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Djukanovic M, Skrobic O, Stojakov D, Knezevic NN, Milicic B, Sabljak P, Simic A, Milenkovic M, Sreckovic S, Markovic D, Palibrk I. Impact of fluid balance and opioid-sparing anesthesia within enchanced recovery pathway on postoperative morbidity after transthoracic esophagectomy for cancer. Front Med (Lausanne) 2024; 11:1366438. [PMID: 38770049 PMCID: PMC11102964 DOI: 10.3389/fmed.2024.1366438] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/06/2024] [Accepted: 04/15/2024] [Indexed: 05/22/2024] Open
Abstract
BackgroundEnhanced Recovery After Surgery (ERAS) protocol for esophagectomy may reduce the high incidence of postoperative morbidity and mortality. The aim of this study was to assess the impact of properly conducted ERAS protocol with specific emphasis on fluid balance and opioid-sparing anesthesia (OSA) on postoperative major morbidity and mortality after esophagectomy.MethodsPatients undergoing elective esophagectomy for esophageal cancer at the Hospital for Digestive Surgery, University Clinical Center of Serbia, from December 2017 to March 2021, were included in this retrospective observational study. Patients were divided into two groups: the ERAS group (OSA, intraoperative goal-directed therapy, and postoperative “near-zero” fluid balance) and the control group (opioid-based anesthesia, maintenance mean blood pressure ≥ 65 mmHg, and liberal postoperative fluid management). The primary outcome was major morbidity within 30 days from surgery and 30-day and 90-day mortality. Multivariable analysis was used to examine the effect of the ERAS protocol.ResultsA total of 121 patients were divided into the ERAS group (69 patients) and the control group (52 patients). Patients in the ERAS group was received less fentanyl, median 300 (interquartile range (IQR), 200–1,550) mcg than in control group, median 1,100 (IQR, 650–1750) mcg, p < 0.001. Median intraoperative total infusion was lower in the ERAS group, 2000 (IQR, 1000–3,750) mL compared to control group, 3,500 (IQR, 2000–5,500) mL, p < 0.001. However, intraoperative norepinephrine infusion was more administered in the ERAS group (52.2% vs. 7.7%, p < 0.001). On postoperative day 1, median cumulative fluid balance was 2,215 (IQR, −150-5880) mL in the ERAS group vs. 4692.5 (IQR, 1770–10,060) mL in the control group, p = 0.002. After the implementation of the ERAS protocol, major morbidity was less frequent in the ERAS group than in the control group (18.8% vs. 75%, p < 0.001). There was no statistical significant difference in 30-day and 90-day mortality (p = 0.07 and p = 0.119, respectively). The probability of postoperative major morbidity and interstitial pulmonary edema were higher in control group (OR 5.637; CI95%:1.178–10.98; p = 0.030 and OR 5.955; CI95% 1.702–9.084; p < 0.001, respectively).ConclusionA major morbidity and interstitial pulmonary edema after esophagectomy were decreased after the implementation of the ERAS protocol, without impact on overall mortality.
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Affiliation(s)
- Marija Djukanovic
- School of Medicine, University of Belgrade, Belgrade, Serbia
- Department of Anaesthesiology and Intensive Care, Hospital for Digestive Surgery, University Clinical Center of Serbia, Belgrade, Serbia
| | - Ognjan Skrobic
- School of Medicine, University of Belgrade, Belgrade, Serbia
- Department of Esophagogastric Surgery, Hospital for Digestive Surgery, University Clinical Center of Serbia, Belgrade, Serbia
| | - Dejan Stojakov
- School of Medicine, University of Belgrade, Belgrade, Serbia
- Surgery Clinic, Clinical Centre “Dr. Dragisa Misovic – Dedinje”, Belgrade, Serbia
| | - Nebojsa Nick Knezevic
- Department of Anaesthesiology, Advocate Illinois Masonic Medical Center, Chicago, IL, United States
- Department of Anaesthesiology, College of Medicine, University of Illinois, Chicago, IL, United States
- Department of Surgery, College of Medicine, University of Illinois, Chicago, IL, United States
| | - Biljana Milicic
- Department of Medical Statistics and Informatics, School of Dental Medicine, University of Belgrade, Belgrade, Serbia
| | - Predrag Sabljak
- School of Medicine, University of Belgrade, Belgrade, Serbia
- Department of Esophagogastric Surgery, Hospital for Digestive Surgery, University Clinical Center of Serbia, Belgrade, Serbia
| | - Aleksandar Simic
- School of Medicine, University of Belgrade, Belgrade, Serbia
- Department of Esophagogastric Surgery, Hospital for Digestive Surgery, University Clinical Center of Serbia, Belgrade, Serbia
| | - Marija Milenkovic
- School of Medicine, University of Belgrade, Belgrade, Serbia
- Department of Anaesthesiology, Emergency Center, University Clinical Center of Serbia, Belgrade, Serbia
| | - Svetlana Sreckovic
- School of Medicine, University of Belgrade, Belgrade, Serbia
- Department of Anesthesiology, Clinic for Orthopedics Surgery and Traumatology, University Clinical Center of Serbia, Belgrade, Serbia
| | - Dejan Markovic
- School of Medicine, University of Belgrade, Belgrade, Serbia
- Department of Cardiac Anesthesiology, Hospital of Cardiovascular Surgery, University Clinical Center of Serbia, Belgrade, Serbia
| | - Ivan Palibrk
- School of Medicine, University of Belgrade, Belgrade, Serbia
- Department of Anaesthesiology and Intensive Care, Hospital for Digestive Surgery, University Clinical Center of Serbia, Belgrade, Serbia
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Takahashi M, Toyama H, Takahashi K, Kaiho Y, Ejima Y, Yamauchi M. Impact of intraoperative fluid management on postoperative complications in patients undergoing minimally invasive esophagectomy for esophageal cancer: a retrospective single-center study. BMC Anesthesiol 2024; 24:29. [PMID: 38238681 PMCID: PMC10795296 DOI: 10.1186/s12871-024-02410-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/30/2023] [Accepted: 01/10/2024] [Indexed: 01/22/2024] Open
Abstract
