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Endotracheal intubation is an important emergency procedure, especially in critical care settings. Capnography-guided intubation (CGI) is a technology that may enhance procedural efficiency. This study aimed to compare the effectiveness of CGI with conventional intubation (CI) using a manikin simulation. A case-crossover manikin simulation study was conducted with three clinical scenarios: normal airway, cervical immobilization, and cardiopulmonary resuscitation. A CO2-exhalation simulation manikin was developed for this purpose. Participants were randomly assigned to perform CGI or CI first, followed by the alternative method. The primary outcome was the first-attempt success rate, and the secondary outcome was the procedure time of intubation. A linear mixed-effects model with a random effect for each subject was applied. A total of 40 participants were enrolled, and 20 in each study group. The first-attempt success rate was higher with CGI than CI across all clinical situations, with statistically significant differences in the normal airway and cervical immobilization settings. Specifically, for the normal airway, the success rate was 40 (100.0 %) for CGI vs. 33 (82.5 %) for CI [abs diff: 17.5 %, 95 % CI: 5.7 %–29.3 %]; for cervical immobilization, 39 (97.5 %) vs. 32 (80.0 %) [abs diff: 17.5 %, 95 % CI: 4.2 %–30.8 %]; and for cardiopulmonary resuscitation, 40 (100.0 %) vs. 38 (95.0 %) [abs diff: 5.0 %, 95 % CI: −1.8 %-11.8 %]. The intubation time was shorter with CGI in the normal airway and cervical immobilization scenarios. The median [interquartile range (IQR)] time for normal airway was 23.5 (19.2–28.4) sec for CGI vs. 31.6 (22.2–59.7) sec for CI, and for cervical immobilization, 24.4 (20.4–30.8) sec for CGI vs. 28.6 (22.6–56.9) sec for CI. In cardiopulmonary resuscitation, the median [IQR] was 23.1 (19.6–31.4) sec for CGI vs. 25.1 (18.6–32.4) sec for CI. In the manikin-based randomized crossover simulation, CGI achieved a higher first-attempt success rate and shorter intubation time than CI in the normal airway and cervical immobilization scenarios.

Remimazolam, a novel ultra-short-acting benzodiazepine, has gained attention for its favourable safety profile, particularly its reduced risk of respiratory depression compared to propofol during procedural sedation. However, previous studies have primarily relied on visual assessment or pulse oximetry, which may underestimate the incidence of respiratory compromise. In this prospective randomized controlled trial, we compared the respiratory effects of remimazolam and propofol using continuous capnography monitoring, a more sensitive method for detecting hypoventilation and apnoea. Seventy adult patients undergoing procedural sedation were randomly assigned to receive either remimazolam with remifentanil or propofol with remifentanil. The primary outcome was the frequency of respiratory depression events during sedation. The median [IQR] number of respiratory depression episodes was comparable between the remimazolam and propofol groups (2 [1–3] vs. 2 [1–5], p  = 0.44). Respiratory polygraphy showed no significant difference in sleep apnoea severity between groups. However, the propofol group experienced more frequent hypotensive episodes and greater blood pressure reductions. These results suggest that remimazolam does not significantly reduce the incidence of respiratory depression compared to propofol under continuous capnographic monitoring, but it may offer advantages in haemodynamic stability. Our findings support the consideration of remimazolam as a safer alternative in patients at risk of hypotension during procedural sedation. Trial registration : Clinical Trial Registry of Korea on December 2, 2021 (KCT0006797, https//cris.nih.go.kr principal investigator Suk Young Lee).

