Usefulness of free-angle M-mode echocardiography in assessing left ventricular dimension and left ventricular systolic function |
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Authors: | Jinyao Liu Nobuaki Tanaka Sjusm Kazuya Murata Fjusum Takashi Fujino Kayo Ueda Kazumi Kimura Takuo Yamamoto Mitsuo Iwatate Takayauki Hisaoka Taketo Tanigawa Masunori Matsuzaki Sjsum |
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Institution: | (1) Second Department of Internal Medicine, Yamaguchi University School of Medicine, 1-1 Minami-Kogushi 1-chome, 755-8505 Ube-shi, Yamaguchi-ken, Japan;(2) Department of Clinical Laboratory, Yamaguchi University Hospital, 1-1 Minami-Kogushi 1-chome, 755-8505 Ube-shi, Yamaguchi-ken, Japan |
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Abstract: | Objectives To assess the usefulness of free-angle M-mode echocardiography in measuring left ventricular (LV) dimension and global systolic
function.
Background The validity of conventional M-mode echocardiography in assessing LV dimension and global systolic function is well known;
the incidental angle between the M-mode cursor and true LV minor axis diameter, however is a potential cause of measurement
error. Free-angle M-mode echocardiography may overcome the limitation of M-mode cursor arrangement in conventional M-mode
echocardiography.
Methods Thirteen normal volunteers and 10 patients in whom abnormal left ventricular wall motion was not detected by echocardiography
(mean age, 53±17 years) were enrolled in this study. Conventional and free-angle M-mode echocardiographic images of the LV
were obtained by echocardiography (ALOKA SSD-5500) using a 2.5-MHz transducer, and the LV end-diastolic (LVDd) and end-systolic
(LVDs) dimensions were measured by the leading edge method. LV end-diastolic and end-systolic volumes were calculated using
a formula by Teichholz, and the LV ejection fraction (LVEF) was obtained. Data from conventional M-mode echocardiography and
free-angle M-mode echocardiography were then compared.
Results Measurements obtained with conventional M-mode and free-angle M-mode echocaardiography were strongly correlated. Correlation
coefficients for LVDd, LVDs, and LVEF were 0.98, 0.98, and 0.96, respectively (p<0.001 in each case).
Conclusions Assessment of left ventricular dimension, and global systolic function with free-angle M-mode can be as accurate as conventional
M-mode in subjects in whom left ventricular wall motion abnormality is not detectable by echocardiogram. Moreover, when there
is improper M-mode cursor direction in conventional echocardiography, free-angle M-mode echocardiography can assess global
left ventricular systolic function more accurately and conveniently than conventional M-mode echocardiography. |
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Keywords: | left ventricular systolic function M-mode echocardiography |
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