BACKGROUND Esophagectomy is a high-risk procedure that can involve serious postoperative complications. There has been an increase in the number of minimally invasive esophagectomies (MIEs) being performed. However, the relationship between intraoperative management and postoperative complications in MIE remains unclear. METHODS After the institutional review board approval, we enrolled 300 patients who underwent MIE at Tohoku University Hospital between April 2016 and March 2021. The relationships among patient characteristics, intraoperative and perioperative factors, and postoperative complications were retrospectively analyzed. The primary outcome was the relationship between intraoperative fluid volume and anastomotic leakage, and the secondary outcomes included the associations between other perioperative factors and postoperative complications. RESULTS Among 300 patients, 28 were excluded because of missing data; accordingly, 272 patients were included in the final analysis. The median [interquartile range] operative duration was 599 [545-682] minutes; total intraoperative infusion volume was 3,747 [3,038-4,399] mL; total infusion volume per body weight per hour was 5.48 [4.42-6.73] mL/kg/h; and fluid balance was + 2,648 [2,015-3,263] mL. The postoperative complications included anastomotic leakage in 68 (25%) patients, recurrent nerve palsy in 91 (33%) patients, pneumonia in 62 (23%) patients, cardiac arrhythmia in 13 (5%) patients, acute kidney injury in 5 (2%) patients, and heart failure in 5 (2%) patients. The Cochrane-Armitage trend test indicated significantly increased anastomotic leakage among patients with a relatively high total infusion volume (P = 0.0085). Moreover, anastomotic leakage was associated with male sex but not with peak serum lactate levels. Patients with a longer anesthesia duration or recurrent nerve palsy had a significantly higher incidence of postoperative pneumonia than those without. Further, the incidence of postoperative pneumonia was not associated with the operative duration, total infusion volume, or fluid balance. The operative duration and blood loss were related to the total infusion volume. Acute kidney injury was not associated with the total infusion volume or serum lactate levels. CONCLUSIONS Among patients who underwent MIE, the total infusion volume was positively correlated with the incidence of anastomotic leakage. Further, postoperative pneumonia was associated with recurrent nerve palsy but not total infusion volume or fluid balance.
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Affiliation(s)
- Misaki Takahashi
- Department of Anesthesiology and Perioperative Medicine, Tohoku University Graduate School of Medicine, 1-1 Seiryo-machi, Aoba-ku, Sendai, 980-8574, Japan
| | - Hiroaki Toyama
- Department of Anesthesiology and Perioperative Medicine, Tohoku University Graduate School of Medicine, 1-1 Seiryo-machi, Aoba-ku, Sendai, 980-8574, Japan.
| | - Kazuhiro Takahashi
- Department of Anesthesiology and Perioperative Medicine, Tohoku University Graduate School of Medicine, 1-1 Seiryo-machi, Aoba-ku, Sendai, 980-8574, Japan
| | - Yu Kaiho
- Department of Anesthesiology and Perioperative Medicine, Tohoku University Graduate School of Medicine, 1-1 Seiryo-machi, Aoba-ku, Sendai, 980-8574, Japan
| | - Yutaka Ejima
- Department of Surgical Center and Supply, Sterilization, Tohoku University Hospital, 1-1 Seiryo-machi, Aoba-ku, Sendai, 980-8574, Japan
| | - Masanori Yamauchi
- Department of Anesthesiology and Perioperative Medicine, Tohoku University Graduate School of Medicine, 1-1 Seiryo-machi, Aoba-ku, Sendai, 980-8574, Japan
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Turi S, Marmiere M, Beretta L. Dry or wet? Fluid therapy in upper gastrointestinal surgery patients. Updates Surg 2023; 75:325-328. [PMID: 35945475 DOI: 10.1007/s13304-022-01352-z] [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: 04/03/2022] [Accepted: 08/01/2022] [Indexed: 01/24/2023]
Abstract
A correct perioperative fluid administration represents one of the most important items proposed by the Enhanced Recovery After Surgery Society. Upper gastrointestinal (UGI) surgery patients undergoing major oncological procedures are often elderly and frail. Should we prefer a wet or a dry patient? Both conditions should probably be avoided in this surgical setting. We present a narrative review on perioperative fluid administration in UGI patients undergoing major surgery, also analyzing the role of Goal Directed therapy.
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Affiliation(s)
- S Turi
- Department of Anesthesia and Intensive Care, IRCCS San Raffaele Scientific Institute, Milan, Italy.
| | - M Marmiere
- Department of Anesthesia and Intensive Care, IRCCS San Raffaele Scientific Institute, Milan, Italy
| | - L Beretta
- Department of Anesthesia and Intensive Care, IRCCS San Raffaele Scientific Institute, Milan, Italy
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Fumagalli Romario U, de Pascale S, Colombo S, Attanasio A, Sabbatini A, Sandrin F. Esophagectomy-prevention of complications-tips and tricks for the preoperative, intraoperative and postoperative stage. Updates Surg 2023; 75:343-355. [PMID: 35851675 DOI: 10.1007/s13304-022-01332-3] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/19/2022] [Accepted: 07/06/2022] [Indexed: 01/24/2023]
Abstract
Esophagectomy still remains the mainstay of treatment for localized esophageal cancer. Many progresses have been made in the technique of esophagectomy in the last decades but the overall morbidity for this operation remains formidable. Postoperative complication and mortality rate after esophagectomy are significant; anastomotic leak has an incidence of 11,4%. The occurrence of a complication is a significant negative prognostic factor for long term survival and is also linked to longer postoperative stay, a lower quality of life, increased hospital costs. Preventing the occurrence of postoperative morbidity and reducing associated postoperative mortality rate is a major goal for surgeons experienced in resective esophageal surgery. Many details of pre, intra and postoperative care for patients undergoing esophagectomy need to be shared among the professionals taking care of these patients (oncologists, dieticians, physiotherapists, surgeons, nurses, anesthesiologists, gastroenterologists) in order to improve the short and long term clinical results.
