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Singh P, Liew W, Negar A. Airway management in patients suffering from morbid obesity. Saudi J Anaesth 2022; 16:314-321. [PMID: 35898526 PMCID: PMC9311184 DOI: 10.4103/sja.sja_90_22] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/29/2021] [Revised: 02/01/2022] [Accepted: 02/03/2022] [Indexed: 11/04/2022] Open
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Abstract
Initiation of preoxygenation prior to anesthetic induction and tracheal intubation is a commonly recognized technique intended to boost oxygen reservoirs in the body and thus slow the progression of desaturation of arterial hemoglobin at times of apnea. Even though challenges associated with ventilation and intubation are inconsistent, it is preferable for all patients to necessitate preoxygenation. The effectiveness of preoxygenation is measured by its performance and efficiency. Determinant factors of efficacy indices include rises in the alveolar O2 fraction (FAO2), reductions in the alveolar nitrogen fraction (FAN2), and improvements in the arterial O2 stress (PAO2). The effectiveness or efficiency of preoxygenation during apnea is evaluated from the declining trend in level of oxyhemoglobin desaturation (SAO2). The maximal risk associated with preoxygenation generally comprises delayed diagnosis of oesophageal intubation, absorption atelectasis, generation of reactive oxygen species, and incidences of adverse hemodynamic results. Since the time of preoxygenation is minimal, there are limited hemodynamic effects and the aggregation of reactive oxygen species to counteract its effectiveness. In general, three methods of preoxygenation techniques are followed for the routine procedures, namely, deep breathing, rapid breathing at fraction of inspired oxygen (FiO2) of 1 for two to five minutes, and the four vital capacities method. Health professionals, especially anesthesiologists specialized in Ear Nose and Throat (ENT) and traumatology, must be empowered by alternative methods like trans-tracheal ventilation to resolve life-threatening medical emergencies. Equipment accessibility and needful training are two essential components that are recommended for significant preparedness. The present article reviews the advantages conferred by the preoxygenation techniques with special attention to the high-risk population. It also details the inadequacies and the risks associated with the preoxygenation technique.
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Castro de Oliveira BM, de Souza RLP. Advantages of Delayed Sequence Intubation in Selected Patients With COVID-19. Anesth Analg 2020; 131:e133-e134. [PMID: 32412923 DOI: 10.1213/ane.0000000000004977] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
Affiliation(s)
| | - Renato Lucas Passos de Souza
- Departmento de Anestesiologia, Hospital das Clínicas da Faculdade de Medicina de Ribeirão Preto, Universidade de São Paulo, São Paulo, Brazil
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De Jong A, Futier E, Millot A, Coisel Y, Jung B, Chanques G, Baillard C, Jaber S. How to preoxygenate in operative room: healthy subjects and situations "at risk". ACTA ACUST UNITED AC 2014; 33:457-61. [PMID: 25168301 DOI: 10.1016/j.annfar.2014.08.001] [Citation(s) in RCA: 62] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
Intubation is one of the most common procedures performed in operative rooms. It can be associated with life-threatening complications when difficult airway access occurs, in patients who cannot tolerate even a slight hypoxemia or when performed in patients at risk of oxygen desaturation during intubation, as obese, critically-ill and pregnant patients. To improve intubation safety, preoxygenation is a major technique, extending the duration of safe apnoea, defined as the time until a patient reaches an arterial saturation level of 88% to 90%, to allow for placement of a definitive airway. Preoxygenation consists in increasing the lung stores of oxygen, located in the functional residual capacity, and helps preventing hypoxia that may occur during intubation attempts. Obese, critically-ill and pregnant patients are especially at risk of reduced effectiveness of preoxygenation because of pathophysiological modifications (reduced functional residual capacity (FRC), increased risk of atelectasis, shunt). Three minutes tidal volume breathing or 3-8 vital capacities are recommended in general population, mostly allowing achieving a 90% end-tidal oxygen level. Recent studies have indicated that in order to maximize the value of preoxygenation (i.e, oxygenation stores) obese and critically-ill patients can benefit from the combination of breathing 100% oxygen and non-invasive positive pressure ventilation (NIV) with end-expiratory positive pressure (PEEP) in the proclive position (Trendelenburg reverse). Recruitment manoeuvres may be of interest immediately after intubation to limit the risk of lung derecruitment. Further studies are needed in the field of preoxygenation in pregnant women.
