Electrocardiograph with extended lead function, and extended lead electrocardiogram deriving method
AssigneeThe University of Aizu, Public University Corporation
InventorDaming WEI
Life of this patent
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Abstract
There are provided an electrocardiograph with an extended lead function and an extended lead ECG deriving method capable of easily deriving an ECG signal of an extended lead ECG by an arithmetic operation, based on ECG signals of a standard 12-lead ECG measured by a potential detector 10. An ECG memory 12 stores the ECG signals measured as the standard 12-lead ECG by the potential detector 10. An extended lead ECG calculator 16 calculates extended lead ECGs V7-V9 from the ECG signals stored in the ECG memory 12, using coefficients α representing a relationship among leads. The extended lead ECGs V7-V9 calculated are displayed through an extended lead ECG waveform outputting device 18 on a display monitor 20.
Claims7
An electrocardiograph with an extended lead function comprising:
- storage means for storing measured lead vectors L1T, LIIT, L1T-L6T, and extended lead vectors L7T-L9T, L3RT-L6RT;
- a potential detector for measuring at least certain lead potentials out of all of the lead potentials of 12-lead electrocardiogram (ECG);
- and
- extended lead potential calculating means for calculating at least an extended lead potential out of the extended lead potentials V7-V9, V3R-V6R, based on the lead potentials of the 12-lead ECG measured by the potential detector;
- wherein said extended lead potential calculating means applies the lead potentials measured by said potential detector and the measured lead vectors stored in said lead vector storage means to the following equations (1, 2) to calculate heart vectors with components hx, by and hz, and calculates said extended lead potentials based on said heart vectors and said extended lead vectors stored in said lead vector storage means:
- (
- L
- I
- T
- L
- II
- T
- L
- 1
- T
- L
- 2
- T
- L
- 3
- T
- L
- 4
- T
- L
- 5
- T
- L
- 6
- T
- )
-
- (
- hx
- hy
- hz
- )
- =
- (
- V
- I
- V
- II
- V
- 1
- V
- 2
- V
- 3
- V
- 4
- V
- 5
- V
- 6
- )
- (
- 1
- )
- wherein (T indicates transposed vector)
- L
- =
- (
- lx
- ly
- lz
- )
- (
- 2
- )
An extended lead ECG deriving method comprising the steps of:
- a first step of storing measured lead vectors L1T, LIIT, L1T-L6T, and extended lead vectors L7T-L9T, L3RT-L6RT;
- a second step of measuring at least certain lead potentials out of all of the lead potentials of the 12-lead ECG;
- and
- a third step of calculating at least an extended lead potential out of the extended lead potentials V7-V9, V3R-V6R, based on the lead potentials of the 12-lead ECG measured;
- wherein said third step applies the lead potentials and the measured lead vectors stored in said first step to the following equations (1, 2) to calculate heart vectors with components hx, by and hz,
- and calculates said extended lead potentials based on said heart vectors and said extended lead vectors stored in said first step:
- (
- L
- I
- T
- L
- II
- T
- L
- 1
- T
- L
- 2
- T
- L
- 3
- T
- L
- 4
- T
- L
- 5
- T
- L
- 6
- T
- )
-
- (
- hx
- hy
- hz
- )
- =
- (
- V
- I
- V
- II
- V
- 1
- V
- 2
- V
- 3
- V
- 4
- V
- 5
- V
- 6
- )
- (
- 1
- )
- wherein (T indicates transposed vector)
- L
- =
- (
- lx
- ly
- lz
- )
- .
- (
- 2
- )
Dependencies are inferred from the claim text.