Additional inspiratory resistance imposed by the laryngeal mask airway: <i>in vitro</i> versus <i>in vivo</i> comparison

Righini, E; Marangoni, Elisabetta; Volta, Carlo Alberto; Alvisi, R; Bortolazzi, S.; Gritti, G

doi:10.1111/j.1365-2044.1997.184-az0321.x

Cited by 12 publications

(3 citation statements)

References 23 publications

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“…The internal diameter of the syringe was 2 cm, which is approximately the size of an adult human trachea [ 9 , 10 ]. In the LMA group, a 35-mm- diameter plastic cylinder with a length of 120 mm was connected to the size 3 LMA to roughly simulate the insertion of LMA into the upper airway [ 11 ]. The balloon pressure was measured using VBM Balloon Pressure Gauge Handheld Pressure Pump Tracheal Intubation Pressure Gauge ( German, Hxh-11 Hxh Ce ).…”

Section: Methodsmentioning

confidence: 99%

Efficacy of using an intravenous catheter to repair damaged expansion lines of endotracheal tubes and laryngeal masks

Wang

et al. 2022

BMC Anesthesiol

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Background In perioperative care or intensive care units, the expansion lines of endotracheal tubes (ETTs) or laryngeal mask airways (LMAs) may be accidentally cut off during medical procedures. We designed a simple method for repairing damaged ETT and LMA expansion lines. Methods In this in vitro study, ETT (n = 20) or LMA (n = 20) models were each categorized into experimental (n = 10) and control (n = 10) groups. In the experimental groups, the expansion lines were cut in the middle, and a 22G intravenous catheter was inserted into the broken end of each expansion line. The time taken to repair the expansion lines was recorded in both experimental groups. The repaired expansion lines in both groups were tested for visible underwater air leakage with cuffs under high pressure (120 cm H2O). After 15 h, the cuff pressure and tensile strength of the expansion lines were measured. Results The overall time required to repair the expansion line was 27.8 ± 1.5 s in the ETT group and 20.4 ± 1.1 s in the LMA group. When the cuff pressure was increased to 120 cmH2O, no air leakage was observed in the experimental LMA and ETT groups. The mean difference in the cuff pressures of the control and experimental groups was insignificant for both, ETT (9.50 ± 1.29 vs. 9.50 ± 1.08 cmH2O, 95% CI = − 1.11 to 1.11 cmH2O, P = 1.00) and LMA (34.1 ± 1.10 cmH2O vs. 34.5 ± 0.97 cmH2O, 95% CI = − 0.57 to 1.37 cmH2O, P = 0.40) groups, The tensile strength and the force required to pull apart the expansion lines in the experimental groups were lower than those in the control groups for ETTs (3.32 ± 0.37 N vs. 35.03 ± 4.47 N, 95% CI = − 34.69 to − 28.72 N, P < 0.0001) and LMAs (36.55 ± 2.20 N vs. 26.18 ± 1.67 N, 95% CI = − 12.21 to − 8.53 N, P < 0.0001). Conclusion An intravenous catheter can be directly inserted into the damaged ETT or LMA expansion lines; it is a simple, rapid, and effective repair method.

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Section: Methodsmentioning

confidence: 99%

Efficacy of using an intravenous catheter to repair damaged expansion lines of endotracheal tubes and laryngeal masks

Wang

et al. 2022

BMC Anesthesiol

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“…Katz, et al (1985) first simulated spontaneous breathing with a mechanical device while measuring continuous positive airway pressure using a two-chambered lung model. Righini, et al (1997) used a one-lung model when measuring the additional inspiratory resistance imposed by the Laryngeal Mask Airway. Austin, et al (2000) used a two-chambered test lung to measure work of breathing characteristics of portable ventilators.…”

Section: Introductionmentioning

confidence: 99%

Imposed Work of Breathing of Airway Adjuncts

Skinner¹,

Gilmer²,

Molloy³

et al. 2004

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“…후두마스크는 기관 내튜브에 비하여 여러 가지 장점을 갖는다 13). 후두마스크는 장치 자체의 기도저항이 기관내튜브에 비해 작다 14,18). 낮은 기도저항은 기관내튜브에 비해 호흡일(work of breathing)을 감소시키고19) 동적 유순도(dynamic compliance)를 높인다.참 고 문 헌…”

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The Effect of Increased F_IO₂before Removal of the Laryngeal Mask Airway on Postanesthetic Arterial Partial Oxygen Pressure

Lim

Seo

Jung

et al. 2005

Korean J Anesthesiol

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Background:The administration of 100% oxygen at the end of general anesthesia before tracheal extubation has been shown to worsen postanesthetic pulmonary gas exchange. Because the laryngeal mask airway (LMA) and the endotracheal tube (ETT) are very different, it remains uncertain whether emergence on oxygen has the same results on lung function as ETT. Therefore, the aim of this study was to evaluate whether the use of 100% oxygen before LMA removal worsens gas exchange after inhalation or total intravenous general anesthesia.Methods: Eighty ASA physical status I-II patients scheduled for elective surgery of the extremities were randomly assigned to receive either sevoflurane or propofol during general anesthesia with LMA. At the end of surgery, patients were randomized to an inspiratory fraction of oxygen of 0.3 in sevoflurane (n = 20), of 0.3 propofol (n = 20) or of 1.0 in sevoflurane (n = 20) or of 1.0 in propofol (n = 20) during emergence from anesthesia and LMA removal. Postoperative blood gas measurements were taken immediately and 60 min after arrival in the recovery room.Results: No significant differences in PaO2 (propofol groups: 87.5 ± 14.4 vs 88.5 ± 10.5 mmHg, sevoflurane groups: 86.7 ± 11.3 vs 90.7 ± 9.9 mmHg) or alveolar -arterial oxygen tension difference (AaDO2) were found between the two groups at 30 min after LMA removal (propofol groups: 12.0 ± 12.4 vs 10.3 ± 8.3 mmHg, sevoflurane groups: 8.6 ± 7.1 vs 7.1 ± 9.4 mmHg). No differences were observed between the sevoflurane and propofol groups when FIO2 levels were similar.Conclusions: Breathing 100% oxygen during emergence from general anesthesia does not worsen postanesthetic pulmonary gas exchange when an LMA is used.

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Additional inspiratory resistance imposed by the laryngeal mask airway: in vitro versus in vivo comparison

Cited by 12 publications

References 23 publications

Efficacy of using an intravenous catheter to repair damaged expansion lines of endotracheal tubes and laryngeal masks

Efficacy of using an intravenous catheter to repair damaged expansion lines of endotracheal tubes and laryngeal masks

Imposed Work of Breathing of Airway Adjuncts

The Effect of Increased F_IO₂before Removal of the Laryngeal Mask Airway on Postanesthetic Arterial Partial Oxygen Pressure

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Additional inspiratory resistance imposed by the laryngeal mask airway: in vitro versus in vivo comparison

Cited by 12 publications

References 23 publications

Efficacy of using an intravenous catheter to repair damaged expansion lines of endotracheal tubes and laryngeal masks

Efficacy of using an intravenous catheter to repair damaged expansion lines of endotracheal tubes and laryngeal masks

Imposed Work of Breathing of Airway Adjuncts

The Effect of Increased FIO2before Removal of the Laryngeal Mask Airway on Postanesthetic Arterial Partial Oxygen Pressure

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The Effect of Increased F_IO₂before Removal of the Laryngeal Mask Airway on Postanesthetic Arterial Partial Oxygen Pressure