Evaluation Of Nitrous Oxide In The Gas Mixture For Anaesthesia: A Randomised Controlled Trial (The ENIGMA Trial)
Funder
National Health and Medical Research Council
Funding Amount
$490,125.00
Summary
There are about 2 million anaesthetics given each year in Australia (1:10 Australians), with more than 1 million Australians being exposed to nitrous oxide (laughing gas). Despite being around for more than 150 years, there has yet to be a large trial of the safety and benefits of nitrous oxide, particularly when compared with newer (safer?) anaesthetic drugs. Nitrous oxide is not a particularly strong anaesthetic and so it must be mixed with other drugs. Current practice in Australia and around ....There are about 2 million anaesthetics given each year in Australia (1:10 Australians), with more than 1 million Australians being exposed to nitrous oxide (laughing gas). Despite being around for more than 150 years, there has yet to be a large trial of the safety and benefits of nitrous oxide, particularly when compared with newer (safer?) anaesthetic drugs. Nitrous oxide is not a particularly strong anaesthetic and so it must be mixed with other drugs. Current practice in Australia and around the world is to give 70% nitrous oxide in oxygen along with another anaesthetic gas in order to produce a depth of anaesthesia sufficient for surgery. This is despite knowledge that nitrous oxide interferes with the production of DNA. DNA is used to programme cell division and function - it is the building block of cell and tisue growth. It is known that nitrous oxide can impair some tissue functions, such that anaemia and, possibly birth defects can occur. Such effects are rare, but recent evidence suggests that milder abnormalities may occur more commonly than previously thought. There is also good evidence that nitrous oxide increases the risk of severe nausea and vomiting after surgery. The adverse effects on DNA production raises the possibility of nitrous oxide causing immune deficiency, heart ischaemia, (angina), nerve and spinal cord damage, and increased cancer risk in hospital staff chronically exposed to low levels of nitrous oxide. The prevailing view is that nitrous oxide is a cheap, relatively safe drug that can reduce the exposure to other anaesthetic drugs. However, the development of many new anaesthetic drugs demands a re-evaluation of the role of nitrous oxide in current anaesthetic practice.Read moreRead less
PREOPERATIVE RISK FACTORS, ADVERSE OUTCOMES AND EFFECTS OF EPIDURAL AND SPINAL ANAESTHESIA
Funder
National Health and Medical Research Council
Funding Amount
$66,110.00
Summary
Anaesthesia and major surgery in patients with coexisting important medical problems present a major challenge to health professionals to avoid and minimise life threatening complications of such surgery. Accurate prediction of which patients are likely to fare badly, and therefore need more intensive peri-operative care and supervision, and knowing definitively whether epidural techniques really do improve the outcome of surgery are issues of central importance in the practice of anaesthesia. P ....Anaesthesia and major surgery in patients with coexisting important medical problems present a major challenge to health professionals to avoid and minimise life threatening complications of such surgery. Accurate prediction of which patients are likely to fare badly, and therefore need more intensive peri-operative care and supervision, and knowing definitively whether epidural techniques really do improve the outcome of surgery are issues of central importance in the practice of anaesthesia. Providing clear answers to both questions requires careful analysis of large amounts of data in which systematic and random errors have been minimised. Databases from well-designed and supervised clinical trials represent an invaluable resource in this regard because they have been compiled through the rigorous application of unambiguous definitions and protocols during the process of recording, coding and entering the information. By bringing together the resources and expertise of the MASTER Trial group and the Collaborative Overview of Randomised of Trials of Regional Anaesthesia (CORTRA), both of which are major international projects led from the Australasian region, we have a unique opportunity to provide exceptionally robust answers to some of the most challenging issues in anaesthesia. The combined study of two large international databases will provide a more precise quantitative analysis of the components of preoperative risk and their relationship to life threatening post operative complications, and the possible role of epidural and spinal anaesthesia in minimising risk by reducing the frequency of these complications.Read moreRead less