People have asked me whether it is better to receive Reiki before or after surgery. My answer is that if you are able, do both!

Before surgery, negative energies can be removed from the body, strengthening the immune system and balancing the body’s systems, so that it will heal faster. And a big bonus is to reduce the stress or fear of surgery.
After surgery is wonderful for pain reduction, stress relief and to increase your body’s energy flow, which in turn helps you to heal faster.
Sending you Reiki during your surgery is also an option.
"When you're in the hospital and/or after you're home, I'd recommend having at least one Reiki or therapeutic touch session.
A daily treatment for the first two or three days would be ideal. Both Reiki and therapeutic touch are energy medicine treatments that are completely safe and have been shown scientifically to speed the healing process."
From: "Women’s Bodies, Women’s Wisdom
Creating Physical and Emotional Health & Healing"