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File:Southworth & Hawes - First etherized operation (re-enactment).jpg
Re-enactment of the first public demonstration of general anesthesia by William T. G. Morton on October 16, 1846 in the Ether Dome at Massachusetts General Hospital, Boston. Surgeons John Collins Warren and Henry Jacob Bigelow are included in this daguerrotype by Southworth & Hawes.

Attempts at producing a state of general anesthesia can be traced throughout recorded history in the writings of the ancient Sumerians, Babylonians, Assyrians, Egyptians, Greeks, Romans, Indians, and Chinese. During the Middle Ages, the scientific culture withered in Europe, but fortunately this period coincided with the Islamic Golden Age, a time when medieval Islamic science flourished. Islamic physicians and other Eastern scholars maintained and advanced the practice of medicine in the Arab World during that period.

The European Renaissance saw significant advances in anatomy and surgical technique. However, despite all this progress, surgery remained a treatment of last resort. Largely because of the associated pain, many patients with surgical disorders chose certain death rather than undergo surgery. Although there has been a great deal of debate as to who deserves the most credit for the discovery of general anesthesia, it is generally agreed that certain scientific discoveries in the late 18th and early 19th centuries were critical to the eventual introduction and development of modern anesthetic techniques.

Two "quantum leaps" occurred in the late 19th century, which together allowed the transition to modern surgery. An appreciation of the germ theory of disease led rapidly to the development and application of antiseptic techniques in surgery. Antisepsis, which soon gave way to asepsis, reduced the overall morbidity and mortality of surgery to a far more acceptable rate than in previous eras. Concurrent with these developments were the significant advances in pharmacology and physiology which led to the development of general anesthesia and the control of pain.

In the 20th century, the safety and efficacy of general anesthesia was improved by the routine use of tracheal intubation and other advanced airway management techniques. Significant advances in monitoring and new anesthetic agents with improved pharmacokinetic and pharmacodynamic characteristics also contributed to this trend. Finally, standardized training programs for anesthesiologists and nurse anesthetists emerged during this period.

Etymology of "anesthesia"

The word "anesthesia", coined by Oliver Wendell Holmes, Sr. (1809–1894) in 1846 from the Greek αν-, an-, "without"; and αἴσθησις, aisthēsis, "sensation"),[1] refers to the inhibition of sensation.

Antiquity

The first attempts at general anesthesia were probably herbal remedies administered in prehistory. Alcohol is the oldest known sedative; it was used in ancient Mesopotamia thousands of years ago.[2]

Opium

File:Illustration Papaver somniferum0.jpg
Opium poppy, Papaver somniferum

It has long been written that the Sumerians cultivated and harvested the opium poppy (Papaver somniferum) in lower Mesopotamia as early as 3400 BC,[3][4] though this has been disputed.[5] The most ancient testimony concerning the opium poppy found to date was inscribed in cuneiform script on a small white clay tablet at the end of the third millennium BC. This tablet was discovered in 1954 during excavations at Nippur, and is currently kept at the University of Pennsylvania Museum of Archaeology and Anthropology. Deciphered by Samuel Noah Kramer and Martin Leve, it is considered to be the most ancient pharmacopoeia in existence.[6][7] Some Sumerian tablets of this era have an ideogram inscribed upon them, "hul gil", which translates to "plant of joy", believed by some authors to refer to opium.[8][9] The term gil is still used for opium in certain parts of the world.[10] The Sumerian goddess Nidaba is often depicted with poppies growing out of her shoulders. Circa 2225 BC, the Sumerian territory became a part of the Babylonian empire. Knowledge and use of the opium poppy and its euphoric effects thus passed to the Babylonians, who expanded their empire eastwards to Persia and westwards to Egypt, thereby extending its range to these civilizations.[10] British archaeologist and cuneiformist Reginald Campbell Thompson writes that opium was known to the Assyrians in the seventh century BC.[11] The term "Arat Pa Pa" occurs in the Assyrian Herbal, a collection of inscribed Assyrian tablets dated to circa 650 BC. According to Thompson, this term is the Assyrian name for the juice of the poppy and it may be the etymological origin of the Latin "papaver".[8]

The ancient Egyptians were known to have had some surgical instruments,[12][13] as well as certain crude analgesics and sedatives, including possibly an extract prepared from the mandrake fruit.[14] The use of preparations similar to opium in surgery is recorded in the Ebers Papyrus, an Egyptian medical papyrus written in the Eighteenth dynasty.[10][12][15] However, it is questionable whether opium itself was known in ancient Egypt at that time.[16] The Greek gods Hypnos (Sleep), Nyx (Night), and Thanatos (Death) were often depicted holding poppies.[17]

Prior to the introduction of opium to ancient India and China, these civilizations pioneered the use of cannabis incense and aconitum. Circa 400 BC, the Sushruta Samhita (a text from the Indian subcontinent on ayurvedic medicine and surgery) advocates the use of wine with incense of cannabis for anesthesia.[18] By the eighth century AD, Arab traders had brought opium to India[19] and China.[20]

China

File:HuaTuo.jpg
Hua Tuo, Chinese surgeon, circa AD 200

Bian Que (Chinese: 扁鹊, Wade–Giles: Pien Ch'iao, ca. 300 BC) was a legendary Chinese internist and surgeon who reportedly used general anesthesia for surgical procedures. It is recorded in the Book of Master Han Fei (ca. 250 BC), the Records of the Grand Historian (ca. 100 BC), and the Book of Master Lie (ca. AD 300) that Bian Que gave two men, named "Lu" and "Chao", a toxic drink which rendered them unconscious for three days, during which time he performed a gastrotomy upon them.[21][22][23]

Hua Tuo (華, ca. AD 145-220) was a Chinese surgeon of the second century AD. According to the Records of Three Kingdoms (ca. AD 270) and the Book of the Later Han (ca. AD 430), Hua Tuo performed surgery under general anesthesia using a formula he had developed by mixing wine with a mixture of herbal extracts he called mafeisan (麻沸散).[24] Hua Tuo reportedly used mafeisan to perform even major operations such as resection of gangrenous intestines.[24][25][26] Before the surgery, he administered an oral anesthetic potion, probably dissolved in wine, in order to induce a state of unconsciousness and partial neuromuscular blockade.[24]

The exact composition of mafeisan, similar to all of Hua Tuo's clinical knowledge, was lost when he burned his manuscripts, just before his death.[27] The composition of the anesthetic powder was not mentioned in either the Records of Three Kingdoms or the Book of the Later Han. Because Confucian teachings regarded the body as sacred and surgery was considered a form of body mutilation, surgery was strongly discouraged in ancient China. Because of this, despite Hua Tuo's reported success with general anesthesia, the practice of surgery in ancient China ended with his death.[24]

