How can the QRS Max be detected correctly when the ECG was recorded inversely?

If an ECG was recorded with swapped leads so the R-peak points downwards, the ECG Analysis Module is not able to detect the QRS max correctly. Also using the channel options "invert scale and data" won't help.

An easy solution is to use Channel calculation > Arithmetic... and multiply that channel by -1.

Tip: this can be nested with other functions like low pass filter to become: Lowpass(-1*ch1, 45) 

For further technical assistance with this or any other issue, please contact ADInstruments Technical Support by clicking HERE