According to the 2016 ACNS Guidelines, what is the recommended CMRR threshold?

The recommended Common-Mode Rejection Ratio (CMRR) threshold according to the 2016 ACNS Guidelines is set at 90 dB. CMRR is a critical specification in the performance of differential amplifiers used in electrophysiology, as it quantifies the ability of the amplifier to reject common-mode signals—those signals that appear equally on both inputs—while amplifying the differential signals, which represent the relevant physiological activity being monitored.

A CMRR of 90 dB indicates a very high level of rejection of common noise and interference, which is essential for ensuring the clarity and accuracy of the recorded bio-signals. This level of CMRR helps mitigate the effects of electrical noise that can be present in clinical settings, thereby allowing for improved signal fidelity and reliability in electrodiagnostic testing.

Therefore, the 90 dB threshold aligns with best practices for ensuring high-quality recordings and maintaining the integrity of neurophysiological measurements, making this the correct standard per the ACNS guidelines.