The name mafeisan combines ma (麻, meaning "cannabis, hemp, numbed or tingling"), fei (沸, meaning "boiling or bubbling"), and san (散, meaning "to break up or scatter", or "medicine in powder form"). Therefore, the word mafeisan probably means something like "cannabis boil powder". Many sinologists and scholars of traditional Chinese medicine have guessed at the composition of Hua Tuo's mafeisan powder, but the exact components still remain unclear. His formula is believed to have contained some combination of:[24][27][28][29]

Others have suggested the potion may have also contained hashish,[25] bhang,[26] shang-luh,[21] or opium.[30] Victor H. Mair wrote that mafei "appears to be a transcription of some Indo-European word related to "morphine"."[31] Some authors believe that Hua Tuo may have discovered surgical analgesia by acupuncture, and that mafeisan either had nothing to do with or was simply an adjunct to his strategy for anesthesia.[32] Many physicians have attempted to re-create the same formulation based on historical records but none have achieved the same clinical efficacy as Hua Tuo's. In any event, Hua Tuo's formula did not appear to be effective for major operations.[31][33]

Other substances used from antiquity for anesthetic purposes include extracts of juniper and coca.[34][35][36]

Middle Ages and Renaissance

File:IbnSina-Dushanbe.jpg
Statue of Ibn Sīnā in Dushanbe, Tajikistan

Arabic and Persian physicians may have been among the first to utilize oral as well as inhaled anesthetics. Ferdowsi (940–1020) was a Persian poet who lived in the Abbasid Caliphate. In Shahnameh, his national epic poem, Ferdowsi described a caesarean section performed on Rudaba.[citation needed] A special wine prepared by a Zoroastrian priest was used as an anesthetic for this operation.[21] Although Shahnameh is fictional, the passage nevertheless supports the idea that general anesthesia had at least been described in ancient Persia, even if not successfully implemented.

In 1000, Abu al-Qasim al-Zahrawi (936-1013), an Arab physician who lived in Al-Andalus, published the 30-volume Kitab al-Tasrif, the first illustrated work on surgery.[citation needed] In this book, he wrote about the use of general anesthesia for surgery. Circa 1020, Ibn Sīnā (980–1037) described the use of inhaled anesthesia in The Canon of Medicine.[citation needed] The Canon described the "soporific sponge", a sponge imbued with aromatics and narcotics, which was to be placed under a patient's nose during surgical operations.[37] Ibn Zuhr (1091–1161) was another Arab physician from Al-Andalus. In his 12th century medical textbook Al-Taisir, Ibn Zuhr describes the use of general anesthesia.[citation needed] These three physicians were among many who performed operations under inhaled anesthesia with the use of narcotic-soaked sponges.[38][39] Opium made its way from Asia Minor to all parts of Europe between the tenth and thirteenth centuries.[40]

Aureolus Theophrastus Bombastus von Hohenheim (1493-1541), better known as Paracelsus, discovered the analgesic properties of diethyl ether around 1525.[41] August Siegmund Frobenius gave the name aether to the substance in 1730.[citation needed] Diethyl ether was first synthesized in 1540 by Valerius Cordus, who noted some of its medicinal properties.[citation needed] He called it oleum dulce vitrioli, a name that reflects the fact that it is synthesized by distilling a mixture of ethanol and sulfuric acid (known at that time as oil of vitriol).

18th century

File:Royal Institution - Humphry Davy.jpg
Satirical cartoon by James Gillray showing a Royal Institution lecture, with Humphry Davy holding the bellows and Count Rumford looking on at extreme right.

Joseph Priestley (1733–1804) was an English polymath who discovered nitrous oxide, nitric oxide, ammonia, hydrogen chloride and (along with Carl Wilhelm Scheele and Antoine Lavoisier) oxygen. Beginning in 1775, Priestley published his research in Experiments and Observations on Different Kinds of Air, a six-volume work.[42] The recent discoveries about these and other gases stimulated a great deal of interest in the European scientific community. Thomas Beddoes (1760–1808) was an English philosopher, physician and teacher of medicine, and like his older colleague Priestley, was also a member of the Lunar Society of Birmingham. With an eye toward making further advances in this new science as well as offering treatment for diseases previously thought to be untreatable (such as asthma and tuberculosis), Beddoes founded the Pneumatic Institution for inhalation gas therapy in 1798 at Dowry Square in Clifton, Bristol.[43] Beddoes employed chemist and physicist Humphry Davy (1778–1829) as superintendent of the institute, and engineer James Watt (1736–1819) to help manufacture the gases. Other members of the Lunar Society such as Erasmus Darwin and Josiah Wedgwood were also actively involved with the institute.

During the course of his research at the Pneumatic Institution, Davy discovered the anesthetic properties of nitrous oxide.[44] Davy, who coined the term "laughing gas" for nitrous oxide, published his findings the following year in the now-classic treatise, Researches, chemical and philosophical–chiefly concerning nitrous oxide or dephlogisticated nitrous air, and its respiration. Davy was not a physician, and he never administered nitrous oxide during a surgical procedure. He was however the first to document the analgesic effects of nitrous oxide, as well as its potential benefits in relieving pain during surgery:[45]
"As ni­trous oxide in its extensive operation appears capable of destroying physical pain, it may probably be used with advantage during surgical operations in which no great effusion of blood takes place."

19th century

Japan

File:HanaokaSeishu.gif
Hanaoka Seishū, Japanese surgeon of the 18th and 19th centuries

Hanaoka Seishū (華岡 青洲, 1760–1835) of Osaka was a Japanese surgeon of the Edo period with a knowledge of Chinese herbal medicine, as well as Western surgical techniques techniques he had learned through Rangaku (literally "Dutch learning", and by extension "Western learning"). Beginning in about 1785, Hanaoka embarked on a quest to re-create a compound that would have pharmacologic properties similar to Hua Tuo's mafeisan.[46] After years of research and experimentation, he finally developed a formula which he named tsūsensan (also known as mafutsu-san). Like that of Hua Tuo, this compound was composed of extracts of several different plants, including:[47][48][49]

  • 2 parts bai zhi (Angelica dahurica);
  • 2 parts cao wu (Aconitum sp., monkshood or wolfsbane);
  • 2 parts chuān ban xia (Pinellia ternata);
  • 2 parts chuān xiōng (Ligusticum wallichii, Cnidium rhizome, Cnidium officinale or Szechuan lovage);
  • 2 parts dong quai (Angelica sinensis or female ginseng);
  • 1 part tian nan xing (Arisaema rhizomatum or cobra lily)
  • 8 parts yang jin hua (Datura stramonium, Korean morning glory, thorn apple, jimson weed, devil's trumpet, stinkweed, or locoweed).