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The impact of nitroglycerine and volume on gastric tube microperfusion assessed by indocyanine green fluorescence imaging. Sci Rep 2022; 12:22394. [PMID: 36575280 PMCID: PMC9794817 DOI: 10.1038/s41598-022-26545-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/11/2022] [Accepted: 12/15/2022] [Indexed: 12/28/2022] Open
Abstract
The influence of hypervolemia and intraoperative administration of nitroglycerine on gastric tube microperfusion remains unclear The present study aimed to investigate the impact of different hemodynamic settings on gastric tube microperfusion quantified by fluorescence imaging with Indocyanine green (ICG-FI) as a promising tool for perfusion evaluation. Three groups with seven pigs each were formed using noradrenaline, nitroglycerin, and hypervolemia for hemodynamic management, respectively. ICG-FI, hemodynamic parameters, and transit-time flow measurement (TTFM) in the right gastroepiploic artery were continuously assessed. Fluorescent microspheres (FM) were administered, and the partial pressure of tissue oxygen was quantified. The administration of nitroglycerine and hypervolemia were both associated with significantly impaired microperfusion compared to the noradrenaline group quantified by ICG-FI. Even the most minor differences in microperfusion could be sufficiently predicted which, however, could not be represented by the mean arterial pressure measurement. Histopathological findings supported these results with a higher degree of epithelial damage in areas with impaired perfusion. The values measured by ICG-FI significantly correlated with the FM measurement. Using tissue oxygenation and TTFM for perfusion measurement, changes in microperfusion could not be comprehended. Our results support current clinical practice with restrictive volume and catecholamine administration in major surgery. Hypervolemia and continuous administration of nitroglycerine should be avoided.
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Yang J, Guo X, Zheng Z, Ke W. Is there a relationship between two different anesthetic methods and postoperative length of stay during radical resection of malignant esophageal tumors in China?: a retrospective cohort study. BMC Anesthesiol 2022; 22:236. [PMID: 35879661 PMCID: PMC9310395 DOI: 10.1186/s12871-022-01775-6] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/11/2022] [Accepted: 07/14/2022] [Indexed: 02/05/2023] Open
Abstract
BACKGROUND Data providing a relationship between the anesthetic method and postoperative length of stay (PLOS) is limited. We aimed to investigate whether general anesthesia alone or combined with epidural anesthesia might affect perioperative risk factors and PLOS for patients undergoing radical resection of malignant esophageal tumors. METHODS The study retrospectively analyzed the clinical data of 680 patients who underwent a radical esophageal malignant tumor resection in a Chinese hospital from January 01, 2010, to December 31, 2020. The primary outcome measure was PLOS, and the secondary outcome was perioperative risk-related parameters that affect PLOS. The independent variable was the type of anesthesia: general anesthesia (GA) or combined epidural-general anesthesia (E-GA). The dependent variable was PLOS. We conducted univariate and multivariate logistic regression and propensity score matching to compare the relationships of GA and E-GA with PLOS and identify the perioperative risk factors for PLOS. In this cohort study, the confounders included sociodemographic data, preoperative chemotherapy, coexisting diseases, laboratory parameters, intraoperative variables, and postoperative complications. RESULTS In all patients, the average PLOS was 19.85 ± 12.60 days. There was no significant difference in PLOS between the GA group and the E-GA group either before or after propensity score matching (20.01 days ± 14.90 days vs. 19.79 days ± 11.57 days, P = 0.094, 18.09 ± 9.71 days vs. 19.39 ± 10.75 days, P = 0.145). The significant risk factors for increased PLOS were lung infection (β = 3.35, 95% confidence interval (CI): 1.54-5.52), anastomotic leakage (β = 25.73, 95% CI: 22.11-29.34), and surgical site infection (β = 9.39, 95% CI: 4.10-14.68) by multivariate regression analysis. Subgroup analysis revealed a stronger association between PLOS and vasoactive drug use, blood transfusions, and open esophagectomy. The results remained essentially the same (stable and reliable) after subgroup analysis. CONCLUSIONS Although there is no significant association between the type of anesthesia(GA or E-GA) and PLOS for patients undergoing radical esophageal malignant tumor resection, an association between PLOS and lung infection, anastomotic leakage, and surgical site infection was determined by multivariate regression analysis. A larger sample future study design may verify our results.
