Stick-On sensor could replace painful blood tests after heart surgery

This study is testing a new, painless skin sensor that measures a substance called lactate, which can indicate how well the body is recovering after major heart surgery. Researchers want to see if the sensor's readings are as accurate as the standard method, which requires frequent blood draws from an artery or vein. If it works, this sensor could make recovery more comfortable by reducing the need for so many needle sticks and could help doctors monitor patients more easily in the future.