Comparative effectiveness of alternative spontaneous breathing trial techniques: a systematic review and network meta-analysis of randomized trials.

BACKGROUND: The spontaneous breathing trial (SBT) technique that best balance successful extubation with the risk for reintubation is unknown. We sought to determine the comparative efficacy and safety of alternative SBT techniques. METHODS: We searched Medline, EMBASE, and the Cochrane Central Register of Controlled Trials from inception to February 2023 for randomized or quasi-randomized trials comparing SBT techniques in critically ill adults and children and reported initial SBT success, successful extubation, reintubation (primary outcomes) and mortality (ICU, hospital, most protracted; secondary outcome) rates. Two reviewers screened, reviewed full-texts, and abstracted data. We performed frequentist random-effects network meta-analysis. RESULTS: We included 40 RCTs (6716 patients). Pressure Support (PS) versus T-piece SBTs was the most common comparison. Initial successful SBT rates were increased with PS [risk ratio (RR) 1.08, 95% confidence interval (CI) (1.05-1.11)], PS/automatic tube compensation (ATC) [1.12 (1.01 -1.25), high flow nasal cannulae (HFNC) [1.07 (1.00-1.13) (all moderate certainty), and ATC [RR 1.11, (1.03-1.20); low certainty] SBTs compared to T-piece SBTs. Similarly, initial successful SBT rates were increased with PS, ATC, and PS/ATC SBTs compared to continuous positive airway pressure (CPAP) SBTs. Successful extubation rates were increased with PS [RR 1.06, (1.03-1.09); high certainty], ATC [RR 1.13, (1.05-1.21); moderate certainty], and HFNC [RR 1.06, (1.02-1.11); high certainty] SBTs, compared to T-piece SBTs. There was little to no difference in reintubation rates with PS (vs. T-piece) SBTs [RR 1.05, (0.91-1.21); low certainty], but increased reintubation rates with PS [RR 2.84, (1.61-5.03); moderate certainty] and ATC [RR 2.95 (1.57-5.56); moderate certainty] SBTs compared to HFNC SBTs. CONCLUSIONS: SBTs conducted with pressure augmentation (PS, ATC, PS/ATC) versus without (T-piece, CPAP) increased initial successful SBT and successful extubation rates. Although SBTs conducted with PS or ATC versus HFNC increased reintubation rates, this was not the case for PS versus T-piece SBTs.

Multicentre validation of a machine learning model for predicting respiratory failure after noncardiac surgery.

BACKGROUND: Postoperative respiratory failure is a serious complication that could benefit from early accurate identification of high-risk patients. We developed and validated a machine learning model to predict postoperative respiratory failure, defined as prolonged (>48 h) mechanical ventilation or reintubation after surgery. METHODS: Easily extractable electronic health record (EHR) variables that do not require subjective assessment by clinicians were used. From EHR data of 307,333 noncardiac surgical cases, the model, trained with a gradient boosting algorithm, utilised a derivation cohort of 99,025 cases from Seoul National University Hospital (2013-9). External validation was performed using three separate cohorts A-C from different hospitals comprising 208,308 cases. Model performance was assessed by area under the receiver operating characteristic (AUROC) curve and area under the precision-recall curve (AUPRC), a measure of sensitivity and precision at different thresholds. RESULTS: The model included eight variables: serum albumin, age, duration of anaesthesia, serum glucose, prothrombin time, serum creatinine, white blood cell count, and body mass index. Internally, the model achieved an AUROC of 0.912 (95% confidence interval [CI], 0.908-0.915) and AUPRC of 0.113. In external validation cohorts A, B, and C, the model achieved AUROCs of 0.879 (95% CI, 0.876-0.882), 0.872 (95% CI, 0.870-0.874), and 0.931 (95% CI, 0.925-0.936), and AUPRCs of 0.029, 0.083, and 0.124, respectively. CONCLUSIONS: Utilising just eight easily extractable variables, this machine learning model demonstrated excellent discrimination in both internal and external validation for predicting postoperative respiratory failure. The model enables personalised risk stratification and facilitates data-driven clinical decision-making.

Preoperative neurologic comorbidity and unanticipated early postoperative reintubation: a multicentre cohort study.

