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Li J, Ma S, Chang X, Ju S, Zhang M, Yu D, Rong J. Effect of pressure-controlled ventilation-volume guaranteed mode combined with individualized positive end-expiratory pressure on respiratory mechanics, oxygenation and lung injury in patients undergoing laparoscopic surgery in Trendelenburg position. J Clin Monit Comput 2021; 36:1155-1164. [PMID: 34448089 PMCID: PMC9293798 DOI: 10.1007/s10877-021-00750-9] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/07/2021] [Accepted: 08/12/2021] [Indexed: 11/30/2022]
Abstract
The study aimed to investigate the efficacy of PCV-VG combined with individual PEEP during laparoscopic surgery in the Trendelenburg position. 120 patients were randomly divided into four groups: VF group (VCV plus 5cmH2O PEEP), PF group (PCV-VG plus 5cmH2O PEEP), VI group (VCV plus individual PEEP), and PI group (PCV-VG plus individual PEEP). Pmean, Ppeak, Cdyn, PaO2/FiO2, VD/VT, A-aDO2 and Qs/Qt were recorded at T1 (15 min after the induction of anesthesia), T2 (60 min after pneumoperitoneum), and T3 (5 min at the end of anesthesia). The CC16 and IL-6 were measured at T1 and T3. Our results showed that the Pmean was increased in VI and PI group, and the Ppeak was lower in PI group at T2. At T2 and T3, the Cdyn of PI group was higher than that in other groups, and PaO2/FiO2 was increased in PI group compared with VF and VI group. At T2 and T3, A-aDO2 of PI and PF group was reduced than that in other groups. The Qs/Qt was decreased in PI group compared with VF and VI group at T2 and T3. At T2, VD/VT in PI group was decreased than other groups. At T3, the concentration of CC16 in PI group was lower compared with other groups, and IL-6 level of PI group was decreased than that in VF and VI group. In conclusion, the patients who underwent laparoscopic surgery, PCV-VG combined with individual PEEP produced favorable lung mechanics and oxygenation, and thus reducing inflammatory response and lung injury. Clinical Trial registry: chictr.org. identifier: ChiCTR-2100044928
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Affiliation(s)
- Jianli Li
- Department of Anesthesiology, Hebei General Hospital, Shijiazhuang, 050051, China.
| | - Saixian Ma
- Department of Anesthesiology, Hebei General Hospital, Shijiazhuang, 050051, China
| | - Xiujie Chang
- Department of Anesthesiology, Hebei General Hospital, Shijiazhuang, 050051, China
| | - Songxu Ju
- Department of Anesthesiology, Hebei General Hospital, Shijiazhuang, 050051, China
| | - Meng Zhang
- Department of Anesthesiology, Hebei General Hospital, Shijiazhuang, 050051, China
| | - Dongdong Yu
- Department of Anesthesiology, Hebei General Hospital, Shijiazhuang, 050051, China
| | - Junfang Rong
- Department of Anesthesiology, Hebei General Hospital, Shijiazhuang, 050051, China
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Kim HY, Ham SY, Kim EJ, Yoon HJ, Choi SY, Koo BN. Effect of Equal Ratio Ventilation on Respiratory Mechanics and Oxygenation During Volume-Controlled Ventilation in Pediatric Patients. Yonsei Med J 2021; 62:503-509. [PMID: 34027637 PMCID: PMC8149927 DOI: 10.3349/ymj.2021.62.6.503] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/29/2021] [Revised: 03/15/2021] [Accepted: 03/16/2021] [Indexed: 11/27/2022] Open
Abstract
PURPOSE Children have few small alveoli, which reduce lung compliance; in contrast, their cartilaginous rib cage makes their chest wall highly compliant. This combination promotes lung collapse. Prolonged inspiratory to expiratory (I:E) ratio ventilation is used to optimize gas exchange and respiratory mechanics in surgery. However, the optimal ratio is unclear in children. We hypothesized that, compared to a 1:2 I:E ratio, a 1:1 I:E ratio would improve dynamic compliance and oxygenation, and affect the peak airway pressure in pediatric patients undergoing surgery. MATERIALS AND METHODS Forty-eight patients aged ≤6 years who were scheduled to undergo surgery under general anesthesia with an arterial line were randomly allocated to receive 1:1 (group 1:1) or 1:2 (group 1:2) I:E ratio ventilation. Airway pressure, respiratory system compliance, and arterial blood gas analyses were compared between groups immediately after induction (T0), 30 min after induction (T1), 60 min after induction (T2), immediately after surgery (T3), and on arrival at the post-anesthesia care unit (T4). RESULTS Peak and plateau airway pressures were significantly lower in group 1:1 than in group 1:2 at T1 (p=0.044 and 0.048, respectively). The dynamic and static compliances were significantly higher in group 1:1 than in group 1:2 at T1 (p=0.044 and 0.045, respectively). However, the partial pressure of oxygen did not significantly differ between groups. CONCLUSION Compared to a 1:2 I:E ratio, a 1:1 I:E ratio improved dynamic compliance and lowered the peak airway pressure without complications in pediatric patients. Nevertheless, our results do not support its use solely for improving oxygenation.