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Affiliation(s)
- Jieping Yang
- Department of Anesthesiology, The First Affiliated Hospital of Shantou University Medical College, No. 57 Changping Road, Jinping District, Shantou City, Guangdong Province, China
| | - Xukeng Guo
- Department of Anesthesiology, The First Affiliated Hospital of Shantou University Medical College, No. 57 Changping Road, Jinping District, Shantou City, Guangdong Province, China
| | - Zonggui Zheng
- Department of Anesthesiology, The Third People' Hospital of Shantou, No. 12 Haipang Road, Haojiang District, Shantou City, Guangdong Province, China
| | - Weiqi Ke
- Department of Anesthesiology, The First Affiliated Hospital of Shantou University Medical College, No. 57 Changping Road, Jinping District, Shantou City, Guangdong Province, China
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Walsh KJ, Zhang H, Tan KS, Pedoto A, Desiderio DP, Fischer GW, Bains MS, Jones DR, Molena D, Amar D. Use of vasopressors during esophagectomy is not associated with increased risk of anastomotic leak. Dis Esophagus 2020; 34:5907947. [PMID: 32944749 PMCID: PMC8024447 DOI: 10.1093/dote/doaa090] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/22/2020] [Revised: 07/15/2020] [Accepted: 07/30/2020] [Indexed: 12/11/2022]
Abstract
Vasopressor use during esophagectomy has been reported to increase the risk of postoperative anastomotic leak and associated morbidity. We sought to assess the association between vasopressor use and fluid (crystalloid and colloid) administration and anastomotic leak following open esophagectomy. Patients who underwent open Ivor Lewis esophagectomy were identified from a prospective institutional database. The primary outcome was postoperative anastomotic leak (any grade) and analyzed using logistic regression models. Postoperative anastomotic leak developed in 52 of 327 consecutive patients (16%) and was not significantly associated with vasopressor use or fluid administered in either univariable or multivariable analyses. Increasing body mass index was the only significant characteristic of both univariable (P = 0.004) and multivariable analyses associated with anastomotic leak (odds ratio, 1.05; 95% confidence interval, 1.01-1.09; P = 0.007). Of the 52 patients that developed an anastomotic leak, 12 (23%) were grade 1, 21 (40%) were grade 2 and 19 (37%) were grade 3. In our cohort, only body mass index, and not intraoperative vasopressor use and fluid administration, was significantly associated with increased odds of postoperative anastomotic leak following open Ivor Lewis esophagectomy.
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Affiliation(s)
- Kevin J Walsh
- Department of Anesthesiology and Critical Care Medicine, Memorial Sloan Kettering Cancer Center, New York, NY, USA,Weill Cornell Medical College, New York, NY, USA
| | - Hao Zhang
- Department of Anesthesiology and Critical Care Medicine, Memorial Sloan Kettering Cancer Center, New York, NY, USA,Weill Cornell Medical College, New York, NY, USA
| | - Kay See Tan
- Department of Epidemiology and Biostatistics, Memorial Sloan Kettering Cancer Center, New York, NY, USA
| | - Alessia Pedoto
- Department of Anesthesiology and Critical Care Medicine, Memorial Sloan Kettering Cancer Center, New York, NY, USA,Weill Cornell Medical College, New York, NY, USA
| | - Dawn P Desiderio
- Department of Anesthesiology and Critical Care Medicine, Memorial Sloan Kettering Cancer Center, New York, NY, USA,Weill Cornell Medical College, New York, NY, USA
| | - Gregory W Fischer
- Department of Anesthesiology and Critical Care Medicine, Memorial Sloan Kettering Cancer Center, New York, NY, USA,Weill Cornell Medical College, New York, NY, USA
| | - Manjit S Bains
- Thoracic Surgery Service, Department of Surgery, Memorial Sloan Kettering Cancer Center, New York, NY, USA
| | - David R Jones
- Thoracic Surgery Service, Department of Surgery, Memorial Sloan Kettering Cancer Center, New York, NY, USA
| | - Daniela Molena
- Thoracic Surgery Service, Department of Surgery, Memorial Sloan Kettering Cancer Center, New York, NY, USA
| | - David Amar
- Address correspondence to: David Amar, MD, Director of Thoracic Anesthesia, Memorial Sloan Kettering Cancer Center, 1275 York Avenue, M-304, New York, NY 10021, USA.
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Restrictive intraoperative fluid management was associated with higher incidence of composite complications compared to less restrictive strategies in open thoracotomy: A retrospective cohort study. Sci Rep 2020; 10:8449. [PMID: 32439944 PMCID: PMC7242459 DOI: 10.1038/s41598-020-65532-w] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/29/2019] [Accepted: 04/30/2020] [Indexed: 01/15/2023] Open
Abstract
Restrictive fluid management has been recommended for thoracic surgery. However, specific guidelines are lacking, and there is always concern regarding impairment of renal perfusion with a restrictive policy. The objective of this study was to find the net intraoperative fluid infusion rate which shows the lowest incidence of composite complications (either pulmonary complications or acute kidney injury) in open thoracotomy. We hypothesized that a certain range of infusion rate would decrease the composite complications within postoperative 30 days. All patients (n = 1,031) who underwent open thoracotomy at a tertiary care university hospital were included in this retrospective study. The time frame of fluid monitoring was from the start of operation to postoperative 24 hours. The cutoff value of the intraoperative net fluid amount was 4–5 ml.kg−1.h−1 according to the minimum p-value method, thus, patients were divided into Low (≤3 ml.kg−1.h−1), Cutoff (4–5 ml.kg−1.h−1) and High (≥6 ml.kg−1.h−1) groups. The Cutoff group showed the lowest composite complication rate (19%, 12%, and 13% in the Low, Cutoff, and High groups, respectively, P = 0.0283; Low vs. Cutoff, P = 0.0324, Bonferroni correction). Acute respiratory distress syndrome occurred least frequently in the Cutoff group (7%, 3%, and 6% for the Low, Cutoff, and High groups, respectively, P = 0.0467; Low vs. Cutoff, P = 0.0432, Bonferroni correction). In multivariable analysis, intraoperative net fluid infusion rate was associated with composite complications, and the Cutoff group decreased risk (odds ratio 0.54, 95% confidence interval: 0.35–0.81, P = 0.0035). In conclusion, maintaining intraoperative net fluid infusion at 4–5 ml.kg−1.h−1 was associated with better results in open thoracotomy, in terms of composite complications, compared to more restrictive fluid management.
