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In page Atrial flutter:
"Type II (atypical) atrial flutter follows a significantly different re-entry pathway to type I flutter, and is typically faster, usually 340–350 beats/minute.[1] Atypical atrial flutter rarely occurs in people who have not undergone previous heart surgery or previous catheter ablation procedures. Left atrial flutter is considered atypical and is common after incomplete left atrial ablation procedures.[2] Atypical atrial flutter originating from the right atrium and heart's septum have also been described.[citation needed]
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