Background Hypoxia is a very common adverse event that occurs during gastrointestinal endoscopy under sedation, especially in older patients, owing to limited reservation of heart, brain, lung, and other organs. Prolonged or severe hypoxia can cause ischemia of the coronary artery and permanent nervous system damage, and even result in death. Hence, it is imperative to reduce or prevent hypoxia during gastrointestinal endoscopy under sedation in older patients. Although several oxygen delivery methods would reduce hypoxia during this procedure, early detection of respiratory depression and early administration of intervention would be the best method to reduce or even confirm the hypoxia. Capnographic monitoring is reportedly more sensitive for detecting respiratory depression before the onset of hypoxia than the current clinical routine monitoring of pulse oxygen saturation; however, its effect is controversial. Therefore, in this study, we aimed to improve the safety of gastrointestinal endoscopy under sedation in older patients. Methods A multicenter, randomized, single-blind, two-arm parallel-group, controlled with an active comparator, interventional superiority clinical trial will be conducted to evaluate the impact of an additional capnographic monitoring-based intervention on the incidence of hypoxia in older patients. Patients ( n = 1800) scheduled for gastrointestinal endoscopy with propofol sedation will be randomly assigned to either a control or interventional arm, wherein standard or capnographic monitoring is implemented, respectively. Discussion This study primarily aims to examine whether an additional capnographic monitoring-based intervention can reduce the incidence of hypoxia in older patients during gastrointestinal endoscopy under propofol and sufentanil sedation. The results of this study may extensively impact gastrointestinal endoscopy under sedation and the development of associated guidelines. Trial registration ClinicalTrials.gov NCT05030870. Registered on September 1, 2021.

Regulatory changes requiring the use of capnographic monitoring for endoscopic procedures using moderate sedation have placed financial challenges on ambulatory and hospital endoscopy centers across the United States due to the increased cost of training endoscopy personnel and purchasing both capnography-monitoring devices and specialized sampling ports. To date, there has been no published data supporting the use of capnographic monitoring in adult patients undergoing routine endoscopic procedures with moderate sedation. The aim of this randomized, parallel group assignment trial was to determine whether intervention based on capnographic monitoring improves detection of hypoxemia in patients undergoing routine esophagogastroduodenoscopy (EGD) or colonoscopy with moderate sedation. Healthy patients (ASA Physical Classification (ASAPS) I and II)) scheduled for routine outpatient EGD or colonoscopy under moderate sedation utilizing opioid and benzodiazepine combinations were randomly assigned to a blinded capnography alarm or open capnography alarm group. In both study arms, standard cardiopulmonary monitoring devices were utilized with additional capnographic monitoring. The primary end point was the incidence of hypoxemia defined as a fall in oxygen saturation (SaO2) to <90% for ≥10 s. Secondary outcomes included severe hypoxemia, apnea, disordered respirations, hypotension, bradycardia, and early procedure termination for any cause. A total of 452 patients were randomized; 218 in the EGD and 234 in the colonoscopy groups; 75 subjects in the EGD group (35.9%) and 114 patients (49.4%) in the colonoscopy group were male, and average body mass index was 27.9 and 29.1 (kg/m(2)), respectively. The blinded and open alarm groups in each study arm were similar in regards to use of opioids and/or benzodiazepines and ASAPS classification. There was no significant difference in rates of hypoxemia between the blinded and open capnography arms for EGD (54.1% vs. 49.5; P=0.5) or colonoscopy (53.8 vs. 52.1%; P=0.79). Capnographic monitoring in routine EGD or colonoscopy for ASAPS I and II patients does not reduce the incidence of hypoxemia (ClinicalTrials.gov number, NCT01994785).

