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Zhang Y, Dai Q, Xu K, Fu H, Zhang A, Du W. Predictors and influence of postoperative moderate-to-severe pain of PACU in the patients with malignancy. BMC Anesthesiol 2024; 24:81. [PMID: 38413909 PMCID: PMC10898113 DOI: 10.1186/s12871-024-02464-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/20/2023] [Accepted: 02/19/2024] [Indexed: 02/29/2024] Open
Abstract
BACKGROUND This study was identified the risk factors for and designed to investigate influence of postoperative moderate-to-severe pain of post anaesthesia care unit (PACU) in patients with malignancy. METHODS A retrospective study was performed on 22,600 cancer patients with malignancy who underwent elective radical surgery in the new hospital of First Affiliated Hospital of Wenzhou Medical University, between January 2016 and June 2021. All patients were transferred to the PACU after tracheal extubation. Patients were divided into two groups according to a visual analogue scale (VAS) score of > 3: the no-moderate-severe-pain group and moderate-to-severe-pain group. Data pertaining to demographic, surgical, anaesthetic, and other factors were recorded. Lasso and logistic regression analysis was performed to explore the risk factors, then a nomogram was constructed to predict the moderate-severe-pain in the PACU. Validation was performed by using another 662 cancer patients in old hospital. The ROC curves and calibration curve were used to evaluate the accuracy and predictive ability of the nomogram. RESULTS The incidence of postoperative moderate-to-severe pain of PACU in patients with malignancy was 1.42%. Gender, type of surgery, postoperative use of PCA, intraoperative adjuvant opioid agonists, NSAIDS, epidural analgesia, duration of anaesthesia, intraoperative massive haemorrhage, PACU vomiting were independent predictors for postoperative moderate-to-severe pain of PACU in the patients with malignancy. The area under the ROC curve of the predictive models in the primary and validation groups were 0.817 and 0.786, respectively. Moderate-to-severe pain in the PACU correlated with hypertension, hyperglycaemia, agitation, and hypoxemia (P < 0.05). CONCLUSIONS The prediction model for postoperative moderate-to-severe pain of PACU in patients with malignancy has good predictive ability and high accuracy, which is helpful for PACU medical staff to identify and prevent postoperative moderate-to-severe pain in advance. TRIAL REGISTRATION The study was approved by the Clinical Research Ethics Committee of the First Affiliated Hospital of Wenzhou Medical University (No.KY2021-097) and registered in the Chictr.org.cn registration system on 06/12/2021 (ChiCTR2100054013).
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Affiliation(s)
- Yu Zhang
- Departments of Anesthesiology, The First Affiliated Hospital of Wenzhou Medical University, Ouhai District, Wenzhou, Zhejiang, P.R. China
| | - Qinxue Dai
- Departments of Anesthesiology, The First Affiliated Hospital of Wenzhou Medical University, Ouhai District, Wenzhou, Zhejiang, P.R. China
| | - Kaiwei Xu
- Departments of Anesthesiology, The First Affiliated Hospital of Wenzhou Medical University, Ouhai District, Wenzhou, Zhejiang, P.R. China
| | - Haifeng Fu
- Departments of Anesthesiology, The First Affiliated Hospital of Wenzhou Medical University, Ouhai District, Wenzhou, Zhejiang, P.R. China
| | - Anqi Zhang
- Departments of Anesthesiology, The First Affiliated Hospital of Wenzhou Medical University, Ouhai District, Wenzhou, Zhejiang, P.R. China
| | - Wenwen Du
- Departments of Anesthesiology, The First Affiliated Hospital of Wenzhou Medical University, Ouhai District, Wenzhou, Zhejiang, P.R. China.
