Exercise and return-to-play for the adolescent and young adult cardio-oncology athlete: case study and review.

BACKGROUND: Evidence-based and/or consensus guidance regarding exercise and return-to-play for the adolescent and young adult (AYA) athlete with cardio-oncology concerns is lacking. Many of the recommendations utilized for the diagnosis, surveillance, and management of cancer therapeutic-related cardiotoxicity in children have been extrapolated from adult literature and myocarditis guidelines, the latter of which are primarily concerned with potential for arrhythmias secondary to inflammation and myocardial scarring. In addition, the athlete's heart itself brings about several diagnostic challenges including physiologic changes due to endurance or isometric training. Exercise-induced cardiac remodeling, with enlarged cavity size, lower resting ejection fraction and increased left ventricular wall thickness, depending on the type of exercise, can mimic disease states including both underlying pathologies and the response to cancer therapeutics. CASE PRESENTATION: A high school cancer survivor had borderline ejection fraction and abnormal strain indices. He was able to return to competitive sports without complication after clinical evaluation and through a shared decision-making process. CONCLUSIONS: The difficulty in differentiating physiologic from potentially pathologic echocardiographic changes can result in unnecessary disqualification, depriving athletes from social, psychological, and possibly financial benefits. Stress echocardiography indices, such as contractile reserve and mitral E/e' ratio, may inform assessment of systolic and diastolic function, respectively, and may be helpful in risk stratifying and understanding potential performance limitations in AYA athletes with cardio-oncology concerns for exercise and return-to-play. Most recent consensus statements regarding sports participation in the athlete with heart disease focus on a shared decision-making process amongst all stakeholders involved to formulate an informed, safe, and cohesive prescription to enable the athlete to safely re-engage in sports after recovering from a cardiac illness or surgery. Multidisciplinary recommendations emphasize the importance of exercise before, during, and after chemotherapy in an individualized approach to reduce risk factors in oncology patients and improve cardiovascular outcomes. Further research is needed to delineate protocols for the adolescent and young adult cardio-oncology athlete regarding exercise prescriptions and their return-to-play following oncology treatment.