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Abdu Y, Rahhal A, Ahmed K, Adli N, Abdou M, Ali EAH, Al-Kindi S, Al Rasheed M, Altooq J, Bougmiza I, Yassin MA. The role of preoperative transfusion in sickle cell disease, a systematic review and meta-analysis. Blood Rev 2024; 65:101183. [PMID: 38388223 DOI: 10.1016/j.blre.2024.101183] [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: 09/30/2023] [Revised: 02/15/2024] [Accepted: 02/16/2024] [Indexed: 02/24/2024]
Abstract
This systematic review and meta-analysis aimed to provide guidance on preoperative blood transfusion strategies for patients with sickle cell disease (SCD). We included all randomized controlled and observational studies exploring the clinical outcomes of preoperative blood transfusion among patients with SCD compared to the conservative transfusion strategy until 14/09/2022. Sixteen studies involving 3486 participants were analysed. The findings revealed a significantly higher bleeding rate in patients who received preoperative transfusion than those who followed a conservative strategy (RR = 4.32, 95% CI 1.75-10.68, P = 0.002, I2 = 0%). However, the two strategies had no significant differences in other clinical outcomes, such as acute chest syndrome, painful crisis, fever, neurological complications, thrombosis, ICU admission, and mortality. It is important to note that all the included studies had a moderate risk of bias. Preoperative transfusion in SCD was associated with a higher bleeding risk but a similar risk in other outcomes compared to conservative strategies. Notably, the increased bleeding risk observed seldom had clinical significance. We recommend individualizing management strategies, considering the overall positive impact of transfusions in reducing complications. Further high-quality studies are needed to refine recommendations.
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Affiliation(s)
- Yasamin Abdu
- Department of Community Medicine, Hamad Medical Corporation, Doha, Qatar.
| | - Alaa Rahhal
- Department of Pharmacy, Hamad Medical Corporation, Doha, Qatar
| | - Khalid Ahmed
- Department of Haematology, Royal Hallamshire Hospital, Sheffield Teaching Hospitals NHS Foundation trust, Sheffield, UK
| | - Nada Adli
- Department of Community Medicine, Hamad Medical Corporation, Doha, Qatar
| | - Mariam Abdou
- Department of Community Medicine, Hamad Medical Corporation, Doha, Qatar
| | | | - Salam Al-Kindi
- Department of Haematology, Sultan Qaboos University, Muscat, Oman.
| | | | - Jaffer Altooq
- Department of Internal Medicine, Bahrain Salmania Hospital, Manama, Bahrain
| | - Iheb Bougmiza
- Department of Community Medicine, Primary Health Care Corporation, Doha, Qatar; Faculty of Medicine, Sousse University, Sousse, Tunisia.
| | - Mohamed A Yassin
- Department of Haematology, NCCCR, Hamad Medical Corporation, Doha, Qatar; College of Medicine, Qatar University, Doha, Qatar
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Snyder CW, Bludevich BM, Gonzalez R, Danielson PD, Chandler NM. Risk factors for complications after abdominal surgery in children with sickle cell disease. J Pediatr Surg 2021; 56:711-716. [PMID: 33010885 DOI: 10.1016/j.jpedsurg.2020.08.034] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/20/2020] [Revised: 08/24/2020] [Accepted: 08/30/2020] [Indexed: 12/26/2022]
Abstract
BACKGROUND Abdominal surgery in children with sickle cell disease (SCD) carries an increased risk of postoperative complications. Preoperative transfusions are frequently given to decrease the risk of vasoocclusive events. However, risk factors for postoperative complications are not well-defined in the pediatric population. METHODS Pediatric patients with SCD undergoing common abdominal operations were identified from the National Surgical Quality Improvement Program-Pediatric (NSQIP-P) database from 2012 to 2018. Outcomes of interest were the incidence rates of 1) any complication or readmission, and 2) serious SCD-related complications (stroke, new onset seizure, ventilator support >24 h postoperatively, or readmission with SCD crisis within 30 days of surgery). Patients were categorized by transfusion approach (transfusion within 48 h before surgery vs. no transfusion) and preoperative hematocrit (<21.0, 21.0-23.9, 24.0-26.9, 27.0-29.9, ≥30.0). Stratified bivariate analyses and multivariable logistic regression were used to identify independent risk factors for complications. RESULTS A total of 813 patients met inclusion criteria. There were 470 cholecystectomy, 251 splenectomy, 39 appendectomy, and 53 combination procedures; 13% of cases were urgent or emergent. Preoperative hematocrit levels were <21.0 in 3%, 21.0-23.9 in 10%, 24.0-26.9 in 17%, 27.0-29.9in 30%, and ≥30.0 in 41% of patients; 52% received perioperative transfusion. The 30-day incidences of any complication/readmission and SCD-related complications were 12% and 4%, respectively. On bivariate analyses, urgent/emergent case status was the only significant predictor of complications, carrying risk of 20% and 8% for overall and SCD-related complications, respectively; this finding persisted on multivariable logistic regression (OR 1.83, 95% CI 1.0.2-3.29, p = 0.04). Neither preoperative transfusion nor preoperative hematocrit level was associated with complication risk, although there was a trend toward higher SCD-related complications in patients with preoperative hematocrit <21.0 (p = 0.07). CONCLUSION In this large cohort of pediatric SCD patients undergoing abdominal surgery, there was no clear association between postoperative complications and the transfusion approach or the preoperative hematocrit level within the range above 21.0. Urgent/emergent surgical procedures carried a nearly two-fold higher complication risk compared to elective procedures. Future studies should prospectively evaluate preoperative transfusion approaches and compare immediate and delayed operative management to nonoperative management in this population. LEVEL OF EVIDENCE III Retrospective review.