The reader will note that five of these seven ingredients were thought to be elements of Hua Tuo's anesthetic potion, 1600 years earlier. Some sources claim that Angelica archangelica (often referred to as garden angelica, holy ghost, or wild celery) was also an ingredient.

The active ingredients in tsūsensan are scopolamine, hyoscyamine, atropine, aconitine and angelicotoxin. When consumed in sufficient quantity, tsūsensan produces a state of general anesthesia and skeletal muscle paralysis.[49] Shutei Nakagawa (1773–1850), a close friend of Hanaoka, wrote a small pamphlet entitled "Mayaku-ko" ("narcotic powder") in 1796. Although the original manuscript was lost in a fire in 1867, this brochure described the current state of Hanaoka's research on general anesthesia.[50]

On 13 October 1804, Hanaoka performed a partial mastectomy for breast cancer on a 60 year old woman named Kan Aiya, using tsūsensan as a general anesthetic. This is generally regarded today as the first reliable documentation of an operation to be performed under general anesthesia.[46][48][51][52] Hanaoka went on to perform many operations using tsūsensan, including resection of malignant tumors, extraction of bladder stones, and extremity amputations. Before his death in 1835, Hanaoka performed more than 150 operations for breast cancer.[46][52][53][54]

Western hemisphere

File:Colton Gardner Q.jpg
Gardner Quincy Colton, 19th century American dentist
File:Wells Horace.jpg
Horace Wells, 19th century American dentist
File:CrawfordLong.jpg
Crawford Long, 19th century American physician
File:WilliamMorton.jpg
William T. G. Morton, 19th century American dentist

Friedrich Sertürner (1783–1841) first isolated morphine from opium in 1806; he named it morphine after Morpheus, the Greek god of dreams.[55][56]

Henry Hill Hickman (1800–1830) experimented with the use of carbon dioxide as an anesthetic in the 1820s. He would make the animal insensible, effectively via almost suffocating it with carbon dioxide, then determine the effects of the gas by amputating one of its limbs. In 1824, Hickman submitted his the results of his research to the Royal Society in a short treatise entitled Letter on suspended animation: with the view of ascertaining its probable utility in surgical operations on human subjects. The response was an 1826 article in The Lancet titled 'Surgical Humbug' that ruthlessly criticised his work. Hickman died four years later at age 30. Though he was unappreciated at the time of his death, his work has since been positively reappraised and he is now recognised as one of the fathers of anesthesia.

By the late 1830s, Humphry Davy's experiments had become widely publicized within academic circles in the northeastern United States. Wandering lecturers would hold public gatherings, referred to as "ether frolics", where members of the audience were encouraged to inhale diethyl ether or nitrous oxide to demonstrate the mind-altering properties of these agents while providing much entertainment to on­lookers.[57] Four notable men participated in these events and witnessed the use of ether in this manner. They were William Edward Clarke (1819–1898), Crawford Long (1815–1878), Horace Wells (1815–1848), and William T. G. Morton (1819–1868).

While attending undergraduate school in Rochester, New York in 1839, classmates Clarke and Morton apparently participated in ether frolics with some regularity.[58][59][60][61] In January 1842, by now a medical student at Berkshire Medical College, Clarke administered ether to a Miss Hobbie, while Elijah Pope performed a dental extraction.[59] In so doing, he became the first to administer an inhaled anesthetic to facilitate the performance of a surgical procedure. Clarke apparently thought little of his accomplishment, and chose neither to publish nor to pursue this technique any further. Indeed, this event is not even mentioned in Clarke's biography.[62]

Crawford Long was a physician and pharmacist practicing in Jefferson, Georgia in the mid-19th century. During his time as a student at the University of Pennsylvania School of Medicine in the late 1830s, he had observed and probably participated in the ether frolics that had become popular at that time. At these gatherings, Long observed that some participants experienced bumps and bruises, but afterward had no recall of what had happened. He postulated that that diethyl ether produced pharmacologic effects similar to those of nitrous oxide. On 30 March 1842, he administered diethyl ether by inhalation to a man named James Venable, in order to remove a tumor from the man's neck.[63] Long later removed a second tumor from Venable, under ether anesthesia. He went on to employ ether as a general anesthetic for limb amputations and parturition. Long however did not publish his experience until 1849, thereby denying himself much of the credit he deserved.[63]

On 10 December 1844, Gardner Quincy Colton held a public demonstration of nitrous oxide in Hartford, Connecticut. One of the participants, Samuel A. Cooley, sustained a significant injury to his leg while under the influence of nitrous oxide without noticing the injury. Horace Wells, a Connecticut dentist present in the audience that day, immediately seized upon the significance of this apparent analgesic effect of nitrous oxide. The following day, Wells underwent a painless dental extraction while under the influence of nitrous oxide administered by Colton. Wells then began to administer nitrous oxide to his patients, successfully performing several dental extractions over the next couple of weeks.

William T. G. Morton, another New England dentist, was a former student and then-current business partner of Wells. He was also a former acquaintance and classmate of William Edward Clarke (the two had attended undergraduate school together in Rochester, New York). Morton arranged for Wells to demonstrate his technique for dental extraction under nitrous oxide general anesthesia at Massachusetts General Hospital, in conjunction with the prominent surgeon John Collins Warren. This demonstration, which took place on 20 January 1845, ended in failure when the patient cried out in pain in the middle of the operation.[64]

On 30 September 1846, Morton administered diethyl ether to Eben Frost, a music teacher from Boston, for a dental extraction. Two weeks later, Morton became the first to publicly demonstrate the use of diethyl ether as a general anesthetic at Massachusetts General Hospital, in what is known today as the Ether Dome.[65] On 16 October 1846, John Collins Warren removed a tumor from the neck of a local printer, Edward Gilbert Abbott. Upon completion of the procedure, Warren reportedly quipped, "Gentlemen, this is no humbug." News of this event rapidly traveled around the world.[66] Morton published his experience that year.[65] Harvard University professor Charles Thomas Jackson (1805–1880) later claimed that Morton stole his idea;[67] Morton disagreed and a lifelong dispute began.[66] For many years, Morton was credited as being the pioneer of general anesthesia in the Western hemisphere, despite the fact that his demonstration occurred four years after Long's initial experience. Long later petitioned William Crosby Dawson (1798–1856), a United States Senator from Georgia at that time, to support his claim on the floor of the United States Senate as the first to use ether anesthesia.[68]

In 1847, Scottish obstetrician James Young Simpson (1811–1870) of Edinburgh was the first to use chloroform as a general anesthetic. The use of chloroform anesthesia expanded rapidly thereafter in Europe. Chloroform began to replace ether as an anesthetic in the United States at the beginning of the 20th century. It was soon abandoned in favor of ether when its hepatic and cardiac toxicity, especially its tendency to cause potentially fatal cardiac dysrhythmias, became apparent.

