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Rosen MN, Mor R, Roberts DJ, McIsaac DI. Contraindications to use of neuraxial anesthesia for lower limb revascularization surgery in adults: a cross-sectional study. Can J Anaesth 2024; 71:808-817. [PMID: 37498443 DOI: 10.1007/s12630-023-02546-8] [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: 09/02/2022] [Revised: 12/08/2022] [Accepted: 12/09/2022] [Indexed: 07/28/2023] Open
Abstract
PURPOSE Nonrandomized and some randomized data suggest neuraxial anesthesia may improve outcomes after lower limb revascularization surgery. Nevertheless, the prevalence of contraindications to neuraxial anesthesia in vascular surgery patients is unknown. We aimed to identify the prevalence of patients with contraindications to neuraxial anesthesia, and to derive and validate a case ascertainment algorithm identifying individuals likely to have contraindications. METHODS We conducted a historical cross-sectional study of open lower limb revascularization surgeries performed between 2019 and 2021 at The Ottawa Hospital. Medical records were reviewed for demographic data, admission, procedural characteristics, and presence of contraindications to neuraxial anesthesia. Case ascertainment algorithms to predict the presence of absolute contraindications to neuraxial anesthesia were derived and internally validated. RESULTS We identified 340 cases. General anesthesia was used in 219 (64.4%) cases, isolated neuraxial (spinal and/or epidural) in 106 (31.2%) cases, and general plus neuraxial in 15 (4.4%) cases. Seventy-eight (22.9%; 95% confidence interval [CI], 18.8 to 27.7) patients had absolute contraindications to neuraxial anesthesia, primarily because of anticoagulation or antiplatelet medication (89.4%); 21 (6.2%; 95% CI, 4.1 to 9.3) had relative contraindications, primarily long anticipated duration of surgery (16/21, 76.2%). We derived and validated three nested case-ascertainment algorithms. Using admission and procedure variables, discrimination was moderate with moderately explained variance, and calibration was inadequate for reliable use. Patient comorbidity and laboratory data did not improve algorithm performance. CONCLUSION Most patients undergoing lower limb revascularization surgery did not have absolute contraindications to neuraxial anesthesia. When present, contraindications typically related to anticoagulation. Admission, procedure, comorbidity, and laboratory data did not provide adequate accuracy to ascertain contraindication status.
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Affiliation(s)
- Michael N Rosen
- Faculty of Medicine, University of Ottawa, Ottawa, ON, Canada
| | - Rahul Mor
- Faculty of Medicine, University of Ottawa, Ottawa, ON, Canada
| | - Derek J Roberts
- Division of Vascular and Endovascular Surgery, Department of Surgery, University of Ottawa and The Ottawa Hospital, Ottawa, ON, Canada
- School of Epidemiology and Public Health, University of Ottawa, Ottawa, ON, Canada
- Ottawa Hospital Research Institute, Ottawa, ON, Canada
- The O'Brien Institute for Public Health, University of Calgary, Calgary, AB, Canada
| | - Daniel I McIsaac
- School of Epidemiology and Public Health, University of Ottawa, Ottawa, ON, Canada.
- Ottawa Hospital Research Institute, Ottawa, ON, Canada.
- Department of Anesthesiology and Pain Medicine, University of Ottawa and The Ottawa Hospital, Room B311, 1053 Carling Ave., Ottawa, ON, K1Y 4E9, Canada.
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Körner L, Riddersholm S, Torp-Pedersen C, Houlind K, Bisgaard J. Is General Anesthesia for Peripheral Vascular Surgery Correlated with Impaired Outcome in Patients with Cardiac Comorbidity? A Closer Look into the Nationwide Danish Cohort. J Cardiothorac Vasc Anesth 2024:S1053-0770(24)00219-2. [PMID: 38789284 DOI: 10.1053/j.jvca.2024.03.028] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/26/2023] [Revised: 02/27/2024] [Accepted: 03/20/2024] [Indexed: 05/26/2024]
Abstract
OBJECTIVE General anesthesia (GA) may impair outcome after vascular surgery. The use of anticoagulant medication is often used in patients with cardiac comorbidity. Regional anesthesia (RA) requires planning of discontinuation before neuraxial blockade(s) in this subgroup. This study aimed to describe the effect of anesthesia choice on outcome after vascular surgery in patients with known cardiac comorbidity. DESIGN Retrospective cohort study. SETTING Danish hospitals. PARTICIPANTS 6302 patients with known cardiac comorbidity, defined as ischemic heart disease, valve disease, pulmonary vascular disease, heart failure, and cardiac arrhythmias, undergoing lower extremity vascular surgery between 2005 and 2017. INTERVENTIONS GA versus RA. MEASUREMENTS AND MAIN RESULTS Data were extracted from national registries. GA was defined as anesthesia with mechanical ventilation. Multivariable regression models were used to describe the incidence of postoperative complications as well as 30-day mortality, hypothesizing that better outcomes would be seen after RA. The rate of RA decreased from 48% in 2005 to 20% in 2017. The number of patients with 1 or more complications was 9.7% vs 6.2% (p < 0.001), and 30-day mortality was 6.0% vs 3.4% (p < 0.001) after GA. After adjusting for baseline differences, the odds ratio (OR) was significantly lower for medical complications (cardiac, pulmonary, renal, new dialysis, intensive care unit and other medical complications; OR, 0.97; 95% confidence interval [CI], 0.95-0.98) and 30-day mortality (OR 0.98; 95% CI, 0.97-0.99) after RA. CONCLUSIONS RA may be associated with a better outcome than GA after lower extremity vascular surgery in patients with a cardiac comorbidity. Prioritizing RA, despite the inconvenience of discontinuing anticoagulants, may be recommended.
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Affiliation(s)
- Luisa Körner
- Department of Anesthesiology, Aalborg University Hospital, Aalborg, Denmark.
| | - Signe Riddersholm
- Department of Cardiology, Aalborg University Hospital, Aalborg, Denmark
| | | | - Kim Houlind
- Department of Vascular Surgery, Lillebælt Hospital, Kolding, Denmark
| | - Jannie Bisgaard
- Department of Anesthesiology, Aalborg University Hospital, Aalborg, Denmark; Department of Clinical Medicine, Aalborg University, Aalborg, Denmark
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Png CYM, Boitano LT, Srivastava SD, Mohapatra A, Malek JY, Stern JR, Eagleton MJ, Dua A. Room for improvement in patient compliance during peripheral vascular interventions. JVS-VASCULAR INSIGHTS 2024; 2:100059. [PMID: 38505294 PMCID: PMC10949838 DOI: 10.1016/j.jvsvi.2024.100059] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 03/21/2024]
Abstract
Introduction For patients receiving Procedural Sedation and Analgesia (PSA), patient cooperation is crucial as patients remain continuously aware of operating room activity and can be asked to perform tasks such as prolonged breath-holds. This survey aimed to collect information on patient compliance with on-table instructions and its relation to periprocedural outcomes from surgeons nationwide performing peripheral vascular interventions (PVI) under PSA. Methods A 9-question online survey was sent to 383 vascular surgeons (including both vascular surgery attendings and trainees) across the United States through REDCap from August 30 to September 21, 2021, with responses closed on October 30, 2021. The survey response was analyzed with descriptive statistics. Results 83 (21.6%) vascular surgeons responded to the survey, of which 67 (80.7%) were attending vascular surgeons and 16 (19.3%) were vascular surgery trainees. 41 (49.4%) respondents performed 11-20 PVI cases under PSA every month, while 31 (41.0%) respondents performed 1-10 PVI cases under PSA every month. 41 (49.4%) respondents reported that in 1-10% of their cases, additional contrast and/or radiation was administered because patient moved on the table or did not cooperate with breath holds; 25 (30.1%) reported that this occurred in 11-20% of their cases, 12 (14.5%) reported that this occurred in 21-50% of their cases and 4 (4.8%) reported that this occurred in over 50% of their cases. In such cases, the majority of respondents reported a 1-10% increase in contrast volume (59.0%), radiation dosage (62.7%), sedative/analgesia administration (46.3%) and procedural time (54.9%). Of cases being converted to general anesthesia due to inadequate patient cooperation, 35 (42.2%) respondents reported between 1-5 per month, and 3 (3.6%) respondents reported between 6-10 per month. Of cases being aborted due to inadequate patient cooperation, 25 (30.1%) respondents reported between 1-5 per month, and 1 (1.2%) respondents reported between 6-10 per month. Conclusion A significant fraction of PVI cases performed under PSA result in increased radiation and contrast exposure, sedative administration and procedural time due to inadequate patient cooperation. In certain cases, conversion to general anesthesia or case abortion is required. Further research should be performed to investigate strategies to minimize such adverse patient safety events.
