High-flow Anesthesia Research Articles

A488 The Accuracy and Precision of Tracheal, Deep Forehead, and Deep Sternal Temperatures During High and Low Flow Anesthesia

A488 The Accuracy and Precision of Tracheal, Deep Forehead, and Deep Sternal Temperatures During High and Low Flow Anesthesia

Low-flow and minimal-flow anaesthesia using the laryngeal mask airway.

This study was designed to investigate whether the advantages of low- and minimal-flow anaesthesia can be combined with the laryngeal mask airway (LMA). Seventy female patients undergoing routine gynaecological surgery were investigated. After induction of anaesthesia and after positioning a laryngeal mask airway nos 3 and 4, patients were ventilated for 20 min with a fresh gas flow of 6 L min-1. Thereafter, the flow was reduced to 1 L min-1 in 50 patients and to 0.5 L min-1 in 20 patients. Once in the proper position, the LMA allowed flow reduction in all patients, indicating that no gas leakage occurred. It is concluded, that the application of low-flow and even minimal-flow anaesthesia is an alternative to high-flow anaesthesia. It can result in high annual savings and minimization of pollution. However, its use should be restricted to those anaesthesiologists who are experienced with the laryngeal mask airway and minimal-flow anaesthesia.

Low-flow and minimal-flow anaesthesia using the laryngeal mask airway

This study was designed to investigate whether the advantages of low- and minimal-flow anaesthesia can be combined with the laryngeal mask airway (LMA). Seventy female patients undergoing routine gynaecological surgery were investigated. After induction of anaesthesia and after positioning a laryngeal mask airway nos 3 and 4, patients were ventilated for 20 min with a fresh gas flow of 6 L min−1. Thereafter, the flow was reduced to 1 L min−1 in 50 patients and to 0.5 L min−1 in 20 patients. Once in the proper position, the LMA allowed flow reduction in all patients, indicating that no gas leakage occurred. It is concluded, that the application of low-flow and even minimal-flow anaesthesia is an alternative to high-flow anaesthesia. It can result in high annual savings and minimization of pollution. However, its use should be restricted to those anaesthesiologists who are experienced with the laryngeal mask airway and minimal-flow anaesthesia.

Comparing effects of low and high-flow anesthesia on hemorheology and coagulation factors.

Objectives:In the current study, we compared the effects of low- and high-flow anesthesia techniques on hemorheology and coagulation parameters in patients who received sevofluran.Methods:Forty patients classified as Risk Group I–II according to American Society of Anesthesiologists’ (ASA) guidelines who were scheduled to undergo general anesthesia were randomly assigned to one of two groups. Low-flow anesthesia was administered to the first group, and high-flow anesthesia was used in the second group. Blood samples were obtained in the preoperative and peroperative periods (at 60 and 120 min) for determination of blood and plasma viscosity, plasma oncotic pressure, international normalized ratio (INR), phorotrombin time (PT), activated partial phorotrombin time (aPTT) and fibrinogen. Blood was also drawn for analysis of factor VIII (FVIII) activity, which was measured in the preoperative period and at postoperative six hour.Results:The peroperative plasma viscosity was significantly low in Group 1 relative to Group 2. aPTT was significantly elevated at 60 minutes in Group 1 relative to Group 2, but the increase at 120 minutes was not significant.Conclusion:The effects of low-flow anesthesia on hemorheology were greater than those of high-flow anesthesia.