Comparison of McGrath Videolaryngoscope and Macintosh Laryngoscope in Children with Torticollis: Randomized Controlled Trial

We investigated the efficacy of the McGrath videolaryngoscope compared with the Macintosh laryngoscope in children with torticollis. Thirty children aged 1–10 years who underwent surgical release of torticollis were randomly assigned into the McGrath and Macintosh groups. Orotracheal intubation was performed by a skilled anesthesiologist. The primary outcome was the intubation time. The Cormack–Lehane grade, lifting force, intubation difficulty scale (IDS), difficulty level, and intubation failure rate were also assessed. The intubation time was significantly longer in the McGrath group than in the Macintosh group (31.4 ± 6.7 s vs. 26.1 ± 5.4 s, p = 0.025). Additionally, the Cormack–Lehane grades were comparable between the groups (p = 0.101). The lifting force and IDS were significantly lower in the McGrath group than in the Macintosh group (p < 0.001 and p = 0.022, respectively). No significant differences were observed with respect to endotracheal intubation difficulty and intubation success rate. Intubation-related complications were also not observed. In conclusion, compared with the Macintosh laryngoscope, the McGrath videolaryngoscope extended the intubation time and did not improve glottic visualization in children with torticollis, despite having a lesser lifting force, lower intubation difficulty scale, and similar success rate.

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Macintosh laryngoscope, i-view™, and C-MAC® video laryngoscopes for tracheal intubation with an aerosol box: A randomized, crossover, manikin study

10.21203/rs.3.rs-90522/v1 ◽

2020 ◽

Author(s):

Toshiyuki Nakanishi ◽

Yoshiki Sento ◽

Yuji Kamimura ◽

Kazuya Sobue

Keyword(s):

Intensive Care ◽

Tracheal Intubation ◽

Success Rate ◽

Macintosh Laryngoscope ◽

Video Laryngoscope ◽

Interquartile Range ◽

Intubation Time ◽

Lehane Grade ◽

Significant Difference ◽

Difficulty Scale

Abstract Background: The aerosol box was designed to prevent cough droplets from spreading, but it can impede tracheal intubation. We tested the hypothesis that the C-MAC® video laryngoscope (C-MAC) with an external display is more useful than the i-view™ video laryngoscope (i-view) with an integrated display, or a Macintosh direct laryngoscope (Macintosh) for tracheal intubation with an aerosol box.Methods: This prospective, randomized, crossover simulation study was conducted at an operating room of the two hospitals (a university hospital and a tertiary teaching hospital). We recruited 37 medical personnel (36 anesthesiologists and 1 dental anesthesiologist) who were working in the fields of anesthesia and intensive care with > 2 years of dedicated anesthesia experience from five hospitals. We divided the participants into six groups to use the laryngoscope in a determined order. After the training using each laryngoscope without a box, the participants performed tracheal intubation thrice with each laryngoscope with at least two-hour intervals. The primary outcome was the intubation time. The secondary outcomes were the success rate, Cormack-Lehane grade, and subjective difficulty scale score (numeric rating scale 0–10, 0: no difficulty, 10: highest difficulty). We used the Friedman test and the Wilcoxon signed-rank test with Bonferroni adjustment. Data are shown as median [interquartile range].Results: Thirty-seven personnel (11 women and 26 men) with 12 [5–19] (median [interquartile range]) years of anesthesia and intensive care experience were enrolled. There was no significant difference in the intubation time: 30 [26–32] s for Macintosh, 29 [26–32] s for i-view, and 29 [25–31] s for C-MAC (P=0.247). The success rate was 95%–100% without significant difference (P=0.135). The i-view and C-MAC video laryngoscopes exhibited superior Cormack-Lehane grades and lower subjective difficulty scale scores than the Macintosh laryngoscope; however, there were no differences between the i-view and C-MAC video laryngoscopes.Conclusions: Rapid and highly successful tracheal intubation was possible with Macintosh laryngoscope, i-view, and C-MAC video laryngoscopes on a manikin with an aerosol box. Improved Cormack-Lehane grade and ease of procedure may support the use of video laryngoscopes.Trial registration: UMIN Clinical Trials Registry, identifier UMIN000040269.

