Method and system for measuring cardiac tissue health based on DV/DT
A method for determining cardiac tissue health based on a depolarization wave within an EGM is disclosed. The method includes computing a first derivative with respect to time (DV/DT) of the EGM, determining extrema for the first derivative, establishing a value DV/DT MIN based on the extrema and mapping the value DV/DT MIN to cardiac tissue.
1. A method for determining cardiac tissue health based on a depolarization wave within an electrogram (EGM), comprising:
receiving, by a processor, an electrogram (EGM), wherein the EGM comprises at least one of a unipolar EGM and a bipolar EGM;
removing, by the processor, noise from the EGM when the noise is above a predefined threshold;
computing, by the processor, a first derivative with respect to time (DV/DT) of the EGM;
determining, by the processor, extrema for the first derivative, wherein the extrema comprises at least a maxima and a minima;
based on the extrema, establishing, by the processor, a value DV/DT MIN by selecting at least one of
the minima as the value for DV/DT MIN for the unipolar EGM;
the maxima and the minima for the bipolar EGM as the value for DV/DT MIN based on a ratio; and
mapping, by the processor, the value DV/DT MIN to cardiac tissue.
2. The method of claim 1 , wherein the value for DV/DT MIN for the bipolar EGM is selected as Min dV/dt when the ratio |Min dV/dt|/|Max dV/dt| is greater than or equal to one.
3. The method of claim 1 , wherein the value for DV/DT MIN for the bipolar EGM is selected as the −Max dV/dt when the ratio |Min dV/dt|/|Max dV/dt| is less than one.
4. The method of claim 1 , wherein the noise is removed by applying a power line filter or a random noise filter to the EGM.
5. A system for determining cardiac tissue health based on a depolarization wave within an electrogram (EGM), comprising:
a memory; and
one or more processors coupled to the memory programmed with executable instructions to:
receive an electrogram (EGM), wherein the EGM comprises at least one of a unipolar EGM and a bipolar EGM;
remove noise from the EGM when the noise is above a predefined threshold;
compute a first derivative with respect to time (DV/DT) of the EGM;
determine extrema for the first derivative, wherein the extrema comprise at least a maxima and a minima;
based on the extrema, establish a value DV/DT MIN by selecting at least one of
the minima as the value for DV/DT MIN for the unipolar EGM;
the maxima and the minima for the bipolar EGM as the value for DV/DT MIN based on a ratio; and
map the value DV/DT MIN to cardiac tissue.
6. The system of claim 5 , wherein the value for DV/DT MIN for the bipolar EGM is selected as Min dV/dt when the ratio |Min dV/dt|/|Max dV/dt| is greater than or equal to one.
7. The system of claim 5 , wherein the value for DV/DT MIN for the bipolar EGM is selected as the −Max dV/dt when the ratio |Min dV/dt|/|Max dV/dt| is less than one.
8. The system of claim 5 , wherein the noise is removed by applying a power line filter or a random noise filter to the EGM.
9. A non-transitory computer readable storage medium, having stored thereon, a set of computer-executable instructions that causes a computer to perform the method comprising:
receiving an electrogram (EGM), wherein the EGM comprises at least one of a unipolar EGM and a bipolar EGM;
removing noise from the EGM when the noise is above a predefined threshold;
computing a first derivative with respect to time (DV/DT) of the EGM;
determining extrema for the first derivative, wherein the extrema comprise at least a maxima and a minima;
based on the extrema, establishing a value DV/DT MIN by selecting at least one of
the minima as the value for DV/DT MIN for the unipolar EGM;
the maxima and the minima for the bipolar EGM as the value for DV/DT MIN based on a ratio; and
mapping the value DV/DT MIN to cardiac tissue.
10. The non-transitory computer readable storage medium of claim 9 , wherein the value for DV/DT MIN for the bipolar EGM is selected as Min dV/dt when the ratio |Min dV/dt|/|Max dV/dt| is greater than or equal to one.
11. The non-transitory computer readable storage medium of claim 9 , wherein the value for DV/DT MIN for the bipolar EGM is selected as the −Max dV/dt when the ratio |Min dV/dt|/|Max dV/dt| is less than one.
12. The non-transitory computer readable storage medium of claim 9 , wherein the noise is removed by applying a power line filter or a random noise filter to the EGM.