Identifying ambiguous cardiac signals for electrophysiologic mapping

A system for use in monitoring cardiac signals comprising:

• an electrode apparatus comprising a plurality of electrodes configured to be located proximate tissue of a patient and provide a plurality of signals corresponding to a plurality of channels;
• a display apparatus comprising a graphical user interface, wherein the graphical user interface is configured to present information corresponding to one or more of the plurality of channels;
• computing apparatus coupled to the electrode apparatus and display apparatus, wherein the computing apparatus is configured to determine a maximum for each of the beats of the signal on one or more of the plurality of channels, wherein, to determine the maximum for each of the beats of the signal on one or more of the plurality of channels, the computing apparatus configured to:
• calculate a square of a first derivative of the signal comprising a plurality of time indexed samples;
• analyze the signal and select at least indexed samples where the square of the first derivative is greater than a ratio value (R) times the maximum of the square of the first derivative (M2);
• in response to all data of time indexed samples associated with the signal being analyzed, calculate a second derivative thereof;
• determine local maximums of the signal using the second derivative;
• determine an index difference between an index of a first local maximum of the local maximums and an index of a second local maximum of the local maximums and determine if the index difference is greater than a first preselected number or less than a second preselected number;
• in response to the index difference being less than the first preselected number and greater than the second preselected number, determine a maximum for each of the beats;
• and
• in response to the index difference being greater than the first preselected number or less than the second preselected number, modify the R resulting in a modified R.

A method for use in monitoring cardiac signals, comprising:

• providing an electrode apparatus, the electrode apparatus being located proximate tissue of a patient and configured to provide a plurality of signals corresponding to a plurality of channels;
• acquiring a plurality of signals using the electrode apparatus, wherein each signal corresponds to one of the plurality of channels,
• determining a maximum for each beat of a signal corresponding to one of the plurality of channels, wherein determining a maximum for each beat of the signal comprises:
• calculating a square of a first derivative of the signal comprising a plurality of time indexed samples;
• analyzing the signal and selecting at least indexed samples where the square of the first derivative is greater than a ratio value (R) times the maximum of the square of the first derivative (M2);
• in response to all data of indexed samples associated with the signal being analyzed, calculating a second derivative thereof;
• determining local maximums of the signal using the second derivative;
• determining an index difference between an index of a first local maximum and an index of a second local maximum of the local maximums and determining if the index difference is greater than a first preselected number or less than a second preselected number;
• in response to the index difference being less than the first preselected number and greater than the second preselected number, determining a maximum for each of the beats;
• and
• in response to the index difference being greater than the first preselected number or less than the second preselected number, modify the R resulting in a modified R.