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Affiliation(s)
- Ha Yeon Kim
- Department of Anesthesiology and Pain Medicine, Ajou University School of Medicine, Suwon, Korea
| | - Sung Yeon Ham
- Department of Anesthesiology and Pain Medicine, Anesthesia and Pain Research Institute, Gangnam Severance Hospital, Yonsei University College of Medicine, Seoul, Korea
| | - Eun Jung Kim
- Department of Anesthesiology and Pain Medicine, Anesthesia and Pain Research Institute, Yonsei University College of Medicine, Seoul, Korea
| | - Hei Jin Yoon
- Department of Anesthesiology and Pain Medicine, Anesthesia and Pain Research Institute, Gangnam Severance Hospital, Yonsei University College of Medicine, Seoul, Korea
| | - Seung Yeon Choi
- Department of Anesthesiology and Pain Medicine, Anesthesia and Pain Research Institute, Yonsei University College of Medicine, Seoul, Korea
| | - Bon Nyeo Koo
- Department of Anesthesiology and Pain Medicine, Anesthesia and Pain Research Institute, Yonsei University College of Medicine, Seoul, Korea.
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Gad M, Gaballa K, Abdallah A, Abdelkhalek M, Zayed A, Nabil H. Pressure-Controlled Ventilation with Volume Guarantee Compared to Volume-Controlled Ventilation with Equal Ratio in Obese Patients Undergoing Laparoscopic Hysterectomy. Anesth Essays Res 2019; 13:347-353. [PMID: 31198258 PMCID: PMC6545942 DOI: 10.4103/aer.aer_82_19] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022] Open
Abstract
Background: Laparoscopic hysterectomy operations especially for obese patients necessitate Trendelenburg position and pneumoperitoneum with carbon dioxide, which could affect cardiac and pulmonary functions. The present study aimed to compare the impact of pressure-controlled ventilation with volume-guaranteed (PCV-VG) and volume-controlled ventilation (VCV) with equal ratio ventilation (ERV), i.e., I: E ratio of 1:1 on hemodynamics, respiratory mechanics, and oxygenation. Patients and Methods: Eighty females with body mass index (BMI) >30 kg/m2 and with physical status American Society of Anesthesiologists Classes I and II undergoing laparoscopic hysterectomy were allocated randomly to either PCV-VG (Group P) or VCV with ERV (Group V). The ventilation parameters, hemodynamics, and arterial blood gases (ABGs) analysis were recorded at four times: (T1): after the anesthetic induction while in supine position by 10 min, (T2 and T3): after the CO2 pneumoperitoneum and Trendelenburg positioning by 30 and 60 min, respectively, and (T4): after desufflation and resuming the supine position. Results: The peak inspiratory pressure in Group P recorded significant lower values than in Group V while the dynamic compliance was greater significantly in Group P than in Group V. No significant differences were reported as regards the ABG analysis, oxygenation, and hemodynamic data between both groups. Conclusion: In obese females undergoing laparoscopic hysterectomy surgeries, PCV-VG was superior to VCV with ERV as it provided higher dynamic compliance and lower peak inspiratory pressure that could be preferable, especially in those patients in whom cardiopulmonary function could be more susceptible to impairment.