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Affiliation(s)
- Christopher W Snyder
- Division of Pediatric Surgery, Johns Hopkins All Children's Hospital, St. Petersburg, Florida.
| | - Bryce M Bludevich
- Division of Pediatric Surgery, Johns Hopkins All Children's Hospital, St. Petersburg, Florida
| | - Raquel Gonzalez
- Division of Pediatric Surgery, Johns Hopkins All Children's Hospital, St. Petersburg, Florida
| | - Paul D Danielson
- Division of Pediatric Surgery, Johns Hopkins All Children's Hospital, St. Petersburg, Florida
| | - Nicole M Chandler
- Division of Pediatric Surgery, Johns Hopkins All Children's Hospital, St. Petersburg, Florida
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Estcourt LJ, Kimber C, Trivella M, Doree C, Hopewell S. Preoperative blood transfusions for sickle cell disease. Cochrane Database Syst Rev 2020; 7:CD003149. [PMID: 32614473 PMCID: PMC7389247 DOI: 10.1002/14651858.cd003149.pub4] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
BACKGROUND Sickle cell disease (SCD) is one of the commonest severe monogenic disorders in the world, due to the inheritance of two abnormal haemoglobin (beta globin) genes. SCD can cause severe pain, significant end-organ damage, pulmonary complications, and premature death. Surgical interventions are more common in people with SCD, and occur at much younger ages than in the general population. Blood transfusions are frequently used prior to surgery and several regimens are used but there is no consensus over the best method or the necessity of transfusion in specific surgical cases. This is an update of a Cochrane Review. OBJECTIVES To determine whether there is evidence that preoperative blood transfusion in people with SCD undergoing elective or emergency surgery reduces mortality and perioperative or sickle cell-related serious adverse events. To compare the effectiveness of different transfusion regimens (aggressive or conservative) if preoperative transfusions are indicated in people with SCD. SEARCH METHODS We searched for relevant trials in the Cochrane Library, MEDLINE (from 1946), Embase (from 1974), the Transfusion Evidence Library (from 1980), and ongoing trial databases; all searches current to 28 January 2020 We searched the Cochrane Cystic Fibrosis and Genetic Disorders Group Trials Register: 19 September 2019. SELECTION CRITERIA All randomised controlled trials and quasi-randomised controlled trials comparing preoperative blood transfusion regimens to different regimens or no transfusion in people with SCD undergoing elective or emergency surgery. There was no restriction by outcomes examined, language or publication status. DATA COLLECTION AND ANALYSIS Two authors independently assessed trial eligibility and the risk of bias and extracted data. MAIN RESULTS Three trials with 990 participants were eligible for inclusion in the review. There were no ongoing trials identified. These trials were conducted between 1988 and 2011. The majority of people included had haemoglobin (Hb) SS SCD. The majority of surgical procedures were considered low or intermediate risk for developing sickle cell-related complications. Aggressive versus simple red blood cell transfusions One trial (551 participants) compared an aggressive transfusion regimen (decreasing sickle haemoglobin to less than 30%) to a simple transfusion regimen (increasing haemoglobin to 100 g/L). This trial re-randomised participants and therefore quantitative analysis was only possible on two subsets of data: participants undergoing cholecystectomy (230 participants); and participants undergoing tonsillectomy or adenoidectomy surgeries (107 participants). Data were not combined as we do not know if any participant received both surgeries. Overall, the quality of the evidence was very low across different outcomes according to GRADE methodology. This was due to the trial being at high risk of bias primarily due to lack of blinding, indirectness and the outcome estimates being imprecise. Cholecystectomy subgroup results are reported in the abstract. Results for both subgroups were similar. There was no difference in all-cause mortality between people receiving aggressive transfusions and those receiving conservative transfusions. No deaths occurred in either subgroup. There were no differences between the aggressive transfusion group and conservative transfusion group in the number of people developing: • an acute chest syndrome, risk ratio (RR) 0.84 (95% confidence interval (CI) 0.38 to 1.84) (one trial, 230 participants, very low-quality evidence); • vaso-occlusive crisis, risk ratio 0.30 (95% CI 0.09 to 1.04) (one trial, 230 participants, very low quality evidence); • serious infection, risk ratio 1.75 (95% CI 0.59 to 5.18) (one trial, 230 participants, very low-quality evidence); • any perioperative complications, RR 0.75 (95% CI 0.36 to 1.55) (one trial, 230 participants, very low-quality evidence); • a transfusion-related complication, RR 1.85 (95% CI 0.89 to 3.88) (one trial, 230 participants, very low-quality evidence). Preoperative transfusion versus no preoperative transfusion Two trials (434 participants) compared a preoperative transfusion plus standard care to a group receiving standard care. Overall, the quality of the evidence was low to very low across