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Liu A, Shi Y. Analysis of Adverse Events in the Postanesthesia Unit at a Tertiary Pediatric Hospital. J Perianesth Nurs 2024:S1089-9472(23)01068-7. [PMID: 38416105 DOI: 10.1016/j.jopan.2023.12.003] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/16/2023] [Revised: 11/13/2023] [Accepted: 12/02/2023] [Indexed: 02/29/2024]
Abstract
PURPOSE The postanesthesia care unit (PACU) is an indispensable part of modern medicine which provides critical care to patients to ensure safe and smooth emergence from anesthesia. The adverse events in the PACU have been widely investigated in adults. However, little is known about the adverse events in pediatric populations. This study was designed to investigate adverse events, including the incidence, disease spectrum, and possible risk factors, in pediatric patients in the PACU at a tertiary pediatric hospital. DESIGN This is a retrospective observational study. METHODS Children admitted to the PACU at the Children's Hospital of Fudan University from September 2021 to August 2022 were included in the study. The following adverse events were recorded: hypothermia, fever, adverse airway events, hypotension, hypertension, prolonged length of stay in PACU, pain, reintubation, neurological events, unplanned admission to the intensive care unit, arrhythmia, water-electrolyte imbalance, and bleeding requiring medical intervention. Descriptive analyses, t tests, and χ2 tests were performed. FINDINGS A total of 16,012 children were included in the study, and 305 adverse events occurred in 237 (1.48%) children. The three most frequently occurring adverse events were prolonged stay in the PACU (8.4%), adverse airway events (5.6%), and abnormal temperature (2.7%). Age, American Society of Anesthesiologists' grade, and general surgery were independent risk factors of both overall adverse events and prolonged stay in the PACU in multivariate logistic regression analysis. Children with adverse events stayed in the PACU significantly longer than those without adverse events (60.04 ± 1.01 vs 95.8 ± 47.25 minutes, P < .05). Compared with the other surgeries, a significantly higher proportion of severe pain (37.5% vs 0%) after thoracic surgery, prolonged stay in the PACU (52.9% vs 36.4%) after general surgery, and neurological events (14.7% vs 0%) after neurological surgery was detected, while a significantly lower proportion of adverse airway events after general surgery (21.1% vs 43%) and neurological surgery (8.8% vs 43%) was detected, respectively. CONCLUSIONS Our study reports the current incidence and spectrum of adverse events in the PACU at a tertiary pediatric hospital. Patients with young age, high American Society of Anesthesiologists' grade, and those from the general surgery department are at a significantly increased risk of adverse events in the PACU. Significant differences were detected in the proportion of specific adverse events after specific surgeries.
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Affiliation(s)
- Aihua Liu
- Department of anesthesia, Post anesthesia care unit, Children's Hospital of Fudan University, Shanghai, China
| | - Yun Shi
- Department of anesthesia, Children's Hospital of Fudan University, Shanghai, China.
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Liu S, Dong Y, Wan L, Luo A, Chen H, Xu H. Incidence and Outcome of Reintubation in the Postanesthesia Care Unit: A Single-Center, Retrospective, Observational Matched Cohort Study in China. J Perianesth Nurs 2023; 38:912-917.e1. [PMID: 37656106 DOI: 10.1016/j.jopan.2023.03.004] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/25/2022] [Revised: 01/31/2023] [Accepted: 03/11/2023] [Indexed: 09/02/2023]
Abstract
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.
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Affiliation(s)
- Shangkun Liu
- Department of Anesthesiology, Hubei Key Laboratory of Geriatric Anesthesia and Perioperative Brain Health, and Wuhan Clinical Research Center for Geriatric Anesthesia, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China; Department of Nursing, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
| | - Ying Dong
- Department of Anesthesiology, Hubei Key Laboratory of Geriatric Anesthesia and Perioperative Brain Health, and Wuhan Clinical Research Center for Geriatric Anesthesia, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China; Department of Nursing, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
| | - Li Wan
- Department of Anesthesiology, Hubei Key Laboratory of Geriatric Anesthesia and Perioperative Brain Health, and Wuhan Clinical Research Center for Geriatric Anesthesia, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
| | - Ailin Luo
- Department of Anesthesiology, Hubei Key Laboratory of Geriatric Anesthesia and Perioperative Brain Health, and Wuhan Clinical Research Center for Geriatric Anesthesia, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
| | - Hong Chen
- Department of Nursing, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
| | - Hui Xu
- Department of Anesthesiology, Hubei Key Laboratory of Geriatric Anesthesia and Perioperative Brain Health, and Wuhan Clinical Research Center for Geriatric Anesthesia, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China.
