Objective: To investigate the clinical importance of intermittent rhythmic delta activity (IRDA) in terms of accompanying electrophysiological findings on EEG and their association with IRDA.
Methods: We retrospectively assessed all EEG studies recorded in our institution from 2011 to 2017. Patients with intermittent rhythmic delta activity (IRDA) in EEGs were included. Clinical data were collected from charts of the patients with IRDA.
Results: We identified 69 EEGs with IRDA in 58 patients from a total of 18,625 EEG recordings. The most common IRDA type was frontal IRDA (FIRDA; 55%), followed by temporal IRDA (TIRDA; 28.9%). Unilateral (UL) distribution was present in 36.8% of FIRDAs and 95% of TIRDAs. The frequency of focal epileptiform discharges (FED) was 78.5% in UL FIRDA group and 89.4% in UL TIRDA group. Among the EEGs with FEDs, in UL FIRDA group 90.9% and in UL TIRDA group 70.5% of the FEDs were ipsilateral. Concordance of focal structural brain lesions and FEDs with UL TIRDA was 30.7%, and with UL FIRDA was 50%. UL FIRDA had a 71.4% positive predictive value for ipsilateral focal epileptic focus and UL TIRDA had 63.1%. The frequency of focal structural lesions and FEDs were significantly higher in the UL FIRDA group than bilateral FIRDA group (P=0.03; P=0.01). Among the patients with focal structural lesions, ipsilateral FED association is significantly higher in the UL FIRDA group than BL FIRDA group (P=0.03).
Conclusions: UL FIRDA is more likely to indicate a focal lesion and a focal epileptic focus compared to bilateral FIRDA, and it had similar characteristics to UL TIRDA. It can be considered that UL FIRDA has as good a lateralizing value for ipsilateral focal epileptic focus and focal lesion as UL TIRDA.
Download full-text PDF |
Source |
|---|---|
| http://dx.doi.org/10.1016/j.neucli.2019.01.036 | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
Electroencephalographic compatibility with fitness to drive: A nationwide survey among Swiss neurologists.
Epilepsia Open
December 2024
Department of Neurology, University Hospital Basel, Basel, Switzerland.
Article Synopsis
- The Swiss guidelines for driving with epilepsy require EEG findings to be compatible with fitness to drive (FTD), but they lack specific criteria, prompting a nationwide survey to assess how neurologists apply this in practice.
- In the survey, 102 neurologists reported variances in their assessment of EEG results, notably regarding normal variants and certain pathological patterns, revealing significant disagreement on evaluating FTD.
- The findings highlight the need for more standardized criteria and additional research, as many participants supported the inclusion of EEG results in FTD assessments but noted that follow-up tests like reaction-time evaluations were infrequently conducted.
An In Vitro Study of Chitosan-Coated Bovine Pericardium as a Dural Substitute Candidate.
J Funct Biomater
September 2023
Biomedical Engineering Study Program, Department of Physic, Faculty of Science and Technology, Universitas Airlangga, Surabaya 60115, Indonesia.
Defects in the dura matter can be caused by head injury, and many cases require neurosurgeons to use artificial dura matter. Bovine pericardium is an option due to its abundant availability, adjustable size and characteristics, and because it has more collagen than porcine or equine pericardia. Nevertheless, the drawback of bovine pericardium is that it has a higher inflammatory effect than other synthetic dura matters.
View Article and Find Full Text PDFPost-Traumatic Atlanto-Axial Instability: A Combined Clinical and Radiological Approach for the Diagnosis of Pathological Rotational Movement in the Upper Cervical Spine.
J Clin Med
February 2023
CAPHRI School for Public Health and Primary Care, Faculty of Health, Medicine, and Life Sciences, Maastricht University, 6211 LM Maastricht, The Netherlands.
Post-traumatic rotational instability at the atlanto-axial (C1-2) joint is difficult to assess, much less quantify, due to the orientation and motion plane of the joint. Prior investigations have demonstrated that a dynamic axial CT scan, during which the patient maximally rotates the head right and left, can be used to evaluate and quantify the amount of residual overlap between the inferior articulating facet of C1 and the superior facet of C2, as an index of ligamentous laxity at the joint. We have previously demonstrated that a novel orthopedic test of rotational instability, the atlas-axis rotational test (A-ART), may have utility in identifying patients with imaging evidence of upper cervical ligament injury.
View Article and Find Full Text PDFFIRDA, refractory epilepsy, and SEEG-guided RF: A case report.
Epilepsia Open
June 2023
Assuta Medical Center, Functional Neurosurgerie Group, Tel Aviv, Israel.
Objectives: We will demonstrate that FIRDA (frontal intermittent rhythmic delta activity)-otherwise related to systemic disorders and encephalopathy-has a role as an epileptic biomarker of deep-seated midline SOZ. Its abolishment following SEEG-guided radiofrequency of such SOZ correlates with clinical improvement suggesting its role as a noninvasive biomarker of otherwise inaccessible SOZs.
Methods: We report the case of AK who was admitted with "psychiatric and gastrointestinal complaints.
Clinical correlates and electroencephalographic features of FIRDA in a tertiary center.
Acta Neurol Scand
December 2019
Sackler Faculty of Medicine, Tel-Aviv University, Tel-Aviv, Israel.
Objectives: We aimed to explore the diagnostic value, clinical correlates and electroencephalographic features of FIRDA (Frontal intermittent rhythmic delta activity).
Materials And Methods: We retrospectively reviewed reports from EEG studies done in adults at our tertiary center between January 2015 and May 2018. For cases demonstrating FIRDA, medical files were reviewed and each case was given a diagnostic category.
Want AI Summaries of new PubMed Abstracts delivered to your In-box?
Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!