Left ventricular assist devices (LVADs) are being increasingly used due to their positive impact on survival and quality of life in patients with advanced heart failure (HF). Despite these advancements, the recovery of circadian patterns in cardiovascular activity after LVAD implantation still needs further investigation. Unlike healthy individuals, in patients with HF, these 24-hour natural rhythms are often altered or absent in several cardiovascular parameters, including heart rate and blood pressure. In this context, the current study aimed to explore the role and temporal evolution of circadian rhythms during HeartMate 3 (HM3) support at Vienna General Hospital. The analysis focused on the minimum pump flow signal, recorded at 1 Hz using the HM3 Snoopy mobile monitoring system during ICU and outpatient phases.