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Thy SA, Johansen AO, Thy A, Sørensen HH, Mølgaard J, Foss NB, Toft P, Meyhoff CS, Aasvang EK. Associations between clinical interventions and transcutaneous blood gas values in postoperative patients. J Clin Monit Comput 2023; 37:1255-1264. [PMID: 36808596 DOI: 10.1007/s10877-023-00982-x] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/15/2022] [Accepted: 01/29/2023] [Indexed: 02/21/2023]
Abstract
PURPOSE Postoperative monitoring of circulation and respiration is pivotal to guide intervention strategies and ensure patient outcomes. Transcutaneous blood gas monitoring (TCM) may allow for noninvasive assessment of changes in cardiopulmonary function after surgery, including a more direct assessment of local micro-perfusion and metabolism. To form the basis for studies assessing the clinical impact of TCM complication detection and goal-directed-therapy, we examined the association between clinical interventions in the postoperative period and changes in transcutaneous blood gasses. METHODS Two-hundred adult patients who have had major surgery were enrolled prospectively and monitored with transcutaneous blood gas measurements (oxygen (TcPO2) and carbon dioxide (TcPCO2)) for 2 h in the post anaesthesia care unit, with recording of all clinical interventions. The primary outcome was changes in TcPO2, secondarily TcPCO2, from 5 min before a clinical intervention versus 5 min after, analysed with paired t-test. RESULTS Data from 190 patients with 686 interventions were analysed. During clinical interventions, a mean change in TcPO2 of 0.99 mmHg (95% CI-1.79-0.2, p = 0.015) and TcPCO2 of-0.67 mmHg (95% CI 0.36-0.98, p < 0.001) was detected. CONCLUSION Clinical interventions resulted in significant changes in transcutaneous oxygen and carbon dioxide. These findings suggest future studies to assess the clinical value of changes in transcutaneous PO2 and PCO2 in a postoperative setting. TRIAL REGISTRY Clinical trial number: NCT04735380. CLINICAL TRIAL REGISTRY https://clinicaltrials.gov/ct2/show/NCT04735380.
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Affiliation(s)
- Sandra A Thy
- Department of Anesthesiology, Center for Cancer and Organ Dysfunction, Copenhagen University Hospital-Rigshospitalet, Blegdamsvej 9, 2100, Copenhagen, Denmark.
- Department of Anesthesiology, Odense University Hospital and Faculty of Health Science, University of Southern Denmark, Odense, Denmark.
| | - Andreas O Johansen
- Department of Anaesthesia and Intensive Care, Copenhagen University Hospital-Bispebjerg and Frederiksberg, Copenhagen, Denmark
| | - André Thy
- Department of Anesthesiology, Center for Cancer and Organ Dysfunction, Copenhagen University Hospital-Rigshospitalet, Blegdamsvej 9, 2100, Copenhagen, Denmark
| | - Henrik H Sørensen
- Department of Anesthesiology, Center for Cancer and Organ Dysfunction, Copenhagen University Hospital-Rigshospitalet, Blegdamsvej 9, 2100, Copenhagen, Denmark
| | - Jesper Mølgaard
- Department of Anesthesiology, Center for Cancer and Organ Dysfunction, Copenhagen University Hospital-Rigshospitalet, Blegdamsvej 9, 2100, Copenhagen, Denmark
| | - Nicolai B Foss
- Department of Anesthesia and Intensive Care, Copenhagen University Hospital-Amager and Hvidovre, Copenhagen, Denmark
- Department of Clinical Medicine, University of Copenhagen, Copenhagen, Denmark
| | - Palle Toft
- Department of Anesthesiology, Odense University Hospital and Faculty of Health Science, University of Southern Denmark, Odense, Denmark
| | - Christian S Meyhoff
- Department of Anaesthesia and Intensive Care, Copenhagen University Hospital-Bispebjerg and Frederiksberg, Copenhagen, Denmark
- Department of Clinical Medicine, University of Copenhagen, Copenhagen, Denmark
| | - Eske K Aasvang
- Department of Anesthesiology, Center for Cancer and Organ Dysfunction, Copenhagen University Hospital-Rigshospitalet, Blegdamsvej 9, 2100, Copenhagen, Denmark
- Department of Clinical Medicine, University of Copenhagen, Copenhagen, Denmark
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Li H, Zhang Y, Cai J, Wang H, Wei R. Risk Factors of Hypoxemia in the Postanesthesia Care Unit After General Anesthesia in Children. J Perianesth Nurs 2023; 38:799-803. [PMID: 37330722 DOI: 10.1016/j.jopan.2023.02.003] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/18/2022] [Revised: 01/26/2023] [Accepted: 02/03/2023] [Indexed: 06/19/2023]
Abstract
PURPOSE To investigate the incidence and risk factors of hypoxemia in the postanesthesia care unit (PACU) after general anesthesia in children. DESIGN A retrospective observational study. METHODS Elective surgical patients (N = 3,840 patients) treated in a pediatric hospital were divided into a hypoxemia group and a nonhypoxemia group according to the presence of hypoxemia following transport to the PACU. The clinical data of the 3,840 patients were compared between these two groups to evaluate factors that were linked to the development of postoperative hypoxemia. Factors that showed a statistically significant difference (P < .05) in single-factor tests were then examined in multivariate regression analyses to identify hypoxemia risk factors. FINDINGS In our study group of 3,840 patients, 167 (4.35%) patients developed hypoxemia, with an incidence of 4.35%. Univariate analysis indicated that age, weight, anesthesia method, and operation type were significantly associated with hypoxemia. Logistic regression analysis indicated that operation type was associated with hypoxemia. CONCLUSIONS Surgery type is a primary risk factor for pediatric hypoxemia in the PACU following general anesthesia. Patients undergoing oral surgery are more prone to hypoxemia and should be more intensively monitored to ensure timely treatment if required.