BACKGROUND: The risk of respiratory complications is highest in the first 72 h post-surgery. Postoperative respiratory events can exacerbate pre-existing respiratory compromise and lead to reintubation of the trachea, particularly in patients with neurologic disorders. This study examined the association between neurologic comorbidities and unanticipated early postoperative reintubation in children. METHODS: This multicentre, 1:1 propensity score-matched study included 420 096 children who underwent inpatient, elective, noncardiac surgery at National Surgical Quality Improvement Program reporting hospitals in 2012-22. The primary outcome was unanticipated early postoperative reintubation within 72 h after surgery. The secondary outcome was prolonged postoperative mechanical ventilation, defined as ventilator use >72 h. We also evaluated 30-day mortality in patients requiring reintubation. RESULTS: Cerebral palsy was associated with the highest risk of early reintubation (adjusted relative risk [RRadj]: 1.97, 95% confidence interval [CI]: 1.44-2.69; P<0.01), followed by seizure disorders (RRadj: 1.87, 95% CI: 1.50-2.34; P<0.01), neuromuscular disorders (RRadj: 1.76, 95% CI: 1.41-2.19; P<0.01), and structural central nervous system abnormalities (RRadj: 1.35, 95% CI: 1.13-1.61; P<0.01). Unanticipated early postoperative reintubation was associated with an eight-times increased risk of 30-day mortality (adjusted hazard ratio: 8.1, 95% CI: 6.0-11.1; P<0.01). Risk of prolonged postoperative mechanical ventilation was also increased with neurologic comorbidities, particularly seizure disorders (RRadj: 1.73, 95% CI: 1.55-1.93; P<0.01). CONCLUSIONS: Children with neurologic comorbidities have an increased risk of unanticipated early postoperative reintubation and prolonged mechanical ventilation. Given the high mortality risk associated with these outcomes, children with neurologic comorbidities require heightened monitoring and risk assessment.

Reintubation Rate and Mortality After Emergent Airway Management Outside the Operating Room.

BACKGROUND: Little is known about reintubations outside of the operating room. The objective of this study was to evaluate the reintubation rate and mortality after emergent airway management outside operating room (OR), including intensive care unit (ICU) and nonICU settings. METHODS: A retrospective cohort study. The primary outcome measures were reintubation rate and mortality. Secondary outcome measures were location and indication for intubation, time until reintubation, total intubated days, ICU-stay, hospital-stay, 30-day in-hospital mortality, and overall in-hospital mortality. RESULTS: A total of 336 outside-OR intubations were performed in 275 patients. Of those 275 patients, 51 (18.5%) were reintubated during the same hospital admission. (41%) of the reintubations occurred in a non-ICU setting. Reintubations occurred after up to 30-days after extubation. Most frequently between 7 and 30 days (32.8%, n = 20). Most of the reintubated patients were reintubated just once (56.9%; n = 29), but some were reintubated 2 times (29.4%; n = 15) or over 3 times (13.7%; n = 7). Reintubated patients had significant longer total ICU-stay (24 ± 3 days vs 12 ± 1 day, p < .001), hospital stay (37 ± 3 vs18 ± 1, p < .001), and total intubation days (8 ± 1 vs 7 ± 0.6, P < .02). The 30-day in-hospital mortality in reintubated patients was 13.7% (n = 7) compared to nonreintubated patients 35.9% (n = 80; P = .002). CONCLUSION: Reintubation was associated with a significant increase in hospital and ICU stay. The higher mortality rate among nonreintubated patients may indicate survival bias, in that severely sick patients did not survive long enough to attempt extubation.

Ultrasound evaluation of cardiac and diaphragmatic function at different positions during a spontaneous breathing trial predicting extubation outcomes: a retrospective cohort study.

BACKGROUND: The ratio (E/Ea) of mitral Doppler inflow velocity to annular tissue Doppler wave velocity by transthoracic echocardiography and diaphragmatic excursion (DE) by diaphragm ultrasound have been confirmed to predict extubation outcomes. However, few studies focused on the predicting value of E/Ea and DE at different positions during a spontaneous breathing trial (SBT), as well as the effects of △E/Ea and △DE (changes in E/Ea and DE during a SBT). METHODS: This study was a reanalysis of the data of 60 difficult-to-wean patients in a previous study published in 2017. All eligible participants were organized into respiratory failure (RF) group and extubation success (ES) group within 48 h after extubation, or re-intubation (RI) group and non-intubation (NI) group within 1 week after extubation. The risk factors for respiratory failure and re-intubation including E/Ea and △E/Ea, DE and △DE at different positions were analyzed by multivariate logistic regression, respectively. The receiver operating characteristic (ROC) curves of E/Ea (septal, lateral, average) and DE (right, left, average) were compared with each other, respectively. RESULTS: Of the 60 patients, 29 cases developed respiratory failure within 48 h, and 14 of those cases required re-intubation within 1 week. Multivariate logistic regression showed that E/Ea were all associated with respiratory failure, while only DE (right) and DE (average) after SBT were related to re-intubation. There were no statistic differences among the ROC curves of E/Ea at different positions, nor between the ROC curves of DE. No statistical differences were shown in △E/Ea between RF and ES groups, while △DE (average) was remarkably higher in NI group than that in RI group. However, multivariate logistic regression analysis showed that △DE (average) was not associated with re-intubation. CONCLUSIONS: E/Ea at different positions during a SBT could predict postextubation respiratory failure with no statistical differences among them. Likewise, only DE (right) and DE (average) after SBT might predict re-intubation with no statistical differences between each other.