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Schmidt AP, Del Maschi MM, Andrade CF. Anesthetic management for lower extremity vascular bypass procedures: The impact of general or regional anesthesia on clinical outcomes. Vascular 2023:17085381231193492. [PMID: 37540895 DOI: 10.1177/17085381231193492] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 08/06/2023]
Abstract
PURPOSE Postoperative complications after major surgery, especially vascular procedures, are associated with a significant increase in costs and mortality. Previous studies evaluating general anesthesia versus regional or neuraxial anesthesia for infrainguinal bypass have produced conflicting results. The main aim of the present study is to review current evidence on the application of regional or general anesthesia in patients undergoing infrainguinal bypass surgery and its potential favorable effects on postoperative outcomes. CONTENTS Patients undergoing vascular surgery often have multiple comorbidities, and it is important to outline both benefits and risks of regional anesthesia techniques. Neuraxial anesthesia in vascular surgery allows overall avoidance of general anesthesia and does provide short-term benefits beyond analgesia. Previous observational studies suggest that neuraxial anesthesia for lower limb revascularization may reduce morbidity and length of stay. However, evidence of long-term benefits is lacking in most procedures and further work is still warranted. CONCLUSIONS Neuraxial anesthesia is usually an effective anesthesia technique for infrainguinal bypass surgery. Elderly patients and those with underlying respiratory problems may display some benefit from neuraxial anesthesia. Further evaluation within institutions should be performed to identify which patients would most benefit from regional techniques. Notably, systemic antithrombotic and anticoagulation therapy is common among this population and may affect anesthetic choices.
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Affiliation(s)
- André P Schmidt
- Serviço de Anestesia e Medicina Perioperatória, Hospital de Clínicas de Porto Alegre (HCPA), Porto Alegre, Brazil
- Departamento de Bioquímica, Instituto de Ciências Básicas da Saúde (ICBS), Universidade Federal do Rio Grande do Sul (UFRGS), Porto Alegre, Brazil
- Serviço de Anestesia, Santa Casa de Porto Alegre, Universidade Federal de Ciências da Saúde de Porto Alegre (UFCSPA), Porto Alegre, Brazil
- Serviço de Anestesia, Hospital Nossa Senhora da Conceição, Porto Alegre, Brazil
- Programa de Pós-graduação em Ciências Pneumológicas, Faculdade de Medicina, Universidade Federal do Rio Grande do Sul (UFRGS), Porto Alegre, Brazil
- Programa de Pós-Graduação em Anestesiologia, Ciências Cirúrgicas e Medicina Perioperatória, Faculdade de Medicina da Universidade de São Paulo (FMUSP), São Paulo, Brazil
| | - Marine M Del Maschi
- Serviço de Anestesia e Medicina Perioperatória, Hospital de Clínicas de Porto Alegre (HCPA), Porto Alegre, Brazil
| | - Cristiano F Andrade
- Programa de Pós-graduação em Ciências Pneumológicas, Faculdade de Medicina, Universidade Federal do Rio Grande do Sul (UFRGS), Porto Alegre, Brazil
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Kumar V. Current indications for spinal anesthesia-a narrative review. Best Pract Res Clin Anaesthesiol 2023; 37:89-99. [PMID: 37321771 DOI: 10.1016/j.bpa.2023.04.001] [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: 09/05/2022] [Revised: 03/14/2023] [Accepted: 04/05/2023] [Indexed: 06/17/2023]
Abstract
Spinal anesthesia is a commonly performed regional anesthesia technique by most anesthesiologists worldwide. This technique is learned early during training and is relatively easy to master. Despite being an old technique, spinal anesthesia has evolved and developed in various aspects. This review attempts to highlight the current indications of this technique. Understanding the finer aspects and knowledge gaps will help postgraduates and practicing anesthesiologists in designing patient-specific techniques and interventions.
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Affiliation(s)
- Vinoth Kumar
- Department of Anaesthesiology, Ganga Medical Centre and Hospitals Pvt Ltd, 313, Mettupalayam Road, Coimbatore, 641043, India.
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Li A, Dreksler H, Nagpal SK, Brandys T, Jetty P, Dubois L, Parsons Leigh J, Stelfox HT, McIsaac DI, Roberts DJ. Outcomes After Neuraxial or Regional Anaesthesia Instead of General Anaesthesia for Lower Limb Revascularisation Surgery: A Systematic Review and Meta-Analysis of Randomised and Non-Randomised Studies. Eur J Vasc Endovasc Surg 2023; 65:379-390. [PMID: 36336286 DOI: 10.1016/j.ejvs.2022.10.046] [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: 05/16/2022] [Revised: 10/19/2022] [Accepted: 10/30/2022] [Indexed: 11/06/2022]
Abstract
OBJECTIVE To determine whether receipt of neuraxial or regional anaesthesia instead of general anaesthesia for lower limb revascularisation surgery affects patient outcomes. DATA SOURCES MEDLINE, EMBASE, Evidence Based Medicine Reviews, and Google Scholar. REVIEW METHODS After protocol registration, the data sources were searched for randomised and non-randomised studies comparing neuraxial or regional anaesthesia with general anaesthesia for lower limb revascularisation surgery in adults. Two investigators independently selected articles, extracted data, and assessed risks of bias. Data were pooled using random effects models. GRADE was used to assess certainty in cumulative evidence. RESULTS From 10 755 citations identified, five randomised (n = 970) and 13 non-randomised (n = 96 800) studies were included. Use of neuraxial instead of general anaesthesia for lower limb revascularisation surgery was associated with no statistically significant reduction in short term (in hospital or 30 day) mortality in randomised studies (pooled odds ratio [OR] 0.77; 95% confidence interval [CI] 0.33 - 1.81; low certainty) and a statistically significant reduction in adjusted short term mortality in non-randomised studies (pooled OR 0.67; 95% CI 0.56 - 0.81; low certainty). Adults allocated to neuraxial anaesthesia in randomised studies had fewer pulmonary complications (pooled OR 0.35; 95% CI 0.16 - 0.76; low certainty). In non-randomised studies, neuraxial instead of general anaesthesia was associated with a lower adjusted odds of any morbidity (pooled OR 0.66; 95% CI 0.52 - 0.84), cardiac complications (pooled OR 0.68; 95% CI 0.58 - 0.79), pneumonia (pooled OR 0.81; 95% CI 0.64 - 1.02), prolonged mechanical ventilation (OR 0.09; 95% CI 0.002 - 0.55), and bypass graft thrombosis (OR 0.70; 95% CI 0.59 - 0.85), as well as a shorter operative duration (low certainty for all). Use of a nerve block instead of general anaesthesia was associated with a lower adjusted odds of delirium (OR 0.16; 95% CI 0.06 - 0.42) and a shorter operative duration (low certainty for both). CONCLUSION Randomised and non-randomised data suggest that neuraxial anaesthesia for lower limb revascularisation surgery reduces morbidity and possibly mortality. Until randomised trials with a low risk of bias become available, this study supports use of neuraxial anaesthesia for these procedures where appropriate.
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Affiliation(s)
- Allen Li
- Division of Vascular and Endovascular Surgery, Department of Surgery, University of Ottawa, Ottawa, Ontario, Canada
| | - Hannah Dreksler
- Division of Vascular and Endovascular Surgery, Department of Surgery, University of Ottawa, Ottawa, Ontario, Canada
| | - Sudhir K Nagpal
- Division of Vascular and Endovascular Surgery, Department of Surgery, University of Ottawa, Ottawa, Ontario, Canada; Clinical Epidemiology Program, The Ottawa Hospital Research Institute, The Ottawa Hospital, Ottawa, Ontario, Canada
| | - Timothy Brandys
- Division of Vascular and Endovascular Surgery, Department of Surgery, University of Ottawa, Ottawa, Ontario, Canada; Clinical Epidemiology Program, The Ottawa Hospital Research Institute, The Ottawa Hospital, Ottawa, Ontario, Canada
| | - Prasad Jetty
- Division of Vascular and Endovascular Surgery, Department of Surgery, University of Ottawa, Ottawa, Ontario, Canada; Clinical Epidemiology Program, The Ottawa Hospital Research Institute, The Ottawa Hospital, Ottawa, Ontario, Canada
| | - Luc Dubois
- Division of Vascular Surgery, Department of Surgery, Western University, London, Ontario, Canada; Department of Epidemiology and Biostatistics, Faculty of Medicine, Western University, London, Ontario, Canada; ICES, Ontario, Canada
| | - Jeanna Parsons Leigh
- School of Health Administration, Faculty of Health, Dalhousie University, Halifax, Nova Scotia, Canada
| | - Henry T Stelfox
- Department of Critical Care Medicine, University of Calgary and Alberta Health Services, Alberta, Canada; O'Brien Institute for Public Health, University of Calgary, Alberta, Canada
| | - Daniel I McIsaac
- Clinical Epidemiology Program, The Ottawa Hospital Research Institute, The Ottawa Hospital, Ottawa, Ontario, Canada; ICES, Ontario, Canada; Department of Anaesthesiology and Pain Medicine, University of Ottawa, Ottawa, Ontario, Canada; School of Epidemiology and Public Health, Faculty of Medicine, University of Ottawa, Ottawa, Ontario, Canada
| | - Derek J Roberts
- Division of Vascular and Endovascular Surgery, Department of Surgery, University of Ottawa, Ottawa, Ontario, Canada; Clinical Epidemiology Program, The Ottawa Hospital Research Institute, The Ottawa Hospital, Ottawa, Ontario, Canada; O'Brien Institute for Public Health, University of Calgary, Alberta, Canada; School of Epidemiology and Public Health, Faculty of Medicine, University of Ottawa, Ottawa, Ontario, Canada.
