scholarly journals Evaluation of an Oxford Miniature Vaporizer Placed in-Circuit during the Maintenance Phase of Low-Flow Anaesthesia

2008 ◽  
Vol 36 (5) ◽  
pp. 695-700 ◽  
Author(s):  
A. Ali Beck ◽  
T. Boesel ◽  
I. M. Seppelt
Keyword(s):  
Maintenance Phase ◽  
Low Flow ◽  
Low Flow Anaesthesia

Low-flow anaesthesia does not increase the risk of microbial contamination through the circle absorber system

1989 ◽  
Vol 33 (1) ◽  
pp. 89-92 ◽  
Author(s):  
J. P. BENGTSON ◽  
A. BRANDBERG ◽  
B. BRINKHOFF ◽  
H. SONANDER ◽  
O. STENQVIST
Keyword(s):  
Microbial Contamination ◽  
Low Flow ◽  
Low Flow Anaesthesia ◽  
Circle Absorber

Effect of Fresh Gas Flow on Isoflurane Concentrations during Low-flow Anaesthesia

2005 ◽  
Vol 33 (5) ◽  
pp. 513-519 ◽  
Author(s):  
J-Y Park ◽  
J-H Kim ◽  
W-Y Kim ◽  
M-S Chang ◽  
J-Y Kim ◽  
...  
Keyword(s):  
Gas Flow ◽  
Low Flow ◽  
Physical Status ◽  
Closed Circle ◽  
Haemodynamic Changes ◽  
Low Flow Anaesthesia ◽  
Baseline Values ◽  
American Society ◽  
End Tidal ◽  
Closed Circle System

The effect of fresh gas flow (FGF) on isoflurane concentrations at given vaporizer settings during low-flow anaesthesia was investigated. Ninety patients (American Society of Anaesthesiologists physical status I or II) were randomly allocated to three groups (FGF 1 l/min, FGF 2 l/min and FGF 4 l/min). Anaesthesia was maintained for 10 min with vaporizer setting isoflurane 2 vol% and FGF 4 l/min for full-tissue anaesthetic uptake in a semi-closed circle system. Low-flow anaesthesia was maintained for 20 min with end-tidal isoflurane 1.5 vol% and FGF 2 l/min. FGF was then changed to FGF 1 l/min, FGF 2 l/min or FGF 4 l/min. Measurements during the 20-min period showed that inspired and end-tidal isoflurane concentrations decreased in the FGF 1-l/min group but increased in the FGF 4-l/min group compared with baseline values. No haemodynamic changes were observed. Monitoring of anaesthetic concentrations and appropriate control of vaporizer settings are necessary during low-flow anaesthesia.

scholarly journals Promoting low-flow anaesthesia and volatile anaesthetic agent choice

2019 ◽  
Vol 8 (3) ◽  
pp. e000479 ◽  
Author(s):  
Louise A Carter ◽  
Molola Oyewole ◽  
Eleanor Bates ◽  
Kate Sherratt
Keyword(s):  
Gas Flow ◽  
Anaesthetic Agent ◽  
Cost Effective ◽  
Low Flow ◽  
Volatile Agent ◽  
Monthly Basis ◽  
Improvement Project ◽  
Effective Manner ◽  
Low Flow Anaesthesia ◽  
Volatile Agents

BackgroundAs doctors, we are increasingly aware of the financial implications of our practice. The need to work in a more conscientious, efficacious and cost-effective manner is greater than ever before. Environmental and financial benefits can be seen through employing the use of low-flow anaesthesia.AimsThis quality improvement project aimed to make anaesthetic practice more environmentally friendly and to reduce departmental spending. This could be achieved by promoting the use of low-flow anaesthesia and by encouraging isoflurane use where appropriate.MethodsAll anaesthetic consultants and trainees were invited to fill out an initial questionnaire relating to their personal preferences and practices when conducting anaesthesia. There were specific questions relating to low-flow anaesthesia and isoflurane use. Our main measure of improvement was any decrease in the number of bottles of volatile agent ordered by the department from pharmacy. Monthly spot audits were conducted to assess gas flow rates and volatile agent use in theatre. Departmental spending figures relating to the purchase of volatile agent bottles were obtained from pharmacy. Information was then disseminated to anaesthetists on a monthly basis via a ‘low-flow board’, which showed pictorial and graphical representations of differing gas flows and volatile agent usage in relation to cost.ResultsOur project showed a trend for the increased use of low-flow anaesthesia within the department. We also showed a decrease in the number of bottles of volatile agent ordered: 18% fewer bottles ordered compared with the same period the previous year. This represented a 25% decrease in total departmental expenditure on volatile agents despite an increase in theatre activity.ConclusionIncreasing awareness regarding anaesthetic choices and promoting low-flow anaesthesia and isoflurane use, translated into an overall decreased departmental spend on volatile agents without affecting patient care.

scholarly journals Cost-effectiveness of Basal Flow Sevoflurane Anaesthesia Using the Komesaroff Vaporizer inside the Circle System

2005 ◽  
Vol 33 (5) ◽  
pp. 609-615 ◽  
Author(s):  
S. P. Nandalan ◽  
R. J. Eltringham ◽  
Q. W. Fan
Keyword(s):  
Gas Flow ◽  
Low Flow ◽  
Gas Flows ◽  
Physical Status ◽  
Mechanically Ventilated ◽  
Sevoflurane Anaesthesia ◽  
Inspiratory Limb ◽  
Low Flow Anaesthesia ◽  
Induction Of Anaesthesia ◽  
Basal Flow

After ethics committee approval, 51 consenting ASA physical status 1 or 2 adult patients were given basal flow sevoflurane anaesthesia using fresh gas flows of 150 to 300 ml.min-1 oxygen. A Komesaroff vaporizer was placed on the inspiratory limb of the circle system. Basal flows were introduced immediately following intravenous induction of anaesthesia. The vaporizer was set to deliver the maximum concentration until the inspired sevoflurane concentration (FSI) reached 3%. The dial was then adjusted to maintain the FSI at 3%. After every 60 minutes, the circuit was washed out with 100% oxygen at a flow rate of 10 l.min-1 for one minute. The FSI reached 3% after an average of 8.5 (3.8) [mean (SD)] minutes. The trends in FSI and the expired sevoflurane concentrations were significantly different (P<0.05) between the mechanically ventilated patients (n=21) and the spontaneously ventilating patients (n=30) and demonstrated a more gradual build-up in the former group. The consumption of sevoflurane was found to be 9.2 (2.8) ml.h-1. This represented a 52.5% cost saving over the clinical application of the Mapleson's ideal fresh gas flow sequence for low-flow anaesthesia.

Measurement of systemic oxygen uptake during low-flow anaesthesia with a standard technique vs. a novel method

Anaesthesia ◽  
2002 ◽  
Vol 57 (7) ◽  
pp. 654-658 ◽  
Author(s):  
I. E. Leonard ◽  
B. Weitkamp ◽  
K. Jones ◽  
J. Aittomaki ◽  
P. S. Myles
Keyword(s):  
Oxygen Uptake ◽  
Standard Technique ◽  
Low Flow ◽  
Low Flow Anaesthesia ◽  
Novel Method ◽  
Systemic Oxygen

Low-flow anaesthesia systems, charcoal and isoflurane kinetics

Anaesthesia ◽  
1992 ◽  
Vol 47 (12) ◽  
pp. 1098-1098 ◽  
Author(s):  
E. Romano ◽  
M. Pegoraro ◽  
A. Vacri ◽  
C. Pecchiari ◽  
E. Auci
Keyword(s):  
Low Flow ◽  
Low Flow Anaesthesia
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