Image display interfaces

1. Apparatus for monitoring activation in a heart, the apparatus comprising a probe, a plurality of electrodes arranged in an array and supported on the probe and each configured, for a position of the probe, to detect electrical potential at a respective position in the heart during a series of activations of the heart, and a processor configured to analyse the detected electrical potentials to identify a respective propagation direction of each of the series of activations at each of the positions, and, for each of the positions, to generate a first output indicative of the direction of at least one of the activations, for each of the positions, determine a consistency of the propagation directions over the series of activations, and for each of the positions, generate a second output indicative of the consistency of the propagation directions.

2. Apparatus according to claim 1 wherein said direction is a first direction and second output is indicative of a second direction of propagation of activation of at least one of the activations, and the second direction is different from the first direction.

3. Apparatus according to claim 1 further comprising a display screen wherein the processor is configured to control the display screen to generate a display indicative of the direction and the consistency of the directions.

4. Apparatus according to claim 3 wherein the processor is configured to analyse the detected potentials for a plurality of positions of the probe in the heart, and control the display screen to indicate simultaneously at least one direction of propagation at each of the positions of the probe.

5. Apparatus according to claim 3 wherein the processor is configured to control the display screen to display a representation of the heart and to indicate the direction of propagation of the activation at a position on the representation corresponding to the position of the probe in the heart.

6. Apparatus according to claim 3 wherein the processor is configured to control the display screen to display a representation of the probe and to indicate the direction of propagation relative to the probe, on the representation of the probe, the apparatus further comprising an imaging system configured to display an image of the heart and the probe.

7. Apparatus according to claim 3 wherein the processor is configured to control the display screen to indicate the direction of propagation by displaying a plurality of image objects moving in a corresponding direction on the display.

8. Apparatus according to claim 1 further comprising a display screen, wherein the processor is configured to determine the direction of propagation relative to the heart, at at least one position, for each of a series of sample periods and to control the display screen to show the distribution of the directions of propagation at said at least one position.

9. Apparatus according to claim 1 wherein the processor is configured to determine from the detected potentials interpolated values of at least one parameter of the detected potentials at positions having a spatial resolution which is finer than a spatial resolution of the electrodes, and to determine a direction of propagation at each of said positions.

10. Apparatus for monitoring activation in a heart, the apparatus comprising a probe, a plurality of electrodes arranged in an array and supported on the probe and each configured to detect electrical potential at a respective position in the heart during a series of activations of the heart, a display screen, and a processor configured to process the detected electrical potentials and control the display screen to display an image showing variation in the potentials with time during each of the activation events, and also configured to control the display screen to display a direction indicator configured to indicate a direction of propagation of at least one of the activation events relative to the probe, wherein the processor is further configured to receive a user input and to adjust the direction of the direction indicator in response to the user input.

11. Apparatus according to claim 10 wherein the processor is also configured to determine the position of the probe relative to the heart, and to determine therefrom the direction of the propagation relative to the heart.

12. Apparatus according to claim 11 wherein the processor is configured to control the display screen to display an image of the heart, and to display a further direction indicator arranged to indicate the direction of propagation relative to the heart.

13. Apparatus according to claim 12 wherein the processor is configured to determine the direction of propagation relative to the heart for each of a series of sample periods, and to display simultaneously a direction indicator for each direction of propagation.

14. Apparatus according to claim 13 wherein the processor is configured to control the display screen to display the direction indicators at respective positions on the image of the heart corresponding to the position of the probe during the relevant sample period.

15. An apparatus for monitoring activation in a heart, comprising:

a probe;

a plurality of electrodes arranged in an array and supported on the probe and each electrode configured, for a position of the probe, to detect electrical potential at a respective position in the heart during a series of activations of the heart;

a processor with memory; the memory comprising non-transitory instructions that when executed by the processor:

analyse the detected electrical potentials to identify a respective propagation direction of each of the series of activations at each of the positions;

generate, for each of the positions, a first output indicative of the direction of at least one of the activations;

determine, for each of the positions, a consistency of the propagation directions over the series of activations; and

generate, for each of the positions, a second output indicative of the consistency of the directions.