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ID 113954
Title Alternative
Temporal Sequence of RV Free Wall Contraction
Author
Ono, Akemi University of Tokushima
Homma, Yukako University of Tokushima
Keywords
Children
Right ventricle
Speckle tracking
Tissue Doppler imaging
Content Type
Journal Article
Description
Background: The temporal sequence of right ventricular (RV) deformation is related to RV dysfunction. The sequence of RV free wall contraction was investigated.
Methods and Results: In this prospective study, strain profiles using speckle-tracking echocardiography and tissue Doppler-derived pulmonary and tricuspid annular motion were assessed in 60 normal children. Circumferential RV free wall strain of 3 individual segments (anterior, lateral, and inferior) was evaluated. Longitudinal strain was assessed in 3 individual segments (RV outflow tract [RVOT], apical, and RV inflow tract [RVIT]). The isovolumetric contraction time (ICT) and the time interval between the onset of the QRS wave to the peak s’ wave were measured for pulmonary and tricuspid annular motion velocities. The time to peak circumferential strain was significantly lower in the anterior than in the lateral and inferior segments (339.1±19.5, 358.3±21.8, and 366.6±22.4 ms, respectively; P<0.0001). Longitudinal deformation of the RVOT segment occurred before the apical and RVIT segments (351.8±23.1, 366.3±20.1, and 369.2±21.3 ms, respectively; P<0.0001). The ICT and the time to peak s’ were significantly shorter in pulmonary than in tricuspid annular motion (49.4±10.1 vs 58.0±13.2 ms; and 104.7±12.2 vs. 160.5±27.1 ms; P<0.0001 for each).
Conclusions: Longitudinal deformation of RVOT precedes RVIT. Circumferential deformation occurs in the anterior segment before the lateral and posterior segments. The presence of mechanical time heterogeneity appears important for RV performance.
Journal Title
Circulation Journal
ISSN
13469843
13474820
NCID
AA11591968
Publisher
The Japanese Circulation Society
Volume
81
Issue
11
Start Page
1699
End Page
1706
Published Date
2017-10-25
EDB ID
DOI (Published Version)
URL ( Publisher's Version )
FullText File
language
eng
TextVersion
Publisher
departments
Medical Sciences