Doppler Tissue Imaging Evaluation of Right Ventricular Function at Rest and During Dobutamine Infusion in Patients After Repair of Tetralogy of Fallot |
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Authors: | Sotiria C Apostolopoulou Cleo V Laskari Alexandros Tsoutsinos Spyridon Rammos |
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Institution: | (1) Department of Paediatric Cardiology, Onassis Cardiac Surgery Centre, 356 Syngrou Ave, Athens, GR, 17674, Greece |
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Abstract: | Background Reliable, non-invasive evaluation of right ventricular function, especially in congenital heart disease, is challenging.
Objectives The aim of this study was to evaluate Doppler tissue imaging (DTI) parameters of lateral tricuspid annular motion, mean rate
of pressure rise during RV contraction (mean dP/dt) and indexed right ventricular (RV) stroke volume (RVSVi) as RV function indices in repaired tetralogy of Fallot (TOF).
Methods DTI evaluation was performed in 25 repaired-TOF patients, aged 11 ± 6, at rest and during dobutamine infusion and 20 controls
at rest.
Results TOF patients had lower (P < 0.05) peak systolic velocity (Sa) (11.4 ± 4 vs. 13.7 ± 3.1 cm/s), early diastolic velocity (Ea) (11 ± 3.1 vs. 16.3 ± 3.5 cm/s)
and Sa/time from onset of QRS to Sa (Sa/Q–Sa)␣(68.8 ± 26.4 vs.␣92.3 ± 29.4 cm/s2) versus controls. Dobutamine increased (P < 0.01) Sa (11.4 ± 2.8–17.7 ± 4.7 cm/s), Ea (11 ± 3.1–15.6 ± 3.9 cm/s), late diastolic velocity (Aa) (8.4 ± 2–14.8 ± 5 cm/s),
Sa/Q–Sa (68.8 ± 26.4–17 6.8 ± 84.5 cm/s2), mean dP/dt (180 ± 74–537 ± 37 2 mmHg/s), and RVSVi (7.8 ± 3.9–11.9 ± 5.6 L/min/m2). RVSVi increase correlated (P < 0.01) with that in Sa (r = 0.6), Ea (r = 0.5), Sa/Q–Sa (r = 0.71), and mean dP/dt (r = 0.57) while mean dP/dt increase correlated strongly with Sa/Q–Sa increase (r = 0.88).
Conclusion DTI evaluation of tricuspid annular motion during dobutamine infusion in repaired TOF correlates with dP/dt and RV stroke volume and may help in assessing RV function and reserve. |
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Keywords: | Dobutamine stress echocardiography Doppler tissue imaging Right ventricular function Tetralogy of Fallot |
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