Document Detail

Myocardial acceleration during isovolumic contraction as a new index of right ventricular contractile function and its relation to pulmonary regurgitation in patients after repair of tetralogy of Fallot.
MedLine Citation:
PMID:  15044866     Owner:  NLM     Status:  MEDLINE    
BACKGROUND: Myocardial acceleration during isovolumic contraction (IVA) by Doppler tissue imaging has been proposed to be a new index of right ventricular contractile function that is unaffected by ventricular shape or loading conditions. OBJECTIVES: We sought to assess the use of IVA to evaluate right ventricular contractile function. METHODS: In all, 22 pediatric patients with pulmonary regurgitation (PR) after repair of tetralogy of Fallot (TOF) (8 +/- 3 years) and 27 age-matched children were examined. The degree of PR (mild, moderate, and severe) for patients with TOF was on the basis of pulsed and color Doppler findings. Using Doppler tissue imaging, the peak myocardial velocities during early diastole, late diastole, systole, and isovolumic contraction were recorded. RESULTS: Compared with healthy children, Doppler tissue imaging velocities for patients with TOF showed decreased myocardial velocities during early diastole (P =.007), late diastole (P <.0001), systole (P <.0001), and isovolumic contraction (P <.0001). Patients with TOF had a lower IVA when compared with healthy children (P <.0001). There was a stepwise decrease in the IVA from mild to severe PR. We found a significant relationship between the IVA and the degree of PR (r = -0.86, P <.0001). CONCLUSION: The analysis of IVA allows the assessment of right ventricular contractile function for patients with repaired TOF and various degrees of PR.
Manatomo Toyono; Kenji Harada; Masamichi Tamura; Fumio Yamamoto; Goro Takada
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Publication Detail:
Type:  Comparative Study; Journal Article    
Journal Detail:
Title:  Journal of the American Society of Echocardiography : official publication of the American Society of Echocardiography     Volume:  17     ISSN:  0894-7317     ISO Abbreviation:  J Am Soc Echocardiogr     Publication Date:  2004 Apr 
Date Detail:
Created Date:  2004-03-26     Completed Date:  2004-11-08     Revised Date:  2007-11-15    
Medline Journal Info:
Nlm Unique ID:  8801388     Medline TA:  J Am Soc Echocardiogr     Country:  United States    
Other Details:
Languages:  eng     Pagination:  332-7     Citation Subset:  IM    
Department of Pediatrics, Akita University School of Medicine, Japan.
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MeSH Terms
Blood Flow Velocity / physiology
Cardiac Surgical Procedures*
Child Welfare
Child, Preschool
Coronary Circulation / physiology
Echocardiography, Doppler, Color
Echocardiography, Doppler, Pulsed
Myocardial Contraction / physiology*
Observer Variation
Postoperative Complications / etiology*,  physiopathology*,  ultrasonography
Pulmonary Valve Insufficiency / etiology*,  physiopathology*,  ultrasonography
Reproducibility of Results
Severity of Illness Index
Statistics as Topic
Tetralogy of Fallot / epidemiology,  physiopathology*,  surgery*
Treatment Outcome
Ventricular Function, Right / physiology*

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