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Troisi N, Adami D, Piaggesi A, Canovaro F, Pieruzzi L, Torri L, Ferrari M, Berchiolli R. Non-reversed bifurcated vein graft improves time to healing in ischemic patients undergoing lower limb distal bypass. INT ANGIOL 2023; 42:1-8. [PMID: 36416199 DOI: 10.23736/s0392-9590.22.04952-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
Abstract
BACKGROUND Bifurcated vein grafts have been described in reconstructive microsurgery. No comparative studies have been published in lower limb arterial revascularization. The aim of this study was to compare non-reversed bifurcated vs. single vein graft in patients with critical limb-threatening ischemia (CLTI) undergoing lower limb distal bypass. METHODS Between January 2015 and December 2021 193 CLTI patients have been treated at our center with vein bypass, and distal anastomosis on infrapopliteal vessels; 137 patients (71%) received a single graft (Group SIN), and 56 patients (29%) had a bifurcated bypass (Group BIF). Primary outcomes measures were time to healing, primary patency, primary assisted patency, secondary patency, and limb salvage. Two-year outcomes according to Kaplan-Meier curves were evaluated and compared. RESULTS Both groups were homogeneous in terms of demographic data, preoperative risk factors, and clinical presentation except for an elderly age in Group BIF (77.5 vs. 71.5 years; P<0.001). Intraoperative technical success was achieved in all patients. Overall median duration of follow-up was 19 months (interquartile range 9-36). Wound healing did not differ between the two groups (77.4% Group SIN vs. 73.2% Group BIF; P=0.33). Mean time to healing was faster in Group BIF (2.4 vs. 6.8 months; P<0.001). At 2-year follow-up there were no differences between the two groups in terms of primary patency (71.4% Group SIN vs. 54% Group BIF; P=0.10), primary assisted patency (81.7% Group SIN vs. 76.4% Group BIF; P=0.53), secondary patency (85.1% Group SIN vs. 80.9% Group BIF; P=0.79), and limb salvage (92.3% Group SIN vs. 87.2% Group BIF; P=0.64). CONCLUSIONS Bifurcated graft improved time to healing in CLTI patients undergoing infrapopliteal non-reversed vein bypass. Two-year overall patencies and limb salvage did not differ accordingly to vein graft configuration (single vs. bifurcated).
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Affiliation(s)
- Nicola Troisi
- Unit of Vascular Surgery, Department of Translational Research and New Technologies in Medicine and Surgery, University of Pisa, Pisa, Italy -
| | - Daniele Adami
- Unit of Vascular Surgery, Department of Translational Research and New Technologies in Medicine and Surgery, University of Pisa, Pisa, Italy
| | - Alberto Piaggesi
- Section of Diabetic Foot, Department of Medicine, University of Pisa, Pisa, Italy
| | - Francesco Canovaro
- Unit of Vascular Surgery, Department of Translational Research and New Technologies in Medicine and Surgery, University of Pisa, Pisa, Italy
| | - Letizia Pieruzzi
- Section of Diabetic Foot, Department of Medicine, University of Pisa, Pisa, Italy
| | - Lorenzo Torri
- Unit of Vascular Surgery, Department of Translational Research and New Technologies in Medicine and Surgery, University of Pisa, Pisa, Italy
| | - Mauro Ferrari
- Unit of Vascular Surgery, Department of Translational Research and New Technologies in Medicine and Surgery, University of Pisa, Pisa, Italy
| | - Raffaella Berchiolli
- Unit of Vascular Surgery, Department of Translational Research and New Technologies in Medicine and Surgery, University of Pisa, Pisa, Italy
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Mølgaard J, Rasmussen SS, Eiberg J, Sørensen HBD, Meyhoff CS, Aasvang EK. Continuous wireless pre- and postoperative vital sign monitoring reveal new, severe desaturations after vascular surgery. Acta Anaesthesiol Scand 2023; 67:19-28. [PMID: 36267029 PMCID: PMC10092470 DOI: 10.1111/aas.14158] [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: 06/13/2022] [Revised: 09/20/2022] [Accepted: 10/17/2022] [Indexed: 12/29/2022]
Abstract
OBJECTIVES Postoperative deviating physiologic values (vital signs) may represent postoperative stress or emerging complications. But they can also reflect chronic preoperative values. Distinguishing between the two circumstances may influence the utility of using vital signs in patient monitoring. Thus, we aimed to describe the occurrence of vital sign deviations before and after major vascular surgery, hypothesising that preoperative vital sign deviations were longer in duration postoperatively. METHODS In this prospective observational study, arterial vascular patients were continuously monitored wirelessly - from the day before until 5 days after surgery. Recorded values were: heart rate, respiration rate, peripheral arterial oxygen saturation (SpO2 ) and blood pressure. The outcomes were 1. cumulative duration of SpO2 < 85% / 24 h, and 2. cumulative duration per 24 h of vital sign deviations. RESULTS Forty patients were included with a median monitoring time of 21 h preoperatively and 42 h postoperatively. The median duration of SpO2 < 85% preoperatively was 14.4 min/24 h whereas it was 28.0 min/24 h during day 0 in the ward (p = .09), and 16.8 min/24 h on day 1 in the ward (p = 0.61). Cumulative duration of SpO2 < 80% was significantly longer on day 0 in the ward 2.4 min/24 h (IQR 0.0-4.6) versus 6.7 min/24 h (IQR 1.8-16.2) p = 0.01. CONCLUSION Deviating physiology is common in patients before and after vascular surgery. A longer duration of severe desaturation was found on the first postoperative day in the ward compared to preoperatively, whereas moderate desaturations were reflected in postoperative desaturations. Cumulative duration outside thresholds is, in some cases, exacerbated after surgery.
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Affiliation(s)
- Jesper Mølgaard
- Department of Anaesthesiology, the Centre for Cancer and Organ Diseases, Copenhagen University Hospital - Rigshospitalet, Copenhagen, Denmark
| | - Søren Straarup Rasmussen
- Biomedical Signal Processing & AI Research Group, Digital Health Section, Department of Health Technology, Technical University of Denmark, Kgs. Lyngby, Denmark
| | - Jonas Eiberg
- Department of Vascular Surgery, the Heartcenter, Rigshospitalet, Copenhagen, Denmark.,Copenhagen Academy for Medical Education and Simulation (CAMES), Copenhagen, Denmark.,Department of Clinical Medicine, University of Copenhagen, Copenhagen, Denmark
| | - Helge Bjarup Dissing Sørensen
- Biomedical Signal Processing & AI Research Group, Digital Health Section, Department of Health Technology, Technical University of Denmark, Kgs. Lyngby, Denmark
| | - Christian Sylvest Meyhoff
- Department of Clinical Medicine, University of Copenhagen, Copenhagen, Denmark.,Department of Anaesthesia and Intensive Care, Copenhagen University Hospital - Bispebjerg and Frederiksberg Hospitals, Copenhagen, Denmark
| | - Eske Kvanner Aasvang
- Department of Anaesthesiology, the Centre for Cancer and Organ Diseases, Copenhagen University Hospital - Rigshospitalet, Copenhagen, Denmark.,Department of Clinical Medicine, University of Copenhagen, Copenhagen, Denmark
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9
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Lim JA, Seo Y, Choi EJ, Kwak SG, Ryu T, Lee JH, Park KH, Roh WS. Impact of regional anesthesia on outcomes of geriatric patients undergoing lower extremity revascularization: A propensity score-matched cohort study. Medicine (Baltimore) 2022; 101:e32597. [PMID: 36596067 PMCID: PMC9803409 DOI: 10.1097/md.0000000000032597] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/31/2022] Open
Abstract
Lower extremity revascularization (LER) for peripheral artery disease in elderly patients is associated with a high risk of perioperative morbidity and mortality. This study aimed to a conduct retrospective review and propensity score matching analysis to determine whether the use of regional anesthesia (RA) instead of general anesthesia (GA) in geriatric patients undergoing LER for peripheral artery disease results in improved short-term mortality and health outcomes. We reviewed medical records of 1271 patients aged >65 years who underwent LER at our center between May 1998 and February 2016. According to the anesthesia method, patients were grouped in the GA and RA groups. The primary outcome was short-term mortality (7-day and 30-day). The secondary outcomes were 5-year survival rate, intraoperative events, postoperative morbidity, and postoperative length of stay. A propensity score-matched cohort design was used to control for potentially confounding factors including patient demographics, comorbidities, American Society of Anesthesiologists physical status, and preoperative medications. After propensity score matching, 722 patients that received LER under GA (n = 269) or RA (n = 453) were identified. Patients from the GA group showed significantly higher 7-day mortality than those from the RA group (5.6% vs 2.7% P = .048); however, there was no significant difference in 30-day mortality between the groups (GA vs RA: 6.3% vs 3.6%, P = .083). The 5-year survival rate and incidence of arterial and central venous catheter placement or intraoperative dopamine and epinephrine use were significantly higher in the GA group than in the RA group (P < .05). In addition, the frequency of immediate postoperative oxygen therapy or mechanical ventilation support was higher in the GA group (P < .05). However, there was no difference in the postoperative cardiopulmonary and cerebral complications between the 2 groups. These results suggest that RA can reduce intraoperative hemodynamic support and provide immediate postoperative respiratory intensive care. In addition, the use of RA may be associated with better short-term and 5-year survival rates in geriatric patients undergoing LER.
