The medical part of this was definitely not his area of expertise, and so Tony had no answer for the lightheaded feeling he was experiencing. Maybe a slight drop in his blood pressure. And being curious about something new, Tony did what he usually did and observed closely, scooting his chair nearby so he could make notes on the reactor in the patient file as she took out the stitches.
Maybe this was where the future of Stark Industries lay. All this medical technology. He just worried about the wrong people getting hold of it. Thankfully, things stayed quiet here for the most part.