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Macintosh laryngoscope and i-view™ and C-MAC® video laryngoscopes for tracheal intubation with an aerosol box: a randomized crossover manikin study

JA Clinical Reports ◽

10.1186/s40981-021-00455-7 ◽

2021 ◽

Vol 7 (1) ◽

Author(s):

Toshiyuki Nakanishi ◽

Yoshiki Sento ◽

Yuji Kamimura ◽

Kazuya Sobue

Keyword(s):

Tracheal Intubation ◽

Success Rate ◽

Macintosh Laryngoscope ◽

Video Laryngoscope ◽

Intubation Time ◽

Care Experience ◽

Manikin Study ◽

Lehane Grade ◽

Significant Difference ◽

Difficulty Scale

Abstract Background We tested the hypothesis that the C-MAC® video laryngoscope (C-MAC) with an external display is more useful than the disposable i-view™ video laryngoscope (i-view) with an integrated display or a Macintosh direct laryngoscope (Macintosh) for tracheal intubation with an aerosol box. Methods In this randomized, crossover manikin study, we recruited 37 medical personnel with > 2 years of dedicated anesthesia experience from five hospitals. After the three successful intubations within 60 s using each laryngoscope without a box, the participants performed tracheal intubation thrice with each laryngoscope with at least 2-h intervals in a determined order. The primary outcome was the intubation time. The secondary outcomes were success rate, Cormack-Lehane grade, and subjective difficulty scale score. Results Thirty-seven personnel (11 women and 26 men) with 12 [5–19] (median [interquartile range]) years of anesthesia and intensive care experience were enrolled. There was no significant difference in the intubation time: 30 [26–32] s for Macintosh, 29 [26–32] s for i-view, and 29 [25–31] s for C-MAC (P = 0.247). The success rate was 95–100%, without a significant difference (P = 0.135). The i-view and C-MAC exhibited superior Cormack-Lehane grades and lower subjective difficulty scale scores than the Macintosh; however, there were no differences between the i-view and C-MAC. Conclusions Rapid and highly successful tracheal intubation was possible with both Macintosh, i-view, and C-MAC on a normal airway manikin in an aerosol box. Improved Cormack-Lehane grade and the ease of performing the procedure may support the use of video laryngoscopes. Trial registration UMIN Clinical Trials Registry, UMIN000040269. Registered 30 April 2020.

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Cricoid Pressure Does Not Increase the Rate of Failed Intubation by Direct Laryngoscopy in Adults

Anesthesiology ◽

10.1097/00000542-200502000-00012 ◽

2005 ◽

Vol 102 (2) ◽

pp. 315-319 ◽

Cited By ~ 60

Author(s):

Alexis F. Turgeon ◽

Pierre C. Nicole ◽

Claude A. Trépanier ◽

Sylvie Marcoux ◽

Martin R. Lessard

Keyword(s):

