Identifying and indicating cardiac areas exhibiting progressively slowing activation (PSA)

A system, including:

• electrodes configured to sense a cardiac signal at a location in a heart of a patient, the cardiac signal comprising signal components corresponding to respective activations;
• a display;
• and
• a processor, which is configured to:
• find and annotate the signal components in the cardiac signal;
• calculate respective time differences between the annotations and the corresponding activations;
• based on the time differences, identify one or more cardiac tissue locations that demonstrate progressively slowing activation (PSA);
• and
• present an EP map of at least a portion of the heart to a user for presentation at the display, the EP map including a graphical indication of the one or more tissue locations that demonstrate the PSA.