Professor Ulf Ziemann
Editor-in-Chief, Clinical Neurophysiology
The Editor’s Choice—
Alpha power decrease in quantitative EEG detects development of cerebral infarction after subarachnoid hemorrhage early
Clinical Neurophysiology Volume 132, Issue 6 (June 2021)
Mueller TM, Gollwitzer S, Hopfengärtner R, Rampp S, Lang JD, Stritzelberger J, Madzar D, Reindl C, Sprügel MI, Onugoren MD, Muehlen I, Kuramatsu JB, Schwab S, Huttner HB, Hamer HM (2021) Alpha power decrease in quantitative EEG detects development of cerebral infarction after subarachnoid hemorrhage early. Clinical Neurophysiology 132: 1283-1289
Delayed cerebral ischemia (DCI) is a major cause for persisting neurological deficits and poor outcome after subarachnoid hemorrhage (SAH). In clinical practice, vasospasm is routinely detected and monitored by transcranial Doppler sonography/transcranial color-coded duplex sonography (TCD/TCCS) or angiography to identify patients at risk of DCI. However, these techniques are not designed for continuous monitoring, and DCI can also develop without detection of relevant vasospasm, e.g., due to cortical spreading depression or microcirculatory dysfunction. Therefore, quantitative EEG (qEEG) may be used to detect deterioration of neuronal function due to reduced perfusion regardless of the underlying cause. Mueller et al. in this issue of Clinical Neurophysiology analyzed retrospectively 34 patients with SAH, of whom 9 developed DCI with continuous qEEG and TCD/TCCS. Patients with and without DCI significantly differed in qEEG parameters, such as maximum alpha power decrease, and summed hours of alpha power decrease, but showed no significant differences in TCD/TCCS parameters. Changes in qEEG parameters were observed earlier than changes in TCD/TCCS. Findings signify that qEEG represents a non-invasive, continuous tool to identify SAH patients at risk of cerebral infarction. This warrants further clinical trials to provide prospective evidence in larger clinical cohorts.
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2019 November Vol. 130, Issue 11 - Stability of a chronic implanted brain-computer interface in late-stage amyotrophic lateral sclerosis
2019 October Vol. 130, Issue 10 - Standards for quantification of EMG and neurography
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2019 March Vol. 130, Issue 3 - Interictal spike connectivity in human epileptic neocortex
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2018 October Vol. 129, Issue 10 - Multi-component intrinsic brain activities as a safe alternative to cortical stimulation for sensori-motor mapping in neurosurgery
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2017 November Vol. 128 Issue 11 - The standardized EEG electrode array of the IFCN
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2017 April Vol. 128 Issue 4 - Pain perception in patients with chronic disorders of consciousness: What can limbic system tell us?
2017 March Vol. 128 Issue 3 - TMS combined with EEG in genetic generalized epilepsy: A phase II diagnostic accuracy study
2017 February Vol. 128 Issue 2 - Haemodialysis alters peripheral nerve morphology in end-stage kidney disease
2017 January Vol. 128 Issue 1 - The significance of ultrasonographic carpal tunnel outlet measurements in the diagnosis of carpal tunnel syndrome
2016 December Vol. 127 Issue 12 - Motor cortical dysfunction develops in spinocerebellar ataxia type 3
2016 November Vol. 127 Issue 11 - Intraoperative spinal cord monitoring using low intensity transcranial stimulation to remove post-activation depression of the H-reflex
2016 October Vol. 127 Issue 10 - The relationship between seizures, interictal spikes and antiepileptic drugs
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