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Affiliation(s)
- A De Jong
- Unité Inserm U1046, Anesthesiology and Intensive Care, Anesthesia and Critical Care Department B, Saint-Eloi Teaching Hospital, Université Montpellier 1, Université Montpellier 2, CHU de Montpellier, 80, avenue Augustin-Fliche, 34295 Montpellier, France
| | - E Futier
- Département d'Anesthésie et Réanimation, Hôpital Estaing, Université de Clermont-Ferrand, 1, rue Lucie-Aubrac, 63100 Clermont-Ferrand, France
| | - A Millot
- Unité Inserm U1046, Anesthesiology and Intensive Care, Anesthesia and Critical Care Department B, Saint-Eloi Teaching Hospital, Université Montpellier 1, Université Montpellier 2, CHU de Montpellier, 80, avenue Augustin-Fliche, 34295 Montpellier, France
| | - Y Coisel
- Unité Inserm U1046, Anesthesiology and Intensive Care, Anesthesia and Critical Care Department B, Saint-Eloi Teaching Hospital, Université Montpellier 1, Université Montpellier 2, CHU de Montpellier, 80, avenue Augustin-Fliche, 34295 Montpellier, France
| | - B Jung
- Unité Inserm U1046, Anesthesiology and Intensive Care, Anesthesia and Critical Care Department B, Saint-Eloi Teaching Hospital, Université Montpellier 1, Université Montpellier 2, CHU de Montpellier, 80, avenue Augustin-Fliche, 34295 Montpellier, France
| | - G Chanques
- Unité Inserm U1046, Anesthesiology and Intensive Care, Anesthesia and Critical Care Department B, Saint-Eloi Teaching Hospital, Université Montpellier 1, Université Montpellier 2, CHU de Montpellier, 80, avenue Augustin-Fliche, 34295 Montpellier, France
| | - C Baillard
- EA 3409, Department of Anesthesiology and critical care medicine, Avicenne university hospital, Paris-13 university, AP-HP, 125, route de Stalingrad, 93009 Bobigny, France
| | - S Jaber
- Unité Inserm U1046, Anesthesiology and Intensive Care, Anesthesia and Critical Care Department B, Saint-Eloi Teaching Hospital, Université Montpellier 1, Université Montpellier 2, CHU de Montpellier, 80, avenue Augustin-Fliche, 34295 Montpellier, France.
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Particularités de la ventilation chez le patient obèse. MEDECINE INTENSIVE REANIMATION 2014. [DOI: 10.1007/s13546-013-0832-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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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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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: 308] [Impact Index Per Article: 23.7] [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: 9] [Impact Index Per Article: 0.7] [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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Tanoubi I, Drolet P, Fortier LP, Donati F. [Inspiratory support versus spontaneous breathing during preoxygenation in healthy subjects. A randomized, double blind, cross-over trial]. ACTA ACUST UNITED AC 2010; 29:198-203. [PMID: 20116969 DOI: 10.1016/j.annfar.2009.11.009] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/10/2009] [Accepted: 11/13/2009] [Indexed: 11/29/2022]
Abstract
OBJECTIVE Applying an inspiratory support (AI) and a positive end expiratory pressure (PEP) could increase the effectiveness of the preoxygenation. STUDY DESIGN This randomized double blinded controlled study compares the impact on the expiratory oxygen fraction (FEO(2)) of two levels of AI with PEP to a traditional preoxygenation. PATIENTS AND METHODS Twenty healthy volunteers were studied. The criteria of exclusion were a body mass index >30, the presence of beard or moustache and the claustrophobia. Each subject went through three modes of preoxygenation during 3 minutes each in a random order: 1-spontaneous ventilation (VS), 2-preoxygenation with AI with 4 cmH(2)O/PEP 4 cmH(2)O (AI-4/PEP-4), 3-preoxygenation with AI with 6 cmH(2)O/PEP 4 cmH(2)O (AI-6/PEP-4). Subject's tolerance and leaks were also noted. RESULTS The FEO(2) at the end of the 3 minutes of preoxygenation was higher (p<0,001) with AI-4/PEP-4 (94+/-3%) and AI-6/PEP-4 (94+/-4%) than with technique VS (89+/-6%). One hundred percent and 90% of the participants reached one FEO(2)=90% with AI-4/PEP-4 and AI-6/PEP-4 respectively vs 65% with VS (p=0.0013). The participants tolerated better the VS and the AI-4/PEP-4 than the AI-6/PEP-4. More leaks were noted with the AI-6/PEP-4 than with the VS and the AI-4/PEP-4. CONCLUSION This study shows applying AI plus PEP during preoxygenation improves its effectiveness in the healthy subjects. It also suggests that, in a population of healthy volunteers, combination AI-4/PEP-4 is preferable to AI-6/PEP-4 because so effective, but better tolerated.