Investigating the risk of reintubation by cough force assessment using cough peak expiratory flow: a single-center observational pilot study.

BACKGROUND: No objective indicator exists for evaluating cough strength during extubation of tracheally intubated patients. This study aimed to determine whether cough peak expiratory flow (CPEF) can predict the risk of reintubation due to decreased cough strength. METHODS: This was a retrospective cohort study of patients who were admitted to our Emergency Intensive Care Unit between September 1, 2020 and August 31, 2021 and were under artificial ventilation management for ≥ 24 h. The patients were divided into two groups: successful extubation and reintubation groups, and the relationship between CPEF immediately before extubation and reintubation was investigated. RESULTS: Seventy-six patients were analyzed. In the univariate analysis, CPEF was significantly different between the successful extubation (90.7 ± 25.9 L/min) and reintubation (57.2 ± 6.4 L/min) groups (p < 0.001). In the multivariate analysis with age and duration of artificial ventilation as covariates, CPEF was significantly lower in the reintubation group (p < 0.01). The cutoff value of CPEF for reintubation according to the receiver operating characteristic curve was 60 L/min (area under the curve, 0.897; sensitivity, 78.5%; specificity, 90.9%; p < 0.01). CONCLUSION: CPEF in tracheally intubated patients may be a useful indicator for predicting the risk of reintubation associated with decreased cough strength. The cutoff CPEF value for reintubation due to decreased cough strength was 60 L/min.

Peripheral perfusion index as a predictor of reintubation in critically ill surgical patients.

PURPOSE: We aimed to evaluate the ability of the peripheral perfusion index (PPI) to predict reintubation of critically ill surgical patients. METHODS: This prospective observational study included mechanically ventilated adults who were extubated after a successful spontaneous breathing trial (SBT). The patients were followed up for the next 48 h for the need for reintubation. The heart rate, systolic blood pressure, respiratory rate, peripheral arterial oxygen saturation (SpO2), and PPI were measured before-, at the end of SBT, 1 and 2 h postextubation. The primary outcome was the ability of PPI 1 h postextubation to predict reintubation using area under the receiver operating characteristic curve (AUC) analysis. Univariate and multivariate analyses were performed to identify predictors for reintubation. RESULTS: Data from 62 patients were analysed. Reintubation occurred in 12/62 (19%) of the patients. Reintubated patients had higher heart rate and respiratory rate; and lower SpO2 and PPI than successfully weaned patients. The AUC (95%confidence interval) for the ability of PPI at 1 h postextubation to predict reintubation was 0.82 (0.71-0.91) with a negative predictive value of 97%, at a cutoff value of ≤ 2.5. Low PPI and high respiratory rate were the independent predictors for reintubation. CONCLUSION: PPI early after extubation is a useful tool for prediction of reintubation. Low PPI is an independent risk factor for reintubation. A PPI > 2.5, one hour after extubation can confirm successful extubation.

Ability of parasternal intercostal muscle thickening fraction to predict reintubation in surgical patients with sepsis.

