Effect of Active Warming on Surgical Site Infections

Not Applicable

• Conditions: Ventral Hernia; Surgical Site Infection
• Interventions: Device: Surgical access blanket; Device: Surgical Underbody Blanket

• Registration Number: NCT04187378
• Lead Sponsor: Istanbul University - Cerrahpasa (IUC)

Brief Summary

This study evaluates the effect of active warming by maintaining the normothermia during abdominal surgical procedures. The investigators hypothesize that there is no difference in terms of preventing surgical site infections between warm air blown surgical access blanket and underbody blanket.

Detailed Description

Hypothermia is defined as a body temperature below 36°C and classified as mild (34°C-36°C), moderate (32°C-33.9°C), severe (\<32°C) hypothermia. Hypothermia can be caused by reduced heat production, increased heat loss and / or deterioration of thermoregulation (anesthesia and premedication drugs, antiseptic solutions, low ambient temperature, wet surgical sterile drapes on the patient, use of cold intravenous fluids).

Preoperative, intraoperative and postoperative hypothermia is the drop of body temperature below 36 ° C within one hour before surgery and within 24 hours postoperatively. It is the most common but preventable thermal disorder during anesthesia. It occurs as a result of anesthesia on thermoregulation during surgery and exposure to cold operating room. Although it can be seen in all anesthetized individuals before, during and after surgery due to age, sex, body surface area and body shape; duration, depth, signs and symptoms may vary.

The American Society of Operating Room Nurses (AORN) emphasized the importance of the use of appropriate heating devices in the prevention of hypothermia in surgical patients. Experimental studies and meta-analyzes indicate that active methods of preventing hypothermia (hot air blown systems, hot water circulating blankets and garments, liquid heaters, blood and blood product heaters, etc.), passive methods (wool and synthetic woolen materials, garments and blankets, insulation) materials, etc.) are more effective. It is recommended to use more than one method together to maintain normothermia before, during and after surgery.

Hypothermia is an important problem that should be prevented in surgical patient because it causes serious problems such as delayed wound healing, bleeding, cardiac problems, deterioration of patient comfort, prolonged hospital stay, surgical site infection (SSI) and deaths.

Many guidelines state that the risk of surgical site infection increases three fold due to a decrease in central temperature of 1.9 C. According to the Guidelines for Safe Surgery published by the World Health Organization in 2009; maintaining normothermia during surgery is one of the ten steps intended to reduce the incidence of postoperative surgical site infection. The National Institute for Health and Care Excellence and the Association for Enhanced Recovery After Surgery (ERAS) recommend the maintenance of intraoperative normothermia to prevent surgical site infection.

Surgical nurse; should be aware of the causes of hypothermia and the complications that may occur during the planning, implementation and evaluation of a patient-specific, multi-faceted care; should check the body temperature before, during and after surgery and take precautions to prevent body temperature. Therefore, the body temperature of the patient should be monitored at regular intervals, the body temperature of the preventive interventions must be timely and effective implementation. The maintenance of normothermia in patients with perioperative procedures may reduce the incidence of complications due to hypothermia and may have a positive effect on the success and recovery of surgery.

Study Timeline

• Study First Submitted: 2019-11-26
• Study First Submitted QC: 2019-12-03
• Study First Posted: 2019-12-05
• Study Start: 2020-02-10
• Status Verified: 2022-03
• Last Update Submitted: 2022-03-31
• Last Update Posted: 2022-04-01
• Primary Completion: 2022-08-11
• Study Completion: 2022-12-01

Recruitment & Eligibility

• Status: UNKNOWN
• Sex: All
• Target Recruitment: 48

Inclusion Criteria

• Patients with American Society of Anesthesiologists score I-II-III,
• 18-70 years old,
• Patients undergoing abdominal surgery (ventral hernia)
• Patients whose operation lasts longer than 30 minutes and less than 3 hours

Exclusion Criteria

• Patients with American Society of Anesthesiologists score IV-V
• Patients with morbid obese (BMI> 40kg / m^2)
• Patients with neurological, psychiatric, neuromuscular disease
• Alcohol and drug addict patients
• Mental retarded patients
• Patients taking medications that affect thermoregulation, such as vasodilators
• Patients with a history of thyroid disease
• Pregnant women
• Patients undergoing pre-intra-post-blood transfusion
• Patients with blood glucose levels above 200 mg / dl

Study & Design

• Study Type: INTERVENTIONAL
• Study Design: PARALLEL

Arm && Interventions

Group	Intervention	Description
Surgical Access Blanket Group	Surgical access blanket	Patients with hypothermia (\<36C) will be warmed by air blown surgical access blanket before the surgical procedure. Warming procedure will be continued during and postoperative 2 hours of surgery. Body temperature will be measured by tympanic temperature gauge. Intravenous fluid, antiseptic solutions and irrigation fluids will be given to the patients during surgery by heating before administering. Body temperature, blood pressure, respiratory rate, heart rate and O2 saturation of the patients will be monitored every 15 minutes during the operation and postoperative 2 hours and data will be recorded on the data collection form.
Underbody Blanket Group	Surgical Underbody Blanket	Patients with hypothermia (\<36C) will be warmed by air blown underbody blanket before the surgical procedure. Warming procedure will be continued during and postoperative 2 hours of surgery. Body temperature will be measured by tympanic temperature gauge. Intravenous fluid, antiseptic solutions and irrigation fluids will be given to the patients during surgery by heating before administering. Body temperature, blood pressure, respiratory rate, heart rate and O2 saturation of the patients will be monitored every 15 minutes during the operation and postoperative 2 hours and data will be recorded on the data collection form.

Primary Outcome Measures

Name	Time	Method
Surgical Site Infection Rate	Within the postoperative 30 days	The rate of surgical site infection will be monitored for each group by the case doctor and principle investigator. The patients will be diagnosed as Surgical Site Infection (SSI) according to CDC Guidelines if there is purulent wound drainage or serous but wound culture is positive within the postoperative 30 days.

Secondary Outcome Measures

Name	Time	Method
Body Temperature	During the surgery and 2 hours after surgery (up to 300 minutes)	Before surgery, surgical access blanket or underbody blanket will be turned on at the highest temperature of the warming unit ( 43 celsius degree) and the body temperatures will be measured and registered with an tympanic thermometer every 15 minutes during surgery and 2 hours after surgery. Temperatures will be compared with the purposes of determining which one of the two models tested are more effective in keeping patient warm.
Duration of surgery	Day 0 (day of surgery)	Minutes from skin incision until skin closure

Trial Locations

Locations (1)

Muğla Sıtkı Koçman University Training and Research Hospital; 🇹🇷 Muğla, Turkey