In 1871, the German surgeon Friedrich Trendelenburg (1844–1924) published a paper describing the first successful elective human tracheotomy to be performed for the purpose of administration of general anesthesia.[69][70][71][72]

In 1880, the Scottish surgeon William Macewen (1848–1924) reported on his use of orotracheal intubation as an alternative to tracheotomy to allow a patient with glottic edema to breathe, as well as in the setting of general anesthesia with chloroform.[73][74][75] All previous observations of the glottis and larynx (including those of Manuel García,[76] Wilhelm Hack[77][78] and Macewen) had been performed under indirect vision (using mirrors) until 23 April 1895, when Alfred Kirstein (1863–1922) of Germany first described direct visualization of the vocal cords. Kirstein performed the first direct laryngoscopy in Berlin, using an esophagoscope he had modified for this purpose; he called this device an autoscope.[79] The death of Emperor Frederick III (1831–1888)[80] may have motivated Kirstein to develop the autoscope.[81]

20th century

File:Hermann Emil Fischer.jpg
Hermann Emil Fischer, German chemist

The 20th century saw the transformation of the practices of tracheotomy, endoscopy and non-surgical tracheal intubation from rarely employed procedures to essential components of the practices of anesthesia, critical care medicine, emergency medicine, gastroenterology, pulmonology and surgery.

In 1902, Hermann Emil Fischer (1852–1919) and Joseph von Mering (1849–1908) discovered that diethylbarbituric acid was an effective hypnotic agent.[82] Also called barbital or Veronal (the trade name assigned to it by Bayer Pharmaceuticals), this new drug became the first commercially marketed barbiturate; it was used as a treatment for insomnia from 1903 until the mid-1950s.

Until 1913, oral and maxillofacial surgery was performed by mask inhalation anesthesia, topical application of local anesthetics to the mucosa, rectal anesthesia, or intravenous anesthesia. While otherwise effective, these techniques did not protect the airway from obstruction and also exposed patients to the risk of pulmonary aspiration of blood and mucus into the tracheobronchial tree. In 1913, Chevalier Jackson (1865–1958) was the first to report a high rate of success for the use of direct laryngoscopy as a means to intubate the trachea.[83] Jackson introduced a new laryngoscope blade that had a light source at the distal tip, rather than the proximal light source used by Kirstein.[84] This new blade incorporated a component that the operator could slide out to allow room for passage of an endotracheal tube or bronchoscope.[85]

Also in 1913, Henry H. Janeway (1873–1921) published results he had achieved using a laryngoscope he had recently developed.[86] An American anesthesiologist practicing at Bellevue Hospital in New York City, Janeway was of the opinion that direct intratracheal insufflation of volatile anesthetics would provide improved conditions for otolaryngologic surgery. With this in mind, he developed a laryngoscope designed for the sole purpose of tracheal intubation. Similar to Jackson's device, Janeway's instrument incorporated a distal light source. Unique however was the inclusion of batteries within the handle, a central notch in the blade for maintaining the tracheal tube in the midline of the oropharynx during intubation and a slight curve to the distal tip of the blade to help guide the tube through the glottis. The success of this design led to its subsequent use in other types of surgery. Janeway was thus instrumental in popularizing the widespread use of direct laryngoscopy and tracheal intubation in the practice of anesthesiology.[81]

Sodium thiopental, the first intravenous anesthetic, was synthesized in 1934 by Ernest H. Volwiler (1893–1992) and Donalee L. Tabern (1900–1974), working for Abbott Laboratories.[87] It was first used in humans on 8 March 1934 by Ralph M. Waters in an investigation of its properties, which were short-term anesthesia and surprisingly little analgesia. Three months later, John Silas Lundy started a clinical trial of thiopental at the Mayo Clinic at the request of Abbott Laboratories. Volwiler and Tabern were awarded U.S. Patent No. 2,153,729 in 1939 for the discovery of thiopental, and they were inducted into the National Inventors Hall of Fame in 1986.

In 1939, the search for a synthetic substitute for atropine culminated serendipitously in the discovery of meperidine, the first opiate with a structure altogether different from that of morphine.[88] This was followed in 1946 by the synthesis of methadone, another structurally unrelated compound with pharmacological properties similar to those of morphine.[89]

After World War I, further advances were made in the field of intratracheal anesthesia. Among these were those made by Sir Ivan Whiteside Magill (1888–1986). Working at the Queen's Hospital for Facial and Jaw Injuries in Sidcup with plastic surgeon Sir Harold Gillies (1882–1960) and anesthetist E. Stanley Rowbotham (1890–1979), Magill developed the technique of awake blind nasotracheal intubation.[90][91][92][93][94][95] Magill devised a new type of angulated forceps (the Magill forceps) that are still used today to facilitate nasotracheal intubation in a manner that is little changed from Magill's original technique.[96] Other devices invented by Magill include the Magill laryngoscope blade,[97] as well as several apparati for the administration of volatile anesthetic agents.[98][99][100] The Magill curve of an endotracheal tube is also named for Magill.

The first hospital anesthesia department was established at the Massachusetts General Hospital in 1936, under the leadership of Henry K. Beecher (1904–1976).[citation needed]

Sir Robert Reynolds Macintosh (1897–1989) achieved significant advances in techniques for tracheal intubation when he introduced his new curved laryngoscope blade in 1943.[101] The Macintosh blade remains to this day the most widely used laryngoscope blade for orotracheal intubation.[102] In 1949, Macintosh published a case report describing the novel use of a gum elastic urinary catheter as an endotracheal tube introducer to facilitate difficult tracheal intubation.[103] Inspired by Macintosh's report, P. Hex Venn (who was at that time the anesthetic advisor to the British firm Eschmann Bros. & Walsh, Ltd.) set about developing an endotracheal tube introducer based on this concept. Venn's design was accepted in March 1973, and what became known as the Eschmann endotracheal tube introducer went into production later that year.[104] The material of Venn's design was different from that of a gum elastic bougie in that it had two layers: a core of tube woven from polyester threads and an outer resin layer. This provided more stiffness but maintained the flexibility and the slippery surface. Other differences were the length (the new introducer was 60 cm (24 in), which is much longer than the gum elastic bougie) and the presence of a 35° curved tip, permitting it to be steered around obstacles.[105][106]