OBJECTIVES: We aimed to evaluate the ability of the parasternal intercostal (PIC) thickening fraction during spontaneous breathing trial (SBT) to predict the need for reintubation within 48 h after extubation in surgical patients with sepsis. METHODS: This prospective observational study included adult patients with sepsis who were mechanically ventilated and indicated for SBT. Ultrasound measurements of the PIC thickening fraction and diaphragmatic excursion (DE) were recorded 15 min after the start of the SBT. After extubation, the patients were followed up for 48 h for the need for reintubation. The study outcomes were the ability of the PIC thickening fraction (primary outcome) and DE to predict reintubation within 48 h of extubation using area under receiver characteristic curve (AUC) analysis. The accuracy of the model including the findings of right PIC thickening fraction and right DE was also assessed using the current study cut-off values. Multivariate analysis was performed to identify independent risk factors for reintubation. RESULTS: We analyzed data from 49 patients who underwent successful SBT, and 10/49 (20%) required reintubation. The AUCs (95% confidence interval [CI]) for the ability of right and left side PIC thickening fraction to predict reintubation were 0.97 (0.88-1.00) and 0.96 (0.86-1.00), respectively; at a cutoff value of 6.5-8.3%, the PIC thickening fraction had a negative predictive value of 100%. The AUCs for the PIC thickening fraction and DE were comparable; and both measures were independent risk factors for reintubation. The AUC (95% CI) of the model including the right PIC thickening fraction > 6.5% and right DE ≤ 18 mm to predict reintubation was 0.99 (0.92-1.00), with a positive predictive value of 100% when both sonographic findings are positive and negative predictive value of 100% when both sonographic findings are negative. CONCLUSIONS: Among surgical patients with sepsis, PIC thickening fraction evaluated during the SBT is an independent risk factor for reintubation. The PIC thickening fraction has an excellent predictive value for reintubation. A PIC thickening fraction of ≤ 6.5-8.3% can exclude reintubation, with a negative predictive value of 100%. Furthermore, a combination of high PIC and low DE can also indicate a high risk of reintubation. However, larger studies that include different populations are required to replicate our findings and validate the cutoff values.

Safe Landing: Feasibility and Safety of Operating Room Extubation in Minimally Invasive Cardiac Valve Surgery.

OBJECTIVE: This study was designed to explore key safety outcomes after operating room (OR) extubation in minimally invasive cardiac valve surgery. DESIGN: Single-center retrospective chart review. SETTING: Academic medical center in the United States. PARTICIPANTS: Patients undergoing valvular surgery via thoracotomy (November 2017-October 2022) at a single institution. INTERVENTIONS: The OR extubation protocol was implemented on August 20, 2020. MEASUREMENTS AND MAIN RESULTS: Delirium rates, reintubation rates, and intubation duration were compared before and after OR extubation protocol implementation. Logistic regression identified patient perioperative characteristics associated with unsuccessful OR extubation. Among 312 patients, 254 were extubated in the intensive care unit (ICU) and 58 in the OR. Preoperative demographics were comparable except for the Charlson Comorbidity Index (median: 2.0 ICU extubation v 1.5 OR extubation). Interrupted time series analysis showed no change in postoperative delirium post-OR extubation implementation, with a trend toward decreasing delirium (risk ratio = 0.37, CI: 0.13-1.10, p = 0.07). The postimplementation era also had a lower median intubation duration (8 hours v 13 hours, p < 0.001) without increasing reintubation rates (1.7% v 7.9%, p = 0.159). Increased bypass length (odds ratio = 0.99, CI: 0.98-0.99, p < 0.001), intraoperative morphine milligram equivalents (odds ratio = 0.99, CI: 0.99-1.0, p = 0.009), and preoperative Charlson Comorbidity Index above 3 (odds ratio = 0.42, CI: 0.19-0.95, p = 0.037) were associated with decreased odds of OR extubation. CONCLUSIONS: OR extubation was not associated with increased postoperative delirium or reintubation rates but did decrease intubation duration. Successful OR extubation relies upon the consideration of various patient perioperative characteristics.

Risks for prolonged mechanical ventilation and reintubation after cervical malignant tumor surgery: a nested case-control study.

PURPOSE: Prolonged mechanical ventilation (PMV) and reintubation are among the most serious postoperative adverse events associated with malignant cervical tumors. In this study, we aimed to clarify the incidence, characteristics, and risk factors for PMV and reintubation in target patients. METHODS: This retrospective nested case-control study was performed between January 2014 and January 2020 at a large spinal tumor center in China. Univariate analysis was used to identify the possible risk factors associated with PMV and reintubation. Logistic regression analysis was performed to estimate the odds ratios (ORs) and 95% confidence intervals (CIs) with covariates of a probability < 0.05 in univariate analysis. RESULTS: From a cohort of 560 patients with primary malignant (n = 352) and metastatic (n = 208) cervical tumors, 27 patients required PMV and 20 patients underwent reintubation. The incidence rates of PMV and reintubation were 4.82% and 3.57%, respectively. Three variables (all p < 0.05) were independently associated with an increased risk of PMV: Karnofsky Performance Status < 50 compared to ≥ 80, operation duration ≥ 8 h compared to < 6 h, and C4 nerve root encased by the tumor. Longer operative duration and preoperative hypercapnia (all p < 0.05) were independent risk factors for postoperative reintubation, both of which led to longer length of stay (32.6 ± 30.8 vs. 10.7 ± 5.95 days, p < 0.001), with an in-hospital mortality of 17.0%. CONCLUSION: Our results demonstrate the risk factors for PMV or reintubation after surgery for malignant cervical tumors. Adequate assessment, early detection, and prevention are necessary for this high-risk population.

