Closed-loop Vasopressor Infusion Using Continuous Noninvasive Blood Pressure Monitoring

Intraoperative hypotension is frequent in patients undergoing surgery and can negatively impact organ perfusion.

The investigators have developed a closed-loop vasopressor (CLV) controller to more efficiently correct hypotension.

The investigators tested it extensively in preclinical studies and recently demonstrated its feasibility and excellent performance metrics in a short series of high-risk patients undergoing major surgical procedures.

In these studies, the controller was linked to a minimally-invasive advanced hemodynamic monitoring device utilizing an arterial line which then controlled a vasopressor infusion. However, the vast majority of patients who undergo surgery do not require an arterial line but should still benefit from rapid corrections of hypotensive episodes that are less rapidly detected via an intermittent non-invasive blood pressure cuff. Fortunately, completely noninvasive technology now allows us to continuously monitor blood pressure and therefore extend the use of our closed-loop vasopressor system to patients in whom an arterial catheter would not typically be placed. Patients undergoing renal transplant surgeries are the ideal patient population.

The investigators aimed to test the feasibility of guiding our CLV controller with a continuous noninvasive blood pressure monitoring device (ClearSight system, Edwards Lifesciences, Irvine, CA, USA) in three patients (case series)

Inclusion criteria

• Adult high risk patients undergoing renal transplant surgery
• Patients equipped with a clearsight advanced hemodynamic monitoring system

Exclusion criteria

• Atrial fibrillation
• No consent obtained from the patient.
• Ejection fraction < 30%