*2.3.1.1. Upper limb SSEP*


#### *2.3.1.2. Lower limb SSEP*


The most common parameters employed for stimulation are trains between 4.18 and 7.1 Hz, with a 200–300 μs pulse width and an amplitude that is double the threshold of the motor response. In general, the amplitudes are approximately 15–30 mA, and 200–300 pulses/train is recommended. The recording will have a bandwidth of 10–1500 Hz, with the notch off, a gain of 0.1–2 μV/div and a base time of 5–10 ms/div for the upper and the lower limbs, respectively. It is very important to recall that impedances must be below 5 kΩ.

Warning criteria include increase the latency greater than 10% and/or a decrease in ampli‐ tude to less than 50% with respect to baseline.