Time definition of reintubation most relevant to patient outcomes in critically ill patients: a multicenter cohort study.

BACKGROUND: Reintubation is a common complication in critically ill patients requiring mechanical ventilation. Although reintubation has been demonstrated to be associated with patient outcomes, its time definition varies widely among guidelines and in the literature. This study aimed to determine the association between reintubation and patient outcomes as well as the consequences of the time elapsed between extubation and reintubation on patient outcomes. METHODS: This was a multicenter retrospective cohort study of critically ill patients conducted between April 2015 and March 2021. Adult patients who underwent mechanical ventilation and extubation in intensive care units (ICUs) were investigated utilizing the Japanese Intensive Care PAtient Database. The primary and secondary outcomes were in-hospital and ICU mortality. The association between reintubation and clinical outcomes was studied using Cox proportional hazards analysis. Among the patients who underwent reintubation, a Cox proportional hazard analysis was conducted to evaluate patient outcomes according to the number of days from extubation to reintubation. RESULTS: Overall, 184,705 patients in 75 ICUs were screened, and 1849 patients underwent reintubation among 48,082 extubated patients. After adjustment for potential confounders, multivariable analysis revealed a significant association between reintubation and increased in-hospital and ICU mortality (adjusted hazard ratio [HR] 1.520, 95% confidence interval [CI] 1.359-1.700, and adjusted HR 1.325, 95% CI 1.076-1.633, respectively). Among the reintubated patients, 1037 (56.1%) were reintubated within 24 h after extubation, 418 (22.6%) at 24-48 h, 198 (10.7%) at 48-72 h, 111 (6.0%) at 72-96 h, and 85 (4.6%) at 96-120 h. Multivariable Cox proportional hazard analysis showed that in-hospital and ICU mortality was highest in patients reintubated at 72-96 h (adjusted HR 1.528, 95% CI 1.062-2.197, and adjusted HR 1.334, 95% CI 0.756-2.352, respectively; referenced to reintubation within 24 h). CONCLUSIONS: Reintubation was associated with a significant increase in in-hospital and ICU mortality. The highest mortality rates were observed in patients who were reintubated between 72 and 96 h after extubation. Further studies are warranted for the optimal observation of extubated patients in clinical practice and to strengthen the evidence for mechanical ventilation.

A machine learning approach to predicting early and late postoperative reintubation.

Accurate estimation of surgical risks is important for informing the process of shared decision making and informed consent. Postoperative reintubation (POR) is a severe complication that is associated with postoperative morbidity. Previous studies have divided POR into early POR (within 72 h of surgery) and late POR (within 30 days of surgery). Using data provided by American College of Surgeons (ACS) National Surgical Quality Improvement Program (NSQIP), machine learning classification models (logistic regression, random forest classification, and gradient boosting classification) were utilized to develop scoring systems for the prediction of combined, early, and late POR. The risk factors included in each scoring system were narrowed down from a set of 37 pre and perioperative factors. The scoring systems developed from the logistic regression models demonstrated strong performance in terms of both accuracy and discrimination across the different POR outcomes (Average Brier score, 0.172; Average c-statistic, 0.852). These results were only marginally worse than prediction using the full set of risk variables (Average Brier score, 0.145; Average c-statistic, 0.870). While more work needs to be done to identify clinically relevant differences between the early and late POR outcomes, the scoring systems provided here can be used by surgeons and patients to improve the quality of care overall.

Incidence and Outcome of Reintubation in the Postanesthesia Care Unit: A Single-Center, Retrospective, Observational Matched Cohort Study in China.