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Affiliation(s)
- Mona Gad
- Department of Anesthesia and Surgical Intensive Care, Faculty of Medicine, Mansoura University, Mansoura, Egypt
| | - Khaled Gaballa
- Department of Surgical Oncology, Mansoura Oncology Center, Mansoura University, Mansoura, Egypt
| | - Ahmed Abdallah
- Department of Surgical Oncology, Mansoura Oncology Center, Mansoura University, Mansoura, Egypt
| | - Mohamed Abdelkhalek
- Department of Surgical Oncology, Mansoura Oncology Center, Mansoura University, Mansoura, Egypt
| | - Abdelhady Zayed
- Department of Obstetrics and Gynecology, Faculty of Medicine, Mansoura University, Mansoura, Egypt
| | - Hanan Nabil
- Department of Obstetrics and Gynecology, Faculty of Medicine, Mansoura University, Mansoura, Egypt
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Gao S, Zhang Z, Brunelli A, Chen C, Chen C, Chen G, Chen H, Chen JS, Cassivi S, Chai Y, Downs JB, Fang W, Fu X, Garutti MI, He J, He J, Hu J, Huang Y, Jiang G, Jiang H, Jiang Z, Li D, Li G, Li H, Li Q, Li X, Li Y, Li Z, Liu CC, Liu D, Liu L, Liu Y, Ma H, Mao W, Mao Y, Mou J, Ng CSH, Petersen RH, Qiao G, Rocco G, Ruffini E, Tan L, Tan Q, Tong T, Wang H, Wang Q, Wang R, Wang S, Xie D, Xue Q, Xue T, Xu L, Xu S, Xu S, Yan T, Yu F, Yu Z, Zhang C, Zhang L, Zhang T, Zhang X, Zhao X, Zhao X, Zhi X, Zhou Q. The Society for Translational Medicine: clinical practice guidelines for mechanical ventilation management for patients undergoing lobectomy. J Thorac Dis 2017; 9:3246-3254. [PMID: 29221302 PMCID: PMC5708473 DOI: 10.21037/jtd.2017.08.166] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Abstract
Patients undergoing lobectomy are at significantly increased risk of lung injury. One-lung ventilation is the most commonly used technique to maintain ventilation and oxygenation during the operation. It is a challenge to choose an appropriate mechanical ventilation strategy to minimize the lung injury and other adverse clinical outcomes. In order to understand the available evidence, a systematic review was conducted including the following topics: (I) protective ventilation (PV); (II) mode of mechanical ventilation [e.g., volume controlled (VCV) versus pressure controlled (PCV)]; (III) use of therapeutic hypercapnia; (IV) use of alveolar recruitment (open-lung) strategy; (V) pre-and post-operative application of positive end expiratory pressure (PEEP); (VI) Inspired Oxygen concentration; (VII) Non-intubated thoracoscopic lobectomy; and (VIII) adjuvant pharmacologic options. The recommendations of class II are non-intubated thoracoscopic lobectomy may be an alternative to conventional one-lung ventilation in selected patients. The recommendations of class IIa are: (I) Therapeutic hypercapnia to maintain a partial pressure of carbon dioxide at 50-70 mmHg is reasonable for patients undergoing pulmonary lobectomy with one-lung ventilation; (II) PV with a tidal volume of 6 mL/kg and PEEP of 5 cmH2O are reasonable methods, based on current evidence; (III) alveolar recruitment [open lung ventilation (OLV)] may be beneficial in patients undergoing lobectomy with one-lung ventilation; (IV) PCV is recommended over VCV for patients undergoing lung resection; (V) pre- and post-operative CPAP can improve short-term oxygenation in patients undergoing lobectomy with one-lung ventilation; (VI) controlled mechanical ventilation with I:E ratio of 1:1 is reasonable in patients undergoing one-lung ventilation; (VII) use of lowest inspired oxygen concentration to maintain satisfactory arterial oxygen saturation is reasonable based on physiologic principles; (VIII) Adjuvant drugs such as nebulized budesonide, intravenous sivelestat and ulinastatin are reasonable and can be used to attenuate inflammatory response.
