Fourier analysis of a gated blood-pool study during atrial flutter.
First-harmonic Fourier analysis of a gated blood-pool study is based on the assumption that the cardiac chambers contract once per cardiac cycle. In atrial arrhythmias this condition may not exist for the atria. We recently studied a patient with atrial flutter and 2:1 atrioventricular conduction. There were predictable alterations in the first-harmonic Fourier phase and amplitude images. The observed changes from first-harmonic Fourier analysis were: (a) very low atrial amplitude values, and (b) absence of identifiable atrial regions on the phase image.
D000368:Aged; D001282:Atrial Flutter / Q000000981:diagnostic imaging* / Q000503:physiopathology; D005260:Female; D005583:Fourier Analysis; D006325:Heart Atria / Q000000981:diagnostic imaging; D006352:Heart Ventricles / Q000000981:diagnostic imaging; D006801:Humans; D009200:Myocardial Contraction; D011877:Radionuclide Imaging