Influence of temperature on volume, weight and density changes of i-gel masks

Martin, Christoph; Piekarski, Florian; Mutlak, Haitham; Schalk, Richard; Dubinski, Daniel; Zacharowski, Kai; Raimann, Florian J.

doi:10.5114/ait.2020.93416

Cited by 3 publications

(3 citation statements)

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“…Martin et al revealed that all I-gel laryngeal masks have a significant temperature-dependent increase in volume and weight as well as a significant decrease in density. [40] These results may represent a new approach to explain how the prewarmed non-inflatable cuff laryngeal mask improves its sealing pressure over time after insertion. We found that a prewarming non-inflatable laryngeal mask could enable the cuff to fit the pharyngeal structure more quickly and improve the intubation success rate, which was confirmed by TSA.…”

Section: Discussionmentioning

confidence: 86%

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Prewarming non-inflatable cuff laryngeal mask for mechanical ventilation: A systematic review and meta-analysis with trial sequential analysis

Wang

Zhang

et al. 2022

Medicine

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Background: Non-inflatable cuff laryngeal masks are generally composed of thermoplastic material. The thermoplastic nature of the non-inflatable cuff will become soft and match the laryngeal anatomy better as it reaches body temperature after intubation. This meta-analysis aims to evaluate the clinical validity of prewarming non-inflatable cuff laryngeal mask before insertion. Methods: We searched PubMed, Cochrane Library, Embase, Web of Science, Ovid Medline, CNKI, Wan Fang Database and VIP Database to find randomized controlled trials (RCTs) researching the clinical validity of prewarming non-inflatable cuff laryngeal mask. The retrieval time is up to June 2022. Articles published in the English and Chinese languages were considered. Quality assessment was conducted with the Cochrane Collaboration’s tool and GRADE (Grading of Recommendations Assessment, Development and Evaluation) method. Subgroup analyses and trial sequential analysis (TSA) were performed to control the risk of random errors. Publication bias was assessed by funnel plots and Egger’s regression test. The outcomes included sealing pressure immediately after successful ventilation, the first-attempt intubation success rate and the incidence of postoperative pharyngeal pain. Results: Eight RCTs evaluating 683 patients were identified. Pooled results showed that compared to the control group, prewarming non-inflatable cuff laryngeal mask provided a higher sealing pressure immediately after successful ventilation (mean difference: 1.73 cm H2O; 95% confidence interval [CI]: 0.95-2.52; P < .0001; I2 = 16; high quality), higher first-attempt intubation success rate (risk ratio [RR]: 1.05; 95% CI: 1.01-1.09; P = .01; I2 = 26%; high quality, number needed to treat [NNT] = 22 [95% CI 12.5-100]) and lower incidence of postoperative pharyngeal pain (RR: 0.59, 95% CI: 0.46-0.75; P < .0001; I2 = 0; high quality, NNT = 6 [95% CI 4.17-9.09]). The results were confirmed by TSA. Conclusion: Prewarming non-inflatable cuff laryngeal mask could provide better mechanical ventilation efficiency with higher sealing pressure, a higher first-attempt intubation success rate and a lower incidence of postoperative pharyngeal pain. Trial registration number: PROSPERO CRD42021245350

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Section: Discussionmentioning

confidence: 86%

Section: Discussionmentioning

confidence: 99%

Prewarming non-inflatable cuff laryngeal mask for mechanical ventilation: A systematic review and meta-analysis with trial sequential analysis

Wang

Zhang

et al. 2022

Medicine

View full text Add to dashboard Cite

show abstract

“…Our meta-analysis found the sealing pressure of the prewarmed i-gel laryngeal mask was significantly higher than the control group. Martin et al 36 revealed that all i-gel mask has a significant temperature-dependent increase in volume and weight as well as a significant decrease in density. These results represent a new approach to explain how the prewarmed i-gel laryngeal mask improves its sealing pressure over time after insertion.…”

Section: Discussionmentioning

confidence: 99%

Prewarming i-gel laryngeal mask for mechanical ventilation: a meta-analysis of randomised control trials and trial sequential analysis

Zheng

Jia

et al. 2021

BMJ Open

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ObjectiveTo systematically evaluate the efficiency of prewarming i-gel laryngeal mask for mechanical ventilation by meta-analysis and trial sequential analysis.DesignSystematic review and meta-analysis.Data sourcesCochrane library, Web of Science, Ovid Medline and PubMed were searched from their inception to 31 August 2020. Only articles published in English language were considered.MethodsRandomised controlled trials (RCTs) comparing the efficiency of prewarming i-gel laryngeal mask versus keeping it at room temperature for mechanical ventilation were included. Primary outcome was sealing pressure immediately after successful ventilation. Secondary outcomes were the first-attempt insertion success rate and the incidence of postoperative pharyngeal pain. Two authors independently selected studies. Quality analysis was performed using the modified Jadad Scale. Trial sequential analysis (TSA) was used to control risk of random errors. Sensitivity analysis was done to assess the effect of a single study on the pooled estimates. Publication bias was assessed by funnel plots and Egger’s regression test.ResultsFour RCTs comprising 374 patients were included. The results of meta-analysis showed that compared with the control group, prewarming i-gel laryngeal mask provides a higher sealing pressure immediately after successful ventilation (mean difference 2.19 cm H2O; 95% CI (1.17 to 3.21); p<0.0001; high quality), with firm evidence from TSA and lower publication bias (p=0.7372). No significant difference was observed in the first-attempt insertion success rate (relative ratio (RR) 1.06; 95% CI (1.00 to 1.12); p=0.07; high quality) with lower publication bias (p=0.1378). The TSA indicating further trials are required. No significant difference was assessed in the incidence of postoperative pharyngeal pain (RR 1.0; 95% CI (0.14 to 6.90); p=1.0; high quality).ConclusionPrewarming i-gel laryngeal mask provides higher sealing pressure compared with keeping it at room temperature. But prewarming i-gel laryngeal mask did not increase the first-attempt insertion success rate, nor did it decrease the incidence of postoperative pharyngeal pain.

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Supraglottic airway devices for elective pediatric anesthesia: I-gel versus Air-Q, which is the best?

2020

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Influence of temperature on volume, weight and density changes of i-gel masks

Cited by 3 publications

References 13 publications

Prewarming non-inflatable cuff laryngeal mask for mechanical ventilation: A systematic review and meta-analysis with trial sequential analysis

Prewarming non-inflatable cuff laryngeal mask for mechanical ventilation: A systematic review and meta-analysis with trial sequential analysis

Prewarming i-gel laryngeal mask for mechanical ventilation: a meta-analysis of randomised control trials and trial sequential analysis

Supraglottic airway devices for elective pediatric anesthesia: I-gel versus Air-Q, which is the best?

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