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Affiliation(s)
- Shugeng Gao
- Department of Thoracic Surgical Oncology, Cancer Institute & Hospital, Chinese Academy of Medical Sciences and Peking Union Medical College, National Cancer Center, Beijing 100021, China
| | - Zhongheng Zhang
- Department of Emergency Medicine, Sir Run-Run Shaw Hospital, Zhejiang University School of Medicine, Hangzhou 310016, China
| | | | - Chang Chen
- Department of Thoracic Surgery, Shanghai Pulmonary Hospital, Shanghai 200433, China
| | - Chun Chen
- Department of Thoracic Surgery, Fujian Medical University Union Hospital, Fujian 350001, China
| | - Gang Chen
- Department of Thoracic Surgery, Guangdong General Hospital, Guangzhou 510080, China
| | | | - Jin-Shing Chen
- Department of Anesthesiology, National Taiwan University Hospital and National Taiwan University College of Medicine, Taipei 10002, Taiwan
| | | | - Ying Chai
- Second Affiliated Hospital, Medical College of Zhejiang University, Hangzhou 310009, China
| | - John B. Downs
- Department of Anesthesiology and Critical Care Medicine, University of Florida, Gainesville, FL, USA
| | - Wentao Fang
- Shanghai Chest Hospital, Shanghai 200030, China
| | - Xiangning Fu
- Department of Thoracic Surgery, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430030, China
| | - Martínez I. Garutti
- Department of Anaesthesia and Postoperative Care, Hospital General Universitario Gregorio Marañon, Madrid, Spain
| | - Jianxing He
- Department of Thoracic Surgery, The First Affiliated Hospital of Guangzhou Medical University, Guangzhou 510000, China
- Guangzhou Institute of Respiratory Disease & China State Key Laboratory of Respiratory Disease & National Clinical Research Center for Respiratory Disease, Guangzhou 510000, China
| | - Jie He
- Department of Thoracic Surgical Oncology, Cancer Institute & Hospital, Chinese Academy of Medical Sciences and Peking Union Medical College, National Cancer Center, Beijing 100021, China
| | - Jian Hu
- First Affiliated Hospital, Medical College of Zhejiang University, Hangzhou 310003, China
| | - Yunchao Huang
- Department of Thoracic Surgery, Yunnan Cancer Hospital, Kunming 650100, China
| | - Gening Jiang
- Department of Thoracic Surgery, Shanghai Pulmonary Hospital, Shanghai 200433, China
| | - Hongjing Jiang
- Department of Esophageal Oncology, Tianjin Medical University Cancer Institute and Hospital, Tianjin 300060, China
| | - Zhongmin Jiang
- Department of Thoracic Surgery, Shandong Qianfoshan Hospital, Jinan 250014, China
| | - Danqing Li
- Department of Thoracic Surgery, Peking Union Medical College Hospital, Beijing 100032, China
| | - Gaofeng Li
- Department of Thoracic Surgery, Yunnan Cancer Hospital, Kunming 650100, China
| | - Hui Li
- Department of Thoracic Surgery, Beijing Chaoyang Hospital, Beijing 100049, China
| | - Qiang Li
- Department of Thoracic Surgery, Sichuan Cancer Hospital and Institute, Chengdu 610041, China
| | - Xiaofei Li
- Department of Thoracic Surgery, Tangdu Hospital Fourth Military Medical University, Xi’an 710038, China
| | - Yin Li
- Department of Thoracic Surgery, Henan Cancer Hospital, Zhengzhou 450008, China
| | - Zhijun Li
- Department of Thoracic Surgery, Sir Run Run Shaw Hospital, Zhejiang University School of Medicine, Hangzhou 310016, China
| | - Chia-Chuan Liu
- Division of Thoracic Surgery, Department of Surgery, Sun Yat-Sen Cancer Center, Taipei, Taiwan
| | - Deruo Liu
- Department of Thoracic Surgery, China and Japan Friendship Hospital, Beijing 100029, China
| | - Lunxu Liu
- Department of Cardiovascular and Thoracic Surgery, West China Hospital, Sichuan University, Chengdu 610041, China
