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Higgs A, McGrath BA, Goddard C, Rangasami J, Suntharalingam G, Gale R, Cook TM. Guidelines for the management of tracheal intubation in critically ill adults. Br J Anaesth 2017; 120:323-352. [PMID: 29406182 DOI: 10.1016/j.bja.2017.10.021] [Citation(s) in RCA: 447] [Impact Index Per Article: 63.9] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/31/2017] [Revised: 10/23/2017] [Accepted: 10/25/2017] [Indexed: 12/17/2022] Open
Abstract
These guidelines describe a comprehensive strategy to optimize oxygenation, airway management, and tracheal intubation in critically ill patients, in all hospital locations. They are a direct response to the 4th National Audit Project of the Royal College of Anaesthetists and Difficult Airway Society, which highlighted deficient management of these extremely vulnerable patients leading to major complications and avoidable deaths. They are founded on robust evidence where available, supplemented by expert consensus opinion where it is not. These guidelines recognize that improved outcomes of emergency airway management require closer attention to human factors, rather than simply introduction of new devices or improved technical proficiency. They stress the role of the airway team, a shared mental model, planning, and communication throughout airway management. The primacy of oxygenation including pre- and peroxygenation is emphasized. A modified rapid sequence approach is recommended. Optimal management is presented in an algorithm that combines Plans B and C, incorporating elements of the Vortex approach. To avoid delays and task fixation, the importance of limiting procedural attempts, promptly recognizing failure, and transitioning to the next algorithm step are emphasized. The guidelines recommend early use of a videolaryngoscope, with a screen visible to all, and second generation supraglottic airways for airway rescue. Recommendations for emergency front of neck airway are for a scalpel-bougie-tube technique while acknowledging the value of other techniques performed by trained experts. As most critical care airway catastrophes occur after intubation, from dislodged or blocked tubes, essential methods to avoid these complications are also emphasized.
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Affiliation(s)
- A Higgs
- Anaesthesia and Intensive Care Medicine, Warrington and Halton Hospitals NHS Foundation Trust, Cheshire, UK(8).
| | - B A McGrath
- Anaesthesia and Intensive Care Medicine, University Hospital South Manchester, Manchester, UK(9)
| | - C Goddard
- Anaesthesia & Intensive Care Medicine, Southport and Ormskirk Hospitals NHS Trust, Southport, UK(8)
| | - J Rangasami
- Anaesthesia & Intensive Care Medicine, Wexham Park Hospital, Frimley Health NHS Foundation Trust, Slough, UK(8)
| | - G Suntharalingam
- Intensive Care Medicine and Anaesthesia, London North West Healthcare NHS Trust, London, UK(10)
| | - R Gale
- Anaesthesia & Intensive Care Medicine, Countess of Chester Hospital NHS Foundation Trust, Chester, UK(11)
| | - T M Cook
- Anaesthesia and Intensive Care Medicine, Royal United Hospitals Bath NHS Foundation Trust, Bath, UK(12)
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Sakles JC. Maintenance of Oxygenation During Rapid Sequence Intubation in the Emergency Department. Acad Emerg Med 2017; 24:1395-1404. [PMID: 28791775 DOI: 10.1111/acem.13271] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- John C. Sakles
- Department of Emergency Medicine; University of Arizona College of Medicine; Tucson AZ
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Ghebremichael S, Gumbert SD, Vanga N, Mancillas OL, Burnett T, Cai C, Hagberg CA. Evaluation of SuperNO 2 VA™ mask technology in a clinical setting: A pilot study. TRENDS IN ANAESTHESIA AND CRITICAL CARE 2017. [DOI: 10.1016/j.tacc.2017.09.054] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
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Is preoxygenation still important? New concepts. TRENDS IN ANAESTHESIA AND CRITICAL CARE 2017. [DOI: 10.1016/j.tacc.2017.09.003] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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Kriege M, Alflen C, Tzanova I, Schmidtmann I, Piepho T, Noppens RR. Evaluation of the McGrath MAC and Macintosh laryngoscope for tracheal intubation in 2000 patients undergoing general anaesthesia: the randomised multicentre EMMA trial study protocol. BMJ Open 2017; 7:e016907. [PMID: 28827261 PMCID: PMC5724220 DOI: 10.1136/bmjopen-2017-016907] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/04/2022] Open
Abstract
INTRODUCTION The direct laryngoscopy technique using a Macintosh blade is the first choice globally for most anaesthetists. In case of an unanticipated difficult airway, the complication rate increases with the number of intubation attempts. Recently, McGrath MAC (McGrath) video laryngoscopy has become a widely accepted method for securing an airway by tracheal intubation because it allows the visualisation of the glottis without a direct line of sight. Several studies and case reports have highlighted the benefit of the video laryngoscope in the visualisation of the glottis and found it to be superior in difficult intubation situations. The aim of this study was to compare the first-pass intubation success rate using the (McGrath) video laryngoscope compared with conventional direct laryngoscopy in surgical patients. METHODS AND ANALYSIS The EMMA trial is a multicentre, open-label, patient-blinded, randomised controlled trial. Consecutive patients requiring tracheal intubation are randomly allocated to either the McGrath video laryngoscope or direct laryngoscopy using the Macintosh laryngoscope. The expected rate of successful first-pass intubation is 95% in the McGrath group and 90% in the Macintosh group. Each group must include a total of 1000 patients to achieve 96% power for detecting a difference at the 5% significance level. Successful intubation with the first attempt is the primary endpoint. The secondary endpoints are the time to intubation, attempts for successful intubation, the necessity of alternatives, visualisation of the glottis using the Cormack & Lehane score and percentage of glottic opening score and definite complications. ETHICS AND DISSEMINATION The project was approved by the local ethics committee of the Medical Association of the Rhineland Palatine state and Westphalia-Lippe. The results of this study will be made available in the form of manuscripts for publication and presentations at national and international meetings. TRIAL REGISTRATION NUMBER ClinicalTrials.gov NCT 02611986; pre-results.
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Affiliation(s)
- Marc Kriege
- Department of Anaesthesiology, University Medical Centre of the Johannes, Gutenberg University, Mainz, Germany
| | - Christian Alflen
- Department of Anaesthesiology, University Medical Centre of the Johannes, Gutenberg University, Mainz, Germany
| | - Irene Tzanova
- Department of Anaesthesiology, Christophorus Hospital, Coesfeld, Germany
| | - Irene Schmidtmann
- Institute of Medical Biostatistics, Epidemiology and Informatics, University Medical Centre of the Johannes Gutenberg University, Mainz, Germany
| | - Tim Piepho
- Department of Anaesthesiology, University Medical Centre of the Johannes, Gutenberg University, Mainz, Germany
| | - Ruediger R Noppens
- Department of Anaesthesiology, University Medical Centre of the Johannes, Gutenberg University, Mainz, Germany
- Department of Anesthesia and Perioperative Medicine, Western University, London, Ontario, Canada
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Zou XF, Gu JH, Cui ZL, Lu YW, Gu C. CXC Chemokine Receptor Type 4 Antagonism Ameliorated Allograft Fibrosis in Rat Kidney Transplant Model. EXP CLIN TRANSPLANT 2017; 15:448-452. [PMID: 28585910 DOI: 10.6002/ect.2016.0071] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
OBJECTIVES In this study, we evaluated the effects of CXC chemokine receptor type 4 and stromal cell-derived factor 1 signaling in the progression of chronic allograft nephropathy in a rat model. MATERIALS AND METHODS Experimental rats were divided into 3 groups: Lewis-to-Lewis isograft transplant (group A), Fisher 344 rat-to-Lewis allograft transplant with immunosuppressant cyclosporine (group B), and Fisher 344 rat-to-Lewis allograft transplant treated with cyclosporine and the CXC chemokine receptor type 4 antagonist AMD3100 (1 mg/kg/d) (group C). On day 90 after the operation, renal graft function, proteinuria, and histologic Banff score were measured. The expression levels of transforming growth factor β1 and collagen IV were determined by quantitative real-time polymerase chain reaction. RESULTS Renal function and urinary protein were increased in allografts of groups B and C compared with isografts of group A. The Banff score was significantly decreased in the AMD3100-treated animals (group C), with renal fibrosis being reduced. In addition, overexpressed levels of transforming growth factor β1 and collagen IV in group B allografts were significantly reduced versus that shown with treatment with the CXC chemokine receptor type 4 antagonist in group C. CONCLUSIONS Together, these data strongly implicate that CXC chemokine receptor type 4 antagonism alleviated renal interstitial fibrosis in long-term surviving allografts by down-regulating expression of transforming growth factor β1.