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Affiliation(s)
- Jung A Lim
- Department of Anesthesiology and Pain Medicine, School of Medicine, Daegu Catholic University, Daegu, Republic of Korea
| | - Yohan Seo
- Department of Anesthesiology and Pain Medicine, School of Medicine, Daegu Catholic University, Daegu, Republic of Korea
| | - Eun-Joo Choi
- Department of Anesthesiology and Pain Medicine, School of Medicine, Daegu Catholic University, Daegu, Republic of Korea
| | - Sang Gyu Kwak
- Department of Medical Statistics, School of Medicine, Daegu Catholic University, Daegu, Republic of Korea
| | - Taeha Ryu
- Department of Anesthesiology and Pain Medicine, School of Medicine, Daegu Catholic University, Daegu, Republic of Korea
| | - Jae Hoon Lee
- Division of Vascular and Endovascular Surgery, Department of Surgery, School of Medicine, Daegu Catholic University, Daegu, Republic of Korea
| | - Ki Hyuk Park
- Division of Vascular and Endovascular Surgery, Department of Surgery, School of Medicine, Daegu Catholic University, Daegu, Republic of Korea
| | - Woon Seok Roh
- Department of Anesthesiology and Pain Medicine, School of Medicine, Daegu Catholic University, Daegu, Republic of Korea
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Ransford G, Feyzeau K, Noble M, Jones M, Byars D. Saphenous and sciatic nerve block to treat acute lower limb ischemic pain in the emergency department. J Ultrasound 2022; 25:979-981. [PMID: 35460505 PMCID: PMC9705610 DOI: 10.1007/s40477-021-00629-0] [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: 09/08/2021] [Accepted: 09/26/2021] [Indexed: 10/18/2022] Open
Abstract
Acute limb ischemia (ALI) presents with significant pain that is often refractory to opioid pain management or is present in patients with relative contraindications to opioids. Here we present a case of ALI successfully managed with regional anesthesia using sciatic and saphenous nerve blocks. To our knowledge, this is the first case report of regional anesthesia for ALI performed in the Emergency Department (ED) by Emergency Medicine physicians.
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Affiliation(s)
- Gabrielle Ransford
- Eastern Virignia Medical School, Department of Emergency Medicine, 600 Gresham Drive, Suite 304 Raleigh Building, Norfolk, VA, 23507, USA
| | - Kean Feyzeau
- Eastern Virignia Medical School, Department of Emergency Medicine, 600 Gresham Drive, Suite 304 Raleigh Building, Norfolk, VA, 23507, USA
| | - Mark Noble
- Eastern Virignia Medical School, Department of Emergency Medicine, 600 Gresham Drive, Suite 304 Raleigh Building, Norfolk, VA, 23507, USA
| | - Matthew Jones
- Eastern Virignia Medical School, Department of Emergency Medicine, 600 Gresham Drive, Suite 304 Raleigh Building, Norfolk, VA, 23507, USA
| | - Donald Byars
- Eastern Virignia Medical School, Department of Emergency Medicine, 600 Gresham Drive, Suite 304 Raleigh Building, Norfolk, VA, 23507, USA.
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Tomas VG, Hollis N, Ouanes JPP. Regional Anesthesia for Vascular Surgery and Pain Management. Anesthesiol Clin 2022; 40:751-773. [PMID: 36328627 DOI: 10.1016/j.anclin.2022.08.016] [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] [Indexed: 06/16/2023]
Abstract
Patients undergoing vascular surgery tend to have significant systemic comorbidities. Vascular surgery itself is also associated with greater cardiac morbidity and overall mortality than other types of noncardiac surgery. Regional anesthesia is amenable as the primary anesthetic technique for vascular surgery or as an adjunct to general anesthesia. When used as the primary anesthetic, regional anesthesia techniques avoid complications associated with general anesthesia in this challenging patient population. In this article, the authors describe regional anesthetic techniques for carotid endarterectomy, arteriovenous fistula creation, lower extremity bypass surgery, and amputation.
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Affiliation(s)
- Vicente Garcia Tomas
- Department of Anesthesiology, Regional Anesthesia and Acute Pain Medicine, Northwestern University Feinberg School of Medicine Chicago, 251 E. Huron St F5-704, Chicago, IL 60611, USA.
| | - Nicole Hollis
- Department of Anesthesiology, West Virginia University, 1 Medical Center Drive PO Box 8255, Morgantown, WV 26508, USA
| | - Jean-Pierre P Ouanes
- Cornell Medicine, Hospital for Special Surgery, Florida, 300 Palm Beach Lakes Boulevard, West Palm Beach, FL 33401, USA
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Roberts DJ, Mor R, Rosen MN, Talarico R, Lalu MM, Jerath A, Wijeysundera DN, McIsaac DI. Hospital-, Anesthesiologist-, Surgeon-, and Patient-Level Variations in Neuraxial Anesthesia Use for Lower Limb Revascularization Surgery: A Population-Based Cross-Sectional Study. Anesth Analg 2022; 135:1282-1292. [PMID: 36219577 DOI: 10.1213/ane.0000000000006232] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
Abstract
BACKGROUND Although neuraxial anesthesia may promote improved outcomes for patients undergoing lower limb revascularization surgery, its use is decreasing over time. Our objective was to estimate variation in neuraxial (versus general) anesthesia use for lower limb revascularization at the hospital, anesthesiologist, surgeon, and patient levels, which could inform strategies to increase uptake. METHODS Following protocol registration, we conducted a historical cross-sectional analysis of population-based linked health administrative data in Ontario, Canada. All adults undergoing lower limb revascularization surgery between 2009 and 2018 were identified. Generalized linear models with binomial response distributions, logit links and random intercepts for hospitals, anesthesiologists, and surgeons were used to estimate the variation in neuraxial anesthesia use at the hospital, anesthesiologist, surgeon, and patient levels using variance partition coefficients and median odds ratios. Patient- and hospital-level predictors of neuraxial anesthesia use were identified. RESULTS We identified 11,849 patients; 3489 (29.4%) received neuraxial anesthesia. The largest proportion of variation was attributable to the hospital level (50.3%), followed by the patient level (35.7%); anesthesiologists and surgeons had small attributable variation (11.3% and 2.8%, respectively). Mean odds ratio estimates suggested that 2 similar patients would experience a 5.7-fold difference in their odds of receiving a neuraxial anesthetic were they randomly sent to 2 different hospitals. Results were consistent in sensitivity analyses, including limiting analysis to patients with diagnosed peripheral artery disease and separately to those aged >66 years with complete prescription anticoagulant and antiplatelet usage data. CONCLUSIONS Neuraxial anesthesia use primarily varies at the hospital level. Efforts to promote use of neuraxial anesthesia for lower limb revascularization should likely focus on the hospital context.
