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Types of Atrial Flutter and Macroreentrant Atrial Tachycardia The typical, reverse typical, and the lower-loop flutter all have the low right atrial isthmus incorporated in the flutter circuit. Other macroreentrant flutters include scar-mediated reentrant tachycardia and left mitral isthmus flutter. Modified with permission from Wellens et al.3 Copyright 2002 American Heart Association, Inc.
Fl indicates flutter; LA, left atrium; and MRT, macroreentrent.
