History of Anaesthesia

The management of surgical pain before the 1840s relied on a range of palliative measures rather than true anaesthesia — the medically induced loss of consciousness with concurrent suppression of protective reflexes. Alcohol and opiates were common, and physical restraint was routine. Cold, compression, and hypnosis (then called mesmerism) were all explored, none with consistent results. A 15th-century compound known as dwale — containing bile, hemlock, henbane, opium, and vinegar — illustrates how far practitioners were willing to go, and how dangerous the alternatives were. (Prioreschi, BMJ, 2002)

The consequences shaped the entire field. Surgeons built their reputations on speed. Robert Liston of Edinburgh, the most celebrated operator of his generation, became legendary for amputations completed in under a minute — not as a performance, but as a merciful necessity. Longer operations, requiring deep internal access or sustained tissue manipulation, were effectively foreclosed. Speed was not a virtue; it was the only available kindness. (Hollingham, Surgery: The Ultimate Reality, cited in NCBI Bookshelf)

Understanding this context is essential for grasping what the discoveries of the 1840s actually changed. Anaesthesia did not simply improve patient comfort. It dismantled the primary constraint on surgical ambition, granting surgeons something they had never before possessed: time.

Horace Wells, a dentist, first administered nitrous oxide for a tooth extraction in December 1844, after observing at a travelling exhibition that a man who had injured himself under the gas showed no sign of pain. He began using it in his own practice and, convinced he had solved the problem of dental suffering, sought a wider stage. (Desai & Desai, Journal of the History of Dentistry, 2013)

On 20 January 1845, Wells demonstrated the technique before an audience of Harvard medical students and faculty. The patient cried out. The dose had been misjudged — possibly the gas had not been administered long enough, possibly the patient was simply excitable — but the outcome was catastrophic regardless. The audience responded with derision. Wells withdrew from practice, developed a serious addiction to chloroform, and died by suicide in 1848, months after the Paris Medical Society had finally begun to recognise his priority. (Desai & Desai, 2013; Hogue & Gravenstein, Anesthesiology, 1993)

The episode established a principle that would govern the adoption of every subsequent anaesthetic: a new technique required not merely private success but a successful, reproducible public demonstration before a credible audience. Wells had the right substance and the right idea. What he lacked was a single unimpeachable public moment — and the absence of it cost him everything.

William T. G. Morton, a dentist and part-time medical student, had been experimenting with sulphuric ether and arranged a demonstration before John Collins Warren, one of Boston’s leading surgeons. On 16 October 1846, Morton administered ether vapour to Edward Gilbert Abbott, and Warren excised a tumour from his neck. Abbott reported feeling nothing. Warren turned to the watching students and said, in a phrase that became medical shorthand for the entire event: “Gentlemen, this is no humbug.” (Fenster, JAMA Surgery, 2023)

Henry Jacob Bigelow published the first formal account of the procedure in the Boston Medical and Surgical Journal on 18 November 1846, under the title “Insensibility During Surgical Operations Produced by Inhalation.” His report — including a case series of four operations — gave the discovery its clinical foundation and remains one of the most consequential papers in the history of surgery. (Fenster, Annals of Surgery Open, 2022)

News crossed the Atlantic rapidly. On 19 December 1846, Dr James Robinson in London used ether for a dental extraction. Two days later, Robert Liston — the same surgeon whose speed had been the only available mercy in the pre-anaesthetic era — performed a painless amputation under ether at University College Hospital. He reportedly told his students afterwards: “This Yankee dodge beats mesmerism hollow.” (Ellis, The introduction of ether anaesthesia to Great Britain, Mayo Clinic History)

John Snow, already emerging as a systematic thinker about disease and public health, immediately recognised that ether demanded rigorous physiological understanding. By late 1846 he had designed his own ether inhaler and begun the careful dose-response observations that would eventually make him the most trusted anaesthetist in Britain. (Sykes, Anaesthesia, 1976)

Some surgeons resisted. Objections included the claim that ether suppressed the patient’s “vitality” and might worsen already appalling mortality rates. The clinical evidence accumulated quickly, however, and within months the resistance had largely dissolved in the face of outcomes that were simply undeniable.

