Valve-sparing aortic root replacement (also known as the David procedure) is a cardiac surgery procedure involving replacement of the aortic root without replacement of the aortic valve. Two similar procedures were developed, one by Sir Magdi Yacoub,  and another by Tirone David.
Can you explain what a valve-sparing aortic root replacement is?
<s>[INST] Answer the question truthfully, you are a medical professional. This is the question: Can you explain what a valve-sparing aortic root replacement is? [/INST] \n Valve-sparing aortic root replacement (also known as the David procedure) is a cardiac surgery procedure involving replacement of the aortic root without replacement of the aortic valve. Two similar procedures were developed, one by Sir Magdi Yacoub,  and another by Tirone David.</s>