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Affiliation(s)
- Xun-Feng Zou
- From the Department of General Surgery, Tianjin First Central Hospital, Tianjin 300192, China
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Groombridge CJ, Ley E, Miller M, Konig T. A prospective, randomised trial of pre-oxygenation strategies available in the pre-hospital environment. Anaesthesia 2017; 72:580-584. [DOI: 10.1111/anae.13852] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 01/30/2017] [Indexed: 11/27/2022]
Affiliation(s)
- C. J. Groombridge
- London's Air Ambulance; Bart's Health NHS Trust; London UK
- Essex and Herts Air Ambulance Trust; UK
| | - E. Ley
- Essex and Herts Air Ambulance Trust; UK
| | - M. Miller
- Kent Surrey and Sussex Air Ambulance Trust; Marden UK
| | - T. Konig
- London's Air Ambulance; Bart's Health NHS Trust; London UK
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Sakles JC. Improving the Safety of Rapid Sequence Intubation in the Emergency Department. Ann Emerg Med 2017; 69:7-9. [DOI: 10.1016/j.annemergmed.2016.11.034] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/25/2016] [Indexed: 11/16/2022]
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Driver BE, Prekker ME, Kornas RL, Cales EK, Reardon RF. Flush Rate Oxygen for Emergency Airway Preoxygenation. Ann Emerg Med 2017; 69:1-6. [DOI: 10.1016/j.annemergmed.2016.06.018] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/01/2016] [Revised: 06/03/2016] [Accepted: 06/13/2016] [Indexed: 10/21/2022]
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Myatra SN, Shah A, Kundra P, Patwa A, Ramkumar V, Divatia JV, Raveendra US, Shetty SR, Ahmed SM, Doctor JR, Pawar DK, Ramesh S, Das S, Garg R. All India Difficult Airway Association 2016 guidelines for the management of unanticipated difficult tracheal intubation in adults. Indian J Anaesth 2016; 60:885-898. [PMID: 28003690 PMCID: PMC5168891 DOI: 10.4103/0019-5049.195481] [Citation(s) in RCA: 124] [Impact Index Per Article: 15.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023] Open
Abstract
The All India Difficult Airway Association (AIDAA) guidelines for management of the unanticipated difficult airway in adults provide a structured, stepwise approach to manage unanticipated difficulty during tracheal intubation in adults. They have been developed based on the available evidence; wherever robust evidence was lacking, or to suit the needs and situation in India, recommendations were arrived at by consensus opinion of airway experts, incorporating the responses to a questionnaire sent to members of the AIDAA and the Indian Society of Anaesthesiologists. We recommend optimum pre-oxygenation and nasal insufflation of 15 L/min oxygen during apnoea in all patients, and calling for help if the initial attempt at intubation is unsuccessful. Transnasal humidified rapid insufflations of oxygen at 70 L/min (transnasal humidified rapid insufflation ventilatory exchange) should be used when available. We recommend no more than three attempts at tracheal intubation and two attempts at supraglottic airway device (SAD) insertion if intubation fails, provided oxygen saturation remains ≥ 95%. Intubation should be confirmed by capnography. Blind tracheal intubation through the SAD is not recommended. If SAD insertion fails, one final attempt at mask ventilation should be tried after ensuring neuromuscular blockade using the optimal technique for mask ventilation. Failure to intubate the trachea as well as an inability to ventilate the lungs by face mask and SAD constitutes 'complete ventilation failure', and emergency cricothyroidotomy should be performed. Patient counselling, documentation and standard reporting of the airway difficulty using a 'difficult airway alert form' must be done. In addition, the AIDAA provides suggestions for the contents of a difficult airway cart.
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Affiliation(s)
- Sheila Nainan Myatra
- Department of Anaesthesiology, Critical Care and Pain, Tata Memorial Hospital, Mumbai, Maharashtra, India
- Address for correspondence: Prof. Sheila Nainan Myatra, Department of Anaesthesiology, Critical Care and Pain, Tata Memorial Hospital, Dr. Ernest Borges Road, Mumbai - 400 012, Maharashtra, India. E-mail:
| | - Amit Shah
- Kailash Cancer Hospital and Research Centre, Vadodara Institute of Neurological Sciences, Vadodara, Gujarat, India
| | - Pankaj Kundra
- Department of Anaesthesiology and Critical Care, JIPMER, Puducherry, India
| | - Apeksh Patwa
- Kailash Cancer Hospital and Research Centre, Vadodara Institute of Neurological Sciences, Vadodara, Gujarat, India
| | | | - Jigeeshu Vasishtha Divatia
- Department of Anaesthesiology, Critical Care and Pain, Tata Memorial Hospital, Mumbai, Maharashtra, India
| | - Ubaradka S Raveendra
- Department of Anaesthesiology and Critical Care, K S Hegde Medical Academy, Nitte University, Mangalore, Karnataka, India
| | - Sumalatha Radhakrishna Shetty
- Department of Anaesthesiology and Critical Care, K S Hegde Medical Academy, Nitte University, Mangalore, Karnataka, India
| | - Syed Moied Ahmed
- Department of Anaesthesiology and Critical Care, J N Medical College and Hospital, AMU, Aligarh, Uttar Pradesh, India
| | - Jeson Rajan Doctor
- Department of Anaesthesiology, Critical Care and Pain, Tata Memorial Hospital, Mumbai, Maharashtra, India
| | - Dilip K Pawar
- Department of Anaesthesiology, All India Institute of Medical Sciences, New Delhi, India
| | - Singaravelu Ramesh
- Department of Anaesthesiology, Kanchi Kamakoti Childs Trust Hospital, Chennai, Tamil Nadu, India
| | - Sabyasachi Das
- Department of Anaesthesiology, North Bengal Medical College, Darjeeling, West Bengal, India
| | - Rakesh Garg
- Department of Onco-Anaesthesiology and Palliative Medicine, Dr BRAIRCH, All India Institute of Medical Sciences, New Delhi, India
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Sakles JC, Mosier JM, Patanwala AE, Dicken JM. Apneic oxygenation is associated with a reduction in the incidence of hypoxemia during the RSI of patients with intracranial hemorrhage in the emergency department. Intern Emerg Med 2016; 11:983-92. [PMID: 26846234 DOI: 10.1007/s11739-016-1396-8] [Citation(s) in RCA: 46] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/15/2015] [Accepted: 01/13/2016] [Indexed: 11/26/2022]
Abstract