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Affiliation(s)
- Derek J Roberts
- From the Department of Surgery, Divisions of Vascular and Endovascular Surgery, The Ottawa Hospital and the University of Ottawa, Ottawa, Ontario, Canada.,School of Epidemiology & Public Health, University of Ottawa, Ottawa, Ontario, Canada.,Clinical Epidemiology Program, Ottawa Hospital Research Institute, Ottawa, Ontario, Canada.,The O'Brien Institute of Public Health, University of Calgary, Calgary, AB, Canada
| | - Rahul Mor
- Faculty of Medicine, University of Ottawa, Ottawa, Ontario, Canada
| | - Michael N Rosen
- Faculty of Medicine, University of Ottawa, Ottawa, Ontario, Canada
| | | | - Manoj M Lalu
- Clinical Epidemiology Program, Ottawa Hospital Research Institute, Ottawa, Ontario, Canada.,Departments of Anesthesiology & Pain Medicine, The Ottawa Hospital and the University of Ottawa, Ottawa, Ontario, Canada
| | - Angela Jerath
- ICES, Toronto, Ontario, Canada.,Department of Anesthesiology and Pain Medicine, University of Toronto, Toronto, Ontario, Canada.,Sunnybrook Research Institute, Department of Anesthesia, Sunnybrook Health Sciences Centre, Toronto, Ontario, Canada.,Institute of Health Policy, Management and Evaluation, University of Toronto, Toronto, Ontario, Canada
| | - Duminda N Wijeysundera
- ICES, Toronto, Ontario, Canada.,Department of Anesthesiology and Pain Medicine, University of Toronto, Toronto, Ontario, Canada.,Institute of Health Policy, Management and Evaluation, University of Toronto, Toronto, Ontario, Canada.,Department of Anesthesia, St Michael's Hospital, Toronto, Ontario, Canada.,Li Ka Shing Knowledge Institute, St. Michael's Hospital, Toronto, Ontario, Canada
| | - Daniel I McIsaac
- School of Epidemiology & Public Health, University of Ottawa, Ottawa, Ontario, Canada.,Clinical Epidemiology Program, Ottawa Hospital Research Institute, Ottawa, Ontario, Canada.,ICES, Toronto, Ontario, Canada.,Departments of Anesthesiology & Pain Medicine, The Ottawa Hospital and the University of Ottawa, Ottawa, Ontario, Canada
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13
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Gunawardena M, Salami M, Howard A, Awupetu A. Does the Mode of Anaesthesia (General or Regional) Affect Survival and Complications Following Femoropopliteal and Femorodistal Bypass? Cureus 2022; 14:e32104. [DOI: 10.7759/cureus.32104] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 12/01/2022] [Indexed: 12/04/2022] Open
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14
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Ke JXC, Flexman AM, Schwarz SKW, MacDonald S, Prabhakar C. OUP accepted manuscript. BJS Open 2022; 6:6601280. [PMID: 35657135 PMCID: PMC9164863 DOI: 10.1093/bjsopen/zrac061] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/06/2022] [Accepted: 04/07/2022] [Indexed: 11/25/2022] Open
Abstract
Background The relationship between anaesthetic technique and graft patency after open lower limb revascularization is unclear. The aim of this study was to evaluate the association between 30-day graft patency after elective infrainguinal bypass and anaesthetic technique (regional anaesthesia (RA, i.e. neuraxial and/or peripheral nerve blockade) compared with general anaesthesia (GA)). Methods Patients who underwent elective infrainguinal bypass in the 2014–2019 National Surgical Quality Improvement Program Vascular Procedure Targeted Lower Extremity Open data set were included. Excluded patients were those under 18 years old, those who did not receive RA or GA, and/or had an international normalized ratio of 1.5 of greater, a partial thromboplastin time more than 35 s, or a platelet count less than 80 × 109/L. The primary outcome was primary graft patency without reintervention. The relationship between anaesthetic technique and patency was analysed with multivariable logistic regression. Results Included were 8893 patients with a mean(s.d.) age of 68(11) years and 31.5 per cent female. Within the cohort, 7.7 per cent (n = 688) patients received RA only, 90.4 per cent (n = 8039) GA only, and 1.9 per cent (n = 166) both GA and RA. In the RA-only group, 91.7 per cent (631 of 688) received neuraxial anaesthesia. The primary patency rate was 93.2 per cent (573 of 615) for RA only, and 91.5 per cent (6390 of 6983) for GA only (standardized mean difference, 0.063). RA was not associated with a higher rate of patency compared with GA (adjusted OR, 1.16; 95 per cent c.i., 0.83 to 1.63; P = 0.378). Conclusion There was no association between anaesthetic technique and 30-day graft patency after elective infrainguinal bypass surgery. Further prospective studies would be useful to study the impact of anaesthesia technique on important patient-centred outcomes such as long-term patency and non-home discharge.
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Affiliation(s)
- Janny Xue Chen Ke
- Correspondence to: Janny Xue Chen Ke, 1081 Burrard Street, Vancouver, British Columbia V6Z1Y6, Canada (e-mail: ; @jannyke
| | - Alana M. Flexman
- Department of Anesthesia, St. Paul’s Hospital, Providence Health Care, Vancouver, British Columbia, Canada
- Department of Anesthesiology, Pharmacology & Therapeutics, University of British Columbia, Vancouver, British Columbia, Canada
| | - Stephan K. W. Schwarz
- Department of Anesthesia, St. Paul’s Hospital, Providence Health Care, Vancouver, British Columbia, Canada
- Department of Anesthesiology, Pharmacology & Therapeutics, University of British Columbia, Vancouver, British Columbia, Canada
| | - Shaun MacDonald
- Division of Vascular Surgery, St. Paul’s Hospital, The University of British Columbia, Vancouver, British Columbia, Canada
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Roberts DJ, Dreksler H, Nagpal SK, Li A, Parsons Leigh J, Brandys T, Jetty P, Dubois L, Stelfox HT, McIsaac DI. Outcomes After Receipt of Neuraxial or Regional Anesthesia Instead of General Anesthesia for Lower Limb Revascularization Surgery: Protocol for a Systematic Review and Meta-analysis. JMIR Res Protoc 2021; 10:e32170. [PMID: 34507273 PMCID: PMC8665382 DOI: 10.2196/32170] [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: 07/16/2021] [Revised: 09/07/2021] [Accepted: 09/08/2021] [Indexed: 11/13/2022] Open
Abstract
BACKGROUND Patients undergoing lower limb revascularization surgery for peripheral artery disease (PAD) have a high risk of perioperative morbidity and mortality and often have long hospital stays. Use of neuraxial or regional anesthesia instead of general anesthesia may represent one approach to improving outcomes and reducing resource use among these patients. OBJECTIVE The aim is to conduct a systematic review and meta-analysis to determine whether receipt of neuraxial or regional anesthesia instead of general anesthesia in adults undergoing lower limb revascularization surgery for PAD results in improved health outcomes and costs and a shorter length of hospitalization. METHODS We will search electronic bibliographic databases (MEDLINE, EMBASE, the seven databases in Evidence-Based Medicine Reviews, medRxiv, bioRxiv, and Google Scholar), review papers identified during the search, and included article bibliographies. We will include randomized and nonrandomized studies comparing the use of neuraxial or regional anesthesia instead of general anesthesia in adults undergoing lower limb revascularization surgery for PAD. Two investigators will independently evaluate the risk of bias. The primary outcome will be short-term (in-hospital or 30-day) mortality. Secondary outcomes will include longer-term mortality; major adverse cardiovascular, pulmonary, renal, and limb events; delirium; deep vein thrombosis or pulmonary embolism; neuraxial or regional anesthesia-related complications; graft-related outcomes; length of operation and hospital stay; costs; and patient-reported or functional outcomes. We will calculate summary odds ratios (ORs) and standardized mean differences (SMDs) using random-effects models. Heterogeneity will be explored using stratified meta-analyses and meta-regression. We will assess for publication bias using the Begg and Egger tests and use the trim-and-fill method to estimate the potential influence of this bias on summary estimates. Finally, we will use Grading of Recommendations, Assessment, Development, and Evaluation (GRADE) methodology to make an overall rating of the quality of evidence in our effect estimates. RESULTS The protocol was registered in the International Prospective Register of Systematic Reviews (PROSPERO). We executed the peer-reviewed search strategy on March 2, 2021. We completed the review of titles and abstracts on July 30, 2021, and plan to complete the review of full-text papers by September 30, 2021. We will complete full-text study data extraction and the risk-of-bias assessment by November 15, 2021, and conduct qualitative and then quantitative data synthesis and GRADE assessment of results by January 1, 2022, before drafting the manuscript. We anticipate that we will be able to submit the manuscript for peer review by the end of February 2022. CONCLUSIONS This study will synthesize existing evidence regarding whether receipt of neuraxial or regional anesthesia instead of general anesthesia in adults undergoing lower limb revascularization surgery for PAD results in improved health outcomes, graft patency, and costs and a shorter length of hospital stay. Study results will be used to inform practice and future research, including creation of a pilot and then multicenter randomized controlled trial. TRIAL REGISTRATION Prospero CRD42021237060; https://www.crd.york.ac.uk/prospero/display_record.php?RecordID=237060. INTERNATIONAL REGISTERED REPORT IDENTIFIER (IRRID) PRR1-10.2196/32170.
