Figure 2: Ventricular Rate and Heart Rate Variability (HRV).The patient’s implantable loop recorder (ILR) recorded an abrupt increase in her average ventricular rate and an abrupt decrease in her HRV upon initial cardioneuroablation (CNA). In the months following, the patient’s ILR recorded a gradual regression to pre-procedural values in both average ventricular rate and heart rate variability, culminating in her recurrent syncopal event over 7 months later. On repeat CNA, she again exhibited an abrupt drop in HRV, though without a sustained rise in her average ventricular rate.