New holter monitoring analysis system: a calculation of the lead vectors.
BACKGROUND
A new system of synthesizing a 12-lead electrocardiogram (Syn-ECG) with practically identical waveforms to the standard 12-lead ECG (Stn-ECG) from 3-channel ECGs recorded by Holter monitoring has been developed.


RESULTS
The study group comprised 16 healthy individuals and 13 patients with abnormal ECGs. The bipolar eV1, eV5 and eVF leads were recorded using digital Holter monitoring and nine Syn-ECGs, corresponding to each lead of the Stn-ECG, were synthesized. The 9 ECGs consisted of a theoretical Syn-ECG and 8 Syn-ECGs positioned around the theoretical Syn-ECG at 3 cm intervals on the Frank's image surface. Of the 9 ECGs, the Syn-ECG with the maximum product of the cross-correlation coefficient of the QRS wave and that of the T wave, was automatically selected as the optimal Syn-ECG. The amplitude data from the QRS wave, R wave, T wave, and ST level, and also the amplitude ratio of the R wave, T wave to the QRS wave, were significantly well correlated between the Syn-ECG and Stn-ECG.


CONCLUSIONS
A practically identical ECG morphology, comparable with a Stn-ECG, was successfully created using this system.
Nanke
Toshihiko
T
Division of Cardiology, Department of Internal Medicine, St. Marianna University School of Medicine, Kawasaki, Japan. t2nanke@marianna-u.ac.jp
Nakazawa
Kiyoshi
K
Sakurai
Tsuneharu
T
Matsumoto
Naoki
N
Kishi
Ryouji
R
Takagi
Akihiko
A
Sato
Chuichi
C
Miyake
Fumihiko
F
Yamaki
Takashi
T
Kaneko
Mutsuo
M
D000328:Adult; D000368:Aged; D004562:Electrocardiography; D015716:Electrocardiography, Ambulatory / Q000295:instrumentation* / Q000379:methods*; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D012044:Regression Analysis; D015203:Reproducibility of Results