different outcomes according to GRADE methodology. This was due to the trials being at high risk of bias due to lack of blinding, and outcome estimates being imprecise. One trial was stopped early because more people in the no transfusion arm developed an acute chest syndrome. There was no difference in all-cause mortality between people receiving preoperative transfusions and those receiving no preoperative transfusions (two trials, 434 participants, no deaths occurred). There was significant heterogeneity between the two trials in the number of people developing an acute chest syndrome, a meta-analysis was therefore not performed. One trial showed a reduced number of people developing acute chest syndrome between people receiving preoperative transfusions and those receiving no preoperative transfusions, risk ratio 0.11 (95% confidence interval 0.01 to 0.80) (65 participants), whereas the other trial did not, RR 4.81 (95% CI 0.23 to 99.61) (369 participants). There were no differences between the preoperative transfusion groups and the groups without preoperative transfusion in the number of people developing: • a vaso-occlusive crisis, Peto odds ratio (OR) 1.91 (95% confidence interval 0.61 to 6.04) (two trials, 434 participants, very low-quality evidence). • a serious infection, Peto OR 1.29 (95% CI 0.29 to 5.71) (two trials, 434 participants, very low-quality evidence); • any perioperative complications, RR 0.24 (95% CI 0.03 to 2.05) (one trial, 65 participants, low-quality evidence). There was an increase in the number of people developing circulatory overload in those receiving preoperative transfusions compared to those not receiving preoperative transfusions in one of the two trials, and no events were seen in the other trial (no meta-analysis performed). AUTHORS' CONCLUSIONS There is insufficient evidence from randomised trials to determine whether conservative preoperative blood transfusion is as effective as aggressive preoperative blood transfusion in preventing sickle-related or surgery-related complications in people with HbSS disease. There is very low quality evidence that preoperative blood transfusion may prevent development of acute chest syndrome. Due to lack of evidence this review cannot comment on management for people with HbSC or HbSβ+ disease or for those with high baseline haemoglobin concentrations.
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Affiliation(s)
- Lise J Estcourt
- Haematology/Transfusion Medicine, NHS Blood and Transplant, Oxford, UK
| | - Catherine Kimber
- Systematic Review Initiative, NHS Blood and Transplant, Oxford, UK
| | | | - Carolyn Doree
- Systematic Review Initiative, NHS Blood and Transplant, Oxford, UK
| | - Sally Hopewell
- Nuffield Department of Orthopaedics, Rheumatology and Musculoskeletal Sciences (NDORMS), University of Oxford, Oxford, UK
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Chou ST, Alsawas M, Fasano RM, Field JJ, Hendrickson JE, Howard J, Kameka M, Kwiatkowski JL, Pirenne F, Shi PA, Stowell SR, Thein SL, Westhoff CM, Wong TE, Akl EA. American Society of Hematology 2020 guidelines for sickle cell disease: transfusion support. Blood Adv 2020; 4:327-355. [PMID: 31985807 PMCID: PMC6988392 DOI: 10.1182/bloodadvances.2019001143] [Citation(s) in RCA: 273] [Impact Index Per Article: 54.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/28/2019] [Accepted: 11/20/2019] [Indexed: 12/26/2022] Open
Abstract
BACKGROUND Red cell transfusions remain a mainstay of therapy for patients with sickle cell disease (SCD), but pose significant clinical challenges. Guidance for specific indications and administration of transfusion, as well as screening, prevention, and management of alloimmunization, delayed hemolytic transfusion reactions (DHTRs), and iron overload may improve outcomes. OBJECTIVE Our objective was to develop evidence-based guidelines to support patients, clinicians, and other healthcare professionals in their decisions about transfusion support for SCD and the management of transfusion-related complications. METHODS The American Society of Hematology formed a multidisciplinary panel that was balanced to minimize bias from conflicts of interest and that included a patient representative. The panel prioritized clinical questions and outcomes. The Mayo Clinic Evidence-Based Practice Research Program supported the guideline development process. The Grading of Recommendations Assessment, Development and Evaluation (GRADE) approach was used to form recommendations, which were subject to public comment. RESULTS The panel developed 10 recommendations focused on red cell antigen typing and matching, indications, and mode of administration (simple vs red cell exchange), as well as screening, prevention, and management of alloimmunization, DHTRs, and iron overload. CONCLUSIONS The majority of panel recommendations were conditional due to the paucity of direct, high-certainty evidence for outcomes of interest. Research priorities were identified, including prospective studies to understand the role of serologic vs genotypic red cell matching, the mechanism of HTRs resulting from specific alloantigens to inform therapy, the role and timing of regular transfusions during pregnancy for women, and the optimal treatment of transfusional iron overload in SCD.
