Assertion: chad score | /r/HasProperty | clinical prediction rules
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Source sentences:
text: The CHADS 2 score and its updated version, the CHA 2 DS 2 -VASc score, are clinical prediction rules for estimating the risk of stroke in patients with non-rheumatic atrial fibrillation (AF), a common and serious heart arrhythmia associated with thromboembolic stroke.