Biomaterial Database

Comparison of triphasic waves and epileptic discharges in one patient with genetic epilepsy. 2012

Peter W Kaplan, and Dan K Schlattman

Johns Hopkins University School of Medicine, Baltimore, MD, USA. pkaplan@jhmi.edu

Genetic epilepsies with generalized spike-wave complexes (GSWCs) and encephalopathy triphasic waves (TWs) may resemble each other and have three phases per complex. Electroencephalographic (EEG) interpretation is subjective, and EEGers have noted "TWs" in cases labeled nonconvulsive status epilepticus (NCSE). Direct comparison of both wave forms under the same conditions is rarely possible. In a single patient with generalized spike waves who developed hepatic TWs, morphologic characteristics of both were compared, and it was found that GSWCs have higher frequency first, second, and third phases; steeper phase 2 slope; and briefer after-going slow waves maximal at F3 to F4. Total complex duration was approximately 0.12 seconds. The TWs had dominant high-voltage phases 2 and 3 located more posteriorly, in the frontocentral region, lasting an average of approximately 0.32 seconds. These morphologic distinctions may help differentiate TWs from GSWCs.

UI	MeSH Term	Description	Entries
D008297	Male		Males
D008875	Middle Aged	An adult aged 45 - 64 years.	Middle Age
D010507	Periodicity	The tendency of a phenomenon to recur at regular intervals; in biological systems, the recurrence of certain activities (including hormonal, cellular, neural) may be annual, seasonal, monthly, daily, or more frequently (ultradian).	Cyclicity,Rhythmicity,Biological Rhythms,Bioperiodicity,Biorhythms,Biological Rhythm,Bioperiodicities,Biorhythm,Cyclicities,Periodicities,Rhythm, Biological,Rhythmicities,Rhythms, Biological
D010641	Phenotype	The outward appearance of the individual. It is the product of interactions between genes, and between the GENOTYPE and the environment.	Phenotypes
D011237	Predictive Value of Tests	In screening and diagnostic tests, the probability that a person with a positive test is a true positive (i.e., has the disease), is referred to as the predictive value of a positive test; whereas, the predictive value of a negative test is the probability that the person with a negative test does not have the disease. Predictive value is related to the sensitivity and specificity of the test.	Negative Predictive Value,Positive Predictive Value,Predictive Value Of Test,Predictive Values Of Tests,Negative Predictive Values,Positive Predictive Values,Predictive Value, Negative,Predictive Value, Positive
D001921	Brain	The part of CENTRAL NERVOUS SYSTEM that is contained within the skull (CRANIUM). Arising from the NEURAL TUBE, the embryonic brain is comprised of three major parts including PROSENCEPHALON (the forebrain); MESENCEPHALON (the midbrain); and RHOMBENCEPHALON (the hindbrain). The developed brain consists of CEREBRUM; CEREBELLUM; and other structures in the BRAIN STEM.	Encephalon
D001931	Brain Mapping	Imaging techniques used to colocalize sites of brain functions or physiological activity with brain structures.	Brain Electrical Activity Mapping,Functional Cerebral Localization,Topographic Brain Mapping,Brain Mapping, Topographic,Functional Cerebral Localizations,Mapping, Brain,Mapping, Topographic Brain
D003937	Diagnosis, Differential	Determination of which one of two or more diseases or conditions a patient is suffering from by systematically comparing and contrasting results of diagnostic measures.	Diagnoses, Differential,Differential Diagnoses,Differential Diagnosis
D004569	Electroencephalography	Recording of electric currents developed in the brain by means of electrodes applied to the scalp, to the surface of the brain, or placed within the substance of the brain.	EEG,Electroencephalogram,Electroencephalograms
D004829	Epilepsy, Generalized	Recurrent conditions characterized by epileptic seizures which arise diffusely and simultaneously from both hemispheres of the brain. Classification is generally based upon motor manifestations of the seizure (e.g., convulsive, nonconvulsive, akinetic, atonic, etc.) or etiology (e.g., idiopathic, cryptogenic, and symptomatic). (From Mayo Clin Proc, 1996 Apr;71(4):405-14)	Convulsive Generalized Seizure Disorder,Epilepsy, Tonic,Generalized Nonconvulsive Seizure Disorder,Seizure Disorder, Generalized,Convulsive Seizure Disorder, Generalized,Epilepsy, Akinetic,Epilepsy, Atonic,Generalized Convulsive Epilepsy,Generalized Nonconvulsive Epilepsy,Generalized Onset Seizure Disorder,Generalized Seizure Disorder, Convulsive,Generalized Seizure Disorder, Nonconvulsive,Nonconvulsive Generalized Seizure Disorder,Nonconvulsive Seizure Disorder, Generalized,Seizure Disorder, Convulsive, Generalized,Seizure Disorder, Generalized Nonconvulsive,Seizure Disorder, Generalized Onset,Seizure Disorder, Generalized, Convulsive,Seizure Disorder, Nonconvulsive Generalized,Symptomatic Generalized Epilepsy,Akinetic Epilepsies,Akinetic Epilepsy,Atonic Epilepsies,Atonic Epilepsy,Convulsive Epilepsies, Generalized,Convulsive Epilepsy, Generalized,Epilepsies, Akinetic,Epilepsies, Atonic,Epilepsies, Generalized,Epilepsies, Generalized Convulsive,Epilepsies, Tonic,Epilepsy, Generalized Convulsive,Epilepsy, Generalized Nonconvulsive,Epilepsy, Symptomatic Generalized,Generalized Convulsive Epilepsies,Generalized Epilepsies,Generalized Epilepsy,Generalized Epilepsy, Symptomatic,Generalized Seizure Disorder,Generalized Seizure Disorders,Nonconvulsive Epilepsy, Generalized,Seizure Disorders, Generalized,Tonic Epilepsies,Tonic Epilepsy