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Affiliation(s)
- Stella T Chou
- Division of Hematology, Children's Hospital of Philadelphia, Perelman School of Medicine at the University of Pennsylvania, Philadelphia, PA
| | - Mouaz Alsawas
- Mayo Clinic Evidence-Based Practice Research Program, Mayo Clinic, Rochester, MN
| | - Ross M Fasano
- Center for Transfusion and Cellular Therapy, Department of Pathology and Laboratory Medicine, Emory University School of Medicine, Atlanta, GA
| | - Joshua J Field
- Department of Medicine, Medical College of Wisconsin, Milwaukee, WI
| | - Jeanne E Hendrickson
- Department of Laboratory Medicine and
- Department of Pediatrics, Yale University School of Medicine, New Haven, CT
| | - Jo Howard
- Department of Haematological Medicine, King's College London, London, United Kingdom
- Department of Haematology, Guy's and St Thomas' NHS Foundation Trust, London, United Kingdom
| | - Michelle Kameka
- Nicole Wertheim College of Nursing and Health Sciences, Florida International University, Miami, FL
| | - Janet L Kwiatkowski
- Division of Hematology, Children's Hospital of Philadelphia, Perelman School of Medicine at the University of Pennsylvania, Philadelphia, PA
| | - France Pirenne
- INSERM-U955, Laboratory of Excellence, French Blood Establishment, Créteil, France
| | | | - Sean R Stowell
- Center for Transfusion and Cellular Therapy, Department of Pathology and Laboratory Medicine, Emory University School of Medicine, Atlanta, GA
| | - Swee Lay Thein
- Sickle Cell Branch, National Heart, Lung, and Blood Institute, National Institutes of Health, Bethesda, MD
| | - Connie M Westhoff
- Laboratory of Immunohematology and Genomics, New York Blood Center, New York, NY
| | - Trisha E Wong
- Division of Hematology/Oncology, Department of Pediatrics, Oregon Health and Science University, Portland, OR; and
| | - Elie A Akl
- Department of Internal Medicine, American University of Beirut, Beirut, Lebanon
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5
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Schyrr F, Dolci M, Nydegger M, Canellini G, Andreu-Ullrich H, Joseph JM, Diezi M, Cachat F, Rizzi M, Renella R. Perioperative care of children with sickle cell disease: A systematic review and clinical recommendations. Am J Hematol 2020; 95:78-96. [PMID: 31456233 DOI: 10.1002/ajh.25626] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/15/2019] [Revised: 08/20/2019] [Accepted: 08/22/2019] [Indexed: 02/06/2023]
Abstract
Children with sickle cell disease (SCD) require specific perioperative care, and clinical practice in this area remains poorly defined. We aimed to conduct a systematic, PRISMA-based review of the literature, available clinical guidelines and practice recommendations. We also aimed to extract any valuable information for the "best of available-evidence"-based prevention of perioperative adverse events in children with SCD, and highlight the most urgent priorities in clinical research. As data sources, US National Library of Medicine, Medline, National Guideline Clearinghouse, International Guideline Network, TRIP databases were searched for any content until January 2019. We also included institutional, consortia and expert group guidelines. Included were reports/guidelines in English, French, German, and Italian. Excluded were reports on obstetrical and fetal management. We identified 202 reports/guidelines fulfilling the criteria outlined above. A majority focused on visceral, cardiovascular and orthopedic surgery procedures, and only five were multicenter randomized controlled trials and two prospective randomized studies. After grading of the quality of the evidence, the extracted data was summarized into clinical recommendations for daily practice. Additionally, we designed a risk-grading algorithm to identify contexts likely to be associated with adverse outcomes. In conclusion, we provide a systematic PRISMA-based review of the existing literature and ancillary practice and delineate a set of clinical recommendations and priorities for research.