Scale Score ◽

Direct Laryngoscopy ◽

Cricoid Pressure ◽

Anesthesia Induction ◽

Intubation Time ◽

Failed Intubation ◽

Laryngoscopic View ◽

Intubation Difficulty ◽

Lehane Grade ◽

Difficulty Scale

Background Cricoid pressure (CP) is applied during induction of anesthesia to prevent regurgitation of gastric content and pulmonary aspiration. However, it has been suggested that CP makes tracheal intubation more difficult. This double-blind randomized study evaluated the effect of CP on orotracheal intubation by direct laryngoscopy in adults. Methods Seven hundred adult patients undergoing general anesthesia for elective surgery were randomly assigned to have a standardized CP (n = 344) or a sham CP (n = 356) during laryngoscopy and intubation. After anesthesia induction and complete muscle relaxation, a 30-s period was allowed to complete intubation with a Macintosh No. 3 laryngoscope blade. The primary endpoint was the rate of failed intubation at 30 s. The secondary endpoints included the intubation time, the Cormack and Lehane grade of laryngoscopic view, and the Intubation Difficulty Scale score. Results Groups were similar for demographic data and risk factors for difficult intubation. The rates of failed intubation at 30 s were comparable for the two groups: 15 of 344 (4.4%) and 13 of 356 (3.7%) in the CP and sham CP groups, respectively (P = 0.70). The grades of laryngoscopic view and the Intubation Difficulty Scale score were also comparable. Median intubation time was slightly longer in the CP group than in the sham CP group (11.3 and 10.4 s, respectively, P = 0.001). Conclusions CP applied by trained personnel does not increase the rate of failed intubation. Hence CP should not be avoided for fear of increasing the difficulty of intubation when its use is indicated.

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Comparison of Direct and Video Laryngoscopes during Different Airway Scenarios Performed by Experienced Paramedics: A Randomized Cross-Over Manikin Study

BioMed Research International ◽

10.1155/2020/5382739 ◽

2020 ◽

Vol 2020 ◽

pp. 1-8 ◽

Cited By ~ 1

Author(s):

Kurt Ruetzler ◽

Lukasz Szarpak ◽

Jacek Smereka ◽

Marek Dabrowski ◽

Szymon Bialka ◽

...

Keyword(s):

Airway Management ◽

Success Rate ◽

Macintosh Laryngoscope ◽

Cervical Collar ◽

Ease Of Use ◽

Intubation Attempt ◽

Intubation Time ◽

Management Scenarios ◽

Urgent Surgery ◽

Lehane Grade

Introduction. Airway management plays an essential role in anaesthesia practice, during both elective and urgent surgery procedures and emergency medicine. Aim. The aim of the study was to compare Macintosh laryngoscope (MAC), McGrath, and TruView PCD in 5 separate airway management scenarios. Methods. This prospective cross-over simulation study involved 93 paramedics. All paramedics performed intubation using direct laryngoscope (MAC), McGrath, and TruView PCD video laryngoscopes. The study was performed in 5 different scenarios: (A) normal airway, (B) tongue oedema, (C) pharyngeal obstruction, (D) cervical collar stabilization with tongue oedema, and (E) cervical collar stabilization with pharyngeal obstruction. Results. In scenario A, the success rate was 99% with MAC, 100% with McGrath, and 94% with PCD. Intubation time was 17 s (IQR: 16–21) for MAC, 18 s (IQR: 16–21) for McGrath, and 27 s (IQR: 23–34) for PCD. In scenario B, the success rate was 61% with MAC, 97% with McGrath, and 97% with PCD (p<0.001). Intubation time was 44 s (IQR: 24–46) for MAC, 22 s (IQR: 20–27) for McGrath, and 39 s (IQR: 30–57) for PCD. In scenario C, the success rate with MAC was 74%, 97% with McGrath, and 72% with PCD (p<0.001). Intubation time was 21 s (IQR: 19–29) for MAC, 18 s (IQR: 18–24.5) for McGrath, and 30 s (IQR: 23–39) for PCD. In scenario D, the success rate with MAC was 32%, 69% with McGrath, and 58% with PCD (p<0.001). Intubation time was 26 s (IQR: 20–29) for MAC, 26 s (IQR: 20–29) for McGrath, and 45 s (IQR: 33–56) for PCD. In scenario E, the success rate with MAC was 32%, but 64% with McGrath and 62% with PCD (p<0.001). Intubation time was 28 s (IQR: 25–39) for MAC, 19 s (IQR: 18–26) for McGrath, and 34 s (IQR: 27–45) for PCD. Conclusions. The McGrath video laryngoscope proved better than Truview PCD and direct intubation with Macintosh laryngoscope in terms of success rate, duration of first intubation attempt, number of intubation attempts, Cormack-Lehane grade, percentage of glottis opening (POGO score), number of optimization manoeuvres, severity of dental compression, and ease of use.

