Identification of stimulation site of pacemaker lead using tissue tracking method.
OBJECTIVE
We aimed to identify the electrical stimulation sites of pacemaker leads using a tissue tracking method of tissue Doppler imaging.


METHODS
The study group consisted of 30 patients who had undergone permanent pacemaker implantation. During tissue Doppler imaging, the initial contraction site was seen as a red area stimulated by the pacemaker lead. This red area was analyzed precisely using time-distance curves generated by tissue tracking.


RESULTS
The initial contraction site of the myocardium was located in the interventricular septum in seven patients and in the apical portion of the right ventricle in 11 patients. Furthermore, analysis of time-distance curves demonstrated that one point within the red area started to move earlier than the others.


CONCLUSIONS
The site of electrical stimulation within the myocardium can be determined from the time-distance curves generated by the tissue tracking method.
Department of Cardiology, Koshigaya Hospital, Dokkyo University School of Medicine, 2-1-50 Minami-Koshigaya, Koshigaya, Saitama, 343-8555, Japan. sayuki@dokkyomed.ac.jp.
Sayuki
S
Kobayashi
Department of Cardiology, Koshigaya Hospital, Dokkyo University School of Medicine, 2-1-50 Minami-Koshigaya, Koshigaya, Saitama, 343-8555, Japan.
Terumi
T
Hayashi
Department of Cardiology, Koshigaya Hospital, Dokkyo University School of Medicine, 2-1-50 Minami-Koshigaya, Koshigaya, Saitama, 343-8555, Japan.
Kaori
K
Akiya
Department of Cardiology, Koshigaya Hospital, Dokkyo University School of Medicine, 2-1-50 Minami-Koshigaya, Koshigaya, Saitama, 343-8555, Japan.
Michiko
M
Ichihara
Department of Cardiology, Koshigaya Hospital, Dokkyo University School of Medicine, 2-1-50 Minami-Koshigaya, Koshigaya, Saitama, 343-8555, Japan.
Michiko
M
Minai
Department of Cardiology, Koshigaya Hospital, Dokkyo University School of Medicine, 2-1-50 Minami-Koshigaya, Koshigaya, Saitama, 343-8555, Japan.
Yoshihiko
Y
Sakai
Department of Cardiology, Koshigaya Hospital, Dokkyo University School of Medicine, 2-1-50 Minami-Koshigaya, Koshigaya, Saitama, 343-8555, Japan.
Kan
K
Takayanagi
echocardiography; pacemaker; time–distance curve; tissue Doppler imaging; tissue tracking