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Affiliation(s)
- Frederica Schyrr
- Pediatric Hematology-Oncology Unit, Division of Pediatrics, Department "Woman-Mother-Child", Lausanne University Hospital and Lausanne University, Lausanne, Switzerland
| | - Mirko Dolci
- Division of Anesthesia, Department of Surgery, Lausanne University Hospital and Lausanne University, Lausanne, Switzerland
| | - Martine Nydegger
- Division of Anesthesia, Department of Surgery, Lausanne University Hospital and Lausanne University, Lausanne, Switzerland
| | - Giorgia Canellini
- Transfusion Medicine Unit, Department of Laboratory Medicine, Lausanne University Hospital and Lausanne University, Lausanne, Switzerland
| | - Heidrun Andreu-Ullrich
- Transfusion Medicine Unit, Department of Laboratory Medicine, Lausanne University Hospital and Lausanne University, Lausanne, Switzerland
| | - Jean-Marc Joseph
- Division of Pediatric Surgery, Department "Woman-Mother-Child", Lausanne University Hospital and Lausanne University, Lausanne, Switzerland
| | - Manuel Diezi
- Pediatric Hematology-Oncology Unit, Division of Pediatrics, Department "Woman-Mother-Child", Lausanne University Hospital and Lausanne University, Lausanne, Switzerland
| | - Francois Cachat
- Pediatric Nephrology Unit, Division of Pediatrics, Department "Woman-Mother-Child", Lausanne University Hospital and Lausanne University, Lausanne, Switzerland
| | - Mattia Rizzi
- Pediatric Hematology-Oncology Unit, Division of Pediatrics, Department "Woman-Mother-Child", Lausanne University Hospital and Lausanne University, Lausanne, Switzerland
| | - Raffaele Renella
- Pediatric Hematology-Oncology Unit, Division of Pediatrics, Department "Woman-Mother-Child", Lausanne University Hospital and Lausanne University, Lausanne, Switzerland
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Adisa AO, Adedeji TA, Bolarinwa RA, Owojuyigbe TO, Jeje OA, Glasbey J, Akinola NO. The Inflammatory Response to Surgery in Sickle Cell Disease Patients Undergoing Cholecystectomy. JSLS 2019; 23:JSLS.2019.00027. [PMID: 31285651 PMCID: PMC6596445 DOI: 10.4293/jsls.2019.00027] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022] Open
Abstract
Background and Objectives: Patients with sickle cell anemia (SCA) may have elevated inflammatory markers in health, and this may be heightened after open operations. The inflammatory response of patients with SCA after minimally invasive surgeries has not been fully explored. Patients and Methods: Consecutive patients with SCA and with hemoglobin AA (HbAA) undergoing laparoscopic cholecystectomy for acute cholecystitis were recruited into the study. Blood samples were taken before induction of anesthesia (0-h); at 4, 12, 24, and 48 h; and on postoperative day 7. Samples were analyzed for serum C-reactive protein and interleukin (IL)-1 through IL-18. Results: Twenty-three patients, including 9 with SCA and 14 with HbAA, were recruited with 4 cases performed by open laparotomy. At 0-h, proinflammatory IL-1 levels (6.1 versus 4.8) and C-reactive protein levels (32.5 versus 26.6) were higher in patients with hemoglobin SS (HbSS) than in patients with HbAA, respectively. Over time, inflammatory markers were generally higher at each time-point for patients with HbSS compared with patients with HbAA for both proinflammatory and anti-inflammatory cytokines, rising immediately after surgery and up to 48 hours, then returning to baseline by postoperative day 7. There was a higher mean IL-1 level across all time-points in the HbSS group than in the HbAA group (P = .04). Conclusion: This exploratory study found an enhanced inflammatory response to cholecystectomy in patients with SCA compared with patients with HbAA. Minimally invasive surgical strategies for this patient group may help to mediate this response.