Appropriate monitoring during sedation has been recognized as vital to patient safety in procedures outside of the operating room. Capnography can identify hypoventilation prior to hypoxemia; however, it is not clear whether the addition of capnography improves safety or is cost effective during routine colonoscopy, a high volume, low-risk procedure. Our aim was to evaluate the value of EtCO2 monitoring during colonoscopy with moderate sedation. We conducted a prospective study of sedation safety and patient satisfaction before and after the introduction of EtCO2 monitoring during outpatient colonoscopy with midazolam and fentanyl using the validated PROcedural Sedation Assessment Survey (PROSAS). Complications of sedation and PROSAS scores were compared among colonoscopies with and without capnography. A total of 966 patients participated in our study, 465 in the pre-EtCO2 group and 501 in the EtCO2 group. On multivariate analysis, patients and nurses reported higher levels of procedural discomfort after adoption of capnography (1.71 vs. 1.00, P<0.001). No serious adverse events were seen, and minor sedation-related adverse events occurred with similar frequency in both groups (8.2% pre-EtCO2 vs. 11.2% EtCO2, P=0.115). The cost of implementing EtCO2 in our unit was $40,169.95 and added $11.68 per case. Colonoscopy with moderate sedation is a low-risk procedure, and the addition of EtCO2 did not improve safety or patient satisfaction but did increase cost. These data suggest that routine capnography in this setting may not be cost effective and that EtCO2 might be reserved for patients at higher risk of adverse events.

Data suggest that capnography is a more sensitive measure of ventilation than standard modalities and detects respiratory depression before hypoxemia occurs. We sought to determine if adding capnography to standard monitoring during sedation of children increased the frequency of interventions for hypoventilation, and whether these interventions would decrease the frequency of oxygen desaturations. We enrolled 154 children receiving procedural sedation in a pediatric emergency department. All subjects received standard monitoring and capnography, but were randomized to whether staff could view the capnography monitor (intervention) or were blinded to it (controls). Primary outcome were the rate of interventions provided by staff for hypoventilation and the rate of oxygen desaturation less than 95%. Seventy-seven children were randomized to each group. Forty-five percent had at least 1 episode of hypoventilation. The rate of hypoventilation per minute was significantly higher among controls (7.1% vs 1.0%, P = .008). There were significantly fewer interventions in the intervention group than in the control group (odds ratio, 0.25; 95% confidence interval [CI], 0.13-0.50). Interventions were more likely to occur contemporaneously with hypoventilation in the intervention group (2.26; 95% CI, 1.34-3.81). Interventions not in time with hypoventilation were associated with higher odds of oxygen desaturation less than 95% (odds ratio, 5.31; 95% CI, 2.76-10.22). Hypoventilation is common during sedation of pediatric emergency department patients. This can be difficult to detect by current monitoring methods other than capnography. Providers with access to capnography provided fewer but more timely interventions for hypoventilation. This led to fewer episodes of hypoventilation and of oxygen desaturation.

Background Respiratory depression and airway obstruction are the most common respiratory adverse reactions in elderly patients undergoing gastroenteroscopy under sedation. Additionally, sharing the airway with endoscopists can complicate airway management. Here, we plan to apply COMBO (Capnography Monitoring Bite Block Oxygenation) endoscopy of the oropharyngeal airway, a novel airway management device with integrated capnography monitoring and dual oxygenation support, to investigate the incidence of adverse events such as hypoxaemia and airway obstruction in elderly patients during anaesthesia, providing a reference for airway management in clinical practice. Methods and findings This will be a prospective, randomized, controlled clinical study. We will enrol 164 elderly patients (aged 65–80 years) scheduled for painless gastroenteroscopy. The participants will be randomly assigned to two groups. In the experimental group, an oropharyngeal airway designed for gastroscopy will be used. The control group will receive an ordinary endoscopic bite block. The primary outcome measure will be the incidence of hypoxia (75% ≤ SpO2 < 90%, ≤ 60 s), and the secondary outcome measures will be the incidence of severe hypoxia (SpO2 < 75% or 75% ≤SpO2 < 90%, ≥ 60 s); incidence of circulatory fluctuations [severe bradycardia (< 50 beats/min), a mean arterial pressure (MAP) fluctuation greater than 30% of the baseline value or an MAP < 60 mmHg]; incidence of airway intervention; dose of additional drugs administered during the procedure; endoscopist satisfaction; and incidence of various adverse events. Results This clinical study aims to evaluate whether an oropharyngeal airway dedicated to gastroscopy can effectively maintain airway patency and alleviate retrolingual collapse, thereby preventing hypoxaemia. It also aims to determine whether it can reduce the incidence of respiratory-related adverse events. Trial Registration This clinical trial protocol was formally registered at ClinicalTrials.gov (Registration Number: NCT06711328) on November 26, 2024.