Critically ill patients undergoing emergent intubation are at risk of oxygen desaturation during the management of their airway. Patients with intracranial hemorrhage (ICH) are particularly susceptible to the detrimental effects of hypoxemia. Apneic oxygenation (AP OX) may be able to reduce the occurrence of oxygen desaturation during the emergent intubation of these patients. We sought to assess the effect AP OX on oxygen desaturation during the rapid sequence intubation (RSI) of patients with ICH in the emergency department (ED). We prospectively collected data on all patients intubated in an urban academic ED over the 2-year period from July 1, 2013 to June 30, 2015. Following each intubation, the operator completed a standardized continuous quality improvement (CQI) data form, which included information on patient, operator and intubation characteristics. Operators recorded data on the use of AP OX, the oxygen flow rate used for AP OX, and the starting and lowest saturations during intubation. Adult patients with ICH who underwent RSI by emergency medicine (EM) residents were included in the analyses. The primary outcome variable was any oxygen saturation <90 % during the intubation. We performed a backward stepwise multivariate logistic regression analysis to identify variables associated with oxygen desaturation. The primary independent variable of interest was the use of AP OX during the intubation. Inclusion criteria for the study was met by 127 patients. AP OX was used in 72 patients (AP OX group) and was not used in 55 patients (NO AP OX group). The incidence of desaturation was 5/72 (7 %) in the AP OX group and was 16/55 (29 %) in the NO AP OX group. In the multivariate logistic regression analysis the use of AP OX was associated with a reduced odds of desaturation (aOR 0.13; 95 % CI 0.03-0.53). Patients with ICH who received AP OX during RSI in the ED were seven times less likely to have an oxygen saturation of <90 % during the intubation compared to patients who did not receive AP OX. AP OX is a simple intervention that may minimize the risk of oxygen desaturation during the RSI of patients with ICH.
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Affiliation(s)
- John C Sakles
- Department of Emergency Medicine, University of Arizona College of Medicine, Tucson, AZ, USA.
| | - Jarrod M Mosier
- Department of Emergency Medicine, University of Arizona College of Medicine, Tucson, AZ, USA
| | - Asad E Patanwala
- Department of Pharmacy Practice and Science, University of Arizona College of Pharmacy, Tucson, AZ, USA
| | - John M Dicken
- University of Arizona College of Medicine, Tucson, AZ, USA
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Hayes-Bradley C, Lewis A, Burns B, Miller M. Efficacy of Nasal Cannula Oxygen as a Preoxygenation Adjunct in Emergency Airway Management. Ann Emerg Med 2016; 68:174-80. [DOI: 10.1016/j.annemergmed.2015.11.012] [Citation(s) in RCA: 35] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/05/2015] [Revised: 11/02/2015] [Accepted: 11/06/2015] [Indexed: 11/24/2022]
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Kim TH, Hwang SO, Cha YS, Kim OH, Lee KH, Kim H, Cha KC. The utility of noninvasive nasal positive pressure ventilators for optimizing oxygenation during rapid sequence intubation. Am J Emerg Med 2016; 34:1627-30. [PMID: 27339225 DOI: 10.1016/j.ajem.2016.05.074] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/04/2016] [Accepted: 05/25/2016] [Indexed: 11/30/2022] Open
Abstract
OBJECTIVES The objective of the study is to investigate the feasibility of noninvasive nasal positive pressure ventilation (NINPPV) for optimizing oxygenation during the rapid sequence intubation in critically ill patients. METHODS A prospective, observational study was performed in an emergency department. Noninvasive nasal positive pressure ventilation was applied in the preoxygenation step and maintained until successful intubation. A pulse oximetry (Spo2) was continuously monitored throughout the procedure and recorded 5 times. The degree of interfering was surveyed with 10-point Likert scale. RESULTS Thirty patients were enrolled. The most of enrolled patients were diagnosed as pneumonia, acute heart failure, and traumatic brain injury. The Spo2 was increased to 100% (98%-100%) at the time of starting endotracheal intubation with NINPPV and maintained as 97% (95%-100%) until successful intubation (P< .001). Total apnea duration was 195 seconds (190-196). The degree of interfering intubation was 1 (0-1). CONCLUSIONS Noninvasive nasal positive pressure ventilation would be useful for optimizing oxygenation during rapid sequence intubation.
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Affiliation(s)
- Tae Hoon Kim
- Department of Emergency Medicine, Busan Baik Hospital, Inje University, Republic of Korea
| | - Sung Oh Hwang
- Department of Emergency Medicine, Yonsei University Wonju College of Medicine, Republic of Korea
| | - Yong Sung Cha
- Department of Emergency Medicine, Yonsei University Wonju College of Medicine, Republic of Korea
| | - Oh Hyun Kim
- Department of Emergency Medicine, Yonsei University Wonju College of Medicine, Republic of Korea
| | - Kang Hyun Lee
- Department of Emergency Medicine, Yonsei University Wonju College of Medicine, Republic of Korea
| | - Hyun Kim
- Department of Emergency Medicine, Yonsei University Wonju College of Medicine, Republic of Korea
| | - Kyoung-Chul Cha
- Department of Emergency Medicine, Yonsei University Wonju College of Medicine, Republic of Korea.
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Liu JH, Xue FS, Liu GP, Sun C, Sheta SA. Comparing performance of stylets for orotracheal intubation by Glidescope videolaryngoscope. Saudi Med J 2016; 37:587-8. [PMID: 27146626 PMCID: PMC4880663 DOI: 10.15537/smj.2016.5.15426] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
Affiliation(s)
- Jian-Hua Liu
- Department of Anesthesiology, Plastic Surgery Hospital, Chinese Academy of Medical Sciences, and Peking Union Medical College, Beijing, People's Republic of China. E-mail.
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Windpassinger M, Plattner O, Gemeiner J, Röder G, Baumann A, Zimmerman NM, Sessler DI. Pharyngeal Oxygen Insufflation During AirTraq Laryngoscopy Slows Arterial Desaturation in Infants and Small Children. Anesth Analg 2016; 122:1153-7. [PMID: 26991620 DOI: 10.1213/ane.0000000000001189] [Citation(s) in RCA: 32] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
BACKGROUND The extent to which insufflation of oxygen into the posterior pharynx during laryngoscopy prolongs adequate saturation in infants and small children remains unknown. Therefore, we compared oxygen saturation over time in preoxygenated small children with and without posterior pharynx oxygen insufflation. METHODS After induction of anesthesia with sevoflurane and propofol, infants and small children were preoxygenated with 100% oxygen for 3 minutes. An AirTraq laryngoscope size 0 or 1 with an appropriately sized cuffed endotracheal tube positioned in the side channel was prepared. Oxygen tubing was connected to the endotracheal U-shaped tube. However, oxygen at a flow of 4 L/min was provided only to half of the randomly selected participating patients. The trachea was intubated, the tube cuff was inflated, and the laryngoscope was removed from the mouth. The oxygen tubing was disconnected from the endotracheal tube and left exposed to ambient air until oxygen saturation decreased to 95%. Thereafter, patients' lungs were manually ventilated with 100% oxygen until SpO2 returned to 100%. Subsequent anesthetic management was at the discretion of the attending anesthesiologist. RESULTS Laryngoscopy took a median of 60 (Q1-Q3, 40-90) seconds. The mean time to 95% oxygen saturation was (mean ± SD) 166 ± 47 seconds in the oxygen insufflation group and 131 ± 39 seconds in small children without insufflation. Oxygen insufflation prolonged the mean time for saturation to decrease from 100% to 95% by an estimated 35 (95% confidence interval, 10-60) seconds, P = 0.01. CONCLUSIONS Adding posterior pharyngeal oxygen insufflation to conventional preoxygenation prolonged the period of adequate oxygen saturation in infants and small children by an amount that is potentially clinically important.