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Affiliation(s)
- I Tanoubi
- Département d'anesthésie, hôpital Maisonneuve-Rosemont, centre hospitalier, université de Montréal, 5415, boulevard de l'Assomption, Montréal, QC, Canada, H1T 2M4.
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Tanoubi I, Drolet P, Donati F. Optimizing preoxygenation in adults. Can J Anaesth 2009; 56:449-66. [PMID: 19399574 DOI: 10.1007/s12630-009-9084-z] [Citation(s) in RCA: 131] [Impact Index Per Article: 8.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/12/2009] [Accepted: 03/13/2009] [Indexed: 11/26/2022] Open
Abstract
PURPOSE Preoxygenation increases oxygen reserves and duration of apnea without desaturation (DAWD), thus it provides valuable additional time to secure the airway. The purpose of this Continuing Professional Development (CPD) module is to examine the various preoxygenation techniques that have been proposed and to assess their effectiveness in healthy adults and in obese, pregnant, and elderly patients. PRINCIPAL FINDINGS The effectiveness of preoxygenation techniques can be evaluated by measuring DAWD, i.e., the time for oxygen saturation to decrease to <90%. Clinically, preoxygenation is considered adequate when end-tidal oxygen fraction is >90%. This is usually achieved with a 3-min tidal volume breathing (TVB) technique. As a rule, asking the patient to take four deep breaths in 30 sec (4 DB 30 sec) yields poorer results. Eight deep breaths in 60 sec (8 DB 60 sec) is equivalent to TVB 3 min. The DAWD is decreased in obese patients, pregnant women, and patients with increased metabolism. Obese patients may benefit from the head-up position and positive pressure breathing. A TVB technique is preferable in the elderly. Failure to preoxygenate is often due to leaks, which commonly occur in edentulous or bearded patients. In cases of difficult preoxygenation, directly applying the circuit to the mouth might be a useful alternative. Supplying extra oxygen in the nasopharynx during apnea might increase DAWD. CONCLUSION Since ventilation and tracheal intubation difficulties are unpredictable, this CPD module recommends that all patients be preoxygenated. The TVB 3 min and the 8 DB 60 sec techniques are suitable for most patients; however, the 4 DB 30 sec is inadequate.
