Interrater variability of EEG interpretation in comatose cardiac arrest patients

The Curing Coma Campaign®: Concerns in the Indian Subcontinent

Background

The Curing Coma Campaign (CCC) was launched by the Neurocritical Care Society (NCS) in 2019, with the purpose to bring together a diverse group of coma scientists, neurointensivists, and neurorehabilitationists.

Methods

The aim of this campaign is to move beyond the limitations imposed by current definitions of coma and identify mechanisms to improve prognostication, identify test therapies, and impact outcomes. At the moment, whole approach of the CCC appears ambitiously challenging.

Results

This could be true only for the Western world, such as the North America, Europe, and few developed countries. However, the whole concept of CCC may face potential challenges in the lower-middle income countries. India has several stumbling blocks that need to and can be addressed in the future, for a meaningful outcome, as envisaged in the CCC.

Conclusion

India has several potential challenges, which we aim to discuss in this article.

How to cite this article

Kapoor I, Mahajan C, Zirpe KG, Samavedam S, Sahoo TK, Sapra H, et al. The Curing Coma Campaign®: Concerns in the Indian Subcontinent. Indian J Crit Care Med 2023;27(2):89-92.

Diagnostic accuracy between readers for identifying electrographic seizures in critically ill adults

Objective

Electrographic seizures in critically ill patients are often equivocal. In this study, we sought to determine the diagnostic accuracy of electrographic seizure annotation in adult intensive care units (ICUs) and to identify affecting factors.

Methods

To investigate diagnostic accuracy, interreader agreement (IRA) measures were derived from 5,769 unequivocal and 6,263 equivocal seizure annotations by five experienced electroencephalogram (EEG) readers after reviewing 74 days of EEGs from 50 adult ICU patients. Factors including seizure equivocality (unequivocal vs. equivocal) and laterality (generalized, partial, or bilaterally independent), cyclicity (cyclic vs. noncyclic), persistency (occurrence of status epilepticus), and patient consciousness level (coma vs. noncoma) were further investigated for their influence on IRA measures.

Results

On average, 70% of seizures marked by a reference reader overlapped, at least in part, with those marked by a test reader (any-overlap sensitivity, AO-Sn). Agreed seizure duration between reader pairs (overlap-integral sensitivity, OI-Sn) was 62%, while agreed nonseizure duration (overlap-integral specificity, OI-Sp) was 99%. A test reader would annotate one additional seizure not overlapping with a reference reader's annotation in every 11.7 h of EEG, that is, the false-positive rate (FPR) was 0.0854/h. Classifying seizure patterns into unequivocal and equivocal improved specificity and FPR (unequivocal patterns) but compromised sensitivity only for equivocal patterns. Sensitivity of all and unequivocal annotations was higher for patients with status epilepticus. Specificity was higher for partial than for bilaterally independent unequivocal seizure patterns, and lower for cyclic all seizure patterns.

Significance

Diagnosing electrographic seizures in critically ill adults is highly specific and moderately sensitive. Improved criteria for diagnosing electrographic seizures in the ICU are needed.