Can I do Emsculpt session if I had Tetralogy of Fallot?

I would suggest that you see a cardiologist to get a description of all surgical procedures that you had performed related to TOF, including materials. Did you have valve placed in pulmonic valve location? Your Doctor should elaborate on current status - stable and such. This information could be requested by any provider for any service, and it would save you a lot of time to have this information. The materials used within the heart are likely not metal. But, sternal wires and such would be considered a contraindication. I suspect that you have enough conductive metal to make practitioners wary of treating you.
J Scaljon

One contraindication to Emsculpt is any metal materials. because it uses basically MRI energy which can move or change the setting of your existing metal implanted device. So probably better to find out before you move forward.

As long as you have no mechanical devices like pacemakers or metal in your heart, you should be able to have treatments. If need, check with your cardiologist first.