The aim of the study is to investigate autonomic modulation in terms of heart rate variability (i.e., HRV) in patients undergoing assisted mechanical ventilation in PSV mode, compared to patients assisted in PAV+ mode. The hypothesis is that the greater patient-ventilator synchrony of the latter mode may represent an advantage in reducing the imbalance of autonomic modulation.
Patients admitted to the ICU, ≥18 years old, undergoing invasive controlled mechanical ventilation for at least 72 hours, eligible for assisted support but not yet ready for extubation or spontaneous breathing.
Successful completion of a spontaneous breathing trial (SBT) and spontaneous breathing within 24 hours of enrollment
Acute ischemic heart disease, cardiac rhythm abnormalities, and/or patients with pacemakers and/or treated with anti-arrhythmic drugs
Hemodynamic instability
Chest drainage