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Munich, Germany, Sunday 31 August 2008:· In competitive athletes >35 years of age with a high-risk profile for future cardiovascular events, an exercise test is mandatory to rule out/confirm the presence of (silent) underlying ischemic heart disease· For recreational sports/leisure-time activity, the exercise test today is recommended on an individual basis· Exercise tests do have proven weaknesses, showing both false positive and false negative results, making additional testing necessary, especially in uncertain cases
Sudden cardiac death (SCD) during sports activity is an uncommon, but catastrophic event. Different efforts to reduce the risk of SCD related to sports have been undertaken. What is the role of the exercise test in this context? What does a positive exercise test mean?Regular physical activity reduces cardiovascular risk factors and is associated with reduced cardiac mortality and morbidity. However, the risk for triggering cardiac events increases during vigorous physical activity, especially in individuals with underlying coronary artery disease (CAD). Several factors potentially contributing to oxygen depletion of the heart muscle (myocardial ischemia), may be specifically related to a high level of competition, such as release of stress hormones, increased risk for blood clot formation, thermal stress (heat/cold), altitude, dehydration and electrolyte disturbances.Coronary artery disease is a very uncommon cause of SCD in young athletes, where underlying (most often unknown) inherited cardiovascular abnormalities are dominating causes. But, CAD is by far the most common cause of SCD in athletes >35 years of age. To reduce the incidence of SCD related to sports, the European Society of Cardiology (ESC) has proposed recommendations for cardiac screening of competitive athletes, consisting of family and personal history (including symptoms), physical examination and 12-lead electrocardiogram (ECG). If any abnormality is found during the screening, additional testing, including often a maximal exercise test, are undertaken to rule out/confirm the presence of an underlying cardiovascular abnormality.In younger athletes (<35 years), an important indication for the exercise test clinically, is the suspicion of underlying cardiac arrhythmias and/or syncope. In athletes with underlying structural heart disease, such as hypertrophic obstructive cardiomyopathy, the exercise test may show a blood pressure drop or arrhythmias, giving important prognostic information.The main role of the exercise test in athletes, however, is for the evaluation of “master” athletes (>35 years of age) with a high-risk profile. According to the ESC, the regular use of the exercise test in asymptomatic athletes with a low-risk profile for future cardiovascular events, <35 years of age (men) and <45 years of age (women), is not recommended.But, in competitive athletes >35 years of age and with a high-risk profile for future cardiovascular events, the exercise test is mandatory to rule out/confirm the presence of (silent) underlying ischemic heart disease. For recreational sports/leisure-time activity, the exercise test today is recommended on an individual basis.Exercise tests do have proven weaknesses, showing both false positive and false negative results, making additional testing necessary, especially in uncertain cases. If CAD is confirmed, athletes should be treated according to established protocols, and evaluated regarding eligibility for future sports competition, according to international recommendations.To summarize, the exercise test is an important tool used for: cardiovascular evaluation of athletes with increased risk for underlying coronary artery disease or clinical suspicion of exercise-related arrhythmia, chest pain or syncope, or risk stratification of athletes with different known cardiac abnormalitiesA positive exercise test has to be complemented by additional testing, to confirm/exclude the presence of underlying cardiovascular abnormality. When a final diagnosis has been made, the athlete must be treated according to established protocols and evaluated for future athletic eligibility according to existing international (ESC) recommendations.
This press release accompanies both a presentation and an ESC press conference given at the ESC Congress 2008. Written by the investigator himself/herself, this press release does not necessarily reflect the opinion of the European Society of Cardiology.
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