The Effect of Minimal Flow Anesthesia on Oxidative and Neuroendocrine Stress Response

Summary

Patients under general anesthesia who are unconscious and have stopped spontaneous breathing are actively ventilated with anesthesia machines, ensuring the anesthesia gas reaches the lungs and then the bloodstream. Not all the gas reaching the lungs during respiration is used; a small portion is absorbed by the body, and most of it is expelled during exhalation. After eliminating the carbon dioxide in the expired gas, it is more suitable to re-breathe the remaining gas. The portion taken by the patient needs to be provided for the next breath, and this added gas is called "fresh gas flow." Today, low flow anesthesia is defined when the fresh gas flow rate is 0.5-1 L/min, minimal flow anesthesia when it is 0.25-0.5 L/min, and metabolic flow anesthesia when it is 0.25 L/min. Our study will evaluate the effects of minimal flow anesthesia, which is widely used today due to its advantages, on oxidative stress and neuroendocrine stress response

Conditions

• Low Flow Anesthesia
• Oxidative Stress
• Neuroinflammatory Response

Interventions

OTHER

The minimal flow anesthesia with sevoflurane group

In the minimal flow group, anesthesia will be maintained with minimal fresh gas flow (0.3-0.5 L/min). The effect of minimal flow anesthesia on oxidative and neuroendocrine stress response will be evaluated by the levels of: IL-6 (proinflammatory cytokine), ACTH (adrenocorticotropic hormone), Cortisol, TAS/TOS (total antioxidant/oxidant status) measured from blood samples. Blood samples will be taken from the antecubital area before the surgery begins, thus eliminating the need for repeated invasive procedures. Blood samples will be taken from the patients just before the surgery begins, at the end of the surgery, and at the 6th and 18th hours after the surgery.

OTHER

The high flow anesthesia with sevoflurane group

Maintenance of anesthesia in the high flow group will be provided with a high fresh gas flow (4 L/min). The effect of high flow anesthesia on oxidative and neuroendocrine stress response will be evaluated by the levels of: IL-6 (proinflammatory cytokine), ACTH (adrenocorticotropic hormone), Cortisol, TAS/TOS (total antioxidant/oxidant status) measured from blood samples. Blood samples will be taken from the antecubital area before the surgery begins, thus eliminating the need for repeated invasive procedures. Blood samples will be taken from the patients just before the surgery begins, at the end of the surgery, and at the 6th and 18th hours after the surgery.

Sponsors & Collaborators

• Bezmialem Vakif University

  lead OTHER

Principal Investigators

• Resident Doctor · Bezmialem Vakif University

Study Design

Allocation

RANDOMIZED

Purpose

SCREENING

Masking

TRIPLE

Model

PARALLEL

Eligibility

Min Age

18 Years

Max Age

65 Years

Sex

ALL

Healthy Volunteers

No

Timeline & Regulatory

Start

2024-06-30

Primary Completion

2024-11-30

Completion

2024-12-31

Countries

• Turkey (Türkiye)

Study Locations