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An M-shaped bifid notch on the ascending branch,or on the zenith,of the R wave in inferior ECG leads(II,III,aVF),so called"crochetage,"is and indicator of ostium secundum atrial septal defects.The finding of an ECG crochetage pattern may help to identify stroke patients with PFO,may help to streamline their diagnostic workup,and may warrant future studies to determine its value in stratifying stroke risk in patients with PFO. |
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