James Young Simpson, a Glasgow-trained obstetrician then holding the Chair of Midwifery at Edinburgh, was searching for an alternative to ether more suitable for childbirth. In November 1847, he and two colleagues inhaled chloroform in his dining room and were discovered unconscious on the floor. Satisfied with the result, Simpson introduced it into his obstetric practice almost immediately. (Shephard, Journal of the Royal College of Physicians of Edinburgh, 2011)

Chloroform’s social acceptance was accelerated by a single high-profile event. On 7 April 1853, John Snow administered it to Queen Victoria during the birth of Prince Leopold. Victoria described the effect as “soothing, quieting and delightful beyond measure.” The royal endorsement effectively closed the theological debate — some clergy had argued that pain in childbirth was divinely ordained — and normalised obstetric anaesthesia for a generation of patients. (Caton, Anesthesiology, 2000)

The first death directly attributed to chloroform occurred in January 1848, less than three months after Simpson’s introduction of the drug. Hannah Greener, a healthy 15-year-old girl, died during a minor elective procedure to remove an ingrowing toenail at Winlaton, County Durham. Her collapse was abrupt and unexplained. The attending surgeon attempted resuscitation with brandy and cold water, to no effect. (Knight & Bacon, Anaesthesia, 2002)

Greener’s death opened a prolonged period of medical anxiety. More than fifty fatalities associated with chloroform appeared in the literature within the first decade of its use. John Snow, compiling the first fifty known deaths for his 1858 posthumous treatise On Chloroform and Other Anaesthetics, found that in 46 of those cases the patient had died before the surgery had even begun — during induction alone. The quantified risk was stark: deaths from ether ran at approximately 1 in 25,000; deaths from chloroform ran substantially higher. (Duncum, Proceedings of the Royal Society of Medicine, 1974)

The British Medical Association formed a Special Chloroform Committee to investigate. Its inquiries continued intermittently for over half a century, with major reports issued in 1893 and 1901. The committee’s work represents one of the earliest examples of a professional medical body attempting systematic evidence gathering in response to a drug-safety crisis. (British Medical Association, Final Report of the Special Chloroform Committee, JSTOR)

Joseph Lister’s introduction of carbolic acid antisepsis from 1865 onwards fundamentally altered the ecology of the operating wound. His 1867 papers in The Lancet reported a compound fracture series in which 11 of 13 patients survived — outcomes that would have been unthinkable in pre-Listerian wards, where post-operative infection routinely made major internal surgery a near-certain death sentence. (Worboys, Notes and Records of the Royal Society, 2013)

The interaction between the two innovations was more than additive. Anaesthesia permitted the slow, deliberate dissection that Listerian antisepsis demanded: careful application of carbolic spray, meticulous wound management, extended operative time. Simultaneously, the reduction of fatal post-operative infection made the risks of anaesthesia itself more acceptable, since patients were far less likely to die from secondary complications that had previously made any complex procedure a near-certain loss. (Tan & Tatsumura, Singapore Medical Journal, cited in The Microbiologist)

Robert Liston, whose career had bridged both eras, exemplifies the shift. A surgeon who had treated speed as an ethical imperative could now take his time, adopt aseptic technique, and produce outcomes that would have seemed fantastical to his pre-anaesthetic self. The operating theatre of the 1880s was not simply the theatre of the 1840s with better drugs. It was an entirely different kind of institution.

This transformation shaped the physical design of operating rooms. Late-nineteenth-century theatres were purpose-built for controlled conditions: large windows for natural light, ventilation capable of managing anaesthetic vapours, surfaces amenable to cleaning, and spatial arrangements that could accommodate the new division of labour between surgeon, anaesthetist, and nursing staff. The architecture encoded the new medicine. (Bhatt et al., Patient Safety in Surgery, 2025)

John Snow was the pivotal figure of the first generation. Where other practitioners used chloroform by feel, Snow approached it as a physiologist. He documented the stages of anaesthesia, correlated dose with clinical signs, and designed equipment to improve consistency of delivery. His two major works — On the Inhalation of the Vapour of Ether (1847) and the posthumously published On Chloroform and Other Anaesthetics (1858) — established that anaesthesia was a complex pharmacological intervention requiring continuous monitoring, not a simple act of applying a substance. (Wawersik, Acta Anaesthesiologica Scandinavica, cited in PMC, 2022)

In the United States, academic legitimisation came through institutional appointment. Henry Jacob Bigelow championed anaesthesia within the Harvard medical establishment, and the eventual establishment of the first university chair in anaesthesiology at Harvard institutionalised the field within academic medicine and guaranteed its place in medical education. (Beecher & Todd, Annals of Surgery, discussed in PMC, 2015)

The formation of professional societies, certification examinations, and national training standards followed across the late nineteenth and early twentieth centuries. The Department of Anesthesiology at the Mayo Clinic, which celebrated its centennial in 2024, represents one marker of how far the specialty had travelled: from an unregulated adjunct to a discipline with its own research programmes, subspecialties, and professional ethics. (Mayo Clinic, Department of Anesthesiology centennial, 2024)

The monitoring practices now considered universal — pulse oximetry, capnography, continuous blood pressure measurement — are the direct descendants of Snow’s bedside observations. He watched respiration depth, skin colour, and muscle tone; modern anaesthesiology has mechanised and extended those same observations into continuous electronic surveillance. The concern is identical. The technology has changed beyond recognition. (Ehrenwerth & Eisenkraft, Monitoring in Anesthesia and Perioperative Care, Cambridge University Press)