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Let me know if the problem occurs on the connections of the AD8232 or on the other amplification stage that you added.

I can't see the complete connections for the internal opamp (Pin 10) going to your other amplification stage but can you try removing parts that could isolate this opamp including the filters and get an scope shots? I can't figure out what parts should be remove for troubleshooting since I don't get to see the complete schematic of your circuit.Check if there is an output variation when you flip the input signal. Remove R44 and put the probes of the oscilloscope between R43 and C53.using Arduino AD8232 for the high impedance and gain of the input signals. Because of this, can you do the following to verify if the problem is on the AD8232? The displayed output through the Laptop or PC shows the noise-free data which. It seems that the scope shots that you provided are not measured directly on the AD8232 pins.

It may be on the inamp, opamp or on your additional amplification stage. One of the reason that this problem may occur is when there is something on the chain that is near saturation. It seems that you have 3 stages for signal conditioning (Inamp, Opamp and other amplifcation with gain of 2) and I want to find out where the problem originates. What I mean about isolate the Inamp to the opamp is to remove the connections of the pin 19 (IAOUT) to the pin 7 (OPAMP+). ' #NEUTRAL HOLTER RECORDING# 631775c7-0 patient.Sorry for the late response.