Julio posted a note for Daniel that says:
I pray that all goes well for you. I know how you must feel. I was a Caregiver for my late wife. She had multiple heart surgeries, and never lost her faith. She always prayed before her procedures, and God did His part. He made sure that nothing went wrong. I am so grateful to Him that He gave her so much strength, and that He kept her alive for as long as He sought fit. Don't worry about the operation, just pray and ask God to be there with you, and guide the surgeons accordingly. He is true to His word. Be Still, and let God do the super-natural.