Subcostal M-mode echocardiography of atrial septum for diagnosis of atrial flutter.
D000368:Aged; D001282:Atrial Flutter / Q000175:diagnosis* / Q000503:physiopathology; D004452:Echocardiography; D006325:Heart Atria / Q000503:physiopathology*; D006801:Humans; D008297:Male