Why should raw (unprocessed) EEG be available for review during quantitative EEG monitoring?

Having raw (unprocessed) EEG available for review during quantitative EEG monitoring is critical for assisting in the identification of asymmetries or focal abnormalities. This unprocessed data provides the most direct observation of the electrical activity of the brain, allowing the clinician to see real-time patterns, waves, and any abnormal features without the alterations that can occur during processing.

Quantitative EEG often involves various forms of analysis that might obscure certain details that are evident in the raw data. For instance, one might observe a focal seizure or asymmetrical waveforms that could indicate impending complications, such as ischemia or seizure activity, which may not be as easily assessed in processed data. This capability makes raw EEG essential for accurate and timely clinical decision-making during surgical procedures, emphasizing the point that monitoring brain function is crucial for patient safety.

In cases where abnormalities are present, relying solely on processed data could lead to missed diagnoses and potentially detrimental outcomes during surgery, making the availability of unprocessed EEG vital for effective intraoperative neuromonitoring.