PURPOSE: To investigate the incidence and outcome of reintubation after planned extubation (RAP) in the postanesthesia care unit (PACU) in China. DESIGN: A single-center, retrospective, 1:2 matched cohort study following the Strengthening the Reporting of Observational Studies in Epidemiology (STROBE) Statement. METHODS: Among 121,965 patients in the PACU, 14 patients with RAP were included in this study from January 1, 2017 to December 31, 2019. PACU length of stay, postoperative length of stay in hospital, inpatient healthcare costs, and outcomes were compared between the RAP and the matched groups. FINDINGS: The incidence of RAP was 0.0115%. After propensity score matching, there were no statistically significant differences in age, sex, body mass index (BMI), elective/nonelective procedure, surgical classification, American Society of Anesthesiologists physical status, the duration of anesthesia, or the duration of surgical procedure between the two groups. PACU length of stay, postoperative length of stay in hospital, and inpatient healthcare costs significantly differed between the RAP group and the matched group (P < .01 for all). The percentage of patients with longer PACU length of stay in the RAP group was significantly higher than that in the matched group (92.86% vs 7.14%), with an odds ratio of 29.87 (95% confidence interval = 14.00-2,040.54, P < .001). CONCLUSIONS: Despite its low incidence, RAP in the PACU may be associated with life-threatening and severe complications with longer PACU length of stay, unexpected intensive care unit admission, longer hospitalization length, longer postoperative length of stay in hospital, and increased inpatient health costs. Appropriate timing of extubation and monitoring in the PACU can effectively prevent the occurrence of RAP and improve patient prognosis.

Risk factors for reintubation and mortality among patients who had unplanned extubation.

BACKGROUND: Unplanned extubation (UE) occurs among 2%-16% of patients with mechanical ventilation (MV). Failed UE requiring reintubation could be associated with several adverse events. AIMS: The aim of this study was to investigate the outcomes and prognostic factors of patients with UE in intensive care units (ICUs). METHODS: We prospectively registered the patients who had UE and retrospectively reviewed the electronic medical records for 96-bed ICUs between 1 January 2009, and 31 December 2020. RESULTS: A total of 392 patients had UE, and 234 patients (59.7%) were ≥65 years (older adult group). The median Acute Physiology and Chronic Health Evaluation (APACHE) II score were 17 and the median Glasgow Coma Scale score was 10. In total, 205 patients (52.3%) were reintubated within 48 h (due to failed UE) and 75 patients (19.1%) died during hospitalization. Multivariate analyses were performed to evaluate those factors predicting failed UE and mortality. These analyses demonstrated that higher positive end-expiratory pressure (PEEP) and the admission APACHE II scores predicted failed UE. A higher fraction of inspiration O2 (FiO2 ) and minute ventilation; lower haemoglobin (Hb); and higher instances of liver cirrhosis, cancer, and failed UE were independently associated with hospital mortality. CONCLUSION: We concluded that among patients who had UE, higher FiO2 or minute ventilation, or under MV or with lower Hb, liver cirrhosis, cancer, and failed UE tended to have higher mortality. RELEVANCE TO CLINICAL PRACTICE: Patients with high disease severity indices who have an increased risk of UE required special attention to techniques to prevent endotracheal tubes from accidental removal.

Postoperative Respiratory Failure After Elective Abdominal Surgery: A Case-Control Study.

INTRODUCTION: Postoperative respiratory failure (PRF) contributes significantly to morbidity and mortality. We sought to identify patient characteristics and perioperative risk factors associated with PRF in patients undergoing elective abdominal surgery to improve patient outcomes. METHODS: We retrospectively reviewed patients undergoing elective abdominal surgery from 2011 to 2016 at our institution. An experimental group consisting of adult patients with the Patient Safety Indicator 11 diagnosis of PRF was compared with a time-matched control group. RESULTS: Each group consisted of 233 patients. Comorbidities associated with PRF included ascites, coronary artery disease, chronic kidney disease, chronic obstructive pulmonary disease, diabetes mellitus type II, hypertension, and hypoalbuminemia (P < 0.05). American Society of Anesthesiologists score IV (20.2% versus 3.95%; P < 0.001), operative time (4.13 versus 2.55 h; P < 0.001), laparotomy with open operation (77.7% versus 45.5%; P < 0.001), and net intraoperative fluid balance (3635 versus 2410 mL; P < 0.001) were higher in patients with PRF. On multivariate analysis, age, American Society of Anesthesiologists score, chronic obstructive pulmonary disease, diabetes mellitus type II, laparotomy, and net intraoperative fluid balance maintained significance (P < 0.05). CONCLUSIONS: We identified contributing pre- and intra-operative risk factors for PRF undergoing elective abdominal surgery. These findings may help identify those at increased risk for respiratory failure and mitigate complications.

Effect of high-flow oxygen versus T-piece ventilation strategies during spontaneous breathing trials on weaning failure among patients receiving mechanical ventilation: a randomized controlled trial.

