Results of communication thresholds in relation to the angle of the LP (blue) and distance of the LP to the S-ICD coil (red), during acute testing at implant and testing at 90 days post-implant. The median communicating threshold during acute testing and testing at 90 days follow-up were 2.5V (IQR 2.0–3.0V) and 1.5V (IQR 1.0–2.0V) respectively. IQR, interquartile range; LP, leadless pacemaker; S-ICD, subcutaneous implantable cardioverter-defibrillator.