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, comprising:
inserting a mapping catheter into a heart of a subject;
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; and
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, wherein
the chamber of the heart is identified as an atrial chamber when the local activation time is earlier than the QRS onset, and
the chamber of the heart is identified as a ventricular chamber when the local activation time is later than the QRS onset.
2. The method of claim 1 , wherein
the method further comprises generating a template for the heartbeat.
3. The method of claim 2 , wherein
to select the portions of the electrical recordings indicative of the heartbeat, the method further comprises performing template matching based on the generated template and the electrical recordings.
4. The method of claim 3 , further comprising:
measuring an electrocardiogram;
selecting a heartbeat in the electrocardiogram; and
generating the template from the selected heartbeat in the electrocardiogram.
5. The method of claim 4 , wherein the electrocardiogram is for a reference lead.
6. The method of claim 5 , wherein selecting the heartbeat in the electrocardiogram comprises selecting a portion of the electrocardiogram where a time derivative of the portion is a minimum and the portion exceeds a threshold magnitude.