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A Comparison of the GlideScope® with the Macintosh Laryngoscope for Tracheal Intubation in Patients with Simulated Difficult Airway

Anaesthesia and Intensive Care ◽

10.1177/0310057x0503300215 ◽

2005 ◽

Vol 33 (2) ◽

pp. 243-247 ◽

Cited By ~ 70

Author(s):

Y. Lim ◽

S. W. Yeo

Keyword(s):

Tracheal Intubation ◽

Difficult Airway ◽

Controlled Trial ◽

Macintosh Laryngoscope ◽

Good Alternative ◽

Intubation Time ◽

Laryngeal View ◽

Lehane Grade ◽

Primary Hypothesis ◽

Written Informed Consent

We compared the use of the GlideScope® and the conventional Macintosh laryngoscope in a simulated difficult airway. The primary hypothesis was that time to intubation would be shorter using the GlideScope® than using the Macintosh laryngoscope. After obtaining approval from the ethics committee and written informed consent, we recruited 60 ASA 1 and 2 patients to our randomized controlled trial. Group G (n=30) had tracheal intubation performed using the GlideScope® and Group M (n=30) were intubated using a Macintosh laryngoscope. We simulated a difficult airway in each patient by having an experienced assistant provide in-line manual stabilization of the head and neck. We recorded the best laryngeal view; difficulty of the tracheal intubation; time taken for successful tracheal intubation; manoeuvre needed to aid tracheal intubation and complications associated with the tracheal intubation. The median Cormack and Lehane grade was significantly better in Group G than Group M. Group G had a significantly shorter intubation time than group M (mean 41.8s±SD 20.2 vs mean 56.2s±26.6, P<0.05). The GlideScope® improved the laryngeal view and decreased time for tracheal intubation time when compared with the Macintosh laryngoscope in patients with simulated difficult airway. The GlideScope® may be a good alternative for managing the difficult airway but clinical trials evaluating its use on patients with an actual difficult airway are needed.

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McGrath Video Laryngoscope May Take a Longer Intubation Time Than Macintosh Laryngoscope

Journal of Anesthesiology ◽

10.1155/2015/901903 ◽

2015 ◽

Vol 2015 ◽

pp. 1-4

Author(s):

Prerana N. Shah ◽

Kaveri Das

Keyword(s):

Randomized Study ◽

Macintosh Laryngoscope ◽

Total Duration ◽

Video Laryngoscope ◽

Intubation Time ◽

Laryngoscopic View ◽

Lehane Grade ◽

Secondary Endpoints ◽

Grade Ii ◽

Grade Iii

Background. Video laryngoscopes provide better view and can improve ease of intubation compared with standard laryngoscopes. Methods. A prospective randomized study was done on 60 patients, 18 to 65 years old, comparing McGrath video laryngoscope and Macintosh laryngoscope. The aim was to compare the ease, efficacy, and usability of them during routine airway management. The primary endpoint was duration of intubation and the secondary endpoints were Cormack and Lehane grade of laryngoscopic view, number of intubation attempts, and incidence of complications. Results. There was an increase in total duration of intubation with McGrath video laryngoscope with 42.9 ± 19.5 seconds compared to Macintosh laryngoscope with 17.9 ± 4.6 seconds. In Macintosh group, 73.3% had grade I, 20% had grade II, and 6.7% had grade III Cormack Lehane view, while in McGrath group, 83.3% had grade I, 13.3% had grade II, and 3.3% had grade III. In McGrath group, 6 patients (20%) required more than 120 seconds to get intubated and only 73.3% were intubated in 1 attempt, while patients in Macintosh group had 100% successful intubation in 1 attempt. Pharyngeal trauma was seen with McGrath videolaryngoscopy. Conclusion. Duration of laryngoscopy, intubation, and total duration of intubation were significantly higher in McGrath group than in Macintosh group. McGrath group required a higher number of intubation attempts.