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Jeong H, Choi JW, Ahn HJ, Choi YS, Kim JA, Yang M, Kim JK, Kim DK, Shin BS, Lee SH, Kim YR, Park M, Chung YJ. The effect of preventive use of corticosteroids on postoperative complications after esophagectomy: A retrospective cohort study. Sci Rep 2019; 9:11984. [PMID: 31427671 PMCID: PMC6700144 DOI: 10.1038/s41598-019-48349-0] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/13/2019] [Accepted: 07/31/2019] [Indexed: 12/18/2022] Open
Abstract
Corticosteroids have been empirically administered to reduce the rate of acute respiratory distress syndrome (ARDS) after esophagectomy. However, their efficacy remains controversial, and corticosteroids may increase the risk of graft dehiscence and infection, which are major concerns after esophagectomy. Therefore, we compared the incidence of composite complications (ARDS, graft dehiscence and infection) after esophagectomy between patients who received a preventive administration of corticosteroids and those who did not. All patients who underwent esophagectomy from 2010 to 2015 at a tertiary care university hospital were reviewed retrospectively (n = 980). Patients were divided into Steroid (n = 120) and Control (n = 860) groups based on the preventive administration of 100 mg hydrocortisone during surgery. The primary endpoint was the incidence of composite complications. The incidence of composite complications was not different between the Control and Steroid groups (17.4% vs. 21.7% respectively; P = 0.26). The incidence rates of complications in each category were not different between the Control and Steroid groups: ARDS (3.8% vs. 5.0%; P = 0.46), graft dehiscence (4.8% vs. 6.7%; P = 0.37), and infection (12.8% vs. 15.8%; P = 0.36). Propensity score matching revealed that composite complications (20.0% vs. 21.7%; P = 0.75), ARDS (4.3% vs. 5.2%; P = 0.76) and infection (16.5% vs. 15.7%; P = 0.86) were not different between the Control and Steroid group, but the incidence of graft dehiscence was higher in the Steroid group than in the Control group (0.9% vs. 7.0%; P = 0.0175). In conclusions, the preventive use of corticosteroids did not reduce the incidence of ARDS, but may be related to an increased incidence of graft dehiscence. Therefore, routine administration of corticosteroids to prevent ARDS is not recommended in esophagectomy.
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Affiliation(s)
- Heejoon Jeong
- Department of Anesthesiology and Pain Medicine, Samsung Medical Center, Sungkyunkwan University School of Medicine, 81 Irwon-ro, Gangnam-gu, Seoul, 06351, Republic of Korea
| | - Ji Won Choi
- Department of Anesthesiology and Pain Medicine, Samsung Medical Center, Sungkyunkwan University School of Medicine, 81 Irwon-ro, Gangnam-gu, Seoul, 06351, Republic of Korea
| | - Hyun Joo Ahn
- Department of Anesthesiology and Pain Medicine, Samsung Medical Center, Sungkyunkwan University School of Medicine, 81 Irwon-ro, Gangnam-gu, Seoul, 06351, Republic of Korea.
| | - Yong Soo Choi
- Department of Thoracic Surgery, Samsung Medical Center, Sungkyunkwan University School of Medicine, 81 Irwon-ro, Gangnam-gu, Seoul, 06351, Republic of Korea
| | - Jie Ae Kim
- Department of Anesthesiology and Pain Medicine, Samsung Medical Center, Sungkyunkwan University School of Medicine, 81 Irwon-ro, Gangnam-gu, Seoul, 06351, Republic of Korea
| | - Mikyung Yang
- Department of Anesthesiology and Pain Medicine, Samsung Medical Center, Sungkyunkwan University School of Medicine, 81 Irwon-ro, Gangnam-gu, Seoul, 06351, Republic of Korea
| | - Jin Kyoung Kim
- Department of Anesthesiology and Pain Medicine, Samsung Medical Center, Sungkyunkwan University School of Medicine, 81 Irwon-ro, Gangnam-gu, Seoul, 06351, Republic of Korea
| | - Duk Kyung Kim
- Department of Anesthesiology and Pain Medicine, Samsung Medical Center, Sungkyunkwan University School of Medicine, 81 Irwon-ro, Gangnam-gu, Seoul, 06351, Republic of Korea
| | - Byung Seop Shin
- Department of Anesthesiology and Pain Medicine, Samsung Medical Center, Sungkyunkwan University School of Medicine, 81 Irwon-ro, Gangnam-gu, Seoul, 06351, Republic of Korea
| | - Sang Hyun Lee
- Department of Anesthesiology and Pain Medicine, Samsung Medical Center, Sungkyunkwan University School of Medicine, 81 Irwon-ro, Gangnam-gu, Seoul, 06351, Republic of Korea
| | - Young Ri Kim
- Department of Anesthesiology and Pain Medicine, Samsung Medical Center, Sungkyunkwan University School of Medicine, 81 Irwon-ro, Gangnam-gu, Seoul, 06351, Republic of Korea
| | - Mihye Park
- Department of Anesthesiology and Pain Medicine, Samsung Medical Center, Sungkyunkwan University School of Medicine, 81 Irwon-ro, Gangnam-gu, Seoul, 06351, Republic of Korea
| | - Yoon Joo Chung
- Department of Anesthesiology and Pain Medicine, Samsung Medical Center, Sungkyunkwan University School of Medicine, 81 Irwon-ro, Gangnam-gu, Seoul, 06351, Republic of Korea
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10
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Klevebro F, Boshier PR, Low DE. Application of standardized hemodynamic protocols within enhanced recovery after surgery programs to improve outcomes associated with anastomotic leak and conduit necrosis in patients undergoing esophagectomy. J Thorac Dis 2019; 11:S692-S701. [PMID: 31080646 PMCID: PMC6503292 DOI: 10.21037/jtd.2018.11.141] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/27/2018] [Accepted: 11/29/2018] [Indexed: 12/13/2022]
Abstract
Esophagectomy for cancer is associated with high risk for postoperative morbidity. The most serious regularly encountered complication is anastomotic leak and the most feared individual complication is conduit necrosis. Both of these complications affect the length of stay, mortality, quality of life, and survival for patients undergoing esophageal resection. The maintenance of conduit viability is of primary importance in the perioperative care of patients following esophageal resection. It has been shown that restrictive fluid management may be associated with improved postoperative outcomes in abdominal and other types of surgery, but many factors can affect the incidence of anastomotic leak and the viability of the gastric conduit. We have performed a comprehensive review with the aim to give an overview of the available evidence for the use of standardized hemodynamic protocols (SHPs) for esophagectomy and review the hemodynamic protocol, which has been applied within a standardized clinical pathway (SCP) at the Department of Thoracic surgery at the Virginia Mason Medical Center between 2004-2018 where the anastomotic leak rate over the period has been 5.2% and the incidence of conduit necrosis requiring surgical management is zero. The literature review demonstrates that there are few high quality studies that provide scientific evidence for the use of a SHP. The evidence indicates that the use of goal-directed hemodynamic monitoring might be associated with a reduced risk for postoperative complications, shortened length of stay, and decreased need for intensive care unit stay. We propose that the routine application of a SHP can provide a uniform infrastructure to optimize conduit perfusion and decrease the incidence of anastomotic leak.