The concept of using a fiberoptic endoscope for tracheal intubation was introduced by Peter Murphy, an English anesthetist, in 1967.[107] By the mid-1980s, the flexible fiberoptic bronchoscope had become an indispensable instrument within the pulmonology and anesthesia communities.[108]

21st century

The "digital revolution" of the 21st century has brought newer technology to the art and science of tracheal intubation. Several manufacturers have developed video laryngoscopes which employ digital technology such as the CMOS active pixel sensor (CMOS APS) to generate a view of the glottis so that the trachea may be intubated. The Glidescope video laryngoscope is one example of such a device.[109][110]

Xenon has been used as a general anesthetic. Although it is expensive, anesthesia machines that can deliver xenon are about to appear on the European market, because advances in recovery and recycling of xenon have made it economically viable.[111]

See also

References

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  1. ↑ Small, MR (1962). Oliver Wendell Holmes. New York: Twayne Publishers. p. 55. ISBN 9780808402374. OCLC 273508. In a letter to dentist William T. G. Morton, Holmes wrote: "Everybody wants to have a hand in a great discovery. All I will do is to give a hint or two as to names—or the name—to be applied to the state produced and the agent. The state should, I think, be called 'Anaesthesia.' This signifies insensibility—more particularly ... to objects of touch." 
  2. ↑ Powell MA (1996). "9: Wine and the vine in ancient Mesopotamia: the cuneiform evidence". In McGovern PE, Fleming SJ, Katz SH. The origins and ancient history of wine (Food and nutrition in history and anthropology). 11 (1 ed.). Amsterdam: Gordon and Breach Publishers. pp. 96–124. ISBN 9789056995522. ISSN 0275-5769. Retrieved 2010-09-15. 
  3. ↑ Neligan AR (1927). The opium question: with special reference to Persia (book review). London: John Bale, Sons and Danielsson, Ltd. pp. 1–2. doi:10.1016/S0035-9203(28)90031-0. Retrieved 2010-09-18. The earliest known mention of the poppy is in the language of the Sumerians, a non-Semitic people who descended from the uplands of Central Asia into Southern Mesopotamia.... 
  4. ↑ Booth M (1996). "The discovery of dreams". Opium: A History. London: Simon & Schuster, Ltd. p. 15. ISBN 0-312-20667-4. Retrieved 2010-09-18. 
  5. ↑ Krikorian AD (1975). "Were the opium poppy and opium known in the ancient Near East?". Journal of the History of Biology. 8 (1): 96–114. PMID 11609871. Retrieved 2010-09-18. 
  6. ↑ Kramer SN (1954). "First pharmacopeia in man's recorded history". Am J Pharm Sci Support Public Health. 126 (3): 76–84. ISSN 0002-9467. PMID 13148318. 
  7. ↑ Kramer SN and Tanaka H (1988). History Begins at Sumer: Thirty-Nine Firsts in Recorded History (3 ed.). Philadelphia: University of Pennsylvania Press. ISBN 978-0812212761. 
  8. ↑ 8.0 8.1 Terry CE and Pellens M (1928). "II: Development of the problem". The Opium Problem. New York: Bureau of Social Hygiene. p. 54. Retrieved 2010-09-18. 
  9. ↑ Sonnedecker G (1962). "Emergence of the Concept of Opiate Addiction". Journal mondial de Pharmacie. 3: 275–290. ISSN 0021-8405. 
  10. ↑ 10.0 10.1 10.2 Anslinger HJ and Tompkins WF (1953). "The pattern of man's use of narcotic drugs". The Traffic in Narcotics. New York: Funk and Wagnalls. p. 1. ISBN 0-405-13567-X. Retrieved 2010-09-18. 
  11. ↑ Thompson RC (1924). The Assyrian herbal: a monograph on the Assyrian vegetable drugs. London: Luzac and Company. pp. 46, 251, 261 and 269. Retrieved 2010-09-18. Thompson reinforces his view with the following quotation from a cuneiform tablet: "Early in the morning old women, boys and girls collect the juice, scraping it off the notches (of the poppy-capsule) with a small iron blade, and place it within a clay receptacle." 
  12. ↑ 12.0 12.1 Ludwig Christian Stern (1889). Ebers G, ed. Papyrus Ebers (in German). 2 (1 ed.). Leipzig: Bei S. Hirzel. OCLC 14785083. Retrieved 09-18-2010.  Check date values in: |access-date= (help)
  13. ↑ Pahor, AL (1992). "Ear, nose and throat in ancient Egypt: Part I". Journal of Laryngology & Otology. 106 (8): 677–87. doi:10.1017/S0022215100120560. PMID 1402355. Retrieved 2010-09-16. 
  14. ↑ Sullivan R (1996). "The identity and work of the ancient Egyptian surgeon" (PDF). J R Soc Med. 89 (8): 467–73. PMC 1295891 Freely accessible. PMID 8795503. Retrieved 2010-09-16. 
  15. ↑ Ebbell B (1937). The Papyrus Ebers: The greatest Egyptian medical document. Copenhagen: Levin & Munksgaard. Retrieved 2010-09-18. 
  16. ↑ Bisset NG, Bruhn JG, Curto S, Halmsted B, Nymen U, Zink MH (1994). "Was opium known in 18th Dynasty ancient Egypt? An examination of materials from the tomb of the chief royal architect Kha". J Ethnopharmacol. 41 (1-2): 99–114. doi:10.1016/0378-8741(94)90064-7. PMID 8170167. 
  17. ↑ Kritikos PG and Papadaki SP (1967). "The history of the poppy and of opium and their expansion in antiquity in the eastern Mediterranean area". Bulletin on Narcotics. 19 (3): 17–38. ISSN 0007-523X. Retrieved 2010-09-18. 
  18. ↑ Sushruta (1907). "Introduction". In Kaviraj Kunja Lal Bhishagratna. [[Sushruta Samhita]], Volume1: Sutrasthanam. Calcutta: Kaviraj Kunja Lal Bhishagratna. pp. iv. Retrieved 2010-09-13.  URL–wikilink conflict (help)
  19. ↑ Dwarakanath, S. C. (1965)Bull. Narc. 17(1), 15-19.
  20. ↑ Fort, J. (1965) Bull. Narc. 17 (3), 1-11.