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Should the Glidescope video laryngoscope be used first line for all oral intubations or only in those with a difficult airway? A review of current literature

Journal of Perioperative Practice ◽

10.1177/1750458918788985 ◽

2018 ◽

Vol 28 (12) ◽

pp. 322-333 ◽

Cited By ~ 3

Author(s):

Terrie-Marie Russell ◽

Anil Hormis ◽

Keyword(s):

Difficult Airway ◽

Success Rate ◽

Macintosh Laryngoscope ◽

Review Literature ◽

Video Laryngoscope ◽

Intubation Time ◽

First Line ◽

Glottic View ◽

Glidescope Video Laryngoscope ◽

Difficult Airways

The purpose of this study was to review literature that looked into the efficacy of the Glidescope video laryngoscope versus the Macintosh laryngoscope in oral endotracheal intubations. We aimed to answer the question ‘Should the Glidescope video laryngoscope laryngoscopes be used as first line intubation aids or only in the difficult airway?’ A systematic search of electronic databases was made. The inclusion criteria included: Glidescope, video laryngoscope, and Macintosh laryngoscope in human studies. The study aimed to compare first attempt success rate, glottic view and intubation time in papers dating between 2009 and 2017. Eleven trials with a total of 7,919 patients with both difficult and normal airways were included. The trials showed an improvement in first attempt success rate and glottic view with the Glidescope video laryngoscope especially in those with difficult airways. Overall time to intubate showed no significant differences between the Glidescope video laryngoscope and the Macintosh laryngoscope although it was identified that with increased training and experience with the Glidescope video laryngoscope, intubation time was reduced. Glidescope video laryngoscopes show advantages over the Macintosh laryngoscopes in obtaining better glottic views in those with difficult airways. However its use is not supported in all routine intubations.

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Comparison of i-Gel as a Conduit for Intubation between under Fiberoptic Guidance and Blind Endotracheal Intubation during Cardiopulmonary Resuscitation: A Randomized Simulation Study

Emergency Medicine International ◽

10.1155/2019/8913093 ◽

2019 ◽

Vol 2019 ◽

pp. 1-7

Author(s):

Hyun Young Choi ◽

Wonhee Kim ◽

Yong Soo Jang ◽

Gu Hyun Kang ◽

Jae Guk Kim ◽

...

Keyword(s):

Success Rate ◽

Endotracheal Intubation ◽

Macintosh Laryngoscope ◽

Secondary Outcome ◽

Intubation Time ◽

Chest Compressions ◽

Intubation Technique ◽

Endotracheal Tubes ◽

Significant Difference ◽

Post Hoc

Purpose. This study aimed to compare intubation performances among i-gel blind intubation (IGI), i-gel bronchoscopic intubation (IBRI), and intubation using Macintosh laryngoscope (MCL) applying two kinds of endotracheal tube during chest compressions. We hypothesized that IGI using wire-reinforced silicone (WRS) tube could achieve endotracheal intubation most rapidly and successfully. Methods. In 23 emergency physicians, a prospective randomized crossover manikin study was conducted to examine the three intubation techniques using two kinds of endotracheal tubes. The primary outcome was the intubation time. The secondary outcome was the cumulative success rate for each intubation technique. A significant difference was considered when identifying p<0.05 between two devices or p<0.017 in post hoc analysis of the comparison among three devices. Results. The mean intubation time using IGI was shorter (p<0.017) than that of using IBRI and MCL in both endotracheal tubes (17.6 vs. 29.3 vs. 20.2 in conventional polyvinyl chloride (PVC) tube; 14.6 vs. 27.4 vs. 19.9 in WRS tube; sec). There were no significant (p<0.05) differences between PVC and WRS tubes for each intubation technique. The intubation time to reach 100% cumulative success rate was also shorter in IGI (p<0.017) than that in IBRI and MCL in both PVC and WRS tubes. Conclusions. IGI was an equally successful and faster technique compared with IBRI or MCL regardless of the use of PVC or WRS tube. IGI might be an appropriate technique for emergent intubation by experienced intubators during chest compressions.