| | - Yongyi Liu
- Department of Thoracic Surgery, Liaoning Cancer Hospital and Institute, Shengyang 110042, China
| | - Haitao Ma
- Department of Thoracic Surgery, The First Hospital Affiliated to Soochow University, Suzhou 215000, China
| | - Weimin Mao
- Department of Thoracic Surgery, Zhejiang Cancer Hospital, Hangzhou 310000, China
| | - Yousheng Mao
- Department of Thoracic Surgical Oncology, Cancer Institute & Hospital, Chinese Academy of Medical Sciences and Peking Union Medical College, National Cancer Center, Beijing 100021, China
| | - Juwei Mou
- Department of Thoracic Surgical Oncology, Cancer Institute & Hospital, Chinese Academy of Medical Sciences and Peking Union Medical College, National Cancer Center, Beijing 100021, China
| | - Calvin Sze Hang Ng
- Department of Surgery, The Chinese University of Hong Kong, Prince of Wales Hospital, Shatin, N.T., Hong Kong, China
| | - René H. Petersen
- Department of Cardiothoracic Surgery, Rigshospitalet, Copenhagen, Denmark
| | - Guibin Qiao
- Department of Thoracic Surgery, Guangzhou General Hospital of Guangzhou Military Area Command, Guangzhou 510000, China
| | - Gaetano Rocco
- Department of Thoracic Surgery and Oncology, National Cancer Institute, Pascale Foundation, Naples, Italy
| | - Erico Ruffini
- Thoracic Surgery Unit, University of Torino, Torino, Italy
| | - Lijie Tan
- Department of Thoracic Surgery, Shanghai Zhongshan Hospital of Fudan University, Shanghai 200032, China
| | - Qunyou Tan
- Department of Thoracic Surgery, Daping Hospital, Research Institute of Surgery Third Military Medical University, Chongqing 400042, China
| | - Tang Tong
- Department of Thoracic Surgery, Second Affiliated Hospital of Jilin University, Changchun 130041, China
| | - Haidong Wang
- Department of Thoracic Surgery, Southwest Hospital, Third Millitary Medical University, Chongqing 400038, China
| | - Qun Wang
- Department of Thoracic Surgery, Shanghai Zhongshan Hospital of Fudan University, Shanghai 200032, China
| | - Ruwen Wang
- Department of Thoracic Surgery, Daping Hospital, Research Institute of Surgery Third Military Medical University, Chongqing 400042, China
| | - Shumin Wang
- Department of Thoracic Surgery, General Hospital of Shenyang Military Area, Shenyang 110015, China
| | - Deyao Xie
- Department of Cardiovascular and Thoracic Surgery, The First Affiliated Hospital of Wenzhou Medical University, Wenzhou 325000, China
| | - Qi Xue
- Department of Thoracic Surgical Oncology, Cancer Institute & Hospital, Chinese Academy of Medical Sciences and Peking Union Medical College, National Cancer Center, Beijing 100021, China
| | - Tao Xue
- Department of Thoracic Surgery, Zhongda Hospital Southeast University, Nanjing 210009, China
| | - Lin Xu
- Department of Thoracic Surgery, Jiangsu Cancer Hospital, Nanjing 210008, China
| | - Shidong Xu
- Department of Thoracic Surgery, Heilongjiang Cancer Hospital, Harbin 150049, China
| | - Songtao Xu
- Department of Thoracic Surgery, Shanghai Zhongshan Hospital of Fudan University, Shanghai 200032, China
| | - Tiansheng Yan
- Department of Thoracic Surgery, Peking University Third Hospital, Beijing 100083, China
| | - Fenglei Yu
- Department of Cardiovascular Surgery, Second Xiangya Hospital of Central South University, Changsha 410011, China
| | - Zhentao Yu
- Department of Esophageal Oncology, Tianjin Medical University Cancer Institute and Hospital, Tianjin 300060, China
| | - Chunfang Zhang
- Department of Thoracic Surgery, Xiangya Hospital, Central South University, Changsha 410008, China
| | - Lanjun Zhang
- Cancer Center, San Yat-sen University, Guangzhou 510060, China