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Affiliation(s)
- Marita Windpassinger
- From the Departments of *Anesthesiology and †Oral Maxillofacial Surgery, University Hospital Vienna, Vienna, Austria; and Departments of ‡Outcomes Research and §Quantitative Health Sciences, Cleveland Clinic, Cleveland, Ohio
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Groombridge C, Chin CW, Hanrahan B, Holdgate A. Assessment of Common Preoxygenation Strategies Outside of the Operating Room Environment. Acad Emerg Med 2016; 23:342-6. [PMID: 26728311 DOI: 10.1111/acem.12889] [Citation(s) in RCA: 32] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/04/2015] [Revised: 09/13/2015] [Accepted: 11/02/2015] [Indexed: 11/30/2022]
Abstract
OBJECTIVES Preoxygenation prior to intubation aims to increase the duration of safe apnea by causing denitrogenation of the functional residual capacity, replacing this volume with a reservoir of oxygen. In the operating room (OR) the criterion standard for preoxygenation is an anesthetic circuit and well-fitting face mask, which provide a high fractional inspired oxygen concentration (FiO2 ). Outside of the OR, various strategies exist to provide preoxygenation. The objective was to evaluate the effectiveness of commonly used preoxygenation strategies outside of the OR environment. METHODS This was a prospective randomized unblinded study of 30 healthy staff volunteers from a major trauma center emergency department (ED) in Sydney, Australia. The main outcome measure is fractional expired oxygen concentration (FeO2 ) measured after a 3-minute period of tidal volume breathing with seven different preoxygenation strategies. RESULTS The mean FeO2 achieved with the anesthetic circuit was 81.0% (95% confidence interval [CI] = 78.3% to 83.6%), bag-valve-mask (BVM) 80.1% (95% CI = 76.5% to 83.6%), BVM with nasal cannula (NC) 74.8% (95% CI = 72.0% to 77.6%), BVM with positive end-expiratory pressure valve (PEEP) 78.9% (95% CI = 75.4% to 82.3%), BVM + NC + PEEP 75.5% (95% CI = 72.2% to 78.9%), nonrebreather mask (NRM) 51.6% (95% CI = 48.8% to 54.4%), and NRM + NC 57.1% (95% CI = 52.9% to 61.2%). Preoxygenation efficacy with BVM strategies was significantly greater than NRM strategies (p < 0.01) and noninferior to the anesthetic circuit. CONCLUSIONS In healthy volunteers, the effectiveness of BVM preoxygenation was comparable to the anesthetic circuit (criterion standard) and superior to preoxygenation with NRM. The addition of NC oxygen, PEEP, or both did not improve the efficacy of the BVM device.
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Affiliation(s)
- Christopher Groombridge
- Emergency Department; Liverpool Hospital; Sydney New South Wales Australia
- CareFlight; Medical Retrieval Service; Sydney New South Wales Australia
| | - Cheau Wern Chin
- Emergency Department; Liverpool Hospital; Sydney New South Wales Australia
| | - Bernard Hanrahan
- Department of Anaesthesia; Liverpool Hospital; Sydney New South Wales Australia
- CareFlight; Medical Retrieval Service; Sydney New South Wales Australia
| | - Anna Holdgate
- Emergency Department; Liverpool Hospital; Sydney New South Wales Australia
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Abstract
Clinical question Does delayed sequence intubation (DSI) improve preoxygenation and safety when intubating otherwise uncooperative patients? Article chosen Weingart SD, Trueger S, Wong N, et al. Delayed sequence intubation: a prospective observational study. Ann Emerg Med 2015;65(4):349-55. doi:10.1016/j.annemergmed.2014.09.025 OBJECTIVE: To investigate whether the administration of ketamine 3 minutes prior to the administration of a muscle relaxant allows for optimal preoxygenation in uncooperative patients undergoing intubation.
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Mosier JM, Joshi R, Hypes C, Pacheco G, Valenzuela T, Sakles JC. The Physiologically Difficult Airway. West J Emerg Med 2015; 16:1109-17. [PMID: 26759664 PMCID: PMC4703154 DOI: 10.5811/westjem.2015.8.27467] [Citation(s) in RCA: 111] [Impact Index Per Article: 12.3] [Reference Citation Analysis] [Abstract] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/13/2015] [Revised: 08/16/2015] [Accepted: 08/17/2015] [Indexed: 12/28/2022] Open
Abstract
Airway management in critically ill patients involves the identification and management of the potentially difficult airway in order to avoid untoward complications. This focus on difficult airway management has traditionally referred to identifying anatomic characteristics of the patient that make either visualizing the glottic opening or placement of the tracheal tube through the vocal cords difficult. This paper will describe the physiologically difficult airway, in which physiologic derangements of the patient increase the risk of cardiovascular collapse from airway management. The four physiologically difficult airways described include hypoxemia, hypotension, severe metabolic acidosis, and right ventricular failure. The emergency physician should account for these physiologic derangements with airway management in critically ill patients regardless of the predicted anatomic difficulty of the intubation.
