Electrocardiograph device having additional lead function and method for obtaining additional-lead electrocardiogram

An extended lead ECG deriving method comprising:

• a first step of measuring at least certain lead potentials out of lead potentials of a 12-lead ECG;
• and
• a second step of calculating an extended lead potential, based on the lead potentials of the 12-lead ECG measured.

A method of deriving an extended lead ECG, comprising performing an arithmetic operation to calculate a lead potential at an extended lead location except for a standard 12-lead ECG, based on ECG signals measured as standard lead potentials of the standard 12-lead ECG by a potential detector comprised of ten or less electrodes.

A method of deriving an extended lead ECG, comprising, based on ECG signals measured as standard lead potentials of a standard 12-lead ECG by a potential detector comprised of ten or less electrodes, using a relationship among potentials [V], lead vectors [L], and a heart vector [H] to determine the heart vector [H] on the basis of the ECG signals as the standard lead potentials of the standard 12-lead ECG measured, and performing an arithmetic operation to calculate an extended lead potential of the extended lead ECG, using the heart vector [H] thus determined.

A method of deriving an extended lead ECG, comprising storing ECG signals measured as standard lead potentials of a standard 12-lead ECG by a potential detector comprised of ten or less electrodes, performing an arithmetic operation to set transfer coefficients α for calculation of an extended lead potential on the basis of the standard lead potentials of the standard 12-lead ECG and extended lead potentials of the extended lead ECG measured in advance, and performing an arithmetic operation to calculate the extended lead potential of the extended lead ECG from the ECG signals measured as the standard lead potentials of the standard 12-lead ECG, using the transfer coefficients α set by the arithmetic operation.

A method of deriving an extended lead ECG, comprising storing ECG signals measured as a standard 12-lead ECG by a potential detector, performing an arithmetic operation to set parameters for calculation of an extended lead ECG on the basis of lead potentials of the standard 12-lead ECG and lead potentials of the extended lead ECG measured in advance, and performing an arithmetic operation to calculate a lead potential of the extended lead ECG from the ECG signals measured as the standard 12-lead ECG, using the parameters set by the arithmetic operation.