| | - Tao Zhang
- Department of Thoracic Surgery, The First Affiliated Hospital of Xinjiang Medical University, Urumqi 830011, China
| | - Xun Zhang
- Department of Thoracic Surgery, Tanjin Chest Hospital, Tianjin 300300, China
| | - Xiaojing Zhao
- Department of Thoracic Surgery, Renji Hospital, Shanghai Jiaotong University School of Medicine, Shanghai 200000, China
| | - Xuewei Zhao
- Department of Thoracic Surgery, Shanghai Changzheng Hospital, Shanghai 200000, China
| | - Xiuyi Zhi
- Department of Thoracic Surgery, Xuanwu Hospital of Capital University of Medical Sciences, Beijing 100053, China
| | - Qinghua Zhou
- Department of Thoracic Surgery, Liaoning Cancer Hospital and Institute, Shengyang 110042, China
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Park JH, Lee JS, Lee JH, Shin S, Min NH, Kim MS. Effect of the Prolonged Inspiratory to Expiratory Ratio on Oxygenation and Respiratory Mechanics During Surgical Procedures. Medicine (Baltimore) 2016; 95:e3269. [PMID: 27043700 PMCID: PMC4998561 DOI: 10.1097/md.0000000000003269] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/25/2022] Open
Abstract
Prolonged inspiratory to expiratory (I:E) ratio ventilation has been researched to reduce lung injury and improve oxygenation in surgical patients with one-lung ventilation (OLV) or carbon dioxide (CO2) pneumoperitoneum. We aimed to confirm the efficacy of the 1:1 equal ratio ventilation (ERV) compared with the 1:2 conventional ratio ventilation (CRV) during surgical procedures. Electronic databases, including PubMed, Embase, Cochrane Central Register of Controlled Trials, Web of Science, and Google Scholar were searched.Prospective interventional trials that assessed the effects of prolonged I:E ratio of 1:1 during surgical procedures. Adult patients undergoing OLV or CO2 pneumoperitoneum as specific interventions depending on surgical procedures. The included studies were examined with the Cochrane Collaboration's tool. The data regarding intraoperative oxygenation and respiratory mechanics were extracted, and then pooled with standardized mean difference (SMD) using the method of Hedges. Seven trials (498 total patients, 274 with ERV) were included. From overall analysis, ERV did not improve oxygenation at 20 or 30 minutes after specific interventions (SMD 0.193, 95% confidence interval (CI): -0.094 to 0.481, P = 0.188). From subgroup analyses, ERV provided significantly improved oxygenation only with laparoscopy (SMD 0.425, 95% CI: 0.167-0.682, P = 0.001). At 60 minutes after the specific interventions, ERV improved oxygenation significantly in the overall analysis (SMD 0.447, 95% CI: 0.209-0.685, P < 0.001) as well as in the subgroup analyses with OLV (SMD 0.328, 95% CI: 0.011-0.644, P = 0.042) and laparoscopy (SMD 0.668, 95% CI: 0.052-1.285, P = 0.034). ERV provided lower peak airway pressure (Ppeak) and plateau airway pressure (Pplat) than CRV, regardless of the type of intervention. The relatively small number of the included articles and their heterogeneity could be the main limitations. ERV improved oxygenation at all of the assessment points during laparoscopy. In OLV, oxygenation improvement with ERV was observed 1 hour after application. ERV could be beneficial to reduce the Ppeak and Pplat.
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Affiliation(s)
- Jin Ha Park
- From the Department of Anesthesiology and Pain Medicine (JHP, JSL, JHL, SS, NHM, M-SK); Anesthesia and Pain Research Institute (JHP, JSL, JHL, SS, MSK), Yonsei University College of Medicine, Seodaemun-gu, Seoul, Republic of Korea
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