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Affiliation(s)
- Hongyun Li
- Department of Anesthesiology, Shanghai Children's Hospital, School of Medicine, Shanghai Jiao Tong University, Shanghai, China
| | - Yuting Zhang
- Department of Anesthesiology, Shanghai Children's Hospital, School of Medicine, Shanghai Jiao Tong University, Shanghai, China
| | - Jingjie Cai
- Department of Anesthesiology, Shanghai Children's Hospital, School of Medicine, Shanghai Jiao Tong University, Shanghai, China
| | - Hui Wang
- Department of Anesthesiology, Shanghai Children's Hospital, School of Medicine, Shanghai Jiao Tong University, Shanghai, China
| | - Rong Wei
- Department of Anesthesiology, Shanghai Children's Hospital, School of Medicine, Shanghai Jiao Tong University, Shanghai, China.
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Hung KC, Huang YT, Kuo JR, Hsu CW, Yew M, Chen JY, Lin MC, Chen IW, Sun CK. Elevated Surgical Pleth Index at the End of Surgery Is Associated with Postoperative Moderate-to-Severe Pain: A Systematic Review and Meta-Analysis. Diagnostics (Basel) 2022; 12:diagnostics12092167. [PMID: 36140567 PMCID: PMC9498235 DOI: 10.3390/diagnostics12092167] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/19/2022] [Revised: 09/02/2022] [Accepted: 09/03/2022] [Indexed: 11/16/2022] Open
Abstract
Despite acceptance of the surgical pleth index (SPI) for monitoring the intraoperative balance between noxious stimulation and anti-nociception under general anesthesia, its efficacy for predicting postoperative moderate-to-severe pain remains unclear. We searched electronic databases (e.g., Google Scholar, MEDLINE, Cochrane Library, and EMBASE) to identify articles focusing on associations of SPI at the end of surgery with immediate moderate-to-severe pain in the postanesthesia care unit from inception to 7 July 2022. A total of six observational studies involving 756 adults published between 2016 and 2020 were eligible for quantitative syntheses. Pooled results revealed higher values of SPI in patients with moderate-to-severe pain than those without (mean difference: 7.82, 95% CI: 3.69 to 11.95, p = 0.002, I2 = 46%). In addition, an elevated SPI at the end of surgery was able to predict moderate-to-severe pain with a sensitivity of 0.71 (95% confidence interval (CI): 0.65–0.77; I2 = 29.01%) and a specificity of 0.58 (95% CI: 0.39–0.74; I2 = 79.31%). The overall accuracy based on the summary receiver operating characteristic (sROC) curve was 0.72. In conclusion, this meta-analysis highlighted the feasibility of the surgical pleth index to predict postoperative moderate-to-severe pain immediately after surgery. Our results from a limited number of studies warrant further investigations for verification.