We hypothesize that capnography could detect hypoventilation during induction of bronchoscopic sedation and starting bronchoscopy following hypoventilation, may decrease hypoxemia. Patients were randomized to: starting bronchoscopy when hypoventilation (hypopnea, two successive breaths of at least 50% reduction of the peak wave compared to baseline or apnea, no wave for 10 seconds) (Study group, n = 55), or when the Observer Assessment of Alertness and Sedation scale (OAAS) was less than 4 (Control group, n = 59). Propofol infusion was titrated to maintain stable vital signs and sedative levels. The hypoventilation during induction in the control group and the sedative outcome were recorded. The patient characteristics and procedures performed were similar. Hypoventilation was observed in 74.6% of the patients before achieving OAAS < 4 in the control group. Apnea occurred more than hypopnea (p < 0.0001). Hypoventilation preceded OAAS < 4 by 96.5 ± 88.1 seconds. In the study group, the induction time was shorter (p = 0.03) and subjects with any two events of hypoxemia during sedation, maintenance or recovery were less than the control group (1.8 vs. 18.6%, p < 0.01). Patient tolerance, wakefulness during sedation, and cooperation were similar in both groups. Significant hypoventilation occurred during the induction and start bronchoscopy following hypoventilation may decrease hypoxemia without compromising patient tolerance.

The aim of this study was to compare the efficiency, safety, and outcomes of the high-flow nasal oxygen cannula (HFNC) and conventional oxygen therapy (COT) after extubation in children. A randomized controlled trial was conducted in a 13 bed pediatric intensive care unit. One-hundred children who underwent extubation were eligible for the study. Patients were divided into HFNC (n=50) and COT (n=50) groups. Basal variables including heart rate (HR), noninvasive blood pressure, respiratory rate (RR), SpO 2 , SpO 2 /FiO 2 (SF) ratio, and end tidal CO 2 (EtCO 2 ) were obtained initially and recorded at 15, 30, and 45 minutes and at 1, 6, 12 hours, 24 and 48 hours after extubation. SF ratio and SpO 2 increased during the first hour in the HFNC group (p=0.005 and p=0.03, respectively). HR and RR decreased during follow-up in the HFNC group (p=0.001 and p=0.048, respectively). There was no statistically significant difference for PCO 2 after extubation between the two groups. PCO 2 (p=0.008) and EtCO2 (p=0.018) values at 24-h were different between two groups. At follow-up, HR decreased only in the HFNC group (p=0.001) and was different at 12 and 48 hours (p=0.047 and p=0.01, respectively). Initial modified radiologic atelectasis scores (m-RAS) were higher for the HFNC group and decreased steadily (p=0.001). Extubation failure rates were 4% and 22% for the HFNC and COT groups, respectively (p=0.007). In conclusion, HFNC is better than COT, especially for the restoration of the respiratory and radiologic parameters. Although more expensive, the use of HFNC may have more advantages to reduce the risk of extubation failure in critically ill children compared with COT.

Dead space is an important component of ventilation–perfusion abnormalities. Measurement of dead space has diagnostic, prognostic and therapeutic applications. In the intensive care unit (ICU) dead space measurement can be used to guide therapy for patients with acute respiratory distress syndrome (ARDS); in the emergency department it can guide thrombolytic therapy for pulmonary embolism; in peri-operative patients it can indicate the success of recruitment maneuvers. A newly available technique called volumetric capnography (Vcap) allows measurement of physiological and alveolar dead space on a regular basis at the bedside. We discuss the components of dead space, explain important differences between the Bohr and Enghoff approaches, discuss the clinical significance of arterial to end-tidal CO 2 gradient and finally summarize potential clinical indications for Vcap measurements in the emergency room, operating room and ICU.