title: Biventricular function during postextrasystolic potentiation in man. A study using list-mode radionuclide ventriculography.
abstract: The effects of postextrasystolic potentiation during spontaneous ventricular ectopy on both left and right ventricular function were studied in 12 patients with the aid of list-mode radionuclide ventriculography. The left ventricular ejection fraction showed a significant increase (+ 11.0 +/- 5.0%; p less than .001) with associated mild increases in end-diastolic volumes (+ 4.9 +/- 4.6; p less than .01) and significant decreases in end-systolic volumes (-13.4% +/- 7.3%; p less than .001). A more heterogeneous response was seen for the right ventricle. Right ventricular ejection increased significantly in 8/12 patients (+ 3.3 +/- 3.0%; p less than .02). Despite a large increase in end-diastolic volumes (+ 10 +/- 7.9%; p less than .001), there were only mild changes in end-systolic volumes (+ 2.2 +/- 9.0; p = NS). It is concluded that, for spontaneous ventricular ectopy in man, the increase in right ventricular ejection fraction reflects improved ventricular filling whereas the increase in left ventricular ejection fraction is linked to improved emptying.
authors: Radiology Department, Brigham and Women's Hospital, Boston, MA 02115.
authors: J F
authors: JF
authors: Polak
authors: G S
authors: GS
authors: Hirsowitz
authors: B L
authors: BL
authors: Holman
authors: P J
authors: PJ
authors: Podrid
authors: B
authors: B
authors: Lown
mesh_terms: D000328:Adult; D000368:Aged; D005117:Cardiac Complexes, Premature / Q000000981:diagnostic imaging*; D002302:Cardiac Output; D009202:Cardiomyopathies / Q000000981:diagnostic imaging; D003327:Coronary Disease / Q000000981:diagnostic imaging; D005260:Female; D006352:Heart Ventricles / Q000000981:diagnostic imaging*; D006801:Humans; D008297:Male; D008875:Middle Aged; D009200:Myocardial Contraction; D009203:Myocardial Infarction / Q000000981:diagnostic imaging; D011877:Radionuclide Imaging; D013670:Sodium Pertechnetate Tc 99m
chemical_list: D013670:Sodium Pertechnetate Tc 99m