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Affiliation(s)
- Adewale O Adisa
- Department of Surgery, Obafemi Awolowo University and Obafemi Awolowo University Teaching Hospitals Complex, Ile-Ife, Osun State, Nigeria
| | - Tewogbade A Adedeji
- Department of Chemical Pathology, Obafemi Awolowo University and Obafemi Awolowo University Teaching Hospitals Complex, Ile-Ife, Osun State, Nigeria
| | - Rahman A Bolarinwa
- Department of Haematology, Obafemi Awolowo University and Obafemi Awolowo University Teaching Hospitals Complex, Ile-Ife, Osun State, Nigeria
| | - Temilola O Owojuyigbe
- Department of Haematology, Obafemi Awolowo University and Obafemi Awolowo University Teaching Hospitals Complex, Ile-Ife, Osun State, Nigeria
| | - Olusola A Jeje
- Department of Chemical Pathology, Obafemi Awolowo University and Obafemi Awolowo University Teaching Hospitals Complex, Ile-Ife, Osun State, Nigeria
| | - James Glasbey
- Academic Department of Surgery, University of Birmingham, Birmingham, United Kingdom
| | - Norah O Akinola
- Department of Haematology, Obafemi Awolowo University and Obafemi Awolowo University Teaching Hospitals Complex, Ile-Ife, Osun State, Nigeria
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Perioperative Management of Sickle Cell Disease. Mediterr J Hematol Infect Dis 2018; 10:e2018032. [PMID: 29755709 PMCID: PMC5937979 DOI: 10.4084/mjhid.2018.032] [Citation(s) in RCA: 28] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/04/2017] [Accepted: 04/19/2018] [Indexed: 11/22/2022] Open
Abstract
Over 30 million people worldwide have sickle cell disease (SCD). Emergent and non-emergent surgical procedures in SCD have been associated with relatively increased risks of peri-operative mortality, vaso-occlusive (painful) crisis, acute chest syndrome, post-operative infections, congestive heart failure, cerebrovascular accident and acute kidney injury. Pre-operative assessment must include a careful review of the patient’s known crisis triggers, baseline hematologic profile, usual transfusion requirements, pre-existing organ dysfunction and opioid use. Use of preoperative blood transfusions should be selective and decisions individualized based on the baseline hemoglobin, surgical procedure and anticipated volume of blood loss. Intra- and post-operative management should focus on minimizing hypoxia, hypothermia, acidosis, and intravascular volume depletion. Pre- and post-operative incentive spirometry use should be encouraged.
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de'Angelis N, Abdalla S, Carra MC, Lizzi V, Martínez-Pérez A, Habibi A, Bartolucci P, Galactéros F, Laurent A, Brunetti F. Low-impact laparoscopic cholecystectomy is associated with decreased postoperative morbidity in patients with sickle cell disease. Surg Endosc 2018; 32:2300-2311. [PMID: 29098436 DOI: 10.1007/s00464-017-5925-y] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/18/2017] [Accepted: 10/08/2017] [Indexed: 01/05/2023]
Abstract
BACKGROUND Laparoscopic cholecystectomy (LC) is one of the most frequent surgeries performed in patients with sickle cell disease (SCD). LC in SCD patients is associated with a particularly high postoperative morbidity. The aim of the present study is to assess the safety and feasibility of cholecystectomy performed by mini-laparoscopy with low- and stable-pressure pneumoperitoneum (MLC + LSPP) and to compare the rate of postoperative SCD-related morbidity with standard LC. METHODS Thirty-five consecutive SCD patients admitted between November 2015 and March 2017 for cholelithiasis requiring surgery were compared with an historical cohort of 126 SCD patients who underwent LC for the same indication. Operative variables, postoperative outcomes, patient and surgeon satisfaction, and costs were evaluated. RESULTS MLC + LSPP exhibited a mean operative time comparable to LC (p = 0.169). Operative blood loss was significantly reduced in the MLC + LSPP group, and the suction device was rarely used (p = 0.036). SCD-related morbidity (including acute chest syndrome) was significantly higher in the LC group compared with the MLC + LSPP group (18.3 vs. 2.9%; p = 0.029). The mean times to resume ambulation (p = 0.018) and regular diet (p = 0.045) were significantly reduced in the MLC + LSPP group. The mean incision length (all trocars combined) was 28.22 mm for MLC + LSPP and 49.64 mm for LC patients (p < 0.0001). Multivariate regression analysis demonstrated that the only significant predictor of postoperative SCD-related morbidity was the surgical approach (odds ratio: 9.24). Patient and surgeon satisfaction were very high for MLC + LSPP. The mean total cost per patient (surgery and hospitalization) was not different between groups (p = 0.084). CONCLUSION MLC + LSPP in SCD patients appears to be safe and feasible. Compared with LC, MLC + LSPP in SCD patients is associated with a significantly reduced incidence of postoperative SCD-related morbidity and more rapid ambulation and return to regular diet without increasing the total costs per patient.
