Does the laminar iirflow system affect the development of perioperative hypothermia? a randomized clinical trial
Date
2021Metadata
Show full item recordAbstract
Objectives: We aimed to compare tympanic membrane temperature changes and the incidence of
inadvertent perioperative hypothermia (IPH) in patients undergoing laparoscopic cholecystectomy
under general anesthesia in laminar airflow systems (LAS-OR) and conventional turbulent airflow
systems (CAS-OR). Background: Different heating, ventilation, and air-conditioning (HVAC) systems
are used in the operating room (OR), such as LAS and CAS. Laminar airflow is directed directly
to the patient in LAS-OR. Does laminar airflow in ORs cause faster heat loss by convection? Methods:
This is a prospective, randomized study. We divided 200 patients with simple randomization (1:1), as
group LAS and group CAS, and took the patients into the LAS-OR or CAS-OR for the operation.
Clinical trial number: IRCT20180324039145N3. The tympanic membrane temperatures of patients
were measured ( C) before anesthesia induction (T0) and then every 15 min during surgery (Tn).
Changes (Dn) between T0 and Tn were measured. Results: In the first 30 min, there was a temperature
decrease of approximately 0.8 C (1.44 F) in both groups. Temperature decreases at 45 min were
higher in group LAS than in group CAS but not statistically significant, D45, respectively, 0.89 (95%
confidence interval [CI] [0.77, 1.02]) versus 0.77 (95% CI [0.69, 0.84]; p ¼ .09). IPH occurred in a total
of 60.9% (112 of 184) of patients in the entire surgical evaluation period in group LAS and group CAS
(58.9% vs. 62.8%, p ¼ . 59). Conclusions: IPH is seen frequently in both HVAC systems. Clinically, the
advantage of HVAC systems relative to each other has not been demonstrated during laparoscopic
cholecystectomy.