BACKGROUND: A spontaneous breathing trial (SBT) is used to determine whether patients are ready for extubation, but the best method for choosing the SBT strategy remains controversial. We investigated the effect of high-flow oxygen versus T-piece ventilation strategies during SBT on rates of weaning failure among patients receiving mechanical ventilation. METHODS: This randomized clinical trial was conducted from June 2019 through January 2022 among patients receiving mechanical ventilation for ≥ 12 h who fulfilled the weaning readiness criteria at a single-center medical intensive care unit. Patients were randomized to undergo either T-piece SBT or high-flow oxygen SBT. The primary outcome was weaning failure on day 2, and the secondary outcomes were weaning failure on day 7, ICU and hospital length of stay, and ICU and in-hospital morality. RESULTS: Of 108 patients (mean age, 67.0 ± 11.1 years; 64.8% men), 54 received T-piece SBT and 54 received high-flow oxygen SBT. Weaning failure on day 2 occurred in 5 patients (9.3%) in the T-piece group and 3 patients (5.6%) in the high-flow group (difference, 3.7% [95% CI, - 6.1-13.6]; p = 0.713). Weaning failure on day 7 occurred in 13 patients (24.1%) in the T-piece group and 7 patients (13.0%) in the high-flow group (difference, 11.1% [95% CI, - 3.4-25.6]; p = 0.215). A post hoc subgroup analysis showed that high-flow oxygen SBT was significantly associated with a lower rate of weaning failure on day 7 (OR, 0.17 [95% CI, 0.04-0.78]) among those patients intubated because of respiratory failure (p for interaction = 0.020). The ICU and hospital length of stay and mortality rates did not differ significantly between the two groups. During the study, no serious adverse events were recorded. CONCLUSIONS: Among patients receiving mechanical ventilation, high-flow oxygen SBT did not significantly reduce the risk of weaning failure compared with T-piece SBT. However, the study may have been underpowered to detect a clinically important treatment effect for the comparison of high-flow oxygen SBT versus T-piece SBT, and a higher percentage of patients with simple weaning and a lower weaning failure rate than expected should be considered when interpreting the findings. Clinical trial registration This trial was registered with ClinicalTrials.gov (number NCT03929328) on April 26, 2019.

Protocolized Postextubation Respiratory Support to Prevent Reintubation: A Randomized Clinical Trial.

Rationale: Respiratory support (noninvasive ventilation or high-flow nasal cannula) applied at the time of extubation has been reported to reduce reintubation rates, but concerns regarding effectiveness have limited uptake into practice.Objectives: To determine if providing postextubation respiratory support to all patients undergoing extubation in a medical ICU would decrease the incidence of reintubation.Methods: We conducted a pragmatic, two-armed, cluster-crossover trial of adults undergoing extubation from invasive mechanical ventilation between October 1, 2017, and March 31, 2019, in the medical ICU of an academic medical center. Patients were assigned to either protocolized postextubation respiratory support (a respiratory therapist-driven protocol in which patients with suspected hypercapnia received noninvasive ventilation and patients without suspected hypercapnia received high-flow nasal cannula) or usual care (postextubation management at the discretion of treating clinicians). The primary outcome was reintubation within 96 hours of extubation.Measurements and Main Results: A total of 751 patients were enrolled. Of the 359 patients assigned to protocolized support, 331 (92.2%) received postextubation respiratory support compared with 66 of 392 patients (16.8%) assigned to usual care, a difference driven by differential use of high-flow nasal cannula (74.7% vs. 2.8%). A total of 57 patients (15.9%) in the protocolized support group experienced reintubation compared with 52 patients (13.3%) in the usual care group (odds ratio, 1.23; 95% confidence interval, 0.82 to 1.84; P = 0.32).Conclusions: Among a broad population of critically ill adults undergoing extubation from invasive mechanical ventilation at an academic medical center, protocolized postextubation respiratory support, primarily characterized by an increase in the use of high-flow nasal cannula, did not prevent reintubation compared with usual care.Clinical trial registered with www.clinicaltrials.gov (NCT0328831).

Risk factors associated with reintubations in children undergoing foreign body removal using flexible bronchoscopy: a single-center retrospective cross-sectional study.