  21. ↑ 21.0 21.1 21.2 Gordon BL (1949). Medicine throughout Antiquity (1 ed.). Philadelphia: F.A. Davis Company. pp. 358, 379, 385, 387. OCLC 1574261. Retrieved 2010-09-14. Pien Chiao (ca. 300 BC) used general anesthesia for surgical procedures. It is recorded that he gave two men, named "Lu" and "Chao", a toxic drink which rendered them unconscious for three days, during which time he performed a gastrotomy upon them 
  22. ↑ Giles L (transl.) (1912). Taoist teachings from the book of Lieh-Tzŭ, translated from the Chinese, with introduction and notes, by Lionel Giles (Wisdom of the East series). London: John Murray. Retrieved 2010-09-14. 
  23. ↑ Salguero CP (2009). "The Buddhist medicine king in literary context: reconsidering an early medieval example of Indian influence on Chinese medicine and surgery" (PDF). History of Religions. 48 (3): 183–210. doi:10.1086/598230. ISSN 0018-2710. Retrieved 2010-09-14. 
  24. ↑ 24.0 24.1 24.2 24.3 24.4 Chu NS (2004). "Legendary Hwa Tuo's surgery under general anesthesia in the second century China" (PDF). Acta Neurol Taiwan (in Chinese). 13 (4): 211–6. ISSN 1028-768X. PMID 15666698. Retrieved 2010-09-18. 
  25. ↑ 25.0 25.1 Giles HA (1898). A Chinese Biographical Dictionary. London: Bernard Quaritch. pp. 323–4, 762–3. Retrieved 2010-09-14. If a disease seemed beyond the reach of needles and cautery, he operated, giving his patients a dose of hashish which rendered them unconscious. 
  26. ↑ 26.0 26.1 Giles L (transl.) (1948). Cranmer-Byng JL, ed. A Gallery of Chinese immortals: selected biographies, translated from Chinese sources by Lionel Giles (Wisdom of the East series) (1 ed.). London: John Murray. Retrieved 2010-09-14. The well-attested fact that Hua T'o made use of an anaesthetic for surgical operations over 1,600 years before Sir James Simpson certainly places him to our eyes on a pinnacle of fame.... 
  27. ↑ 27.0 27.1 Chen J (2008). "A Brief Biography of Hua Tuo". Acupuncture Today. 9 (8). ISSN 1526-7784. Retrieved 2010-09-18. 
  28. ↑ Wang Z; Ping C (1999). "Well-known medical scientists: Hua Tuo". In Ping C. History and Development of Traditional Chinese Medicine. 1. Beijing: Science Press. pp. 88–93. ISBN 7-03-006567-0/R Check |isbn= value: invalid character (help). Retrieved 2010-09-13. 
  29. ↑ Fu LK (2002). "Hua Tuo, the Chinese god of surgery". J Med Biogr. 10 (3): 160–6. PMID 12114950. Retrieved 2010-09-13. 
  30. ↑ Veith I (transl.) (1972). Huang Ti Nei Ching Su Wen: The Yellow Emperor's Classic of Internal Medicine. Berkeley, Los Angeles: University of California Press. p. 265. ISBN 0-520-02158-4 http://books.google.com/?id=LYWy-AZ0Ul0C&pg=PA262&lpg=PA262&dq=0-520-02158-4&q=0-520-02158-4 |url= missing title (help). Retrieved 2010-09-13. 
  31. ↑ 31.0 31.1 Ch'en S (2000). "The Biography of Hua-t'o from the History of the Three Kingdoms". In Mair VH. The shorter Columbia anthology of traditional Chinese literature. Part III: Prose. New York: Columbia University Press. pp. 441–9. ISBN 0231119984. Retrieved 2010-09-13. 
  32. ↑ Lu GD; Needham J (2002). "Acupuncture and major surgery". Celestial lancets: a history and rationale of acupuncture and moxa. London: RoutledgeCurzon. pp. 218–30. ISBN 0-7007-1458-8. Retrieved 2010-09-13. 
  33. ↑ Wai FK (2004). "On Hua Tuo's Position in the History of Chinese Medicine". The American Journal of Chinese Medicine. 32 (2): 313–20. doi:10.1142/S0192415X04001965. PMID 15315268. Retrieved 2010-09-13. 
  34. ↑ Carroll E. "Coca: the plant and its use" (PDF). Retrieved 2010-09-18. 
  35. ↑ Peterson RC (1977). "NIDA research monograph #13: Cocaine 1977, Chapter I" (PDF). Retrieved 2010-09-16. 
  36. ↑ Rivera MA, Aufderheide AC, Cartmell LW, Torres CM, Langsjoen O., "Antiquity of coca-leaf chewing in the south central Andes: a 3,000 year archaeological record of coca-leaf chewing from northern Chile," J. Psychoactive Drugs. 2005 Dec;37(4):455-8.
  37. ↑ Skinner, P (2008). "Unani-tibbi". In Laurie J. Fundukian. The Gale Encyclopedia of Alternative Medicine (3rd ed.). Farmington Hills, Michigan: Gale Cengage. ISBN 978-1-4144-4872-5. http://findarticles.com/p/articles/mi_g2603/is_0007/ai_2603000716/. Retrieved 2010-09-13. 
  38. ↑ Ajram K (1992). Miracle of Islamic Science (1 ed.). Vernon Hills, IL: Knowledge House Publishers. pp. Appendix B. ISBN 9780911119435. Retrieved 2010-09-18. 
  39. ↑ Hunke S (1960). Allahs Sonne über dem Abendland: unser arabisches Erbe (in German) (2 ed.). Stuttgart: Deutsche Verlags-Anstalt. pp. 279–80. ISBN 9783596235438. Retrieved 2010-09-13. The science of medicine has gained a great and extremely important discovery and that is the use of general anaesthetics for surgical operations, and how unique, efficient, and merciful for those who tried it the Muslim anaesthetic was. It was quite different from the drinks the Indians, Romans and Greeks were forcing their patients to have for relief of pain. There had been some allegations to credit this discovery to an Italian or to an Alexandrian, but the truth is and history proves that, the art of using the anaesthetic sponge is a pure Muslim technique, which was not known before. The sponge used to be dipped and left in a mixture prepared from cannabis, opium, hyoscyamus and a plant called Zoan. 
  40. ↑ Kritikos PG and Papadaki SP (1967). Bulletin on Narcotics. 19 (4): 5–10. ISSN 0007-523X.  Missing or empty |title= (help);
  41. ↑ Gravenstein JS (1965). "Paracelsus and his contributions to anesthesia". Anesthesiology. 26 (6): 805–11. PMID 5320896. Retrieved 2010-09-20. 
