Experimental study of assessment on ventricular activation origin and contraction sequence by Doppler tissue imaging.
- Author:
Ruiping JI
1
;
Xinfang WANG
;
Tsung O CHENG
;
Wangpeng LIU
;
Zhi'an LI
;
Li LIU
Author Information
1. Institute of Cardiology, Xiehe Hospital, Tongji Medical College, Huazhoong University of Science and Technology, Wuhan 430030.
- Publication Type:Journal Article
- MeSH:
Animals;
Dogs;
Echocardiography, Doppler;
instrumentation;
methods;
Heart Ventricles;
diagnostic imaging;
Myocardial Contraction;
physiology;
Sinoatrial Node;
physiology;
Tachycardia;
diagnostic imaging;
physiopathology
- From:
Journal of Huazhong University of Science and Technology (Medical Sciences)
2002;22(1):52-57
- CountryChina
- Language:English
-
Abstract:
To evaluate the possibility and accuracy of Doppler tissue image (DTI) on assessment of normal and abnormal ventricular activation and contraction sequence, 9 open chest canine hearts were analyzed by acceleration mode, M-mode, and spectrum mode DTI. Our results showed that: (1) Acceleration mode DTI could show the origin of activation and conduction sequence on line; (2) M-mode DTI revealed that the activation in mid-interventricular septum was earlier than that in mid-left ventricular posterior wall at sinus activation; (3) Spectrum DTI showed the ventricular endocardium was activated earlier than the ventricular epicardium in all segments at sinus rhythm. The earliest site of activation of the normal ventricular wall was at middle interventricular septum; the latest site was at basal-posterior wall; the contraction sequence was different at the different walls; (4) During abnormal ventricular activation, mid-left ventricular posterior wall was activated earliest in accordance with the pacing sites. Abnormal ventricular activation was slower than sinus activation, and the contraction sequence varied at different sites of ventricular wall. It is concluded that DTI can be used to localize the origin of normal or abnormal myocardial activation and to assess the contraction sequence conveniently, accurately and non-invasively.
