View clinical trials related to Laryngeal Masks.
Filter by:The supraglottic airway device (SAD) is currently widely used in patients undergoing general anaesthesia as a method of securing the airway. The usage of SAD does not require the patient to be paralysed prior to insertion, as opposed to an endotracheal tube. Five tests have been recommend to ensure that the SAD can be used for advanced procedure after a blind insertion. These tests however are not confirmed with visual validation and hence the confirmation of optimal position can be misleading. This study is conducted to validate by video laryngoscopy the five recommended tests for confirming the placement and efficacy of a SAD, thus enabling its safe application in institutions with limited availability of video laryngoscopes. Subjects for this study will consist of patients scheduled for procedures under general anaesthesia in the University of Malaya Medical Centre (UMMC) who are amenable to supraglottic airway management.
The choice of the size of the laryngeal mask (i-gel) is based on the weight. Even following the weight recommendations, it is quite common to choose a mask that is too big or too small, which leads to ventilation leaks (too small), or insertion failures (too big) and leads to a change of mask for bigger or smaller. The i-gel are laryngeal masks (2nd generation) which consist of gel and have been designed by molding on larynx corpses. The masks are not inflatable (so not adaptable). I-gel masks are used in adult and pediatric patients for weights ranging from 2 Kg to over 90 Kg to provide ventilation during general anesthesia. Patients with a deep voice probably need a larger laryngeal mask than their weight alone suggests. The investigators propose to measure the lowest sound emitted by the patient because it would seem logical that the larger the larynx is, the more the voice is serious. This hypothesis will be verified a posteriori by the size of the laryngeal mask used and adapted by comparing it to the range of the voice.
The supraglottic airway device(SAD), as an alternative to the endotracheal tube is inserted into the oral cavity and seals the upper esophagus and the surrounding tissue, effectively securing airway. SAD has evolved in recent years to increase efficiency and secure safety. The recently developed Ambu® AuraGain™ is a second-generation SAD with a built-in gastric port and is designed to be fitted well in the larynx and oral cavity after insertion because the shaft is bent at an angle of 90 degrees and has an inflatable cuff. In a previous study, Ambu® AuraGain™ showed a higher sealing pressure and better fibreoptic finding compared to LMA Supreme in laparoscopic surgery. On the other hand, I-gel and Ambu® AuraGain™, both of the second-generation SAD, show comparatively excellent performance according to the results of previous studies. However, there are no studies comparing the characteristics of two airway devices in adults. The purpose of this study is to compare the performance of I-gel and Ambu® AuraGain™ to make a difficult airway-like situation using cervical collar for adult patients receiving mechanical ventilation under general anesthesia.
Currently, the main method for selecting an i-gel® size is based on the body weight recommendation (30-60 kg for size 3 and 50-90 kg for size 4) according to the manufacturer's recommendation. However, there is an overlapping in size selection in people weighing between 50 and 60 kilograms. Laryngeal mask airways are widely used for breast surgery, and this patient cohort is often weighed between 50-60 kilograms in National Taiwan University Hospital. Therefore, in this randomized clinical trial, the investigators will compare the ventilation efficacy of size 3 and size 4 i-gel® in anesthetized, paralyzed female patients weighing 50 to 60 kilograms who undergo breast surgery. Also, the investigators will record any side effects of size 3 and size 4 i-gel® in this cohort.
It is known that patients with head and neck cancer who have had radiation therapy to the structures of the neck are at a greater risk of difficult mask ventilation and tracheal intubation than the majority of patients undergoing general anaesthesia. Failure to maintain oxygenation can lead to catastrophic consequences for any patient undergoing general anaesthesia, such as severe hypoxic brain injury and death. As such, the current guidelines from the Difficult Airway Society promote the use of a second generation laryngeal mask airway to maintain oxygenation in the event of failed mask ventilation or tracheal intubation, a rescue technique that has in most patient groups a very high chance of success. Unfortunately these guidelines are by necessity generic guidance and do not take into account the clinical performance of these devices in specific patient groups. While there is evidence of the effectiveness of the IGEL device as the primary method of airway maintenance in many studies there are none that describe its clinical performance in a group of patients in whom the rate of failed mask ventilation and tracheal intubation are significantly higher than the general population of patients. It is therefore of great interest to have an idea of the likelihood of success of rescue ventilation with this device in a group of high risk patients.
