System and method of identifying sources associated with biological rhythm disorders
An example system and method associated with identifying and treating a source of a heart rhythm disorder are disclosed. In accordance therewith, a spatial element associated with a region of the heart is selected. Progressive rotational activations or progressive focal activations are determined in relation to the selected spatial element over a period of time. The selecting and determining are repeated over multiple periods of time. A source parameter of rotation activations or focal activations is determined, wherein the source parameter indicates consistency of successive rotational activations or focal activations in relation to a portion of the region of the heart. The determining of a source parameter is repeated for multiple regions of the heart. Thereafter, representation of the source parameter is displayed for each of the multiple regions of the heart to identify a shape representing the source of the heart rhythm disorder.
1. A method of defining a driver of a source associated with a cardiac rhythm disorder of a human heart, the method comprising a computing device:
processing a plurality of cardiac signals associated with sensors arranged spatially in relation to an area of the heart to determine a sequence of activations in relation to the sensors over a time interval;
determining rotational directions of the activations in the sequence;
identifying the area of the heart as controlling the source when the rotational directions of the activations in the sequence continue in a same rotational direction in excess of a threshold; and
displaying a representation of the identified area of the heart.
2. The method of claim 1 , wherein the sensors define vertices of the area of the heart.
3. The method of claim 2 , wherein the area comprises a plurality of areas of the heart defined by the vertices, the plurality of areas associated with controlling the source of the cardiac rhythm disorder.
4. The method of claim 3 , wherein one or more of the areas of the heart form a rotor.
5. The method of claim 4 , wherein the rotational direction is one of clockwise and counterclockwise.
6. A method of identifying a source of a heart rhythm disorder, the method comprising receiving at a computing device a plurality of cardiac signals associated with sensors arranged spatially in relation to regions of the heart and the computing device:
selecting a spatial element associated with a sensor corresponding to a region of the heart;
determining progressive rotational activations or progressive focal activations in relation to the selected spatial element over a period of time;
repeating the selecting and determining over multiple periods of time;
determining an index of rotational activations or focal activations, wherein the index indicates consistency of successive rotational activations or focal activations in relation to a portion of the region of the heart;
repeating the determining of an index for multiple regions of the heart;
identifying the source of the heart rhythm disorder based on the determined index; and
displaying a representation of the identified source of the heart rhythm disorder.
7. The method of claim 6 , wherein the index is associated with a frequency of successive rotational activations in the region of the heart.
8. The method of claim 6 , wherein the index is associated with a frequency of progressive angular displacement in the region of the heart.
9. The method of claim 6 , wherein the index is a regularity with which the rotational activations or focal activations are present.
10. The method of claim 9 , wherein the regularity is one of periodicity, repetitiveness, and/or frequency of occurrence of rotational or focal activations.
11. A method of determining one or more sources of a heart rhythm disorder, the method comprising receiving at a computing device a plurality of cardiac signals associated with sensors arranged spatially in relation to regions of the heart and the computing device:
selecting a spatial element associated with a sensor corresponding to a region of a heart;
determining progressive rotational activations or progressive focal activations in relation to the selected spatial element;
determining a plurality of indexes of progressive rotational activations or progressive focal activations over time;
selecting from the plurality of indexes one or more indexes that indicate consistency of the progressive rotational activations or progressive focal activations to determine the one or more sources of the heart rhythm disorder; and
displaying a representation of the one or more indexes to identify one or more shapes representing the one or more sources of the heart rhythm disorder.
12. The method of claim 11 , wherein an index of a progressive rotational activation is a progressive angular displacement in relation to the selected spatial element.
13. The method of claim 11 , wherein an index of a progressive focal activation is a progressive angular displacement in relation to the selected spatial element.
14. The method of claim 11 , wherein an index of a progressive rotational activation is a polar analysis of rotation in relation to the selected spatial element.
15. The method of claim 11 , wherein an index of a progressive focal activation is a polar analysis of rotation in relation to the selected spatial element.
16. The method of claim 11 , wherein the selecting a spatial element, determining progressive rotational or focal activations, determining a plurality of indexes, and selecting from the plurality of indexes are performed for a plurality of regions of the heart.
17. The method of claim 11 , wherein a progressive rotational activation is measured in a polar coordinate system.
18. The method of claim 11 , wherein a progressive rotational activation is measured by progressively increasing or decreasing activation time.
19. The method of claim 11 , wherein a progressive rotational activation is measured by progressive change in phase.