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Affiliation(s)
- Jarrod M Mosier
- University of Arizona, Department of Emergency Medicine, Tucson, Arizona; University of Arizona, Department of Medicine, Division of Pulmonary, Critical Care, Allergy and Sleep, Tucson, Arizona
| | - Raj Joshi
- University of Arizona, Department of Emergency Medicine, Tucson, Arizona; University of Arizona, Department of Medicine, Division of Pulmonary, Critical Care, Allergy and Sleep, Tucson, Arizona
| | - Cameron Hypes
- University of Arizona, Department of Emergency Medicine, Tucson, Arizona; University of Arizona, Department of Medicine, Division of Pulmonary, Critical Care, Allergy and Sleep, Tucson, Arizona
| | - Garrett Pacheco
- University of Arizona, Department of Emergency Medicine, Tucson, Arizona
| | - Terence Valenzuela
- University of Arizona, Department of Emergency Medicine, Tucson, Arizona
| | - John C Sakles
- University of Arizona, Department of Emergency Medicine, Tucson, Arizona
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Preoxygenation by spontaneous breathing or noninvasive positive pressure ventilation with and without positive end-expiratory pressure. Eur J Anaesthesiol 2015. [DOI: 10.1097/eja.0000000000000297] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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74
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Frerk C, Mitchell VS, McNarry AF, Mendonca C, Bhagrath R, Patel A, O'Sullivan EP, Woodall NM, Ahmad I. Difficult Airway Society 2015 guidelines for management of unanticipated difficult intubation in adults. Br J Anaesth 2015; 115:827-48. [PMID: 26556848 PMCID: PMC4650961 DOI: 10.1093/bja/aev371] [Citation(s) in RCA: 1191] [Impact Index Per Article: 132.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 09/28/2015] [Indexed: 02/06/2023] Open
Abstract
These guidelines provide a strategy to manage unanticipated difficulty with tracheal intubation. They are founded on published evidence. Where evidence is lacking, they have been directed by feedback from members of the Difficult Airway Society and based on expert opinion. These guidelines have been informed by advances in the understanding of crisis management; they emphasize the recognition and declaration of difficulty during airway management. A simplified, single algorithm now covers unanticipated difficulties in both routine intubation and rapid sequence induction. Planning for failed intubation should form part of the pre-induction briefing, particularly for urgent surgery. Emphasis is placed on assessment, preparation, positioning, preoxygenation, maintenance of oxygenation, and minimizing trauma from airway interventions. It is recommended that the number of airway interventions are limited, and blind techniques using a bougie or through supraglottic airway devices have been superseded by video- or fibre-optically guided intubation. If tracheal intubation fails, supraglottic airway devices are recommended to provide a route for oxygenation while reviewing how to proceed. Second-generation devices have advantages and are recommended. When both tracheal intubation and supraglottic airway device insertion have failed, waking the patient is the default option. If at this stage, face-mask oxygenation is impossible in the presence of muscle relaxation, cricothyroidotomy should follow immediately. Scalpel cricothyroidotomy is recommended as the preferred rescue technique and should be practised by all anaesthetists. The plans outlined are designed to be simple and easy to follow. They should be regularly rehearsed and made familiar to the whole theatre team.
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Affiliation(s)
- C Frerk
- Department of Anaesthesia, Northampton General Hospital, Billing Road, Northampton NN1 5BD, UK
| | - V S Mitchell
- Department of Anaesthesia and Perioperative Medicine, University College London Hospitals NHS Foundation Trust, 235 Euston Road, London NW1 2BU, UK
| | - A F McNarry
- Department of Anaesthesia, NHS Lothian, Crewe Road South, Edinburgh EH4 2XU, UK
| | - C Mendonca
- Department of Anaesthesia, University Hospitals Coventry & Warwickshire NHS Trust, Clifford Bridge Road, Coventry CV2 2DX, UK
| | - R Bhagrath
- Department of Anaesthesia, Barts Health, West Smithfield, London EC1A 7BE, UK
| | - A Patel
- Department of Anaesthesia, The Royal National Throat Nose and Ear Hospital, 330 Grays Inn Road, London WC1X 8DA, UK
| | - E P O'Sullivan
- Department of Anaesthesia, St James's Hospital, PO Box 580, James's Street, Dublin 8, Ireland
| | - N M Woodall
- Department of Anaesthesia, The Norfolk and Norwich University Hospitals NHS Foundation Trust, Colney Lane, Norwich NR4 7UY, UK
| | - I Ahmad
- Department of Anaesthesia, Guy's and St Thomas' NHS Foundation Trust, Great Maze Pond, London SE1 9RT, UK
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Sreejit MS, Ramkumar V. Effect of positive airway pressure during pre-oxygenation and induction of anaesthesia upon safe duration of apnoea. Indian J Anaesth 2015; 59:216-21. [PMID: 25937647 PMCID: PMC4408649 DOI: 10.4103/0019-5049.154998] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022] Open
Abstract
BACKGROUND AND AIMS Induction of general anaesthesia per se as also the use of 100% oxygen during induction of anaesthesia, results in the development of atelectasis in dependent lung regions within minutes of anaesthetic induction. We aimed to assess the effect of application of a continuous positive airway pressure (CPAP) of 5 cm H2O during pre-oxygenation and induction of anaesthesia on the period of apnoea before the occurrence of clinically significant desaturation. METHODS In this prospective, randomised, and double-blind study, 40 patients posted for elective surgery were enrolled. Duration of apnoea was measured as the time from the administration of succinylcholine hydrochloride to the time when oxygen saturation fell to 93%. Student's t-test was used for comparing the duration of apnoea. RESULTS The safe duration of apnoea was found to be significantly longer in patients receiving CPAP of 5 cm H2O (Group P; n = 16) compared to the group receiving no CPAP (Group Z; n = 20), that is, 496.56 ± 71.68 s versus 273.00 ± 69.31 s (P < 0.001). CONCLUSION The application of CPAP of 5 cm H2O using a Mapleson A circuit with a fixed positive end-expiratory pressure device during 5 min of pre-oxygenation with 100% oxygen prior to the induction of anaesthesia provides a clearly longer duration of apnoea before clinically significant arterial desaturation occurs.
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Affiliation(s)
- Melveetil S Sreejit
- Department of Anaesthesiology, MES Medical College and Hospital, Perinthalmanna, Malappuram, Kerala, India
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Martin DS, Grocott MPW. Oxygen therapy and anaesthesia: too much of a good thing? Anaesthesia 2015; 70:522-7. [DOI: 10.1111/anae.13081] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Affiliation(s)
- D. S. Martin
- Royal Free Perioperative Research Group; Anaesthetic Department; Royal Free Hospital; London UK
- University College London Centre for Altitude Space and Extreme Environment Medicine; UCLH NIHR Biomedical Research Centre; Institute of Sport and Exercise Health; London UK
| | - M. P. W. Grocott
- Integrative Physiology and Critical Illness Group; Clinical and Experimental Sciences; Faculty of Medicine; University of Southampton; UK
- University Hospital Southampton NHS Foundation Trust / University of Southampton; NIHR Respiratory Biomedical Research Unit; Southampton UK
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Lerant AA, Hester RL, Coleman TG, Phillips WJ, Orledge JD, Murray WB. Preventing and Treating Hypoxia: Using a Physiology Simulator to Demonstrate the Value of Pre-Oxygenation and the Futility of Hyperventilation. Int J Med Sci 2015; 12:625-32. [PMID: 26283881 PMCID: PMC4532969 DOI: 10.7150/ijms.12077] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/09/2015] [Accepted: 07/07/2015] [Indexed: 11/12/2022] Open
Abstract
INTRODUCTION Insufficient pre-oxygenation before emergency intubation, and hyperventilation after intubation are mistakes that are frequently observed in and outside the operating room, in clinical practice and in simulation exercises. Physiological parameters, as appearing on standard patient monitors, do not alert to the deleterious effects of low oxygen saturation on coronary perfusion, or that of low carbon dioxide concentrations on cerebral perfusion. We suggest the use of HumMod, a computer-based human physiology simulator, to demonstrate beneficial physiological responses to pre-oxygenation and the futility of excessive minute ventilation after intubation. METHODS We programmed HumMod, to A.) compare varying times (0-7 minutes) of pre-oxygenation on oxygen saturation (SpO2) during subsequent apnoea; B.) simulate hyperventilation after apnoea. We compared the effect of different minute ventilation rates on SpO2, acid-base status, cerebral perfusion and other haemodynamic parameters. RESULTS A.) With no pre-oxygenation, starting SpO2 dropped from 98% to 90% in 52 seconds with apnoea. At the other extreme, following full pre-oxygenation with 100% O2 for 3 minutes or more, the SpO2 remained 100% for 7.75 minutes during apnoea, and dropped to 90% after another 75 seconds. B.) Hyperventilation, did not result in more rapid normalization of SpO2, irrespective of the level of minute ventilation. However, hyperventilation did cause significant decreases in cerebral blood flow (CBF). CONCLUSIONS HumMod accurately simulates the physiological responses compared to published human studies of pre-oxygenation and varying post intubation minute ventilations, and it can be used over wider ranges of parameters than available in human studies and therefore available in the literature.
