Endoscopic retrograde cholangiopancreatography (ERCP) is an imaging procedure that visualizes the drainage ducts of the pancreas, gallbladder, and liver through the use of a duodenoscope and contrast media. By endoscopically identifying the ampulla of Vater, the common bile duct is cannulated. ERCP is also frequently utilized for therapeutic interventions, such as endoscopic sphincterotomy, bile duct stone extraction, stent placement in malignant and benign biliary strictures, and biopsy collection, thus playing a critical role in both the diagnosis and treatment of pancreatobiliary disorders. ERCP, being more invasive than routine upper endoscopies or colonoscopies, typically necessitates deeper levels of sedation. The procedure is performed in the prone, modified prone, or lateral decubitus position, which increases the risk of hypoxemia and hypoventilation due to upper airway obstruction. Furthermore, endoscopic instruments inserted through the oral cavity limit anesthesiologists' access to the patient's airway, thereby restricting ventilation support during gastrointestinal endoscopy. Ensuring airway stability during sedation is paramount for patient safety and procedural efficacy. Currently, a range of devices, including traditional nasal cannulas, high-flow oxygen masks, and procedural oxygen masks, are routinely employed to provide oxygen support throughout the procedure. The existing literature includes randomized controlled trials and systematic reviews aimed at preventing hypoxemia during ERCP. Through this study, investigators aim to make a novel contribution to the literature by assessing the effectiveness of a recently introduced procedural oxygen mask.
This study aims to compare the efficacy of different oxygen delivery methods (Nasal Cannula \[NC\] and Procedural Oxygen Mask \[POM\]) in preventing the incidence of hypoxemia during Endoscopic Retrograde Cholangiopancreatography (ERCP). Designed as a randomized controlled prospective study, participants were assigned into two groups, Group N (NC) and Group P (POM), at a 1:1 ratio through randomization. The randomization was performed using computer-assisted random allocation; however, due to the visual differences in the oxygen delivery devices, neither healthcare providers nor patients could be blinded to the randomization results. A power analysis conducted to establish a statistical power of 80% and an alpha level of 0.05 indicated that a total of 140 patients, with 70 patients in each group, should be included in the study. Considering potential dropouts, 150 patients will be included in the study This evaluation ensures that an adequate sample size is obtained to detect a significant difference in the incidence of hypoxemia. Throughout the ERCP procedure, all patients will be monitored using pulse oximetry, electrocardiography (ECG), and non-invasive blood pressure monitoring. Capnography will be applied in both groups, and necessary interventions will be carried out by anesthesia specialists if a patient's oxygen saturation falls below 90%. All interventions and events will be meticulously documented. Following the procedure, patients will be monitored in the post-anesthesia care unit (PACU), and those with a Post-Anesthesia Discharge Scoring System (PADSS) score of 9 or higher will be discharged. Anesthesia Management The oxygen flow rate will be maintained constant throughout the procedure. Initially, patients will receive midazolam at a dose of 0.02 mg/kg, followed by 0.3 mg/kg of ketamine. To ensure sedation, propofol will be administered as an initial bolus dose of 0.5-1.0 mg/kg; further bolus doses of 0.25-0.5 mg/kg will be given every 1-3 minutes to maintain the desired sedation level. The target sedation level will be aimed at 3-4 on the Ramsay Sedation Scale (RSS), and these target values will be preserved during the procedure. Upon completion of the procedure, patients will be awakened using verbal and tactile stimuli; once the RSS reaches 2, they will be transferred to the PACU. In the PACU, patients will be discharged if they achieve a PADSS score of 9 or above. Oxygen Reserve Index (ORi) measurement will performed on all patients. The ORi value will measured and recorded at the plateau level during the preoxygenation stage (as the baseline), immediately after the start of the procedure, at the end of the procedure, and the highest ORi value measured throughout the procedure Vital signs, procedure durations, and dosages of medications used for each patient will be meticulously recorded. All anesthesia-related decisions during the procedure will be made by the supervising anesthesia specialist.
Study Type
INTERVENTIONAL
Allocation
RANDOMIZED
Purpose
PREVENTION
Masking
NONE
Enrollment
150
Oxygen administered during the endoscopic retrograde cholangiopancreatography (ERCP) procedure will be delivered through a conventional oxygen mask. The nasal cannula is a device that provides oxygen to patients through the nasal passages.
Oxygen administered during the endoscopic retrograde cholangiopancreatography (ERCP) procedure will be delivered through a Procedural Oxygen Mask (POM® ELITE MF). The procedural oxygen mask is a device that covers both the mouth and nose to deliver oxygen to the patient. Its reservoir feature increases the concentration of delivered oxygen
Kocaeli City Hospital
Kocaeli, İ̇zmi̇t, Turkey (Türkiye)
incidence of hypoxemia
The incidence of hypoxemia during sedation (defined as SpO2 \< 90%). SpO₂ will be continuously measured using a pulse oximeter (GE Healthcare) to monitor and record oxygen saturation levels throughout sedation.