  42. ↑ Priestley J (1775). Experiments and Observations on Different Kinds of Air. 1 (2 ed.). London: J. Johnson. pp. 108–29, 203–29. Retrieved 2010-09-13. 
  43. ↑ Levere, TH (1977). "Dr. Thomas Beddoes and the establishment of his Pneumatic Institution: a tale of three presidents". Notes and Records of the Royal Society of London. 32 (1): 41–9. doi:10.1098/rsnr.1977.0005. PMID 11615622. Retrieved 2010-09-13. 
  44. ↑ Sneader W (2005). "Chapter 8: Systematic medicine". Drug discovery: a history. Chichester, England: John Wiley and Sons. pp. 78–9. ISBN 9780471899808. Retrieved 2010-09-13. 
  45. ↑ Davy H (1800). Researches, chemical and philosophical–chiefly concerning nitrous oxide or dephlogisticated nitrous air, and its respiration. Bristol: Biggs and Cottle. Retrieved 2010-09-18. 
  46. ↑ 46.0 46.1 46.2 Izuo M (2004). "Medical history: Seishū Hanaoka and his success in breast cancer surgery under general anesthesia two hundred years ago". Breast Cancer. 11 (4): 319–24. doi:10.1007/BF02968037. PMID 15604985. Retrieved 2010-09-13. 
  47. ↑ Ogata T (1973). "Seishu Hanaoka and his anaesthesiology and surgery". Anaesthesia. 28 (6): 645–52. doi:10.1111/j.1365-2044.1973.tb00549.x. PMID 4586362. Retrieved 2010-09-13. 
  48. ↑ 48.0 48.1 Hyodo M (1992). "Doctor S. Hanaoka, the world's-first success in providing general anesthesia". In Hyodo M, Oyama T and Swerdlow M. The Pain Clinic IV: proceedings of the fourth international symposium. Utrecht, Netherlands: VSP. pp. 3–12. ISBN 9067641472. Retrieved 2010-09-13. 
  49. ↑ 49.0 49.1 van D. JH (2010). "Chosen-asagao and the recipe for Hanaoka's anesthetic 'tsusensan'". Brighton, UK: BLTC Research. Retrieved 2010-09-13.  External link in |publisher= (help)
  50. ↑ Matsuki A (1999). "A bibliographical study on Shutei Nakagawa's "Mayaku-ko" (a collection of anesthetics and analgesics)--a comparism of four manuscripts". Nihon Ishigaku Zasshi (Journal of the Japanese Society for Medical History) (in Japanese). 45 (4): 585–99. ISSN 0549-3323. PMID 11624281. Retrieved 2010-09-13. 
  51. ↑ Perrin, N (1979). Giving up the gun: Japan's reversion to the sword, 1543-1879. Boston: David R. Godine. p. 86. ISBN 0879237732. Retrieved 2010-09-13. 
  52. ↑ 52.0 52.1 Matsuki A (2000). "New studies on the history of anesthesiology--a new study on Seishū Hanaoka's "Nyugan Ckiken Roku" (a surgical experience with breast cancer)". Masui: the Japanese Journal of Anesthesiology. 49 (9): 1038–43. ISSN 0021-4892. PMID 11025965. Retrieved 2010-09-13. 
  53. ↑ Tominaga T (1994). "Presidential address: Newly established Japanese breast cancer society and the future". Breast Cancer. 1 (2): 69–78. doi:10.1007/BF02967035. PMID 11091513. Retrieved 2010-09-13. 
  54. ↑ Matsuki A (2002). "A Study on Seishu Hanaoka's Nyugan Seimei Roku (Scroll of Diseases): A Name List of Breast Cancer Patients". Nihon Ishigaku Zasshi (Journal of the Japanese Society for Medical History) (in Japanese). 48 (1): 53–65. ISSN 0549-3323. PMID 12152628. Retrieved 2010-09-13. 
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  62. ↑ Stone RF (1898). Stone RF, ed. Biography of Eminent American Physicians and Surgeons (2 ed.). Indianapolis: CE Hollenbeck. p. 89. Retrieved 2010-09-13. 
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  64. ↑ Wells, H (1847). A History of the Discovery of the Application of Nitrous Oxide Gas, Ether, and Other Vapors to Surgical Operations. Hartford: J. Gaylord Wells. Retrieved 2010-09-13. 
  65. ↑ 65.0 65.1 Morton, WTG (1847). Remarks on the Proper Mode of Administering Sulphuric Ether by Inhalation (PDF). Boston: Button and Wentworth. OCLC 14825070. Retrieved 2010-09-13. 
  66. ↑ 66.0 66.1 Fenster, JM (2001). Ether Day: The Strange Tale of America's Greatest Medical Discovery and the Haunted Men Who Made It. New York, NY: HarperCollins. ISBN 978-0060195236accessdate=09-13-2010 Check |isbn= value: invalid character (help). 
  67. ↑ Jackson CT (1861). A Manual of Etherization: Containing Directions for the Employment of Ether. Boston: J.B. Mansfield. Retrieved 2010-09-13. 
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  71. ↑ Wawersik, J (1991). "History of anesthesia in Germany". Journal of Clinical Anesthesia. 3 (3): 235–244. doi:10.1016/0952-8180(91)90167-L. PMID 1878238. Retrieved 2010-09-13. 
  72. ↑ Bain, JA; Spoerel, WE (1964). "Observation on the use of cuffed tracheostomy tubes (with particular reference to the James tube)". Canadian Journal of Anesthesia. 11 (6): 598–608. doi:10.1007/BF03004104. PMID 14232175. 
  73. ↑ Macewen, W (1880). "General observations on the introduction of tracheal tubes by the mouth instead of performing tracheotomy or laryngotomy". British Medical Journal. 2 (1021): 122–4. doi:10.1136/bmj.2.1021.122. PMC 2241109 Freely accessible. PMID 20749630. 
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  75. ↑ Macmillan, M (2010). "William Macewen [1848–1924]". Journal of Neurology. 257 (5): 858–9. doi:10.1007/s00415-010-5524-5. PMID 20306068. 
  76. ↑ García, M (1855). "Observations on the Human Voice". Proceedings of the Royal Society of London. 7: 399–410. doi:10.1098/rspl.1854.0094. Retrieved 2010-09-13. 
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  79. ↑ Hirsch, NP; Smith, GB; Hirsch, PO (1986). "Alfred Kirstein. Pioneer of direct laryngoscopy". Anaesthesia. 41 (1): 42–5. doi:10.1111/j.1365-2044.1986.tb12702.x. PMID 3511764. 
