Pulse discrimination device and electrocardiogram analyzer

1. A pulse discrimination device configured to receive electrical signals from a plurality of positions of a living body to which a pacing device for outputting a pacing pulse to cause a heart to beat is attached, the pulse discrimination device comprising:

at least one processor and memory configured to:

calculate a difference of the electrical signals received from the plurality of positions;

calculate a sum of the electrical signals received from the plurality of positions;

detect the pacing pulse included in the electrical signals by comparing the calculated difference and the calculated sum; and

discriminate the detected pacing pulse from an electrocardiogram signal, wherein the electrical signals comprise the pacing pulse and the electrocardiogram signal.

2. The pulse discrimination device according to claim 1 , wherein the at least one processor and memory are further configured to:

hold a peak value of an absolute value of the calculated difference as a difference peak value, and to hold a peak value of an absolute value of the calculated sum as a sum peak value, and

determine that the electrical signals received from the plurality of positions are the pacing pulse, in a case where the held difference peak value is equal to or larger than the held sum peak value.

3. The pulse discrimination device according to claim 2 , further comprising:

a first timer configured to measure a hold time of the difference peak value and the sum peak value,

wherein the at least one processor and memory are further configured to clear the held difference peak value and the held sum peak value, in a case where the hold time of the first timer reaches a pulse time predetermined based on a time of a pulse width of the pacing pulse.

4. The pulse discrimination device according to claim 3 , wherein the pulse time is larger than the time of the pulse width of the pacing pulse.

5. The pulse discrimination device according to claim 1 , wherein the at least one processor and memory are configured to determine that the electrical signals received from the plurality of positions are the pacing pulse, in a case where an absolute value of the difference is equal to or larger than an absolute value of the sum.

6. The pulse discrimination device according to claim 1 , wherein the at least one processor and memory are further configured to:

acquire a pulse width of the electrical signals received from the plurality of positions based on variation in an intensity of the electrical signals, and

discriminate the pacing pulse further based on the acquired pulse width.

7. The pulse discrimination device according to claim 6 ,

wherein the at least one processor and memory are further configured to detect a rise and a fall of the electrical signals received from the plurality of positions,

wherein the pulse discrimination device further comprises a second timer configured to measure a time between the detected rise and the detected fall, and

wherein the at least one processor and memory are further configured to acquire the time between the rise and the fall, which is measured by the second timer as the pulse width.

8. The pulse discrimination device according to claim 7 , wherein the at least one processor and memory are further configured to start measurement of the second timer when one of the rise and the fall is detected, and to stop and clear the measurement of the second timer when another one of the rise and the fall is detected.

9. The pulse discrimination device according to claim 8 , wherein the at least one processor and memory are further configured to determine that a detected electrical pulse is a noise, and to stop and clear a measurement time of the second timer, in a case where the measurement time of the second timer reaches a pulse time after the one of the rise and the fall is detected and before said another one of the rise and the fall is detected, the pulse time being predetermined based on a pulse width of the pacing pulse.

10. An electrocardiogram analyzer comprising:

the pulse discrimination device according to claim 1 ;

an electrocardiogram generator configured to generate an electrocardiogram based on an electrical signal received from the living body; and

a display configured to display the electrocardiogram generated by the electrocardiogram generator.