BACKGROUND: Reintubation is a severe complication during foreign body (FB) removal that uses flexible bronchoscopy. OBJECTIVE: To investigate the incidence and risk factors for reintubations in children undergoing FB extraction by flexible bronchoscopy in a single center. DESIGN: A retrospective cross-sectional study. SETTING: All children with foreign body aspiration at Fujian Maternity and Child Health Hospital, Affiliated Hospital of Fujian Medical University from January 2015 to December 2020. PATIENTS: Children with FB removal using a flexible bronchoscopy were enrolled in the trial according to the inclusion criteria. MEASUREMENTS: Both multivariable and logistic regression analyses were used to analyze the association between characteristic data and reintubations. The results were presented as odds ratios (ORs) with 95% confidence intervals (CIs). RESULTS: In total, 244 patients met with the inclusion criteria and were included in the analysis. Among those participants, 28 children (11.5%) underwent reintubations after FB removal by flexible bronchoscopy. Independent factors associated with reintubations were identified as operative time ≥ 60 min [OR: 3.68, 95% CI (1.64-8.82)] and ASA ≥ III [OR: 5.7, 95% CI (1.23-26.4)]. CONCLUSIONS: Children undergoing FB removal by a flexible bronchoscopy may encounter with a high incidence of postoperative reintubations. Both long operative duration and a severe physical status cause a growing risk of reintubations.

Association Between Early Extubation and Postoperative Reintubation After Elective Cardiac Surgery: A Bi-institutional Study.

OBJECTIVE: It is unknown if remaining intubated after cardiac surgery is associated with a decreased risk of postoperative reintubation. The primary objective of this study was to investigate whether there was an association between the timing of extubation and the risk of reintubation after cardiac surgery. DESIGN: A retrospective, observational study. SETTING: Two university-affiliated tertiary care centers. PARTICIPANTS: A total of 9,517 patients undergoing either isolated coronary artery bypass grafting (CABG) or aortic valve replacement (AVR). INTERVENTIONS: None. MEASUREMENTS AND MAIN RESULTS: A total of 6,609 isolated CABGs and 2,908 isolated AVRs were performed during the study period. Reintubation occurred in 112 patients (1.64%) after CABG and 44 patients (1.5%) after AVR. After multivariate logistic regression analysis, early extubation (within the first 6 postoperative hours) was not associated with a risk of reintubation after CABG (odds ratio [OR] 0.53, 95% CI 0.26-1.06) and AVR (OR 0.52, 95% CI 0.22-1.22). Risk factors for reintubation included increased age in both the CABG (OR per 10-year increase, 1.63; 95% CI 1.28-2.08) and AVR (OR per 10-year increase, 1.50; 95% CI 1.12-2.01) cohorts. Total bypass time, race, and New York Heart Association (NYHA) functional class were not associated with reintubation risk. CONCLUSION: Reintubation after CABGs and AVRs is a rare event, and advanced age is an independent risk factor. Risk is not increased with early extubation. This temporal association and low overall rate of reintubation suggest the strategies for extubation should be modified in this patient population.

Association of weaning failure from mechanical ventilation with transthoracic echocardiography parameters: a systematic review and meta-analysis.

BACKGROUND: Weaning from mechanical ventilation is a challenging step during recovery from critical illness. Weaning failure or early reintubation are associated with increased morbidity and mortality, exposing patients to life-threatening complications. Cardiac dysfunction represents the most common cause of weaning failure. We conducted a systematic review and meta-analysis to evaluate the association between transthoracic echocardiographic parameters and weaning failure. METHODS: We performed a systematic search of MEDLINE and EMBASE screening for prospective studies providing echocardiographic data collected just before the beginning of spontaneous breathing trial and outcome of the weaning attempt. We primarily focused on parameters currently recommended for evaluation of left ventricular (LV) systolic or diastolic dysfunction. RESULTS: We included 11 studies in our primary analysis, which included data on LV ejection fraction (LVEF, n=10 studies) and parameters recommended for the assessment of LV diastolic function (E/e' ratio n=10; E/A ratio n=9; E wave n=8; and e' wave n=7). Weaning failure was significantly associated to a higher E/e' ratio (standardised mean difference [SMD]=1.70, 95% confidence interval [CI; 0.78-2.62]; P<0.001), lower e' wave (SMD=-1.22, 95% CI [-2.33 to -0.11]; P=0.03), and higher E wave (SMD=0.97, 95% CI [0.29-1.65]; P=0.005). We found no association between weaning failure and LVEF (SMD=-0.86, 95% CI [-1.92-0.20]; P=0.11) and E/A ratio (SMD=0.00, 95% CI [-0.30-0.31]; P=0.98). CONCLUSIONS: Weaning failure is associated with parameters indicating worse LV diastolic function (E/e', e' wave, E wave) and increased LV filling pressure (E/e' ratio). The association between weaning failure and LV systolic dysfunction as evaluated by LVEF is more unclear. More studies are needed to clarify this aspect and regarding the role of right ventricular function.