Final answer:
The nurse would suspect the 23 y/o male with Marfan's syndrome of having mitral valve prolapse.
Step-by-step explanation:
The nurse would suspect the 23 y/o male with Marfan's syndrome of having mitral valve prolapse. Mitral valve prolapse is a condition where the mitral valve in the heart bulges back into the left atrium when the heart contracts. Marfan's syndrome is a genetic disorder that can lead to problems with the connective tissue, including the heart valves.