Hypotension Prediction Index (HPI) and Assisted Fluid Management (AFM) for Perioperative Hemodynamic Optimization in Patients Under General Anesthesia

National and Kapodistrian University of Athens

Status: Not yet enrolling

Conditions: Intraoperative Hypotension

Treatments: Other: Conventional Intraoperative Hemodynamic management; Device: Acumen IQ sensor with Hypotension Prediction Index (HPI) and Assisted Fluid Management (AFM) software

Study type: Interventional

Funder types: Other

Identifiers

NCT07301307

641/24-09-2025

Details and patient eligibility

About

This study investigates if the Hypotension Prediction Index (HPI) combined with the Assisted Fluid Management (AFM) software can improve perioperative hemodynamic management in adult patients undergoing general anesthesia. The main question is :

Does the HPI and AFM software reduce the incidence and duration of intraoperative hypotension? Does the HPI and AFM software optimize fluid and vasopressor administration? Does the HPI and AFM software improve perioperative outcomes? Participants will be randomly allocated to either an experimental group receiving goal directed hemodynamic therapy guided by HPI and AFM or a control group receiving conventional hemodynamic management.

Full description

Intraoperative hypotension is a common complication during general anesthesia and is associated with an increased risk of postoperative organ dysfunction (acute kidney injury, myocardial ischemia). Even short episodes of mean arterial pressure (MAP) below accepted thresholds have been shown to adversely affect patient outcomes.

The Hypotension Prediction Index , (HPI)is a software that predicts the likelihood of hypotension minutes before it occurs, based on the arterial waveform. Thus clinicians have the opportunity to identify patients at risk of hypotension and intervene early.

The Assisted Fluid Management (AFM) software is designed to optimize perioperative fluid administration based on the Frank-Starling curve. The AFM provides guidance on crystalloid admininistration only when it is expected to increase stroke volume and cardiac output.

This prospective , randomized study evaluates whether the use of HPI coupled with AFM within a goal directed hemodynamic protocol improves perioperative hemodynamic management and reduces the incidence and duration of adult patients undergoing surgery under general anesthesia.

A total of 100 adult patients will be enrolled , for elective surgery with invasive blood pressure monitoring and intraoperative mean arterial pressure target of at least 65 mm Hg.

Patients in the intervention group will undergo goal directed hemodynamic management guided by HPI and AFM algorithms via the Hemosphere monitor and Acumen IQ sensor. The AFM software will determine the timing of fluid administration. Elevated HPI values indicating impending hypotension will be managed in a targeted manner with fluids, vasopressors or inotropes.

Patients in the control group will receive conventional hemodynamic management , based on clinical judgement, in accordance with international guidelines. Although an Acumen IQ sensor will be placed, HPI and AFM indications will not be visible to the attending anesthesiologist and will not influence clinical decision making.

Intraoperative hemodynamic data will be continuously recorded in both groups. A member of the research team will be present to supervise the procedure. The primary outcome is the time-weighted average of hypotension, defined as MAP below 65 mm Hg for at least one minute. Secondary outcomes include the incidence and duration of hypotension, type and dose of administered therapies and protocol adherence.

Enrollment: 100 estimated patients

Sex: All

Ages: 18+ years old

Volunteers: No Healthy Volunteers

Inclusion criteria

• Age > 18 years
• Intraoperative monitoring > 2 hours or general anesthesia > 2 hours
• Invasive arterial pressure monitoring
• Target MAP ≥ 65 mm Hg intraoperatively
• Written informed consent preoperatively
• ASA Physical Status ≤ 4

Exclusion criteria

• Target MAP other than 65 mm Hg
• Severe preoperative hypotension (MAP < 65 mm Hg)
• Severe heart failure (e.g. LVEF < 20%)
• Emergency surgery

Trial design

Primary purpose: Treatment

Allocation: Randomized

Interventional model: Parallel Assignment

Masking: None (Open label)

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100 participants in 2 patient groups

HPI/AFM - Goal- Directed Hemodynamic Therapy

Experimental group

Description:

Participants will receive goal-directed hemodynamic therapy guided by the Hypotension Prediction Index and Assisted Fluid Management software, using the Hemosphere monitor. Interventions include protocol-guided fluid and vasopressors to prevent or treat intraoperative hypotension.

Treatment:

Device: Acumen IQ sensor with Hypotension Prediction Index (HPI) and Assisted Fluid Management (AFM) software

Conventional therapy

Active Comparator group

Description:

Participants will receive conventional hemodynamic intraoperative management based on anesthesiologist's clinical judgement. The Acumen IQ sensor will be placed but Hypotension Prediction Index and Assisted Fluid Management outputs will not be visible to the anesthesiologist.

Treatment:

Other: Conventional Intraoperative Hemodynamic management