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Variation of parameters according to cardiac cycle length, evaluated by TDI in children

Korean Journal of Pediatrics 2009;52(3):339-345.
Published online March 15, 2009.
Variation of parameters according to cardiac cycle length, evaluated by TDI in children
Chang-Hyun Lee, Jae-Kwang Kim, Hyun-Seung Jin, Kie-Young Park, Bong-Seong Kim, Myung-Ki Han
Department of Pediatrics, Gangneung Asan Hospital, College of Medicine, Ulsan University, Gangneung, Korea
소아에서 심장 주기 시간 변화에 따른 조직 도플러 지표들의 변화양상
이창현, 김재광, 진현승, 박기영, 김봉성, 한명기
울산대학교 의과대학 강릉아산병원 소아청소년과
Correspondence: 
Myung-Ki Han, Email: hjh1052@lycos.co.kr
Abstract
Purpose
: This study aimed to determine the variation in parameters according to cardiac cycle length (CL; time interval between the QRS peaks on ECG) in children by using the conventional pulsed Doppler and tissue Doppler imaging echocardiography.
Methods
: Eighteen children with an anatomically normal heart were enrolled for the study. All children were examined by conventional and pulsed Doppler echocardiography at Gangneung Asan hospital between July 2006 and June 2007. We measured the CLs, mitral inflow velocities (E,A) and tissue Doppler imaging (TDI) parameters (s', e', a') from apical 4-chamber view. The TDI parameters were measured at the lateral (Lat) and septal (Sep) part of the mitral valve. All parameters were measured at 6 to 18 consecutive beats from each child. We then evaluated the linear correlation between CL and each parameter.
Results
: The mean age was 3.6¡¾0.5 years (M:F=8:10). There were significantly negative linear correlations between CL and A, Lat s', Lat a', Sep s', Sep e', Sep a' (P<0.01). There were significantly positive linear correlations between CL and E/A, Lat e'/a', Sep e'/a' (P<0.01). However, the E and Lat e' were not correlated with CL (P=0.229 and 0.221, respectively).
Conclusion
: This study showed that the values of the left ventricular functional parameters were changed according to CL. From our results, it is imperative to carefully examine beat-to-beat variations in children.
Key Words: Left ventricular function, Child, Echocardiography


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