Decreased Left Ventricular Torsion and Untwisting in Children with Dilated Cardiomyopathy.
10.3346/jkms.2007.22.4.633
- Author:
Seon Mi JIN
1
;
Chung Il NOH
;
Eun Jung BAE
;
Jung Yun CHOI
;
Yong Soo YUN
Author Information
1. Department of Pediatrics, Seoul National University Children's Hospital, Seoul National University College of Medicine, SeoulKorea. ksydhnoh@yahoo.co.kr
- Publication Type:Original Article
- Keywords:
Torsion;
Rotation;
Left Ventricle;
Dilated Cardiomyopathy
- MeSH:
Adolescent;
Cardiomyopathy, Dilated/pathology/*physiopathology;
Child;
Child, Preschool;
Echocardiography, Doppler/methods;
Female;
Humans;
Infant;
Male;
Reproducibility of Results;
Ventricular Dysfunction, Left/pathology/*physiopathology
- From:Journal of Korean Medical Science
2007;22(4):633-640
- CountryRepublic of Korea
- Language:English
-
Abstract:
The purpose of this study was to analyze left ventricular (LV) torsion and untwisting, and to evaluate the correlation between torsion and other components of LV contraction in children with dilated cardiomyopathy (DCM). Segmental and global rotation, rotational rate (Vrot) were measured at three levels of LV using the twodimensional (2D) speckle tracking imaging (STI) method in 10 DCM patients (range 0.6-15 yr, median 6.5 yr, 3 females) and 17 age- and sex-matched normal controls. Global torsion was decreased in DCM (peak global torsion; 10.9+/-4.6degrees vs. 0.3+/-2.1degrees, p<0.001). Loss of LV torsion occurred mainly by the diminution of counterclockwise apical rotation and was augmented by somewhat less reduction in clockwise basal rotation. In DCM, the normal counterclockwise apical rotation was not observed, and the apical rotation about the central axis was clockwise or slightly counterclockwise (peak apical rotation; 5.9+/-4.1degrees vs. -0.9+/-3.1degrees, p<0.001). Systolic counterclockwise Vrot and early diastolic clockwise Vrot at the apical level were decreased or abolished. In DCM, decreased systolic torsion and loss of early diastolic recoil contribute to LV systolic and diastolic dysfunction. The STI method may facilitate the serial evaluation of the LV torsional behavior in clinical settings and give new biomechanical concepts for better management of patients with DCM.