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Affiliation(s)
- Fredrik Klevebro
- Department of Thoracic Surgery, Virginia Mason Medical Center, Seattle, USA
| | - Piers R Boshier
- Department of Thoracic Surgery, Virginia Mason Medical Center, Seattle, USA
| | - Donald E Low
- Department of Thoracic Surgery, Virginia Mason Medical Center, Seattle, USA
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Buise MP. Proper volume management during anesthesia for esophageal resection. J Thorac Dis 2019; 11:S702-S706. [PMID: 31080647 PMCID: PMC6503285 DOI: 10.21037/jtd.2019.01.33] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/31/2018] [Accepted: 01/09/2019] [Indexed: 12/12/2022]
Abstract
Esophagectomy is a high-risk surgical procedure with significant postoperative morbidity and mortality. Proper fluid management is essential to reduce postoperative pulmonary complications. Restrictive management is advocated in ERAS based protocols and recent guidelines for esophagectomy, however Goal Directed treatment may be useful. Perioperative fluid management must always be seen in light of a multi modal approach and must be balanced at the needs of the patient and the surgical approach chosen.
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Affiliation(s)
- Marc P Buise
- Department of Anesthesia and Intensive Care, Catharina Hospital Eindhoven, Eindhoven, The Netherlands
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12
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Low DE, Allum W, De Manzoni G, Ferri L, Immanuel A, Kuppusamy M, Law S, Lindblad M, Maynard N, Neal J, Pramesh CS, Scott M, Mark Smithers B, Addor V, Ljungqvist O. Guidelines for Perioperative Care in Esophagectomy: Enhanced Recovery After Surgery (ERAS®) Society Recommendations. World J Surg 2018; 43:299-330. [DOI: 10.1007/s00268-018-4786-4] [Citation(s) in RCA: 239] [Impact Index Per Article: 39.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
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13
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Grondell J, Holleran C, Mintz E, Wiesel O. Postoperative Bedside Critical Care of Thoracic Surgery Patients. Am J Crit Care 2018; 27:328-333. [PMID: 29961669 DOI: 10.4037/ajcc2018107] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/01/2022]
Affiliation(s)
- Jennifer Grondell
- Jennifer Grondell is nurse in charge and Charlotte Holleran is a staff nurse in the thoracic surgical intensive care unit, Brigham and Women’s Hospital, Harvard Medical School, Boston, Massachusetts. Esther Mintz is a nurse practitioner and first assistant and Ory Wiesel is a thoracic surgeon, Division of Thoracic Surgery, Maimonides Medical Center, Brooklyn, New York
| | - Charlotte Holleran
- Jennifer Grondell is nurse in charge and Charlotte Holleran is a staff nurse in the thoracic surgical intensive care unit, Brigham and Women’s Hospital, Harvard Medical School, Boston, Massachusetts. Esther Mintz is a nurse practitioner and first assistant and Ory Wiesel is a thoracic surgeon, Division of Thoracic Surgery, Maimonides Medical Center, Brooklyn, New York
| | - Esther Mintz
- Jennifer Grondell is nurse in charge and Charlotte Holleran is a staff nurse in the thoracic surgical intensive care unit, Brigham and Women’s Hospital, Harvard Medical School, Boston, Massachusetts. Esther Mintz is a nurse practitioner and first assistant and Ory Wiesel is a thoracic surgeon, Division of Thoracic Surgery, Maimonides Medical Center, Brooklyn, New York
| | - Ory Wiesel
- Jennifer Grondell is nurse in charge and Charlotte Holleran is a staff nurse in the thoracic surgical intensive care unit, Brigham and Women’s Hospital, Harvard Medical School, Boston, Massachusetts. Esther Mintz is a nurse practitioner and first assistant and Ory Wiesel is a thoracic surgeon, Division of Thoracic Surgery, Maimonides Medical Center, Brooklyn, New York
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14
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Ma C, Edwards JK. Anesthesia for Esophageal Surgery. Anesthesiology 2018. [DOI: 10.1007/978-3-319-74766-8_14] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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15
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Hoffmann H, Delko T, Kirchhoff P, Rosenthal R, Schäfer J, Kraljević M, Kettelhack C. Colon Perfusion Patterns During Colorectal Resection Using Visible Light Spectroscopy. World J Surg 2017; 41:2923-2932. [PMID: 28717916 DOI: 10.1007/s00268-017-4100-x] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
BACKGROUND The impact of blood supply to the anastomosis on development of anastomotic leakage is still a matter of debate. Considering that bowel perfusion may be affected by manipulation during surgery, perfusion assessment of the anastomosis alone may be of limited value. We propose perfusion assessment at different time points during surgery to explore the dynamics of bowel perfusion during colorectal resection and its impact on outcome. METHODS In this prospective cohort study, patients undergoing elective colorectal resection were eligible. Colon perfusion was evaluated using visible light spectroscopy. Main outcome was the difference in colon perfusion, quantified by measuring tissue oxygen saturation (StO2) in the colonic serosa, before and after anastomosis during surgery. RESULTS We included 58 patients between July 2013 and November 2015. Colon perfusion increased by an average of 5.9% StO2 during surgery (95% confidence interval 3.1, 8.8; P < 0.001). The number of patients with abnormal perfusion (defined as StO2 < 65%) decreased from 50% at the beginning to 24% by the end of surgery. Six patients (10%) developed anastomotic leaks (AL), of which five patients had abnormal perfusion at the beginning of surgery, whereas four patients had normal StO2 at the anastomosis. CONCLUSION Colon perfusion significantly increased during colorectal surgery. Considering that one quarter of patients had suboptimal anastomotic perfusion without developing AL, impaired blood flow at the anastomosis alone does not seem to be critical. Further investigations including more patients are necessary to evaluate the impact of perioperative parameters on colon perfusion, anastomotic healing and surgical outcome.
