“Continuous capnography should be used in all anaesthetised patients, regardless of the airway device used or the location of the patient.” That was the first of four recommendations the Association of Anaesthetists of Great Britain and Ireland set out in May 2011, in a short safety statement addressing a specific gap. Capnography, the continuous monitoring of exhaled carbon dioxide, had become close to routine inside operating theatres by then. Outside them, in recovery bays, intensive care units and emergency departments, it was not.
Why the AAGBI revisited capnography in 2011
The statement updated two of the Association’s own earlier publications: the fourth edition of “Recommendations for standards of monitoring during anaesthesia and recovery” from 2007, and a narrower 2009 paper titled “Capnography outside the operating room.” It was written in direct response to two documents that had just appeared. The first was the 2010 International Consensus Guidelines on Cardiopulmonary Resuscitation. The second, and the more consequential of the two, was the Fourth National Audit Project, or NAP4, a joint publication of the Royal College of Anaesthetists and the Difficult Airway Society, released in March 2011 and covering major complications of airway management across the United Kingdom.
At three pages, the statement is short, even by the standards of professional safety guidance. It does not try to be a comprehensive monitoring standard on its own; it exists to close one specific, newly documented gap, and it says so plainly in its opening lines.
What the national audit found
NAP4 is what gives the statement its urgency, and its numbers are stark. At least one in four of the major airway complications the audit captured occurred outside the operating theatre, in an intensive care unit or an emergency department. More than 60% of the airway events recorded in ICUs led to death or brain damage. Within that group, the absence of capnography, or its incorrect use, was judged to have contributed to 80% of ICU airway-complication deaths and 50% of those in emergency departments.
The audit traced the pattern to two recurring, preventable causes. One was an unrecognised esophageal intubation: the breathing tube had gone down the wrong pipe, and nobody caught it in time. The other was a tracheal or tracheostomy tube that had shifted out of position after a patient was moved, treated, or transported between wards, again without being noticed before harm occurred. Capnography, in both cases, is the check that would have flagged the problem within seconds rather than minutes.
Those two findings gave the statement a clarity that earlier guidance had lacked. It was no longer arguing in the abstract that monitoring “outside the operating theatre” mattered; it could point to a specific national dataset showing exactly where, and how often, its absence had cost lives. Medical-device manufacturers took note too. Product pages for capnography accessories, including sampling masks and nasal cannulae designed for use outside theatres, began citing the statement’s recommendations directly, using the AAGBI’s clinical authority to explain why a hospital buying such equipment would need it in the first place — a small but telling sign of how quickly the 2011 statement moved from professional guidance into purchasing decisions.
The four recommendations
Against that backdrop, the statement sets out four numbered recommendations, and they are written to leave little room for local interpretation. Continuous capnography should be used in all anaesthetised patients, wherever they are in the hospital and whatever airway device is in use. It should be used for every patient whose trachea is intubated, again regardless of location, with a stated exception for tracheostomy patients who are breathing on their own. It should be used for every patient undergoing moderate or deep sedation, and should remain available throughout their recovery. And it should be used for every patient receiving advanced life support.
The statement borrows its definitions of “moderate” and “deep” sedation from the American Society of Anesthesiologists’ continuum-of-sedation framework, approved in 2004 and amended in 2009, rather than drafting new thresholds of its own. If you are reading the 2011 text closely, that borrowing is a small tell about how the AAGBI worked: it preferred to anchor its own rules to an existing, already-agreed clinical standard wherever one was available.
One detail sits slightly apart from the main argument, and it is worth keeping. The statement notes, almost in passing, that capnography was “not yet standard on resuscitation trolleys” in 2011, even though some defibrillators on the market already had the capability built in. The technology, in other words, had arrived in hospitals before hospital-wide practice had caught up to it. Six numbered references anchor the statement’s claims, including the 2010 Resuscitation Council (UK) guidelines and the NAP4 report itself.
What changed since 2011
The Association of Anaesthetists, as it is now named, has since replaced the underlying monitoring standards this statement was built on top of. “Recommendations for standards of monitoring during anaesthesia and recovery 2021,” published in the journal Anaesthesia by Klein and colleagues, formally updates and replaces the fifth edition of those standards from 2015, and carries its own capnography provisions written for current practice.
The Association’s own archive now labels the 2011 capnography statement “ARCHIVE.” That is not an accident of filing; it is the organisation’s own signal that the document is kept for the historical record, not as a live clinical instruction. Read today, it is best understood as a snapshot of what a professional body recommended in the year immediately after one specific national audit changed what was known about where airway deaths were actually happening.
Ten years, in monitoring-standards terms, is a long gap. The 2021 update did not simply restate the 2011 recommendations; it folded capnography guidance back into a single, comprehensive monitoring standard covering anaesthesia and recovery as a whole, rather than treating “outside the operating theatre” as a separate problem requiring its own standalone statement. That structural choice is itself a small piece of evidence about how far routine practice had shifted in the decade between the two documents.