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Affiliation(s)
- Issam Tanoubi
- Département d'anesthésiologie, Hôpital Maisonneuve-Rosemont and Université de Montréal, 5415, boul l'Assomption, Montréal, QC, H1T 2M4, Canada
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Delay JM, Sebbane M, Jung B, Nocca D, Verzilli D, Pouzeratte Y, Kamel ME, Fabre JM, Eledjam JJ, Jaber S. The effectiveness of noninvasive positive pressure ventilation to enhance preoxygenation in morbidly obese patients: a randomized controlled study. Anesth Analg 2008; 107:1707-13. [PMID: 18931236 DOI: 10.1213/ane.0b013e318183909b] [Citation(s) in RCA: 133] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
BACKGROUND Noninvasive positive-pressure ventilation (NPPV) with pressure support-ventilation and positive end-expiratory pressure are effective in providing oxygenation during intubation in hypoxemic patients. We hypothesized administration of oxygen (O2) using NPPV would more rapidly increase the end-tidal O2 concentration (ETO2) than preoxygenation using spontaneous ventilation (SV) in morbidly obese patients. METHODS Twenty-eight morbidly obese patients were enrolled in this prospective randomized study. Administration of O2 for 5 min was performed either with SV group or with NPPV (pressure support = 8 cm H2O, positive end-expiratory pressure = 6 cm H2O) (NPPV group). ETO2 was measured using the anesthesia breathing circuit, and is expressed as a fraction of atmospheric concentration. The primary end-point was the number of patients with an ETo(2) >95% at the end of O2 administration. Secondary end-points included the time to reach the maximal ETO2 and the ETO2 at the conclusion of O2 administration. RESULTS A larger proportion of patients achieved a 95% ETO2 at 5 min with NPPV than SV (13/14 vs 7/14, P = 0.01). The time to reach the maximal ETO2 was significantly less in the NPPV than in the SV group (185 +/- 46 vs 222 +/- 42 s, P = 0.02). The mean ETO2 at the conclusion of O2 administration was larger in the NPPV group than the SV group (96.9 +/- 1.3 vs 94.1 +/- 2.0%, P < 0.001). A modest, although significant, increase in gastric distension was observed in the NPPV group. No adverse effects were observed in either group. CONCLUSION Administration of O2 via a facemask with NPPV in the operating room is safe, feasible, and efficient in morbidly obese patients. In this population NPPV provides a more rapid O2 administration, achieving a higher ETO2.
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Affiliation(s)
- Jean-Marc Delay
- Department of Anesthesia and Critical Care B (DAR B), Hôpital Saint Eloi, 80, avenue Augustin Fliche, 34295 Montpellier Cedex 5, France
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Désaturation artérielle en oxygène et maintien de l’oxygénation pendant l’intubation. ACTA ACUST UNITED AC 2008; 27:15-25. [DOI: 10.1016/j.annfar.2007.10.023] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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Chiron B, Mas C, Ferrandière M, Bonnard C, Fusciardi J, Mercier C, Laffon M. Standard preoxygenation vs two techniques in children. Paediatr Anaesth 2007; 17:963-7. [PMID: 17767632 DOI: 10.1111/j.1460-9592.2007.02259.x] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
BACKGROUND Preoxygenation is recommended in pediatric anesthesia but it has been poorly assessed. Fractional expired oxygen concentration (F(ET)O(2)) is a preoxygenation monitor. The aim of this prospective study in children was to compare three techniques of preoxygenation by the measurement of F(ET)O(2). METHODS Twenty children (6-15 years) were included. F(ET)O(2) was measured with the child in a supine position, holding the face mask. The F(ET)O(2) value was measured after 3 min of calm breathing of room air (baseline) and during the three preoxygenation techniques performed in random order: 3 min of tidal volume breathing using an O(2) flow of 9 l x min(-1) (TV x 3 min)--four deep breaths within 30 s using an O(2) flow of 15 l x min(-1) (4 DB)--eight deep breaths within 1 min using an O(2) flow of 15 l x min(-1) (8 DB). Between each technique, at least 5 min breathing room air was allowed to return to baseline F(ET)O(2). Fisher's exact test was used and P < 0.05 was considered significant. RESULTS Twenty children were studied (age: 11.5 +/- 3 years, weight: 42 +/- 21 kg). The F(ET)O(2) > or = 90% was found to be 79% in 74 +/- 40 s with TV x 3 min, 11% with 4 DB, and 68% with 8 DB. CONCLUSIONS In children, Vt x 3 min is the most efficient preoxygenation technique to reach F(ET)O(2) > or = 90%.
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Affiliation(s)
- Bruno Chiron
- Service d'Anesthésie-Réanimation, Centre Pédiatrique Gatien-de-Clocheville CHRU de Tours, Tours, France.
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