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Affiliation(s)
- Henry Hoffmann
- Department of Surgery, University Hospital Basel, Spitalstrasse 21, 4031, Basel, Switzerland.
| | - Tarik Delko
- Department of Surgery, University Hospital Basel, Spitalstrasse 21, 4031, Basel, Switzerland
| | - Philipp Kirchhoff
- Department of Surgery, University Hospital Basel, Spitalstrasse 21, 4031, Basel, Switzerland
| | - Rachel Rosenthal
- Department of Surgery, University Hospital Basel, Spitalstrasse 21, 4031, Basel, Switzerland
| | - Juliane Schäfer
- Department of Surgery, University Hospital Basel, Spitalstrasse 21, 4031, Basel, Switzerland
- Basel Institute for Clinical Epidemiology and Biostatistics, University Hospital Basel, Basel, Switzerland
| | - Marko Kraljević
- Department of Surgery, University Hospital Basel, Spitalstrasse 21, 4031, Basel, Switzerland
| | - Christoph Kettelhack
- Department of Surgery, University Hospital Basel, Spitalstrasse 21, 4031, Basel, Switzerland
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Collazo S, Graf NL. A System-Based Nursing Approach to Improve Outcomes in the Postoperative Esophagectomy Patient. Semin Oncol Nurs 2017; 33:37-51. [DOI: 10.1016/j.soncn.2016.11.004] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
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Ischemic Conditioning of the Stomach in the Prevention of Esophagogastric Anastomotic Leakage After Esophagectomy. Ann Thorac Surg 2016; 101:1614-23. [PMID: 26857639 DOI: 10.1016/j.athoracsur.2015.10.034] [Citation(s) in RCA: 35] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/28/2015] [Revised: 10/07/2015] [Accepted: 10/12/2015] [Indexed: 12/11/2022]
Abstract
Esophagectomy with esophagogastric anastomosis is a major procedure, and its most feared complication is anastomotic leakage. Ischemic conditioning of the stomach is a method used with the aim of reducing the risk of leakage. It consists of partial gastric devascularization through embolization or laparoscopy followed by esophagectomy and anastomosis at a second stage, thus providing the time for the gastric conduit to adapt to the acute ischemia at the time of its formation. This review analyzes the information from all currently available experimental and clinical studies with the purpose of assessing the current role of the technique and to provide future recommendations.
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Abstract
The management of conduit necrosis during or after esophagectomy requires the assembly of a multidisciplinary team to manage nutrition, sepsis, intravenous access, reconstruction, and recovery. Reconstruction is most often performed as a staged procedure. The initial surgery is likely to involve esophageal diversion onto the chest where possible, making an effort to preserve esophageal length. Optimization of patients before reconstruction enhances outcomes following reconstruction with either jejunum or colon after gastric conduit failure. Maintaining enteral access for feeding at all times is imperative. Management of patients should be performed at high-volume esophageal centers performing regular reconstructions.
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Affiliation(s)
- Karen J Dickinson
- Department of Thoracic Surgery, Mayo Clinic, MA-12-00-1, 200 First Street, Rochester, MN 55905, USA
| | - Shanda H Blackmon
- Department of Thoracic Surgery, Mayo Clinic, MA-12-00-1, 200 First Street, Rochester, MN 55905, USA.
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Abstract
Esophagectomy is a high-risk operation with significant perioperative morbidity and mortality. Attention to detail in many areas of perioperative management should lead to an aggregation of marginal gains and improvement in postoperative outcome. This review addresses preoperative assessment and patient selection, perioperative care (focusing on pulmonary prehabilitation, ventilation strategies, goal-directed fluid therapy, analgesia, and cardiovascular complications), minimally invasive surgery, and current evidence for enhanced recovery in esophagectomy.
