Method for deriving standard 12-lead electrocardiogram, and monitoring apparatus using the same

A monitoring apparatus for deriving a standard 12-lead electrocardiogram, comprising:

• four first electrodes, adapted to be attached to positions of the living body in the vicinity of a lower right end of a right clavicle, the vicinity of a lower left end of a left clavicle, the vicinity of a position on a right anterior axillary line at the level of a right lowermost rib, and the vicinity of a position on a left anterior axillary line at the level of a left lowermost rib of a living body, so as to correspond to limb leads of the standard 12-lead electrocardiogram;
• two second electrodes, adapted to be attached to positions of the living body that correspond to a lead V2 and a lead V4 of chest leads of the standard 12-lead electrocardiogram;
• a first detector, operable to measure a first electrocardiogram data set corresponding to a lead I and a lead II of the standard 12-lead electrocardiogram with the first electrodes;
• a second detector, operable to measure a second electrocardiogram data set including the lead V2 and the lead V4 with the second electrodes;
• a first calculator, operable to calculate an instantaneous electromotive force vector (a heart vector) based on the first electrocardiogram data set, the second electrocardiogram data set, and predetermined first lead vectors of the lead I, the lead II, the lead V2 and the lead V4;
• a second calculator, operable to calculate a third electrocardiogram data set including a lead V1, a lead V3, a lead V5 and a lead V6 of the chest leads based on the heart cardiac vector and predetermined second lead vectors of the lead V1, the lead V3, the lead V5 and the lead V6;
• a third calculator, operable to calculate a fourth electrocardiogram data set corresponding to a lead III, a lead aVR, a lead aVL and a lead aVF of the standard 12-lead electrocardiogram based on the first electrocardiogram data set;
• and
• a display, operable to display the standard 12-lead electrocardiogram based on the first electrocardiogram data set, the second electrocardiogram data set, the third electrocardiogram data set and the fourth electrocardiogram data set.