Methods and systems for classifying a heartbeat associated with patients in sinus rhythm
Techniques are disclosed to identify if a current chamber being mapped is a target chamber that is desired to be mapped based on the relative position of the local activation time relative to QRS onset. Techniques are also disclosed whereby cardiac data can be labeled to indicate whether a beat was acquired while in the ventricle, or in the atrium.
1. A method, for electrophysiological mapping of a heart, comprising:
inserting a mapping catheter into a heart;
driving body surface electrodes with current pulses:
measuring electrical recordings for the heart using the mapping catheter inserted into the heart and due to the driven current pulses;
calculating a time of QRS onset for ventricular depolarization of the heart;
selecting portions of the electrical recordings indicative of a heartbeat;
calculating, for each selected portion, a local activation time:
identifying a chamber of the heart based on a relative position of the local activation time and the time of QRS onset for ventricular depolarization;
receiving input of a target chamber of the heart desired to be mapped;
detecting when the identified chamber is within said target chamber; and
providing an alert when the identified chamber is no longer within said target chamber.
2. The method of claim 1 , wherein said target chamber is selected from the group consisting of an atrial chamber and a ventricular chamber.
3. The method of claim 2 , when the local activation time is earlier than the QRS onset, then the identified chamber is identified as the atrial chamber otherwise the identified chamber is identified as the ventricular chamber when said local activation time is later than the QRS onset.
4. The method of claim 1 , wherein the alert comprises an audible alarm.
5. The method of claim 4 , wherein, on activation of the alert, the method further comprises moving the mapping catheter back to the chamber.
6. The method of claim 1 , wherein identifying the chamber of the heart comprises using a beat classification technique.
7. The method of claim 6 , wherein the beat classification technique comprises generating a template from a reference signal selected from signals provided by the body surface electrodes.
8. The method of claim 7 , wherein selecting the reference signal comprises selection the reference signal based on stability and noise characteristics of the signals.