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The Efficacy of Laryngeal Mask Airway Gastro (LMA® Gastro™) in Preventing Hypercarbia in ERCP Patients

Not Applicable
Completed
Conditions
Endoscopy, Gastrointestinal
Procedural Sedation
Anesthesia Airway Management
Anesthesia for Endoscopic Procedures
Registration Number
NCT07182786
Lead Sponsor
Cairo University
Brief Summary

Endoscopic retrograde cholangiopancreatography (ERCP) has evolved into a primarily therapeutic procedure that often requires anesthetic support. While moderate to deep sedation is commonly used, it carries a high risk of respiratory complications, including hypoxemia and hypercapnia, which can lead to cardiovascular instability. General anesthesia with endotracheal intubation offers greater airway protection but is associated with hemodynamic stress, the need for neuromuscular blockade, longer recovery, and potential airway trauma.

The LMA® Gastro™ Airway, introduced in 2017, was specifically designed for upper gastrointestinal endoscopy. It combines a supraglottic airway with a dedicated channel for the endoscope, enabling ventilation and airway protection while facilitating the procedure. Early studies demonstrate high success rates for both airway management and ERCP completion, with a low incidence of adverse events. However, most available evidence is observational, and randomized controlled trials are needed to establish its effectiveness compared with traditional sedation and general anesthesia with intubation.

In conclusion, the LMA Gastro shows promise as a safe and efficient alternative airway device for ERCP, potentially bridging the gap between deep sedation and invasive intubation, though further evidence is required to confirm its impact on respiratory and hemodynamic outcomes.

Detailed Description

Endoscopic retrograde cholangiopancreatography (ERCP) is fast emerging as a therapeutic procedure rather than a diagnostic one, requiring anesthetic support for successful completion of the procedure. The procedure can be uncomfortable especially due to prone positioning, multiple passages of endoscope, air insufflations, dilatation of ductal structures and prolonged duration which requires a high degree of cooperation from patients. A large number of patients need to be given general anesthesia (GA), in order to minimize incidence of adverse respiratory and hemodynamic events in the peri-procedure period. The use of GA with endotracheal intubation (ETT) or supraglottic devices protects the airway, reduces ERCP failure and complication rates. However, ETT involves rigid laryngoscopy with consequent undesirable hemodynamic responses and use of neuromuscular blocking drugs. It also has the disadvantage of a longer recovery time and possibility of injury to the oro-pharynx at insertion.

Moderate to deep sedation is a commonly employed technique for ERCPs, with general anesthesia utilizing an endotracheal intubation being reserved for selected cases. Reported rates of hypoxemia during all endoscopic procedures range from 11 to 50%, and this may be as high as 60% with ERCP. Sustained hypoxia is a major risk factor for peri-procedural cardiac arrhythmias and myocardial ischemia. Respiratory complications that occur during intravenous sedation have a higher risk of hypercapnia than hypoxemia. Patients receiving propofol-based tubeless sedation may be at higher risk of sedation-related adverse events than patients receiving GA. Moreover, when low-flow oxygen is administered through a nasal cannula, the apparent oxygen saturation value is maintained at a normal concentration; however, hypoventilation is sustained, which may result in impaired exhalation. Gradual CO₂ accumulation, and CO₂ concentrations maintained at 60 mmHg or higher, are risk factors for secondary circulatory abnormalities such as an abnormal increase in blood pressure, tachycardia, and arrhythmia.

As the number of gastrointestinal endoscopic interventions and possibilities increased, and the number of patients with severe comorbidities and existing medical conditions, the need for minimally invasive airway devices specially dedicated for endoscopic procedures became relevant. A modified laryngeal tube with a dedicated channel for an endoscope was described as an alternative airway device. This approach was further developed with the introduction of the LMA® Gastro™ Airway, a refined tool in advanced airway management for upper gastrointestinal endoscopy.

The LMA® Gastro™ Airway is a cuffed peri-laryngeal supraglottic airway (SGA) with an endoscopic channel, having a maximum diameter of 14 mm, which suits all standard endoscopes. Its design features include a channel for esophageal intubation, a separate channel with a terminal cuff for lung ventilation, and an integrated bite block and cuff pressure indicator. It comes in three available sizes: #3 (30-50 kg), #4 (50-70 kg), and #5 (70-100 kg).

This device has been reported to have a high airway insertion success rate and a high first-attempt endoscopy success rate in patients with low risk of pulmonary aspiration. Observational studies have suggested that the LMA Gastro may be a safe alternative to tubeless anesthesia in patients undergoing ERCP, though some were limited by small sample size and non-randomized design. Retrospective analyses have demonstrated high success rates of ERCP completion with well-maintained ventilation and minimal intraoperative and postoperative adverse events. However, confounding factors in patient selection and the absence of randomized controlled comparisons with conventional airway techniques remain limitations.

Although the LMA Gastro has been demonstrated in several studies as a safe and efficient substitute for general anesthesia or deep sedation tubeless anesthesia for ERCP procedures, to date there is no exact measurement or assessment of its role in prevention of hypercarbia or hypoxia.

Aim of the work:

The aim of this study is to evaluate the efficacy of using LMA Gastro in preventing hypercarbia and decreasing hypoxic and hyper carbic episodes in patients undergoing ERCP procedures of average timing and difficulty according to the ASGE (American Society of Gastroenterologists) grading system. In addition, to assess the efficiency of using the new LMA Gastro® airway device in endoscopic procedures and its stress response.