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Affiliation(s)
- Derek J Roberts
- Division of Vascular and Endovascular Surgery, Department of Surgery, University of Ottawa, Ottawa, ON, Canada
- Clinical Epidemiology Program, Ottawa Hospital Research Institute, Ottawa Hospital, Ottawa, ON, Canada
| | - Hannah Dreksler
- Division of Vascular and Endovascular Surgery, Department of Surgery, University of Ottawa, Ottawa, ON, Canada
| | - Sudhir K Nagpal
- Division of Vascular and Endovascular Surgery, Department of Surgery, University of Ottawa, Ottawa, ON, Canada
| | - Allen Li
- Division of Vascular and Endovascular Surgery, Department of Surgery, University of Ottawa, Ottawa, ON, Canada
| | - Jeanna Parsons Leigh
- School of Health Administration, Faculty of Health, Dalhousie University, Halifax, NS, Canada
| | - Timothy Brandys
- Division of Vascular and Endovascular Surgery, Department of Surgery, University of Ottawa, Ottawa, ON, Canada
| | - Prasad Jetty
- Division of Vascular and Endovascular Surgery, Department of Surgery, University of Ottawa, Ottawa, ON, Canada
| | - Luc Dubois
- Division of Vascular Surgery, Department of Surgery, Western University, London, ON, Canada
- Department of Epidemiology and Biostatistics, Faculty of Medicine, Western University, London, ON, Canada
| | - Henry T Stelfox
- Department of Critical Care Medicine, University of Calgary, Calgary, AB, Canada
- O'Brien Institute for Public Health, University of Calgary, Calgary, AB, Canada
| | - Daniel I McIsaac
- Clinical Epidemiology Program, Ottawa Hospital Research Institute, Ottawa Hospital, Ottawa, ON, Canada
- Department of Anesthesiology and Pain Medicine, University of Ottawa, Ottawa, ON, Canada
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Boyd S, Dittman JM, Tse W, Lavingia KS, Amendola MF. Modern Lower Extremity Bypass Outcomes by Anesthesia Type in the Veteran Population. Ann Vasc Surg 2021; 80:187-195. [PMID: 34673178 DOI: 10.1016/j.avsg.2021.08.028] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/07/2021] [Revised: 08/02/2021] [Accepted: 08/02/2021] [Indexed: 11/01/2022]
Abstract
BACKGROUND Lower extremity bypass (LEB) revascularization can be performed under general (GA) or neuraxial anesthesia (NA). Studies show that the use of NA may decrease morbidity, 30-day mortality, and hospital length-of-stay (LOS). The goal of our analysis is to examine the differences in postsurgical outcomes following LEB between patients who undergo GA compared to NA in the Veteran Affairs Surgical Quality Improvement Program (VASQIP) database. METHODS After IRB approval, the VASQIP database was assessed for patients who underwent LEB between 1998-2018. Only infrainguinal bypass procedures and anesthesia type classified as "general," "epidural," or "spinal" were included. The neuraxial cohort includes both spinal and epidural anesthesia patients. The Risk Analysis Index (RAI), a validated measure of frailty, was additionally calculated for each patient. Chi squared, paired t-test, and binary logistic regression were used to compare the cohorts. RESULTS During this period, 22,960 veterans underwent LEB recorded in VASQIP. Compared to those who underwent surgery under GA, patients with procedures performed using NA were older (66.4 ± 9.6 years vs. 65.3 ± 9 years respectively; P <0.001) and more frail (average RAI score 25.7 ± 7.0 vs. 24.9 ± 6.7; P < 0.001). Operative time was shorter in the NA group (4.1 ± 1.7 hrs vs. 4.7 ± 3.0 hrs; P < 0.001) and fewer cases were emergent (1.55% vs. 4.13%; P <0.001). Patients in the GA group had higher rates of postoperative prolonged ileus (0.31% vs. 0.00%; P = 0.03), pneumonia (1.60% vs. 1.06%; P = 0.025), deep wound infection (2.67% vs. 2.61%; P = 0.01), sepsis (1.68% vs. 0.79%; P < 0.001), reintubation (1.80% vs. 1.30%) (P = 0.04),and number of packed red blood cell (pRBC) transfused intraoperatively (0.39 ± 1.21 units vs. 0.22 ± 0.79 units; P <0.001). There was no significant difference in rate of graft failure, return to the OR, myocardial infarction, death, or LOS. In regression analysis, those undergoing NA were less likely to require pRBC transfusion intraoperatively (OR: 0.43; 95% CI: 0.31-0.61; P < 0.001), however no other outcomes reached statistical significance. CONCLUSION Although younger and less frail, veteran patients undergoing GA for lower extremity revascularization had higher rates of postoperative ileus, pneumonia, deep wound infection, sepsis, and need for transfusion as compared to those undergoing NA. There was no significant difference in the rate of other major complications, myocardial infarction, death or LOS. After adjustment, only intraoperative transfusion remained statistically significant, likely reflecting longer and more complex cases for those that undergo general anesthesia rather than the effect of anesthetic choice itself.
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Affiliation(s)
- Sally Boyd
- Division of Vascular and Endovascular Surgery, Virginia Commonwealth University Health System, Richmond, VA; Division of Vascular and Endovascular Surgery, Central Virginia Veterans Administration Health System, Richmond, VA
| | - James M Dittman
- Virginia Commonwealth University School of Medicine, Richmond, VA
| | - Wayne Tse
- Division of Vascular and Endovascular Surgery, Virginia Commonwealth University Health System, Richmond, VA; Division of Vascular and Endovascular Surgery, Central Virginia Veterans Administration Health System, Richmond, VA
| | - Kedar S Lavingia
- Division of Vascular and Endovascular Surgery, Virginia Commonwealth University Health System, Richmond, VA; Division of Vascular and Endovascular Surgery, Central Virginia Veterans Administration Health System, Richmond, VA; Virginia Commonwealth University School of Medicine, Richmond, VA.
| | - Michael F Amendola
- Division of Vascular and Endovascular Surgery, Central Virginia Veterans Administration Health System, Richmond, VA; Virginia Commonwealth University School of Medicine, Richmond, VA
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Perioperative Care of Patients at High Risk for Stroke During or After Non-cardiac, Non-neurological Surgery: 2020 Guidelines From the Society for Neuroscience in Anesthesiology and Critical Care. J Neurosurg Anesthesiol 2021; 32:210-226. [PMID: 32433102 DOI: 10.1097/ana.0000000000000686] [Citation(s) in RCA: 31] [Impact Index Per Article: 10.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
Perioperative stroke is associated with considerable morbidity and mortality. Stroke recognition and diagnosis are challenging perioperatively, and surgical patients receive therapeutic interventions less frequently compared with stroke patients in the outpatient setting. These updated guidelines from the Society for Neuroscience in Anesthesiology and Critical Care provide evidence-based recommendations regarding perioperative care of patients at high risk for stroke. Recommended areas for future investigation are also proposed.
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Mamatkulov M, Naumov N, Kurianov P, Yaroslavsky A, Sergeev A, Voronova A. Infrainguinal bypass under triple nerve block in patients with severely compromised left ventricular ejection fraction and chronic limb-threatening ischemia. JOURNAL OF VASCULAR SURGERY CASES INNOVATIONS AND TECHNIQUES 2021; 7:450-453. [PMID: 34278082 PMCID: PMC8263527 DOI: 10.1016/j.jvscit.2021.05.004] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Subscribe] [Scholar Register] [Received: 03/09/2021] [Accepted: 05/06/2021] [Indexed: 11/29/2022]
Abstract
A severely compromised left ventricular ejection fraction (LVEF) is a major limitation for lower extremity bypass reconstruction both under general anesthesia or neuraxial anesthesia (NA). A series of eight infrainguinal bypass procedures were performed under peripheral nerve block in five patients (three males and two females; median age, 67 years) with chronic limb-threatening ischemia and a preoperative LVEF of 35% or less (median, 27%; range, 20%-35%). There were no conversions to neuraxial anesthesia/general anesthesia or early postoperative complications. This study showed that open infrainguinal reconstructions can be performed safely under peripheral nerve blockade in this vulnerable category of patients.
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Affiliation(s)
- Muzafar Mamatkulov
- Department of Vascular Surgery, Railway Clinical Hospital, Yaroslavl, Russia
| | - Nikolai Naumov
- Department of Vascular Surgery, Railway Clinical Hospital, Yaroslavl, Russia
| | - Pavel Kurianov
- Center on Diabetic Foot and Surgical Infection, St.-George's Hospital, Saint Petersburg, Russia
| | - Alexey Yaroslavsky
- Department of Vascular Surgery, Railway Clinical Hospital, Yaroslavl, Russia
| | - Alexey Sergeev
- Department of Anesthesia and Critical Care, Railway Clinical Hospital, Yaroslavl, Russia
| | - Anastasia Voronova
- Department of Vascular Surgery, Railway Clinical Hospital, Yaroslavl, Russia
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Abstract
Stroke is associated with substantial morbidity and mortality. The aim of this review is to provide an evidence-based synthesis of the literature related to perioperative stroke, including its etiology, common risk factors, and potential risk reduction strategies. In addition, the authors will discuss screening methods for the detection of postoperative cerebral ischemia and how multidisciplinary collaborations, including endovascular interventions, should be considered to improve patient outcomes. Lastly, the authors will discuss the clinical and scientific knowledge gaps that need to be addressed to reduce the incidence and improve outcomes after perioperative stroke.
