Minimisation of Blood Pressure Variability and Postoperative Nausea and Vomiting (SICK)

Medical University of Vienna

Status: Enrolling

Conditions: Postoperative Recovery; PONV; Blood Pressure

Treatments: Other: Minimizing blood pressure variability

Study type: Interventional

Funder types: Other

Identifiers

NCT05596695

SICK_01

Details and patient eligibility

About

Intraoperative hypotension is associated with postoperative nausea and vomiting (PONV). Even though the exact mechanism linking PONV and hypotension is still unclear, a reduced intestinal tissue perfusion might trigger nausea and vomiting. Still to date only limited data evaluating intraoperative blood pressure and the incidence of PONV after general anesthesia exits. Furthermore, the effect of intraoperative blood pressure variability on the incidence of PONV has not been investigated yet. Therefore, we will test our primary hypothesis that the incidence of PONV during the early (0-2h) postoperative period will be minimized by targeting intraoperative blood pressure variability to a SPB of 120±5mmHg by using a continuous vasopressor infusion in female patients undergoing elective minor to moderate risk non-cardiac surgery.

Full description

Background: Intraoperative hypotension is associated with postoperative nausea and vomiting (PONV). Even though the exact mechanism linking PONV and hypotension is still unclear, a reduced intestinal tissue perfusion might trigger nausea and vomiting. Still to date only limited data evaluating intraoperative blood pressure and the incidence of PONV after general anesthesia exits. Furthermore, the effect of intraoperative blood pressure variability on the incidence of PONV has not been investigated yet. Therefore, we will test our primary hypothesis that the incidence of PONV during the early (0-2h) postoperative period will be minimized by targeting intraoperative blood pressure variability to a SPB of 120±5mmHg by using a continuous vasopressor infusion in female patients undergoing elective minor to moderate risk non-cardiac surgery.

Methods: We will include 272 women between 18 and 50 years of age undergoing minor- to moderate-risk noncardiac surgery in this randomized, double-blinded clinical trial. Patients will randomly be assigned to intraoperative management of blood pressure with a SPB of 120±5mmHg (intervention group) or standard of care intraoperative blood pressure management (control group). Our primary outcome will be the incidence of PONV during the early (0-2h) postoperative period between the groups. Nausea will be assessed in 15-min intervals in the PACU for the first two postoperative hours on a 100mm visual analog scale. A PONV episode will be defined as the occurrence of nausea (VAS 50mm or greater) or vomiting.

Statistics: The primary outcome, the incidence of PONV during the early (0-2 hours) postoperative period will be compared between the intervention and control group using a Chi- Square-Test.

Level of originality: Data regarding the effects of intraoperative blood pressure on PONV are very limited and mainly available from retrospective analysis. So far, the effects of blood pressure variability on PONV have not been investigated yet. As PONV is still one of the most common complications after general anaesthesia leading to delayed discharge from PACU, patient discomfort and increased medical costs, it is important to search for additional methods to manage PONV. Our patient population, being at increased risk of PONV, could therefore profit from a more rapid postoperative recovery.

Enrollment: 272 estimated patients

Sex: Female

Ages: 18 to 50 years old

Volunteers: No Healthy Volunteers

Inclusion criteria

• Women 18-50 years of age at time of surgery
• ASA physical status I and II
• Scheduled for elective minor or moderate risk non-cardiac surgery with expected time of surgery ≥1 hour

Exclusion criteria

• Patients undergoing emergency surgery
• Scheduled for pheochromocytoma surgery
• Nausea and/or vomiting on the morning before surgery
• Taking anti-emetic drugs
• Pregnancy
• Dysfunction of the vestibular system

Trial design

Primary purpose: Prevention

Allocation: Randomized

Interventional model: Parallel Assignment

Masking: Double Blind

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272 participants in 2 patient groups

Intervention Group

Experimental group

Description:

Intraoperative blood pressure management will be performed to maintain a systolic blood pressure of 120 ±5mmHg using a continuous infusion of a vasopressor starting at induction of anesthesia.

Treatment:

Other: Minimizing blood pressure variability

Standard of Care Group

No Intervention group

Description:

Intraoperative blood pressure management will be performed according to local clinical standard of care.