What is the recommended impedance range for a scalp electrode during intraoperative EEG recording?

The recommended impedance range for a scalp electrode during intraoperative EEG recording is typically between 1,000 - 5,000 ohms. This range ensures that the electrodes have good enough contact with the scalp to obtain reliable EEG signals while minimizing the effects of electrical noise and artifacts.

When impedance is kept within this range, it facilitates a balance between signal quality and the amount of electrical resistance presented by the scalp and electrode interface. Electrode impedances that are too low can increase the risk of electrical interference and distortion in the recordings, while very high impedances can lead to excessively weak signals and may not allow for adequate response to neural activity. Therefore, maintaining impedance within the 1,000 - 5,000 ohm range is critical for optimal intraoperative monitoring and ensuring clear and interpretable EEG data during surgical procedures.