LMA Protector is a recently developed second generation laryngeal mask several kinds of different laryngeal masks were used for the airway management during laparoscopic surgeries. However there is a lack of knowledge for the use of LMA Protector during laparoscopic surgery .In this study researchers aim to determine the effectivity of LMA Protector and plan to analyse the orofaryngeal cuff pressure and fiberoptic grading scale measurements .
The investigators aim to compare the airway seal pressure( oropharyngeal leak pressure) of the Self Pressurized Airway Device with Blocker® with the ProsealTM Laryngeal Mask Airway (P-LMA)in anesthetized paralyzed adult female patients undergoing elective gynecological operations. The investigators aim at assessment of fitting of both devices against the glottic region that detected by the flexible fiberoptic bronchoscope( Pentex Corporation, Medical Division, Singapore)and assessment of any associated postoperative complications. Hypothesis: The investigators hypothesize that the self-pressurized air-Q with blocker has a greater seal pressure compared to Proseal, easier and faster in insertion with less morbidity and complications during and after its insertion.
The investigators aimed to explore the effects of airway peak pressure (Ppeak) guidance on the least laryngeal mask airway (LMA) intracuff pressure setting during general anesthesia and the effects on postoperative complications in the throat. One hundred and twenty patients (American Society of Anesthesiologists grades I or II) scheduled for elective laparoscopic cholecystectomy under general anesthesia were enrolled in our study. The patients were divided into pressure-regulated group (group P) and control group (group C) randomly. Supreme LMA was inserted in after general anesthesia induction. Air was injected into the cuff to make the intracuff pressure (ICP) achieve 60 cmH2O. Volume-controlled ventilation was selected and Ppeak was recorded. In group P, all the gas in the LMA cuff was sucked out, and then air was injected in during expiration phase to make ICP achieve the level of Ppeak. If there's any leakage, increase 5 cmH2O every time till there's no air leakage from the mouth. After pneumoperitoneum, the cuff was inflated to make ICP achieve 60 cmH2O and Ppeak was recorded once more. Then all the gas in the LMA cuff was sucked out, and air was injected into the cuff during expiration phase to make ICP achieve the level of Ppeak as the above method till the end of operation. During pneumoperitoneum, the pressure of CO2 was set at 10 cmH2O. In group C, ICP was maintained at 60 cmH2O. Ppeak, ICP and the intracuff gas volume were recorded before and after pneumoperitoneum. ICP during inspiratory phase in the two groups was measured. Tidal volume during inspiration (VTI) and expiration (VTE) in the two groups were recorded, and the leakage rate was calculated as [(VTI－VTE)/ VTI×100%]. Throat complications of all the patients in 24 hours after surgeries were also recorded.
This interventional double-blind, randomized trial has included120 children of American Society of Anesthesiologist (ASA) physical status I or II aged between 1and 8 years of either sex, scheduled for outpatient minor surgery under general anesthesia.This study examined whether co-induction with ketamine-propofol enhance laryngeal mask airway (LMA) insertion conditions and preserve hemodynamic state in patients.
The air-Q and air-Q SP are commercially-available supraglottic airways (SGAs) that can be used for primary airway maintenance or as a conduit for FOI, as can be the Williams, Ovassapian, and Berman Intubating Airways. The air-Q products have the same overall geometrical design, but differ in their cuff inflating mechanisms, where the air-Q uses a traditional pilot balloon valve, while the air-Q SP utilizes a self-inflating cuff that dynamically adjusts according to the relative resistances to airflow between the patient's lungs and the device's cuff. The purpose of this study is to compare the single-operator intubation success using the air-Q SP versus the Williams Intubating Airway as a conduit for flexible bronchoscopic intubation (FBI) and to compare the single-operator intubation success using the air-Q SP versus the Williams Intubating Airway as a conduit for flexible bronchoscopic intubation. Both devices are commercially-available and being used in the study in accordance with their labeled intended use. The investigator envisage that the endpoint of the study will be single operator intubation success rate.