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General Versus Neuraxial Anesthesia for Appendectomy: A Multicenter International Study. World J Surg 2021; 45:3295-3301. [PMID: 33554296 DOI: 10.1007/s00268-021-05978-9] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 01/10/2021] [Indexed: 10/22/2022]
Abstract
BACKGROUND In resource-limited countries, open appendectomy is still performed under general anesthesia (GA) or neuraxial anesthesia (NA). We sought to compare the postoperative outcomes of appendectomy under NA versus GA. METHODS We conducted a post hoc analysis of the International Patterns of Opioid Prescribing (iPOP) multicenter study. All patients ≥ 16 years-old who underwent an open appendectomy between October 2016 and March 2017 in one of the 14 participating hospitals were included. Patients were stratified into two groups: NA-defined as spinal or epidural-and GA. All-cause morbidity, hospital length of stay (LOS), and pain severity were assessed using univariate analysis followed by multivariable logistic regression adjusting for the following preoperative characteristics: age, gender, body mass index (BMI), smoking, history of opioid use, emergency status, and country. RESULTS A total of 655 patients were included, 353 of which were in the NA group and 302 in the GA group. The countries operating under NA were Colombia (39%), Thailand (31%), China (23%), and Brazil (7%). Overall, NA patients were younger (mean age (SD): 34.5 (14.4) vs. 40.7 (17.9), p-value < 0.001) and had a lower BMI (mean (SD): 23.5 (3.8) vs. 24.3 (5.2), p-value = 0.040) than GA patients. On multivariable analysis, NA was independently associated with less postoperative complications (OR, 95% CI: 0.30 [0.10-0.94]) and shorter hospital LOS (LOS > 3 days, OR, 95% CI: 0.47 [0.32-0.68]) compared to GA. There was no difference in postoperative pain severity between the two techniques. CONCLUSIONS Open appendectomy performed under NA is associated with improved outcomes compared to that performed under GA. Further randomized controlled studies should examine the safety and value of NA in lower abdominal surgery.
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Bisgaard J, Torp-Pedersen C, Rasmussen BS, Houlind KC, Riddersholm SJ. Editor's Choice - Regional Versus General Anaesthesia in Peripheral Vascular Surgery: a Propensity Score Matched Nationwide Cohort Study of 17 359 Procedures in Denmark. Eur J Vasc Endovasc Surg 2021; 61:430-438. [PMID: 33358100 DOI: 10.1016/j.ejvs.2020.11.025] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/13/2020] [Revised: 11/03/2020] [Accepted: 11/17/2020] [Indexed: 12/14/2022]
Abstract
OBJECTIVE Cardiopulmonary comorbidity is common in vascular surgery. General anaesthesia (GA) may impair perfusion and induce respiratory depression. Regional anaesthesia (RA), including neuraxial or peripheral nerve blocks, may therefore be associated with a better outcome. METHODS This was a nationwide retrospective cohort study. All open inguinal and infra-inguinal arterial surgical reconstructions from 2005 to 2017 were included. Data were extracted from national registries. Multivariable linear and logistic regression models and propensity score matching were used. The propensity score was derived by developing a model that predicted the probability that a given patient would receive GA based on age, comorbidity, anticoagulant medication, procedure type, and the urgency of surgery. Matching was performed in four groups based on American Society of Anesthesiologists' score I - II, score III - V, and gender. Outcome parameters included surgical and general complications (bleeding, thrombosis/embolus, cardiac, pulmonary, renal, cerebral, and >3 days intensive care therapy), length of stay, and 30 day mortality, hypothesising a better outcome after RA. RESULTS There were 10 509 procedures in the GA group and 6 850 in the RA group. After propensity score matching, 6 267 procedures were included in each group. Surgical and general complications were significantly more common after GA in both matched (3.8 vs. 2.5%, p < .001 and 6.5 vs. 4.2%, p < .001) and unmatched analyses (3.8 vs. 2.5%, p < .001 and 6.5 vs. 4.2%, p < .001). The 30 day mortality rate was significantly higher after GA, in matched and un matched analyses (3.1 vs. 2.4%, p = .019 and 4.1 vs. 2.4%, p < .001). There was no difference in length of stay. CONCLUSION RA may be associated with a better outcome, compared with GA, after open inguinal and infra-inguinal peripheral vascular surgery. In the clinical context when RA is not feasible, GA can still be considered safe.
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Affiliation(s)
- Jannie Bisgaard
- Department of Anaesthesiology and Intensive Care, Aalborg University Hospital, Aalborg, Denmark; Department of Clinical Medicine, Aalborg University, Aalborg, Denmark.
| | | | - Bodil S Rasmussen
- Department of Anaesthesiology and Intensive Care, Aalborg University Hospital, Aalborg, Denmark; Department of Clinical Medicine, Aalborg University, Aalborg, Denmark
| | - Kim C Houlind
- Department of Vascular Surgery, Lillebælt Hospital, Kolding, Denmark; Department of Regional Health Research, University of Southern Denmark, Kolding, Denmark
| | - Signe J Riddersholm
- Department of Internal Medicine, Randers Regional Hospital, Randers, Denmark
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Roberts DJ, Nagpal SK, Kubelik D, Brandys T, Stelfox HT, Lalu MM, Forster AJ, McCartney CJ, McIsaac DI. Association between neuraxial anaesthesia or general anaesthesia for lower limb revascularisation surgery in adults and clinical outcomes: population based comparative effectiveness study. BMJ 2020; 371:m4104. [PMID: 33239330 PMCID: PMC7687020 DOI: 10.1136/bmj.m4104] [Citation(s) in RCA: 20] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
Abstract
OBJECTIVE To examine the associations between neuraxial anaesthesia or general anaesthesia and clinical outcomes, length of hospital stay, and readmission in adults undergoing lower limb revascularisation surgery. DESIGN Comparative effectiveness study using linked, validated, population based databases. SETTING Ontario, Canada, 1 April 2002 to 31 March 2015. PARTICIPANTS 20 988 patients Ontario residents aged 18 years or older who underwent their first lower limb revascularisation surgery in hospitals performing 50 or more of these surgeries annually. MAIN OUTCOME MEASURES Primary outcome was 30 day all cause mortality. Secondary outcomes were in-hospital cardiopulmonary and renal complications, length of hospital stay, and 30 day readmissions. Multivariable, mixed effects regression models, adjusting for patient, procedural, and hospital characteristics, were used to estimate associations between anaesthetic technique and outcomes. Robustness of analyses were evaluated by conducting instrumental variable, propensity score matched, and survival sensitivity analyses. RESULTS Of 20 988 patients who underwent lower limb revascularisation surgery, 6453 (30.7%) received neuraxial anaesthesia and 14 535 (69.3%) received general anaesthesia. The percentage of neuraxial anaesthesia use ranged from 0.6% to 90.6% across included hospitals. Furthermore, use of neuraxial anaesthesia declined by 17% over the study period. Death within 30 days occurred in 204 (3.2%) patients who received neuraxial anaesthesia and 646 (4.4%) patients who received general anaesthesia. After multivariable, multilevel adjustment, use of neuraxial anaesthesia compared with use of general anaesthesia was associated with decreased 30 day mortality (absolute risk reduction 0.72%, 95% confidence interval 0.65% to 0.79%; odds ratio 0.68, 95% confidence interval 0.57 to 0.83; number needed to treat to prevent one death=139). A similar direction and magnitude of association was found in instrumental variable, propensity score matched, and survival analyses. Use of neuraxial anaesthesia compared with use of general anaesthesia was also associated with decreased in-hospital cardiopulmonary and renal complications (odds ratio 0.73, 0.63 to 0.85) and a reduced length of hospital stay (-0.5 days, -0.3 to-0.6 days). CONCLUSIONS Use of neuraxial anaesthesia compared with general anaesthesia for lower limb revascularisation surgery was associated with decreased 30 day mortality and hospital length of stay. These findings might have been related to reduced cardiopulmonary and renal complications after neuraxial anaesthesia and support the increased use of neuraxial anaesthesia in patients undergoing these surgeries until the results of a large, confirmatory randomised trial become available.
