Not every athlete who experiences sudden cardiac arrest has warning symptoms beforehand. That fact is important. But it should not lead to the opposite mistake of ignoring symptoms when they do occur.
The purpose of preparticipation cardiovascular evaluation is to identify clues that may suggest an underlying condition before a catastrophic event. Screening is not diagnosis, and no screening strategy detects every dangerous condition.
Exertional fainting deserves attention
Fainting, or syncope, has many possible causes. Some are relatively benign. Others involve cardiovascular disease. Loss of consciousness during exertion, particularly when unexplained or associated with palpitations or chest symptoms, deserves prompt medical evaluation rather than being normalized as dehydration or overtraining.
Other symptoms can matter too
Depending on the circumstances, unexplained exertional chest discomfort, significant palpitations, unusual exercise intolerance, disproportionate shortness of breath, or recurrent unexplained dizziness may warrant assessment. Context matters: a fast heartbeat immediately after a sprint is not automatically an arrhythmia, and chest discomfort has many non-cardiac causes. Evaluation is about pattern, context, and appropriate differential diagnosis.
Family history is part of athlete history
Clinicians may ask about premature sudden death, unexplained drowning, unexplained single-vehicle crashes, cardiomyopathy, inherited arrhythmia syndromes, genetic cardiovascular disease, or relatives who required pacemakers or defibrillators at unusually young ages. These questions matter because some conditions associated with sudden cardiac arrest are inherited.
What does preparticipation screening do?
Current U.S. sports-cardiology guidance continues to emphasize a focused cardiovascular history and physical examination as the foundation of preparticipation evaluation. A positive answer does not prove dangerous heart disease. It identifies a finding that may deserve clarification.
Where does the ECG fit?
A 12-lead electrocardiogram records the heart’s electrical activity. It can identify abnormalities associated with some cardiomyopathies, channelopathies, and conduction disorders that may not be apparent from history and physical examination alone.
The 2025 AHA/ACC scientific statement says adding ECG to history and physical can be reasonable when there is appropriate expertise in athlete-specific ECG interpretation and adequate resources for follow-up. That qualification is essential. Athletic training can produce normal ECG changes that would look unusual in sedentary populations. Misinterpretation can create unnecessary anxiety, additional testing, cost, and inappropriate restriction.
Why not give every athlete every heart test?
More testing does not automatically mean better screening. Echocardiography, cardiac MRI, ambulatory rhythm monitoring, and exercise testing are valuable when clinically indicated, but are not universal screening tools for every asymptomatic athlete. Testing should answer a clinical question rather than simply accumulate data.
Screening has limits
Not every dangerous condition is detectable at the time of screening. Disease can evolve. Electrical abnormalities can be intermittent. Symptoms may develop later. Some coronary anomalies or structural conditions may not produce routine screening abnormalities. Some athletes experience cardiac arrest without recognized warning symptoms.
That is why screening and emergency preparedness are complementary rather than competing strategies. Screening tries to identify risk before an event. A practiced cardiac emergency plan is designed to support immediate lifesaving action when prevention was incomplete or impossible.
The RTH takeaway
Report meaningful symptoms truthfully. Know the family history when possible. Do not normalize unexplained exertional fainting. Seek qualified evaluation when something does not fit. And participate in sports environments that take emergency readiness seriously.
Educational note
Decisions about cardiac testing and athletic participation should be individualized by appropriately qualified health professionals. This article is not a screening protocol or clearance standard.
Sources and further reading
- Kim JH, et al. Clinical Considerations for Competitive Sports Participation for Athletes With Cardiovascular Abnormalities. AHA/ACC. 2025.
- American Heart Association. Syncope (Fainting).
- Lampert R, Rubin A. Sudden Cardiac Arrest in Athletes. 2026.
Author: Restarting The Heart | Source review: September 25, 2026
Published July 12, 2026 · Last reviewed September 25, 2026