Intracardiac electrocardiogram presentation

A medical method, comprising:

• receiving signals from a catheter configured to be inserted into a chamber of a heart of a living subject, and including catheter electrodes configured to contact tissue at respective locations within the chamber of the heart;
• in response to the signals, sampling respective voltage values of the signals at respective timing values;
• and
• rendering to a display respective intracardiac electrograms (IEGM) presentation strips representing electrical activity in the tissue that is sensed by the catheter electrodes at the respective locations, each of the IEGM presentation strips including a linear array of respective shapes associated with, and arranged in a temporal order of, respective ones of the timing values, fillers of the respective shapes being formatted responsively to respective ones of the sampled voltage values of a respective one of the signals sampled at respective ones of the timing values, wherein the shapes of the IEGM presentation strips are formatted to show additional attributes of the signals, including rate of change of the respective signal and a fractionation of the respective signal.

A software product, comprising a non-transient computer-readable medium in which program instructions are stored, which instructions, when read by a central processing unit (CPU), cause the CPU to:

• receive signals from a catheter configured to be inserted into a chamber of a heart of a living subject, and including catheter electrodes configured to contact tissue at respective locations within the chamber of the heart;
• in response to the signals, sample respective voltage values of the signals at respective timing values;
• and
• render to a display respective intracardiac electrograms (IEGM) presentation strips representing electrical activity in the tissue that is sensed by the catheter electrodes at the respective locations, each of the IEGM presentation strips including a linear array of respective shapes associated with, and arranged in a temporal order of, respective ones of the timing values, fillers of the respective shapes being formatted responsively to respective ones of the sampled voltage values of a respective one of the signals sampled at respective ones of the timing values, wherein the shapes of the IEGM presentation strips are formatted to show additional attributes of the signals, including rate of change of the respective signal and a fractionation of the respective signal.