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Affiliation(s)
- Nicola de'Angelis
- Unit of Digestive, Hepato-Pancreato-Biliary Surgery and Liver Transplantation, Henri-Mondor Hospital, AP-HP, Université Paris Est - UPEC, 51 Avenue du Maréchal de Lattre de Tassigny, 94010, Créteil, France.
| | - Solafah Abdalla
- Unit of Digestive, Hepato-Pancreato-Biliary Surgery and Liver Transplantation, Henri-Mondor Hospital, AP-HP, Université Paris Est - UPEC, 51 Avenue du Maréchal de Lattre de Tassigny, 94010, Créteil, France
| | | | - Vincenzo Lizzi
- Unit of Digestive, Hepato-Pancreato-Biliary Surgery and Liver Transplantation, Henri-Mondor Hospital, AP-HP, Université Paris Est - UPEC, 51 Avenue du Maréchal de Lattre de Tassigny, 94010, Créteil, France
| | - Aleix Martínez-Pérez
- Unit of Digestive, Hepato-Pancreato-Biliary Surgery and Liver Transplantation, Henri-Mondor Hospital, AP-HP, Université Paris Est - UPEC, 51 Avenue du Maréchal de Lattre de Tassigny, 94010, Créteil, France
| | - Anoosha Habibi
- Department of Internal Medicine, Sickle Cell Referral Center, AP-HP, Henri Mondor University Hospital, Créteil, France
- UPEC, Institut Mondor de Recherche Biomédicale (IMRB), Institut National de la Santé et de le Recherche Médicale (INSERM) U955, Créteil, France
| | - Pablo Bartolucci
- Department of Internal Medicine, Sickle Cell Referral Center, AP-HP, Henri Mondor University Hospital, Créteil, France
- UPEC, Institut Mondor de Recherche Biomédicale (IMRB), Institut National de la Santé et de le Recherche Médicale (INSERM) U955, Créteil, France
| | - Frédéric Galactéros
- Department of Internal Medicine, Sickle Cell Referral Center, AP-HP, Henri Mondor University Hospital, Créteil, France
- UPEC, Institut Mondor de Recherche Biomédicale (IMRB), Institut National de la Santé et de le Recherche Médicale (INSERM) U955, Créteil, France
| | - Alexis Laurent
- Unit of Digestive, Hepato-Pancreato-Biliary Surgery and Liver Transplantation, Henri-Mondor Hospital, AP-HP, Université Paris Est - UPEC, 51 Avenue du Maréchal de Lattre de Tassigny, 94010, Créteil, France
- UPEC, Institut Mondor de Recherche Biomédicale (IMRB), Institut National de la Santé et de le Recherche Médicale (INSERM) U955, Créteil, France
| | - Francesco Brunetti
- Unit of Digestive, Hepato-Pancreato-Biliary Surgery and Liver Transplantation, Henri-Mondor Hospital, AP-HP, Université Paris Est - UPEC, 51 Avenue du Maréchal de Lattre de Tassigny, 94010, Créteil, France
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Al Talhi Y, Shirah BH, Altowairqi M, Yousef Y. Laparoscopic cholecystectomy for cholelithiasis in children with sickle cell disease. Clin J Gastroenterol 2017; 10:320-326. [PMID: 28555355 DOI: 10.1007/s12328-017-0750-3] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/24/2017] [Accepted: 05/14/2017] [Indexed: 12/13/2022]
Abstract
Patients with sickle cell disease (SCD) suffer from an increased incidence of gallstone formation due to hemolysis of sickled red blood cells; this leads to an increased level of bilirubin in secreted bile that becomes a nidus for pigment stone formation. Laparoscopic cholecystectomy (LC) is considered a standard operative procedure for gallstone disease mainly due to lower postoperative wound complaints, faster recovery, better postoperative cosmetic results, shorter hospital stay, and earlier return to work. Although numerous studies have been published addressing both the advantages and complications of LC in acute calcular cholecystitis, there is still limited evidence concerning the safety and efficacy of LC for the management of cholelithiasis in pediatric patients with SCD, and controversies remain unresolved. In this review, we aim to comprehensively study the available literature and propose evidence-based practice recommendations for the optimal management of gallstones in pediatric SCD patients. The current practice differs greatly depending on the prevalence of SCD in a particular geographic area. We acknowledge the limited number of patients reported, the lack of randomized control trials addressing the practice of specific recommendations, and the need for further evidence-based studies.
