, was conducted on each patient identified. RESULTS: Acute stroke, tumor and central nervous system infection were the most common etiologies, accounting for 26%, 12% and 12% of cases respectively. Acute hemorrhage and traumatic brain injury combined accounted for another 12%. Previously unreported etiologies included posterior reversible encephalopathy syndrome (PRES), familial hemiplegic migraine and cerebral amyloidosis. There were 9 cases of chronic PLEDs attributable to underlying cortical dysplasia or severe remote cerebral injury, all with an accompanying partial seizure disorder. A prominent role for alcohol withdrawal was noted, and in 6 cases was the sole etiological factor. Fever was present as a potential contributing factor in 40% of cases, and significant metabolic abnormalities in 35%. Seizure activity occurred in 85% of patients overall, but in 100% of patients with PLEDs Plus and BiPLEDs Plus. The overall mortality rate was 27%. Mortality among patients with BiPLEDs however was almost twice that, at 52%. CONCLUSIONS: This case series demonstrates the wide variety of potential PLED etiologies. It also emphasizes that despite advances in neurocritical care, the morbidity and mortality associated with PLEDs has changed little since their recognition four decades ago.|Adolescent[MESH]|Adult[MESH]|Aged[MESH]|Aged, 80 and over[MESH]|Alcohol Withdrawal Seizures[MESH]|Brain Injuries/complications[MESH]|Brain Neoplasms/complications[MESH]|Brain/*physiopathology[MESH]|Central Nervous System Infections/complications[MESH]|Cerebral Hemorrhage/complications[MESH]|Child[MESH]|Child, Preschool[MESH]|Electroencephalography[MESH]|Female[MESH]|Humans[MESH]|Infant[MESH]|Male[MESH]|Middle Aged[MESH]|Retrospective Studies[MESH]|Seizures/*etiology/*mortality/*physiopathology[MESH]|Stroke/complications[MESH] |