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Affiliation(s)
- Adam Carney
- Department of Anaesthesia, Nottingham University Hospitals NHS Trust, City Campus, Hucknall Road, Nottingham NG5 1PB, UK.
| | - Matt Dickinson
- Department of Anaesthesia, Perioperative Medicine and Pain, Royal Surrey County Hospital NHS Foundation Trust, Egerton Road, Guildford, Surrey GU2 7XX, UK
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Does tissue ischemia actually contribute to leak after sleeve gastrectomy? An experimental study. Obes Surg 2015; 24:675-83. [PMID: 24374891 DOI: 10.1007/s11695-013-1156-z] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
BACKGROUND Staple line leak, although rare, is among the most common postoperative complications after sleeve gastrectomy (SG) and usually occurs in the gastroesophageal (GE) junction. Increased intragastric pressure, regional ischemia, and technical failure of stapling devices have been reported as the main risk factors of postoperative leak. The aim of this study was to evaluate the impact of ischemia and intraluminal pressure in leak appearance. METHODS Landrace swine (n = 12) were subjected to SG and total gastrectomy subsequently. Lactic acid, glycerol, and pyruvate were measured by microdialysis in GE junction and pylorus before and nine times after operation, and lactate/pyruvate (L/P) ratio was calculated as well. Moreover, ex vivo air was insufflated inside the tubularized stomach till a rupture of the staple line occurs. Maximum air pressure reached and location of rupture were recorded. RESULTS Increase of lactic acid and L/P ratio were demonstrated in GE junction measurements; however, when the measurements between GE junction and pylorus were compared, no statistically significant differences were found, with the exception of a slightly increased lactate concentration in pylorus in the midst of measurements. The maximum air pressure recorded varied from 3 to 75 mmHg (mean 24.5 mmHg) and the majority of ruptures (n = 8) occurred in GE junction. In one of them, clip displacement was noticed. CONCLUSIONS No evidence of increased ischemia in GE junction compared to pylorus was recorded. Increased intraluminal pressure and stapling malfunction may play the most important role in leak appearance.
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Bartels K, Fiegel M, Stevens Q, Ahlgren B, Weitzel N. Approaches to perioperative care for esophagectomy. J Cardiothorac Vasc Anesth 2014; 29:472-80. [PMID: 25649698 DOI: 10.1053/j.jvca.2014.10.029] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/16/2014] [Indexed: 12/14/2022]
Affiliation(s)
- Karsten Bartels
- Department of Anesthesiology, University of Colorado School of Medicine, Anschutz Medical Campus, Aurora, Colorado
| | - Matthew Fiegel
- Department of Anesthesiology, University of Colorado School of Medicine, Anschutz Medical Campus, Aurora, Colorado
| | - Quinn Stevens
- Department of Anesthesiology, University of Colorado School of Medicine, Anschutz Medical Campus, Aurora, Colorado
| | - Bryan Ahlgren
- Department of Anesthesiology, University of Colorado School of Medicine, Anschutz Medical Campus, Aurora, Colorado
| | - Nathaen Weitzel
- Department of Anesthesiology, University of Colorado School of Medicine, Anschutz Medical Campus, Aurora, Colorado.
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Ashes C, Slinger P. Volume Management and Resuscitation in Thoracic Surgery. CURRENT ANESTHESIOLOGY REPORTS 2014. [DOI: 10.1007/s40140-014-0081-6] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
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Slinger P. Are lung-protective ventilation strategies worth the effort? SOUTHERN AFRICAN JOURNAL OF ANAESTHESIA AND ANALGESIA 2013. [DOI: 10.1080/22201173.2013.10872890] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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Abstract
Surgical resection remains a standard treatment option for localized esophageal cancer. Surgical approaches to esophagectomy include transhiatal and transthoracic techniques as well as minimally invasive techniques that have been developed to reduce the morbidities associated with laparotomy and thoracotomy incisions. The perioperative mortality for esophagectomy remains high with cardiopulmonary and anastomotic complications as the most frequent and serious morbidities. This article reviews the management of patients presenting for esophagectomy, with a focus on evidence-based anesthetic and perioperative approaches for improving outcomes.
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Affiliation(s)
- J Michael Jaeger
- TCV Surgical ICU, University of Virginia Health System, Charlottesville, VA 22908-0710, USA
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Slinger P, Kilpatrick B. Perioperative lung protection strategies in cardiothoracic anesthesia: are they useful? Anesthesiol Clin 2012; 30:607-28. [PMID: 23089498 DOI: 10.1016/j.anclin.2012.07.001] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
Abstract
Patients are at risk for several types of lung injury in the perioperative period. These injuries include atelectasis, pneumonia, pneumothorax, bronchopleural fistula, acute lung injury, and acute respiratory distress syndrome. Anesthetic management can cause, exacerbate, or ameliorate most of these injuries. Lung-protective ventilation strategies using more physiologic tidal volumes and appropriate levels of positive end-expiratory pressure can decrease the extent of this injury. This review discusses the effects of mechanical ventilation and its role in ventilator-induced lung injury with specific reference to cardiothoracic anesthesia.
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Affiliation(s)
- Peter Slinger
- Department of Anesthesia, Toronto General Hospital, University of Toronto, Toronto, Ontario, Canada.
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The effects of intravenous nitroglycerine and norepinephrine on gastric microvascular perfusion in an experimental model of gastric tube reconstruction. Surgery 2010; 148:71-7. [DOI: 10.1016/j.surg.2009.12.011] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/05/2009] [Accepted: 12/15/2009] [Indexed: 11/23/2022]
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Klijn E, Niehof S, de Jonge J, Gommers D, Ince C, van Bommel J. The Effect of Perfusion Pressure on Gastric Tissue Blood Flow in an Experimental Gastric Tube Model. Anesth Analg 2010; 110:541-6. [DOI: 10.1213/ane.0b013e3181c84e33] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
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30
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Buise M, van Bommel J, Gommers D. The effect of vasopressors on perfusion of gastric graft after esophagectomy. J Gastrointest Surg 2009; 13:1019; author reply 1020. [PMID: 19274479 DOI: 10.1007/s11605-009-0844-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/09/2008] [Accepted: 02/18/2009] [Indexed: 01/31/2023]
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