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Affiliation(s)
- Anna A Lerant
- 2. Department of Anaesthesiology, Cleveland Clinic, Cleveland, OH, USA
| | - Robert L Hester
- 1. Department of Physiology and Biophysics, University of Mississippi Medical Center, University of Mississippi Medical Center, MS
| | - Thomas G Coleman
- 1. Department of Physiology and Biophysics, University of Mississippi Medical Center, University of Mississippi Medical Center, MS
| | | | - Jeffrey D Orledge
- 3. Department of Emergency Medicine, University of Mississippi Medical Center, University of Mississippi Medical Center, MS, USA
| | - W Bosseau Murray
- 4. Clinical Simulation Centre, Pennsylvania State University College of Medicine, Hershey, PA, USA
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Sherren PB, Tricklebank S, Glover G. Development of a standard operating procedure and checklist for rapid sequence induction in the critically ill. Scand J Trauma Resusc Emerg Med 2014; 22:41. [PMID: 25209044 PMCID: PMC4172951 DOI: 10.1186/s13049-014-0041-7] [Citation(s) in RCA: 42] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/02/2014] [Accepted: 07/15/2014] [Indexed: 01/01/2023] Open
Abstract
INTRODUCTION Rapid sequence induction (RSI) of critically ill patients outside of theatres is associated with a higher risk of hypoxia, cardiovascular collapse and death. In the prehospital and military environments, there is an increasing awareness of the benefits of standardised practice and checklists. METHODS We conducted a non-systematic review of literature pertaining to key components of RSI preparation and management. A standard operating procedure (SOP) for in-hospital RSI was developed based on this and experience from large teaching hospital anaesthesia and critical care departments. RESULTS The SOP consists of a RSI equipment set-up sheet, pre-RSI checklist and failed airway algorithm. The SOP should improve RSI preparation, crew resource management and first pass intubation success while minimising adverse events. CONCLUSION Based on the presented literature, we believe the evidence is sufficient to recommend adoption of the core components in the suggested SOP. This standardised approach to RSI in the critically ill may reduce the current high incidence of adverse events and hopefully improve patient outcomes.
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Affiliation(s)
- Peter Brendon Sherren
- />Kings Health Partners, Department of Anaesthesia and Critical Care, Guy’s and St Thomas NHS Foundation Trust, London, SE1 9RT UK
- />Department of Anaesthesia, The Royal London hospital, Whitechapel road, London, E1 1BB UK
| | - Stephen Tricklebank
- />Kings Health Partners, Department of Anaesthesia and Critical Care, Guy’s and St Thomas NHS Foundation Trust, London, SE1 9RT UK
| | - Guy Glover
- />Kings Health Partners, Department of Anaesthesia and Critical Care, Guy’s and St Thomas NHS Foundation Trust, London, SE1 9RT UK
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Edmark L, Auner U, Hallén J, Lassinantti-Olowsson L, Hedenstierna G, Enlund M. A ventilation strategy during general anaesthesia to reduce postoperative atelectasis. Ups J Med Sci 2014; 119:242-50. [PMID: 24758245 PMCID: PMC4116764 DOI: 10.3109/03009734.2014.909546] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/10/2013] [Accepted: 03/25/2014] [Indexed: 11/13/2022] Open
Abstract
BACKGROUND Atelectasis is common during and after general anaesthesia. We hypothesized that a ventilation strategy, without recruitment manoeuvres, using a combination of continuous positive airway pressure (CPAP) or positive end-expiratory pressure (PEEP) and a reduced end-expiratory oxygen fraction (FETO2) before ending mask ventilation with CPAP after extubation would reduce the area of postoperative atelectasis. METHODS Thirty patients were randomized into three groups. During induction and emergence, inspiratory oxygen fractions (FIO2) were 1.0 in the control group and 1.0 or 0.8 in the intervention groups. No CPAP/PEEP was used in the control group, whereas CPAP/PEEP of 6 cmH2O was used in the intervention groups. After extubation, FIO2 was set to 0.30 in the intervention groups and CPAP was applied, aiming at FETO2 < 0.30. Atelectasis was studied by computed tomography 25 min postoperatively. RESULTS The median area of atelectasis was 5.2 cm(2) (range 1.6-12.2 cm(2)) and 8.5 cm(2) (3-23.1 cm(2)) in the groups given FIO2 1.0 with or without CPAP/PEEP, respectively. After correction for body mass index the difference between medians (2.9 cm(2)) was statistically significant (confidence interval 0.2-7.6 cm(2), p = 0.04). In the group given FIO2 0.8, in which seven patients were ex- or current smokers, the median area of atelectasis was 8.2 cm(2) (1.8-14.7 cm(2)). CONCLUSION Compared with conventional ventilation, after correction for obesity, this ventilation strategy reduced the area of postoperative atelectasis in one of the intervention groups but not in the other group, which included a higher proportion of smokers.