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Affiliation(s)
- Kuo-Chuan Hung
- Department of Anesthesiology, Chi Mei Medical Center, Tainan City 71004, Taiwan
- Department of Hospital and Health Care Administration, College of Recreation and Health Management, Chia Nan University of Pharmacy and Science, Tainan City 71710, Taiwan
| | - Yen-Ta Huang
- Department of Surgery, National Cheng Kung University Hospital, College of Medicine, National Cheng Kung University, Tainan City 70101, Taiwan
| | - Jinn-Rung Kuo
- Department of Neurosurgery, Chi Mei Medical Center, Tainan City 71004, Taiwan
- Department of Medical Research, Chi Mei Medical Center, Tainan City 71004, Taiwan
| | - Chih-Wei Hsu
- Department of Psychiatry, Kaohsiung Chang Gung Memorial Hospital and Chang Gung University College of Medicine, Kaohsiung City 83301, Taiwan
| | - Ming Yew
- Department of Anesthesiology, Chi Mei Medical Center, Tainan City 71004, Taiwan
| | - Jen-Yin Chen
- Department of Anesthesiology, Chi Mei Medical Center, Tainan City 71004, Taiwan
| | - Ming-Chung Lin
- Department of Anesthesiology, Chi Mei Medical Center, Tainan City 71004, Taiwan
| | - I-Wen Chen
- Department of Anesthesiology, Chi Mei Medical Center, Liouying, Tainan City 73657, Taiwan
- Correspondence: (I.-W.C.); (C.-K.S.)
| | - Cheuk-Kwan Sun
- Department of Emergency Medicine, E-Da Hospital, Kaohsiung City 82445, Taiwan
- College of Medicine, I-Shou University, Kaohsiung City 84001, Taiwan
- Correspondence: (I.-W.C.); (C.-K.S.)
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Sugiyama D, Dexter F, Thenuwara K, Ueda K. Comparison of Percentage Prolonged Times to Tracheal Extubation Between a Japanese Teaching Hospital and One in the United States, Without and With a Phase I Postanesthesia Care Unit. Anesth Analg 2020; 133:1206-1214. [PMID: 33044261 DOI: 10.1213/ane.0000000000005231] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
BACKGROUND Prolonged times to tracheal extubation are those from end of surgery (dressing on the patient) to extubation 15 minutes or longer. They are so long that others in the operating room (OR) generally have exhausted whatever activities can be done. They cause delays in the starts of surgeons' to-follow cases and are associated with longer duration workdays. Anesthesiologists rate them as being inferior quality. We compare prolonged times to extubation between a teaching hospital in the United States with a phase I postanesthesia care unit (PACU) and a teaching hospital in Japan without a PACU. Our report is especially important during the coronavirus disease 2019 (COVID-19) pandemic. Anesthesiologists with some patients undergoing general anesthetics and having initial PACU recovery in the ORs where they had surgery can learn from the Japanese anesthesiologists with all patients recovering in ORs. METHODS The historical cohort study included all patients undergoing gynecological surgery at a US hospital (N = 785) or Japanese hospital (N = 699), with the time from OR entrance to end of surgery of at least 4 hours. RESULTS The mean times from end of surgery to OR exit were slightly longer at the US hospital than at the Japanese hospital (mean difference 1.9 minutes, P < .0001). The mean from end of surgery to discharge to surgical ward at the US hospital also was longer (P < .0001), mean difference 2.2 hours. The sample standard deviations of times from end of surgery until tracheal extubation was 40 minutes for the US hospital versus 4 minutes at the Japanese hospital (P < .0001). Prolonged times to tracheal extubation were 39% of cases at the US hospital versus 6% at the Japanese hospital; relative risk 6.40, 99% confidence interval (CI), 4.28-9.56. Neither patient demographics, case characteristics, surgeon, anesthesiologist, nor anesthesia provider significantly revised the risk ratio. There were 39% of times to extubation that were prolonged among the patients receiving neither remifentanil nor desflurane (all such patients at the US hospital) versus 6% among the patients receiving both remifentanil and desflurane (all at the Japanese hospital). The relative risk 7.12 (99% CI, 4.59-11.05) was similar to that for the hospital groups. CONCLUSIONS Differences in anesthetic practice can facilitate major differences in patient recovery soon after anesthesia, useful when the patient will recover initially in the OR or if the phase I PACU is expected to be unable to admit the patient.
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Affiliation(s)
- Daisuke Sugiyama
- From the Department of Anesthesiology, Kameda Medical Center, Chiba, Japan
| | - Franklin Dexter
- Division of Management Consulting, Department of Anesthesia, University of Iowa, Iowa City, Iowa
| | - Kokila Thenuwara
- Division of Management Consulting, Department of Anesthesia, University of Iowa, Iowa City, Iowa
| | - Kenichi Ueda
- From the Department of Anesthesiology, Kameda Medical Center, Chiba, Japan.,Department of Anesthesia, University of Iowa, Iowa City, Iowa
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