question: Jo-Anna 's resting heart rate is 37.....she is extremely atheltic and has never shown any symptons of shortness of breath, fatigue, etc.  she is 53 and was climbing volcanoes and scuba diving last december.  now, she is a canidate for knee surgery and apparently the hospital here in mexico is concerned because her heart rate is slow.  they are sending her to a cardiologist today  can she have surgery to repair the meniscus, knee alignment and possibly the anterior cartiledge thank you, leonel.