Time frame: Continuous SpO2 monitoring will be performed throughout the ERCP procedure
Number of hypoxemia episodes
An episode was recorded when SpO2 dropped below 90% after reaching a level of SpO2 ≥ 90% for 30 seconds. SpO₂ will be continuously measured using a pulse oximeter (GE Healthcare) to monitor and record oxygen saturation levels throughout sedation.
Time frame: Continuous SpO2 monitoring will be performed throughout the ERCP procedure
Duration of hypoxemia
Defined as the time taken to reach SpO2 ≥ 90%. SpO₂ will be continuously measured using a pulse oximeter (GE Healthcare) to monitor and record oxygen saturation levels throughout sedation.
Time frame: Continuous SpO2 monitoring will be performed throughout the ERCP procedure
Minimum SpO2 value observed during the procedure
Minimum SpO2 value observed during the procedure. SpO₂ will be continuously measured using a pulse oximeter (GE Healthcare) to monitor and record oxygen saturation levels throughout sedation.
Time frame: Continuous SpO2 monitoring will be performed throughout the ERCP procedure
Oxygen Reserve Index (as the baseline)
The Oxygen Reserve Index (ORi) value will be measured at the plateau level during the preoxygenation stage (as the baseline)
Time frame: Continuous Oxygen Reserve Index monitoring will be performed after prepreoxygenation
Oxygen Reserve Index (immediately after the start of the procedure)
Oxygen Reserve Index (immediately after the start of the procedure) value will bemeasured
Time frame: Continuous Oxygen Reserve Index monitoring will be performed throughout the ERCP procedure
Oxygen Reserve Index (at the end of the procedure)
Oxygen Reserve Index (at the end of the procedure) value will be measured
Time frame: Continuous Oxygen Reserve Index monitoring will be performed throughout the ERCP procedure
Oxygen Reserve Index (highest ORi value will be measured)
Oxygen Reserve Index (highest ORi value will be measured) value will be measured
Time frame: Continuous Oxygen Reserve Index monitoring will be performed throughout the ERCP procedure
airway management
This measure will assess the frequency and types of airway management interventions performed during the procedure that result in interruptions. The specific interventions include chin lift, jaw thrust, mask ventilation, need for aspiration, and repositioning of the nasal cannula or Procedural Oxygen Mask (POM). Data will be collected through direct observation and recorded in the procedural notes, capturing the number of times each intervention was required.
Time frame: Interventions related to airway management causing interruptions during the procedure
Other potential complications
Other potential complications that may arise during the procedure (hypotension, hypertension, bradycardia, tachycardia, movements that hinder the procedure) (Hypotension is defined as a decrease in the patient's baseline systolic blood pressure of more than 20% or a drop below 90 mm Hg. Hypertension is defined as an increase in the patient's baseline systolic blood pressure of more than 20%. A heart rate below 60 beats per minute is considered bradycardia, while a rate above 100 beats per minute is classified as tachycardia).
Time frame: during the procedure
Number of Participants with Early Termination of Procedure Due to Sedation
This measure will track the number of participants for whom the procedure was terminated early as a result of sedation-related factors.
Time frame: during the procedure
ERCP duration
defined as the time from the start of the procedure until the gastroscope is completely removed.
Time frame: up to 60 minutes (or the estimated average duration of the procedure)
Recovery time
defined as the time from the administration of the first anesthetic until the procedure is completely finished and Ramsey Sedation Scale (RSS) reaches 2.
Time frame: up to a maximum of 90 minutes (or the estimated average recovery time for the procedure)
Discharge time
defined as the time from the removal of the gastroscope until MPADS is 9 or above
Time frame: assessed during the recovery period, up to a maximum of 120 minutes (or the estimated average time for the procedure recovery)
Gastroenterologist satisfaction
a 10-point scoring system was used, where 0 indicates "unmanageable, numerous interruptions or terminated procedure," and 10 indicates "excellent sedation, no interruptions"
Time frame: with data reported immediately following the completion of the procedure.
Postoperative nausea, vomiting, pain, aspiration, and other potential complications
Postoperative nausea, vomiting, pain, aspiration, and other potential complications
Time frame: Data will be recorded until discharge from the PACU, which is expected to occur within up to 2 hours after the procedure."
Patient satisfaction related to anesthesia
Patient satisfaction related to anesthesia was assessed and recorded before discharge (a scale from 0 to 10 was used, where 0 means "very poor, I would never undergo this procedure again," and 10 means "excellent, I would undergo this procedure again in the same manner").
Time frame: Data will be recorded until discharge from the PACU, which is expected to occur within up to 2 hours after the procedure."
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