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Affiliation(s)
- Lennart Edmark
- Department of Anaesthesiology and Intensive Care, Västmanlands Sjukhus Köping, Köping, Sweden
- Department of Medical Sciences, Clinical Physiology, University Hospital, Uppsala, Sweden
| | - Udo Auner
- Department of Radiology, Västmanlands Sjukhus Västerås, Västerås, Sweden
| | - Jan Hallén
- Department of Anaesthesiology and Intensive Care, University Hospital, Örebro, Sweden
| | | | - Göran Hedenstierna
- Department of Medical Sciences, Clinical Physiology, University Hospital, Uppsala, Sweden
| | - Mats Enlund
- Centre for Clinical Research, Västmanlands Sjukhus Västerås, Västerås, Sweden
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Russell T, Ng L, Nathan E, Debenham E. Supplementation of standard pre-oxygenation with nasal prong oxygen or machine oxygen flush during a simulated leak scenario. Anaesthesia 2014; 69:1133-7. [DOI: 10.1111/anae.12630] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 02/03/2014] [Indexed: 11/26/2022]
Affiliation(s)
- T. Russell
- King Edward Memorial Hospital; Western Australia Australia
- Sir Charles Gairdner Hospital; Nedlands Western Australia Australia
| | - L. Ng
- King Edward Memorial Hospital; Western Australia Australia
| | - E. Nathan
- Women and Infants Research Foundation; Subiaco Western Australia Australia
| | - E. Debenham
- King Edward Memorial Hospital; Western Australia Australia
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Cesarean delivery under general anesthesia: Continuing Professional Development. Can J Anaesth 2014; 61:489-503. [DOI: 10.1007/s12630-014-0125-x] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/03/2013] [Accepted: 02/13/2014] [Indexed: 12/15/2022] Open
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Incidence and prediction of inadequate preoxygenation before induction of anaesthesia. ACTA ACUST UNITED AC 2014; 33:e55-8. [DOI: 10.1016/j.annfar.2013.12.018] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/27/2013] [Accepted: 12/30/2013] [Indexed: 11/22/2022]
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85
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De Jong A, Jung B, Jaber S. Intubation in the ICU: we could improve our practice. CRITICAL CARE : THE OFFICIAL JOURNAL OF THE CRITICAL CARE FORUM 2014; 18:209. [PMID: 25029179 PMCID: PMC4057212 DOI: 10.1186/cc13776] [Citation(s) in RCA: 54] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
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Grocott HP. From the Journal archives: Airway closure and lung volumes in surgical positions. Can J Anaesth 2014; 61:383-6. [PMID: 24442988 DOI: 10.1007/s12630-013-0098-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/08/2013] [Accepted: 12/11/2013] [Indexed: 11/25/2022] Open
Abstract
AUTHORS Douglas B. Craig, W.M. Wahba, Hillary Don CITATION Can Anaesth Soc J 1971; 18: 92-9. PURPOSE Surgery and anesthesia expose patients to moderate and sometimes extreme positioning changes that are often unphysiological. The purpose of this article is to highlight and contextualize a seminal study from the Journal archives that explores the effect of several commonly utilized surgical positions (supine, Trendelenburg and lithotomy) and age on basic lung volumes as well as the volume at which small airway closure (AC) (also known as closing volume [CV]) occurs. These factors were examined with the aim of determining which patient position variables could be of clinical significance to gas exchange in the perioperative period. PRINCIPAL FINDINGS This work showed that supine positioning, when compared with the seated position, results in a decrease of all lung volumes and capacities, including functional residual capacity (FRC) and CV. Trendelenburg positioning further decreases FRC, with no further changes induced by lithotomy positioning. Age is a clinically important factor in AC, occurring within the tidal volume range at a lower age when supine as compared with the seated position. CONCLUSIONS The work of Drs. D. Craig et al. published in the Journal more than 40 years ago was seminal to our understanding of how patient positioning has an important influence on lung volumes and on the age-related relationship between FRC and CV.
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Affiliation(s)
- Hilary P Grocott
- Departments of Anesthesia & Perioperative Medicine and Surgery, St. Boniface Hospital, University of Manitoba, CR3008 - 369 Tache Avenue, Winnipeg, MB, R2H 2A6, Canada,
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Law JA, Broemling N, Cooper RM, Drolet P, Duggan LV, Griesdale DE, Hung OR, Jones PM, Kovacs G, Massey S, Morris IR, Mullen T, Murphy MF, Preston R, Naik VN, Scott J, Stacey S, Turkstra TP, Wong DT. The difficult airway with recommendations for management--part 2--the anticipated difficult airway. Can J Anaesth 2013; 60:1119-38. [PMID: 24132408 PMCID: PMC3825645 DOI: 10.1007/s12630-013-0020-x] [Citation(s) in RCA: 177] [Impact Index Per Article: 16.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/28/2013] [Accepted: 08/13/2013] [Indexed: 12/11/2022] Open
Abstract
BACKGROUND Appropriate planning is crucial to avoid morbidity and mortality when difficulty is anticipated with airway management. Many guidelines developed by national societies have focused on management of difficulty encountered in the unconscious patient; however, little guidance appears in the literature on how best to approach the patient with an anticipated difficult airway. METHODS To review this and other subjects, the Canadian Airway Focus Group (CAFG) was re-formed. With representation from anesthesiology, emergency medicine, and critical care, CAFG members were assigned topics for review. As literature reviews were completed, results were presented and discussed during teleconferences and two face-to-face meetings. When appropriate, evidence- or consensus-based recommendations were made, and levels of evidence were assigned. PRINCIPAL FINDINGS Previously published predictors of difficult direct laryngoscopy are widely known. More recent studies report predictors of difficult face mask ventilation, video laryngoscopy, use of a supraglottic device, and cricothyrotomy. All are important facets of a complete airway evaluation and must be considered when difficulty is anticipated with airway management. Many studies now document the increasing patient morbidity that occurs with multiple attempts at tracheal intubation. Therefore, when difficulty is anticipated, tracheal intubation after induction of general anesthesia should be considered only when success with the chosen device(s) can be predicted in a maximum of three attempts. Concomitant predicted difficulty using oxygenation by face mask or supraglottic device ventilation as a fallback makes an awake approach advisable. Contextual issues, such as patient cooperation, availability of additional skilled help, and the clinician's experience, must also be considered in deciding the appropriate strategy. CONCLUSIONS With an appropriate airway evaluation and consideration of relevant contextual issues, a rational decision can be made on whether an awake approach to tracheal intubation will maximize patient safety or if airway management can safely proceed after induction of general anesthesia. With predicted difficulty, close attention should be paid to details of implementing the chosen approach. This should include having a plan in case of the failure of tracheal intubation or patient oxygenation.
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Affiliation(s)
- J Adam Law
- Department of Anesthesia, Queen Elizabeth II Health Sciences Centre, Dalhousie University, Halifax Infirmary Site, 1796 Summer Street, Halifax, NS, B3H 3A7, Canada,
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Coisel Y, Galia F, Conseil M, Jung B, Chanques G, Jaber S. [Risk of barotrauma when using non-reinhalation Waters valves: a comparative study on bench test]. ACTA ACUST UNITED AC 2013; 32:749-55. [PMID: 24138768 DOI: 10.1016/j.annfar.2013.07.814] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/18/2013] [Accepted: 07/16/2013] [Indexed: 10/26/2022]
Abstract
OBJECTIVE Manual ventilation is delivered in the operating room or the intensive care unit to intubated or non-intubated patients, using non-rebreathing systems such as the Waters valve. New generation Waters valves are progressively replacing the historic Waters valve. The aim of this study was to evaluate maximal pressure delivered by these 2 valves. TYPE OF STUDY Bench test. MATERIAL AND METHOD Thirty-two different conditions were tested, according to 2 oxygen flow rates (10 and 20L/min), without (static condition) or with manual insufflations (dynamic condition) and 4 valve expiratory opening pressures. The primary endpoint was maximal pressure measured at the exit of the valve, connected to a model lung and a bench test. RESULTS Measured pressures were different for most evaluated conditions. Increasing oxygen flow from 10 to 20L/min increased maximal pressure for both valves. Increasing valve expiratory opening pressure induced a significant increase in maximal pressure for the new generation valve (from 4 to 61cmH2O in static conditions and from 18 to 68cmH2O in dynamic conditions). For the historic valve, maximal pressure increased significantly but remained below 15cmH2O in both static and dynamic conditions. CONCLUSION Use of new generation Waters valves should be different from historic Waters valves. Indeed, barotrauma could be caused by badly adapted valve expiratory opening pressure settings.