Recruitment & Eligibility

Status
COMPLETED
Sex
All
Target Recruitment
50
Inclusion Criteria
  • Adult patients age: 20-45 years
  • ASA classification: II and III
  • Body mass index: 25 -30 kg/m2
  • Height > 155 cm
  • ERCP procedures of difficulty grade II and III (according to American Society of Gastroenterologists ASGE grading system for ERCP procedures).
Exclusion Criteria
  • Anticipated difficult airway
  • Restricted head and neck mobility
  • Pulmonary disease
  • Obese Patients with a BMI of ≥ 35 kg/m2
  • Patients with moderate to severe ascites
  • Patients with Childe-Pughe-Turcotte (CPT) classification C
  • Increased risk of aspiration (for example incomplete fasting hours, delayed gastric emptying, gastric outlet obstruction, etc.)
  • ERCP procedures of difficulty grade I (due to relatively short procedure duration)
  • ERCP procedures of malignant obstructive jaundice
  • ERCP procedures less than 30 minutes and more than 120 minutes.
  • Patient refusal

Study & Design

Study Type
INTERVENTIONAL
Study Design
PARALLEL
Primary Outcome Measures
NameTimeMethod
End tidal CO230 minutes from induction of Anesthesia

End tidal CO2 measurement after 30 minutes of procedure time. It is measured by capnography in patients undergoing ERCP procedure.

Secondary Outcome Measures
NameTimeMethod
HypercarbiaProcedures of duration between 30 and 120 minutes

ETCO2 (≥45 mmHg) or PaCO2(≥50 mmHg) or both Highest ETCO2 and PaCO2 recorded during procedure

Timing of HypercarbiaProcedures of duration between 30 and 120 minutes

Time till ETCO2 (≥45 mmHg) or PaCO2(≥50 mmHg) or both

HypoxiaProcedures of duration between 30 and 120 minutes.

Lowest SpO2 and PaO2 recorded during procedure

Number of Hypoxic episodesProcedures of duration between 30 and 120 minutes

Number of hypoxic episodes (desaturation to SPO2 of 92% or below for at least 15 seconds)

Hemodynamic stress response : Heart RateProcedures of duration between 30 and 120 minutes.

Heart rate

Hemodynamic stress response : Mean arterial blood pressureProcedures of duration between 30 and 120 minutes.

Mean arterial blood pressure

Efficiency of LMA gastro in anesthesia of ERCP procedures: duration till endoscope introduction.From Anesthesia induction till start of procedure

Measuring time taken from induction of anesthesia till ERCP duodenoscope introduction( start of ERCP procedure).

Efficiency of LMA gastro in anesthesia of ERCP procedures: Ease of duodenoscope introduction.From induction of Anesthesia till start of procedure

Number of attempts of ERCP duodenoscope introduction

Efficiency of LMA gastro in anesthesia of ERCP procedures: ease of LMA Gastro insertion.From induction of Anesthesia till start of procedure

Number of attempts of LMA Gastro insertion

Efficiency of LMA gastro in anesthesia of ERCP procedures: Safety of LMA GastroDuring whole ERCP procedure

Number of displacements of LMA Gastro and need for repositioning

Efficiency of LMA gastro in anesthesia of ERCP procedures: Anesthetic consumption of propofolwhole duration of ERCP procedure

* Mean dose of propofol used in induction in both groups

* Mean dose of propofol used for maintenance of anesthesia

Efficiency of LMA gastro in anesthesia of ERCP procedures: Recovery timefrom the end of ERCP procedure till discharge to PACU

Recovery time (from stopping propofol infusion till discharge to PACU)

Efficiency of LMA gastro in anesthesia of ERCP procedures: procedure failureprocedures between 30 and 120 minutes

Number of failed procedures in both groups

Efficiency of LMA gastro in anesthesia of ERCP procedures: procedure durationprocedures between 30 and 120 minutes

Effect of using LMA Gastro on average procedure duration in comparison to control group

Efficiency of LMA gastro in anesthesia of ERCP procedures: post operative complicationsFrom end of procedure till discharge from PACU (after 30 min.)

occurrence of post operative Nausea, vomiting or sore throat

Efficiency of LMA gastro in anesthesia of ERCP procedures: operator satisfactionprocedures between 30 and 120 minutes

The operator rates the following on a scale from 1to 5 ( 1 being worst and 5 the best):

* ease of endoscope introduction

* ease of manipulation and advancement

* overall satisfaction

Efficiency of LMA gastro in anesthesia of ERCP procedures: anesthesiologist satisfactionprocedures between 30 and 120 minutes

The anesthesiologist rates the following on a scale from 1 to 5 ( 1 being the worst and 5 the best):

* ease of LMA Gastro insertion

* overall satisfaction

Efficiency of LMA gastro in anesthesia of ERCP procedures: conversion to endotracheal intubation.procedures between 30 and 120 minutes

number of procedures that were converted to traditional endotracheal intubation due to vomiting, risk of aspiration with excessive secretions in oral cavity, severe laryngeal spasm not responding to increasing depth of anesthesia or I.V. lidocaine, airway obstruction and persistent hypoxia.

Trial Locations

Locations (1)

Theodor Bilharz Research Institute

🇪🇬

Giza, Egypt

Theodor Bilharz Research Institute
🇪🇬Giza, Egypt

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