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Neutral Position Facilitates Nasotracheal Intubation with a GlideScope Video Laryngoscope: A Randomized Controlled Trial

Journal of Clinical Medicine ◽

10.3390/jcm9030671 ◽

2020 ◽

Vol 9 (3) ◽

pp. 671

Author(s):

RyungA Kang ◽

Ji Seon Jeong ◽

Justin Sangwook Ko ◽

Jaemyung Ahn ◽

Mi Sook Gwak ◽

...

Keyword(s):

Controlled Trial ◽

Nasotracheal Intubation ◽

Head Position ◽

Neutral Position ◽

Dental Surgery ◽

Intubation Difficulty ◽

Difficulty Scale ◽

Nasotracheal Tube ◽

Glidescope Video Laryngoscope ◽

Position Group

The optimal head position for GlideScope facilitated nasotracheal intubation has not yet been determined. We compared the neutral and sniffing positions to establish the degree of intubation difficulty. A total of 88 ASA I-II patients requiring nasotracheal intubation for elective dental surgery with normal airways were divided into two groups according to head position, neutral position (group N), and sniffing position (group S). The primary outcome was the degree of intubation difficulty according to the Intubation Difficulty Scale (IDS): Easy (IDS = 0), mildly difficult (IDS = 1 to 4), and moderately to severely difficult (IDS ≥ 5). Eighty-seven patients completed the study and their data were analyzed. The degree of intubation difficulty was significantly different between the two groups (p = 0.004). The frequency of difficult intubation (IDS > 0) was 12 (27.9%) in group N and 28 (63.6%) in group S (difference in proportion, 35.7%; 95% confidence interval [CI], 14.8 to 52.6%; p = 0.001). The neutral position facilitates nasotracheal intubation with GlideScope by aligning the nasotracheal tube and the glottis inlet more accurately than the sniffing position.

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Comparison of Direct and Indirect Laryngoscopes in Vomitus and Hematemesis Settings: A Randomized Simulation Trial

BioMed Research International ◽

10.1155/2015/806243 ◽

2015 ◽

Vol 2015 ◽

pp. 1-6 ◽

Cited By ~ 15

Author(s):

Ryosuke Mihara ◽

Nobuyasu Komasawa ◽

Sayuri Matsunami ◽

Toshiaki Minami

Keyword(s):

Tracheal Intubation ◽

Success Rate ◽

Macintosh Laryngoscope ◽

Intubation Time ◽

Direct Laryngoscope ◽

Mcgrath Mac ◽

Significant Difference ◽

Intubation Success ◽

Intubation Success Rate

Background.Videolaryngoscopes may not be useful in the presence of hematemesis or vomitus. We compared the utility of the Macintosh laryngoscope (McL), which is a direct laryngoscope, with that of the Pentax-AWS Airwayscope (AWS) and McGRATH MAC (McGRATH), which are videolaryngoscopes, in simulated hematemesis and vomitus settings.Methods.Seventeen anesthesiologists with more than 1 year of experience performed tracheal intubation on an adult manikin using McL, AWS, and McGRATH under normal, hematemesis, and vomitus simulations.Results.In the normal setting, the intubation success rate was 100% for all three laryngoscopes. In the hematemesis settings, the intubation success rate differed significantly among the three laryngoscopes (P=0.021). In the vomitus settings, all participants succeeded in tracheal intubation with McL or McGRATH, while five failed in the AWS trial with significant difference (P=0.003). The intubation time did not significantly differ in normal settings, while it was significantly longer in the AWS trial compared to McL or McGRATH trial in the hematemesis or vomitus settings (P<0.001, compared to McL or McGRATH in both settings).Conclusion.The performance of McGRATH and McL can be superior to that of AWS for tracheal intubation in vomitus and hematemesis settings in adults.

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