  80. ↑ Mackenzie, M (1888). The case of Emperor Frederick III.: full official reports by the German physicians and by Sir Morell Mackenzie. New York: Edgar S. Werner. p. 276. Retrieved 2010-09-13. 
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  82. ↑ Fischer EH; Mering J (1903). "Ueber eine neue Classe von Schlafmitteln". Therapie der Gegenwart (in German). 5: 97–101. Retrieved 2010-09-13. 
  83. ↑ Jackson, C (1913). "The technique of insertion of intratracheal insufflation tubes". Surgery, gynecology & obstetrics. 17: 507–9.  Abstract reprinted in Pediatric Anesthesia 6(3):230
  84. ↑ Zeitels, SM (1998). "Chevalier Jackson's contributions to direct laryngoscopy". Journal of Voice. 12 (1): 1–6. doi:10.1016/S0892-1997(98)80069-6. PMID 9619973. 
  85. ↑ Jackson, C (1922). "I: Instrumentarium". A manual of peroral endoscopy and laryngeal surgery (PDF). Philadelphia: W.B. Saunders. pp. 17–52. ISBN 978-1-4326-6305-6. Retrieved 2010-09-13. 
  86. ↑ Janeway, HH (1913). "Intra-tracheal anesthesia from the standpoint of the nose, throat and oral surgeon with a description of a new instrument for catheterizing the trachea". The Laryngoscope. 23 (11): 1082–90. doi:10.1288/00005537-191311000-00009. 
  87. ↑ Tabern DL; Volwiler EH (1935). "Sulfur-containing barbiturate hypnotics". J Am Chem Soc. 57 (10): 1961–3. doi:10.1021/ja01313a062. Retrieved 2010-09-13. 
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  90. ↑ Rowbotham, ES; Magill, I (1921). "Anaesthetics in the Plastic Surgery of the Face and Jaws". Proceedings of the Royal Society of Medicine. 14 (Sect Anaesth): 17–27. PMC 2152821 Freely accessible. PMID 19981941. 
  91. ↑ Magill, I (1923). "The provision for expiration in endotracheal insufflations anaesthesia". The Lancet. 202 (5211): 68–9. doi:10.1016/S0140-6736(01)37756-5. 
  92. ↑ Magill, I (1928). "Endotracheal anaesthesia". Proceedings of the Royal Society of Medicine. 22 (2): 85–8. PMC 2101959 Freely accessible. 
  93. ↑ Magill, I (1930). "Technique in endotracheal anaesthesia". British Medical Journal. 2: 817–9. doi:10.1136/bmj.2.1243.817-a. PMC 2451624 Freely accessible. 
  94. ↑ Thomas, KB (1978). "Sir Ivan Whiteside Magill, KCVO, DSc, MB, BCh, BAO, FRCS, FFARCS (Hon), FFARCSI (Hon), DA. A review of his publications and other references to his life and work". Anaesthesia. 33 (7): 628–34. doi:10.1111/j.1365-2044.1978.tb08426.x. PMID 356665. 
  95. ↑ McLachlan, G (2008). "Sir Ivan Magill KCVO, DSc, MB, BCh, BAO, FRCS, FFARCS (Hon), FFARCSI (Hon), DA, (1888–1986)". The Ulster Medical Journal. 77 (3): 146–52. PMC 2604469 Freely accessible. PMID 18956794. 
  96. ↑ Magill, I (1920). "Forceps for intratracheal anaesthesia". British Medical Journal. 2: 670. doi:10.1136/bmj.2.571.670. PMC 2338485 Freely accessible. 
  97. ↑ Magill, I (1926). "An improved laryngoscope for anaesthetists". The Lancet. 207 (5349): 500. doi:10.1016/S0140-6736(01)17109-6. 
  98. ↑ Magill, I (1921). "A Portable Apparatus for Tracheal Insufflation Anaesthesia". The Lancet. 197 (5096): 918. doi:10.1016/S0140-6736(00)55592-5. 
  99. ↑ Magill, I (1921). "Warming Ether Vapour for Inhalation". The Lancet. 197 (5102): 1270. doi:10.1016/S0140-6736(01)24908-3. 
  100. ↑ Magill, I (1923). "An apparatus for the administration of nitrous oxide, oxygen, and ether". The Lancet. 202 (5214): 228. doi:10.1016/S0140-6736(01)22460-X. 
  101. ↑ Macintosh, RR (1943). "A new laryngoscope". The Lancet. 241 (6233): 205. doi:10.1016/S0140-6736(00)89390-3. 
  102. ↑ Scott, J; Baker, PA (2009). "How did the Macintosh laryngoscope become so popular?". Paediatric Anaesthesia. 19 (Suppl 1): 24–9. doi:10.1111/j.1460-9592.2009.03026.x. PMID 19572841. 
  103. ↑ Macintosh, RR (1949). "An aid to oral intubation". British Medical Journal. 1 (4591): 28. doi:10.1136/bmj.1.4591.26-b. PMC 2049235 Freely accessible. 
  104. ↑ Venn, PH (1993). "The gum elastic bougie". Anaesthesia. 48: 274–5. doi:10.1111/j.1365-2044.1993.tb06936.X. 
  105. ↑ Viswanathan, S; Campbell, C; Wood, DG; Riopelle, JM; Naraghi, M (1992). "The Eschmann Tracheal Tube Introducer. (Gum elastic bougie)". Anesthesiology Review. 19 (6): 29–34. PMID 10148170. 
  106. ↑ Henderson, JJ (2003). "Development of the 'gum-elastic bougie'". Anaesthesia. 58 (1): 103–4. doi:10.1046/j.1365-2044.2003.296828.x. PMID 12492697. 
  107. ↑ Murphy, P (1967). "A fibre-optic endoscope used for nasal intubation". Anaesthesia. 22 (3): 489–91. doi:10.1111/j.1365-2044.1967.tb02771.x. PMID 4951601. Retrieved 2010-09-13. 
  108. ↑ Wheeler M and Ovassapian A (2007). "Chapter 18: Fiberoptic endoscopy-aided technique". In Benumof, JL. Benumof's Airway Management: Principles and Practice (2nd ed.). Philadelphia: Mosby-Elsevier. p. 423. ISBN 978-0-323-02233-0. Retrieved 2010-09-13. 
  109. ↑ Agrò, F; Barzoi, G; Montecchia, F (2003). "Tracheal intubation using a Macintosh laryngoscope or a GlideScope in 15 patients with cervical spine immobilization". British Journal of Anaesthesia. 90 (5): 705–6. doi:10.1093/bja/aeg560. PMID 12697606. 
  110. ↑ Cooper, RM; Pacey, JA; Bishop, MJ; McCluskey, SA (2005). "Early clinical experience with a new videolaryngoscope (GlideScope) in 728 patients" (PDF). Canadian Journal of Anesthesia. 52 (2): 191–8. doi:10.1007/BF03027728. PMID 15684262. Retrieved 2010-09-18. 
  111. ↑ Tonner, PH (2006). "Xenon: one small step for anaesthesia…? (editorial review)". Current Opinion in Anaesthesiology. 19 (4): 382–384. doi:10.1097/01.aco.0000236136.85356.13. PMID 16829718. Retrieved 2010-09-15. 
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