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Affiliation(s)
- Derek J Roberts
- Division of Vascular and Endovascular Surgery, Department of Surgery, University of Ottawa and The Ottawa Hospital, Ottawa, ON, Canada
| | - Sudhir K Nagpal
- Division of Vascular and Endovascular Surgery, Department of Surgery, University of Ottawa and The Ottawa Hospital, Ottawa, ON, Canada
| | - Dalibor Kubelik
- Division of Vascular and Endovascular Surgery, Department of Surgery, University of Ottawa and The Ottawa Hospital, Ottawa, ON, Canada
| | - Timothy Brandys
- Division of Vascular and Endovascular Surgery, Department of Surgery, University of Ottawa and The Ottawa Hospital, Ottawa, ON, Canada
| | - Henry T Stelfox
- Department of Critical Care Medicine and O'Brien Institute for Public Health University of Calgary, Foothills Medical Centre, Calgary, AB, Canada
| | - Manoj M Lalu
- Department of Anesthesiology and Pain Medicine, University of Ottawa and The Ottawa Hospital, 1053 Carling Avenue, Ottawa, ON, Canada, K1Y 4E9
| | - Alan J Forster
- Department of Medicine, Ottawa Hospital, Ottawa, ON, Canada
| | - Colin Jl McCartney
- Department of Anesthesiology and Pain Medicine, University of Ottawa and The Ottawa Hospital, 1053 Carling Avenue, Ottawa, ON, Canada, K1Y 4E9
| | - Daniel I McIsaac
- Department of Anesthesiology and Pain Medicine, University of Ottawa and The Ottawa Hospital, 1053 Carling Avenue, Ottawa, ON, Canada, K1Y 4E9
- Ottawa Hospital Research Institute, Ottawa, ON, Canada
- School of Epidemiology and Public Health, University of Ottawa, Ottawa, ON, Canada
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23
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Chen S, Xu Z, Liu H, Zhang Y, Zhang J, Chen Y, Zheng Y, Huang Y. Perioperative patient-controlled regional analgesia versus patient-controlled intravenous analgesia for patients with critical limb ischaemia: a study protocol for a randomised controlled trial. BMJ Open 2020; 10:e037879. [PMID: 33033091 PMCID: PMC7545635 DOI: 10.1136/bmjopen-2020-037879] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/03/2022] Open
Abstract
INTRODUCTION Both regional analgesia and intravenous analgesia are frequently used perioperatively for patients with critical limb ischaemia (CLI). Nevertheless, the comparison of perioperative effect of regional and intravenous analgesia has not yet been thoroughly illustrated. This study will comprehensively compare patient-controlled regional analgesia (PCRA) and patient-controlled intravenous analgesia (PCIA) as two different perioperative analgesia approaches for patients with CLI. It investigates their effects on analgesia, reperfusion and the quality of recovery perioperatively, also aims to provide clinical evidence to those non-surgical patients with non-reconstructable arteries. METHODS AND ANALYSIS This trial is a randomised, single-centre, open-label, parallel trial with target sample size of 52 in total. Eligible participants will be randomly allocated to the PCRA group (group R) or the PCIA group (group I) after admission. Participants in group R will receive ultrasound-guided subgluteal sciatic catheterisation, followed by continuous PCRA infusion (0.2% ropivacaine 15 mL as loading dose, 8 mL/hour as background with a patient-controlled bolus of 6 mL). Participants in group I will receive PCIA (morphine is given in boluses of 1 mg as needed, background infusion at 1 mg/hour). Data will be collected at baseline (T0), 2 hours before revascularisation treatment (T1) and 2 hours before discharge (T2). The primary outcomes include the Numerical Rating Scale pain score at T1 and T2. The secondary outcomes include the perioperative transcutaneous oxygen pressure, the Tissue Haemoglobin Index, Hospital Anxiety and Depression Scale at T1 and T2; the Patient Global Impression of Change and patient satisfaction at T1 and T2; the perioperative cumulative morphine consumption, the length of postoperative hospital stay and adverse events. ETHICS AND DISSEMINATION This study received authorisation from the Institutional Review Board of Peking Union Medical College Hospital on 21 March 2017 (approval no. ZS-1289X). Study findings will be disseminated through presentations at scientific conferences or publications in peer-reviewed journals. TRIAL REGISTRATION NUMBER Chinese Clinical Trial Registry (ChiCTR2000029298). PROTOCOL VERSION V.4CP.B2 (15 June 2020).
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Affiliation(s)
- Si Chen
- Department of Anesthesiology, Peking Union Medical College Hospital, Beijing, China
| | - Zhonghuang Xu
- Department of Anesthesiology, Peking Union Medical College Hospital, Beijing, China
| | - Hongju Liu
- Department of Anesthesiology, Peking Union Medical College Hospital, Beijing, China
| | - Yuelun Zhang
- Medical Research Center, Peking Union Medical College Hospital, Beijing, China
| | - Jiao Zhang
- Department of Anesthesiology, Peking Union Medical College Hospital, Beijing, China
| | - Yuexin Chen
- Department of Vascular Surgery, Peking Union Medical College Hospital, Beijing, China
| | - Yuehong Zheng
- Department of Vascular Surgery, Peking Union Medical College Hospital, Beijing, China
| | - Yuguang Huang
- Department of Anesthesiology, Peking Union Medical College Hospital, Beijing, China
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24
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Regional anesthesia for vascular surgery: does the anesthetic choice influence outcome? Curr Opin Anaesthesiol 2020; 32:690-696. [PMID: 31415047 DOI: 10.1097/aco.0000000000000781] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
Abstract
PURPOSE OF REVIEW Outcomes following surgery are of major importance to clinicians, institutions and most importantly patients. This review examines whether regional anesthesia and analgesia influence outcome after vascular surgery. RECENT FINDINGS Large database analyses of contemporary practice suggest that utilizing regional anesthesia for both open and endovascular aortic aneurysm repair, lower limb revascularization and carotid endarterectomy reduces morbidity, length of stay and possibly even mortality. Results from such analyses are limited by an inherent risk of bias but are nevertheless important given the number of patients required in randomized trials to detect differences in rare outcomes. There is minimal evidence that regional anesthesia influences longer term outcomes except for arteriovenous fistula surgery where brachial plexus blocks appear to improve 3-month fistula patency. SUMMARY Patients undergoing vascular surgery often have multiple comorbidities and it is important to be able to outline both benefits and risks of regional anesthesia techniques. Regional anesthesia in vascular surgery allows avoidance of general anesthesia and does provide short-term benefits beyond superior analgesia. Evidence of long-term benefits is lacking in most procedures. Further work is required on newer patient centered outcomes.
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25
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Fereydooni A, O'Meara T, Popescu WM, Dardik A, Ochoa Chaar CI. Use of neuraxial anesthesia for hybrid lower extremity revascularization is associated with reduced perioperative morbidity. J Vasc Surg 2019; 71:1296-1304.e7. [PMID: 31708304 DOI: 10.1016/j.jvs.2019.07.072] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/16/2019] [Accepted: 07/15/2019] [Indexed: 11/19/2022]
Abstract
OBJECTIVE Recent advances in endovascular technology have allowed complex peripheral arterial disease (PAD) to be treated with less invasive hybrid procedures under neuraxial anesthesia. This study investigates the perioperative outcomes of hybrid lower extremity revascularization (LER) performed under neuraxial anesthesia (NAA) vs general anesthesia (GA). We hypothesize that the use of NAA is associated with improved outcomes. METHODS The 2005-2017 American College of Surgeons National Surgical Quality Improvement Program dataset was used to identify patients who underwent hybrid LER for PAD. Based on the primary anesthetic technique, patients were divided into two groups: GA and NAA, which included spinal or epidural anesthesia. Baseline characteristics of the two groups were compared. A group of patients treated under GA were matched (2:1) to patients in the NAA group based on gender, age, race, functional status, transfer status, chronic obstructive pulmonary disease, wound infection, American Society of Anesthesiologists classification, emergent surgery, preoperative sepsis, indication, and type of hybrid procedure. Patient characteristics and 30-day outcomes were compared. RESULTS Of 9430 patients who underwent hybrid LER, only 452 (4.8%) received NAA. Patients who received NAA were older (mean age, 68 ± 8.4 vs 72.3 ± 9.2; P = .004) and were more likely to be white (70.9% vs 85.6%; P < .0001), have dependent functional status (7.6% vs 13.1%; P < .0001), chronic obstructive pulmonary disease (24.3% vs 17.5%; P = .001), and a diagnosis of wound infection (15% vs 23.5%; P < .0001). After propensity matching, 904 patients in the GA group were compared with 452 patients in the NAA group with no difference in baseline characteristics. NAA was associated with reduced rate of more than 48 hours' ventilator requirement (2.4% vs 0.2%; P = .0014), bleeding requiring transfusion (17.5% vs 8%; P < .0001), and overall morbidity (29.3% vs 19%; P < .0001), as well as shorter length of hospital stay (6.8 ± 9.3 vs 5.3 ± 6.1 days; P = .0026) and total operating time (237.8 ± 109 vs 202.4 ± 113 minutes; P < .0001) compared with GA. CONCLUSIONS NAA is an infrequently used anesthesia technique during hybrid LER and is primarily used for older patients with chronic obstructive pulmonary disease. NAA is associated with decreased perioperative morbidity and length of hospital stay compared with GA and may be considered in this sicker patient population.
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Affiliation(s)
| | | | - Wanda M Popescu
- Department of Anesthesiology, Yale School of Medicine, New Haven, Conn
| | - Alan Dardik
- Division of Vascular and Endovascular Surgery, Department of Surgery, Yale School of Medicine, New Haven, Conn
| | - Cassius Iyad Ochoa Chaar
- Division of Vascular and Endovascular Surgery, Department of Surgery, Yale School of Medicine, New Haven, Conn.
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