A 40-year-old male is evaluated during a routine exam. He has a history of a cardiac murmur. He is asymptomatic and activecycling 12 miles three or four times per week. Which of the following is the most appropriate next step in management for this patient?
a) Initiation of prophylactic antibiotics before dental procedures
b) Referral for echocardiography to assess the severity of the murmur
c) Initiation of beta-blocker therapy to reduce cardiac workload during exercise
d) Discharge home with reassurance and regular follow-up visits