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Affiliation(s)
- Y Coisel
- Département d'anesthésie-réanimation St-Éloi, CHU de Montpellier, 80, avenue Augustin-Fliche, 34295 Montpellier cedex 5, France; Inserm U1046, université Montpellier 1, 34000 Montpellier, France
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Airway management and oxygenation in obese patients. Can J Anaesth 2013; 60:929-45. [DOI: 10.1007/s12630-013-9991-x] [Citation(s) in RCA: 54] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/06/2013] [Accepted: 06/17/2013] [Indexed: 12/17/2022] Open
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What is the accuracy of the high-fidelity METI Human Patient Simulator physiological models during oxygen administration and apnea maneuvers? Anesth Analg 2013; 117:392-7. [PMID: 23744955 DOI: 10.1213/ane.0b013e3182991c2d] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
BACKGROUND A widely used physiological simulator is generally accepted to give valid predictions of oxygenation status during disturbances in breathing associated with anesthesia. We compared predicted measures with physiological measurements available in the literature, or derived from other models. METHODS Five studies were selected from the literature which explored arterial oxygenation, with or without preoxygenation, in clinical situations or through mathematical modeling as well as the evolution of the fraction of expired oxygen (Feo2) during preoxygenation maneuvers. Scenarios from these studies were simulated on the METI-Human Patient Simulator™ simulator, and the data were compared with the results in the literature. RESULTS Crash-induction anesthesia without preoxygenation induces an O2 pulse saturation (Spo2) decrease that is not observed on the METI simulator. In humans, after 8 minutes of apnea, Spo2 decreased below 90% while the worst value was 95% during the simulation. The apnea time to reach 85% was less with obese patients than with healthy simulated patients and was shortened in the absence of preoxygenation. However, the data in the literature include METI simulator confidence interval 95% values only for healthy humans receiving preoxygenation. The decrease in Pao2 during 35-second apnea started at end-expiration was slower on the METI simulator than the values reported in the literature. Feo2 evolution during preoxygenation maneuvers on the METI simulator with various inspired oxygen fractions (100%, 92%, 84%, and 68%) was very close to those reported in humans when perfect mask seal is provided. In practice, this seal is impossible to obtain on the METI simulator. CONCLUSIONS Spo2 decreased much later during apnea on the METI simulator than in a clinical situation, whether preoxygenation was performed or not. The debriefing after simulation of critical situations or the use of the METI simulator to test a new equipment must consider these results.
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Higher fraction of inspired oxygen in anesthesia induction does not affect functional residual capacity reduction after intubation: a comparative study of higher and lower oxygen concentration. J Anesth 2013; 27:385-9. [DOI: 10.1007/s00540-012-1547-7] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/14/2012] [Accepted: 12/16/2012] [Indexed: 10/27/2022]
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Cook T, MacDougall-Davis S. Complications and failure of airway management. Br J Anaesth 2012; 109 Suppl 1:i68-i85. [DOI: 10.1093/bja/aes393] [Citation(s) in RCA: 269] [Impact Index Per Article: 22.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022] Open
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Georgescu M, Tanoubi I, Fortier LP, Donati F, Drolet P. Efficacy of preoxygenation with non-invasive low positive pressure ventilation in obese patients: Crossover physiological study. ACTA ACUST UNITED AC 2012; 31:e161-5. [DOI: 10.1016/j.annfar.2012.05.003] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/10/2012] [Accepted: 05/18/2012] [Indexed: 11/28/2022]
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Prossliner H, Braun P, Paal P. Anaesthesia in medical emergencies. TRENDS IN ANAESTHESIA AND CRITICAL CARE 2012. [DOI: 10.1016/j.tacc.2012.01.002] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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Jung B, Azuelos I, Chanques G, Jaber S. How to improve preoxygenation before intubation in patients at risk? TRENDS IN ANAESTHESIA AND CRITICAL CARE 2012. [DOI: 10.1016/j.tacc.2011.09.002] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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Preoxygenation and prevention of desaturation during emergency airway management. Ann Emerg Med 2011; 59:165-75.e1. [PMID: 22050948 DOI: 10.1016/j.annemergmed.2011.10.002] [Citation(s) in RCA: 314] [Impact Index Per Article: 24.2] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/25/2011] [Revised: 09/28/2011] [Accepted: 10/04/2011] [Indexed: 11/23/2022]
Abstract
Patients requiring emergency airway management are at great risk of hypoxemic hypoxia because of primary lung pathology, high metabolic demands, anemia, insufficient respiratory drive, and inability to protect their airway against aspiration. Tracheal intubation is often required before the complete information needed to assess the risk of periprocedural hypoxia is acquired, such as an arterial blood gas level, hemoglobin value, or even a chest radiograph. This article reviews preoxygenation and peri-intubation oxygenation techniques to minimize the risk of critical hypoxia and introduces a risk-stratification approach to emergency tracheal intubation. Techniques reviewed include positioning, preoxygenation and denitrogenation, positive end expiratory pressure devices, and passive apneic oxygenation.
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Loubert C, Fernando R. Cesarean delivery in the obese parturient: anesthetic considerations. WOMENS HEALTH 2011; 7:163-79. [PMID: 21410344 DOI: 10.2217/whe.10.77] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Obesity is a worldwide health problem and its prevalence is reaching epidemic proportions. As obesity does not spare women of childbearing age, obstetric anesthesiologists will increasingly be exposed to the challenges of anesthesia in this population. The purpose of this article is to give the reader a thorough understanding of the anesthetic implications of obesity relating to cesarean deliveries. Obesity is associated with hypertension, diabetes, obstructive sleep apnea and other comorbidities. It increases the risk of cesarean delivery, postpartum wound infections and deep venous thromboembolism. Obese parturients are prone to anesthetic complications such as aspiration of gastric contents, difficult monitoring, positioning, airway management and challenging neuraxial techniques. A thorough precesarean delivery preparation should include an evaluation by an anesthesiologist for women with a BMI over 40 kg/m² and institution of an antacid prophylaxis protocol, thromboprophylaxis and antibiotic prophylaxis. Regional anesthesia should ideally be used in all obese parturients unless contraindicated. The goals of postpartum care include efficacious analgesia, physiotherapy and early mobilization. Monitoring and vigilance in an intensive care unit or step-down units should be considered for morbidly obese women.
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Affiliation(s)
- Christian Loubert
- Anesthetic Department, University College London Hospitals, 235 Euston Road, London NW12BU, UK
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Abstract
PURPOSE OF REVIEW Recently, notable progress has been made in the field of anesthesia drugs and airway management. RECENT FINDINGS Anesthesia in prehospital emergencies and in the emergency department is reviewed and guidelines are discussed. SUMMARY Preoxygenation should be performed with high-flow oxygen delivered through a tight-fitting face mask with a reservoir. Ketamine may be the induction agent of choice in hemodynamically unstable patients. The rocuronium antagonist sugammadex may have the potential to make rocuronium a first-line neuromuscular blocking agent in emergency induction. Experienced healthcare providers may consider prehospital anesthesia induction. Moderately experienced healthcare providers should optimize oxygenation, hasten hospital transfer and only try to intubate a patient whose life is threatened. When intubation fails twice, ventilation should be performed with an alternative supraglottic airway or a bag-valve-mask device. Lesser experienced healthcare providers should completely refrain from intubation, optimize oxygenation, hasten hospital transfer and ventilate patients only in life-threatening circumstances with a supraglottic airway or a bag-valve-mask device. Senior help should be sought early. In a 'cannot ventilate-cannot intubate' situation, a supraglottic airway should be employed and, if ventilation is still unsuccessful, a surgical airway should be performed. Capnography should be used in every ventilated patient. Clinical practice is essential to retain anesthesia and airway management skills.
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Current World Literature. Curr Opin Anaesthesiol 2010; 23:532-8. [DOI: 10.1097/aco.0b013e32833c5ccf] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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