ESTIMATING RV-TIMINGS FROM LEFT VENTRICULAR (LV) SENSING TIMES FOR ADAPTIVE CARDIAC RESYNCHRONIZATION THERAPY USING DDD/VDD LV PACING WITHOUT A RIGHT VENTRICULAR (RV) LEAD
Methods and/or devices may be configured to estimate right ventricular-timings from left ventricular (LV) sensing times for adaptive cardiac therapy using DDD/VDD LV pacing without using a right ventricular (RV) lead. One embodiment employs a subcutaneous device (SD) in a patient and a leadless pacing device (LPD) coupled to a patients heart. Heart activity including atrial and ventricular events are sensed from the patients heart using the SD. Left ventricular events (LVS) are sensed using the LPD. The SD is used to determine whether cardiac resynchronization pacing therapy (CRT pacing) is appropriate based upon the heart activity sensed by the SD. The SD is further configured to determine timing of CRT pacing pulses for delivery to cardiac tissue through the LPD.