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Affiliation(s)
- Yousef Al Talhi
- King Abdullah International Medical Research Centre, King Saud bin Abdulaziz University for Health Sciences, P.O. Box: 65362, Jeddah, 21556, Saudi Arabia
| | - Bader Hamza Shirah
- King Abdullah International Medical Research Centre, King Saud bin Abdulaziz University for Health Sciences, P.O. Box: 65362, Jeddah, 21556, Saudi Arabia.
| | | | - Yasmin Yousef
- King Abdullah International Medical Research Centre, King Saud bin Abdulaziz University for Health Sciences, P.O. Box: 65362, Jeddah, 21556, Saudi Arabia.,King Abdulaziz Medical City, Jeddah, Saudi Arabia
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Leake PA, Reid M, Plummer J. A case series of cholecystectomy in Jamaican sickle cell disease patients - The need for a new strategy. Ann Med Surg (Lond) 2017; 15:37-42. [PMID: 28228943 PMCID: PMC5312456 DOI: 10.1016/j.amsu.2017.02.001] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/20/2016] [Revised: 01/31/2017] [Accepted: 02/01/2017] [Indexed: 01/05/2023] Open
Abstract
High morbidity rates related to cholecystectomy in sickle cell disease (SCD) patients have been previously reported in the region. This study serves to assess the current outcomes related to cholecystectomy in a Jamaican SCD population. METHODS: A retrospective chart review of SCD patients undergoing elective cholecystectomy at the University Hospital of the West Indies over a 6-year period was performed providing relevant information for analysis. Patients were grouped on an intention-to-treat basis into an open and laparoscopic group. RESULTS: A total of 27 patients were included (18 laparoscopic and 9 open). Both groups were matched for age, gender and steady state hemoglobin. Only one patient (in the open group) received preoperative blood transfusion. The conversion rate for laparoscopy was 28%. Operative time was significantly longer in the open group (175.3 ± 62.1 vs. 125.9 ± 54.4 min, p = 0.0355). Bile duct exploration was undertaken in 66.7% of patients in the open group compared to 0% in the laparoscopic group. There was no significant difference between groups with respect to hospital stay, morbidity or mortality. The overall 30-day morbidity was 48.1% with acute chest syndrome being diagnosed in 6 patients and pneumonia in 7 patients. CONCLUSION: Morbidity rates related to cholecystectomy in the Jamaican SCD population remain high. Further studies to evaluate the factors contributing to such high morbidity in this population are warranted, with particular focus on laparoscopic cholecystectomy. Strategies such as preoperative transfusion and prophylactic cholecystectomy also need to be evaluated and considered in this patient group. Morbidity rates for cholecystectomy in Jamaican sickle cell patients remain high. There is a trend to higher morbidity for laparoscopic over open cholecystectomy. Preoperative transfusion is rarely employed in this patient population.
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Affiliation(s)
- Pierre-Anthony Leake
- Department of Surgery, Radiology, Anaesthetics & Intensive Care, University of the West Indies, Mona Campus, Jamaica
| | - Marvin Reid
- Tropical Metabolic Research Institute, University of the West Indies, Mona Campus, Jamaica
| | - Joseph Plummer
- Department of Surgery, Radiology, Anaesthetics & Intensive Care, University of the West Indies, Mona Campus, Jamaica
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Estcourt LJ, Fortin PM, Trivella M, Hopewell S, Cochrane Cystic Fibrosis and Genetic Disorders Group. Preoperative blood transfusions for sickle cell disease. Cochrane Database Syst Rev 2016; 4:CD003149. [PMID: 27049331 PMCID: PMC4854326 DOI: 10.1002/14651858.cd003149.pub3] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
BACKGROUND Sickle cell disease is one of the commonest severe monogenic disorders in the world, due to the inheritance of two abnormal haemoglobin (beta globin) genes. Sickle cell disease can cause severe pain, significant end-organ damage, pulmonary complications, and premature death. Surgical interventions are more common in people with sickle cell disease, and occur at much younger ages than in the general population. Blood transfusions are frequently used prior to surgery and several regimens are used but there is no consensus over the best method or the necessity of transfusion in specific surgical cases. This is an update of a Cochrane review first published in 2001. OBJECTIVES To determine whether there is evidence that preoperative blood transfusion in people with sickle cell disease undergoing elective or emergency surgery reduces mortality and perioperative or sickle cell-related serious adverse events.To compare the effectiveness of different transfusion regimens (aggressive or conservative) if preoperative transfusions are indicated in people with sickle cell disease. SEARCH METHODS We searched for relevant trials in The Cochrane Library, MEDLINE (from 1946), Embase (from 1974), the Transfusion Evidence Library (from 1980), and ongoing trial databases; all searches current to 23 March 2016.We searched the Cochrane Cystic Fibrosis and Genetic Disorders Group Trials Register: 18 January 2016. SELECTION CRITERIA All randomised controlled trials and quasi-randomised controlled trials comparing preoperative blood transfusion regimens to different regimens or no transfusion in people with sickle cell disease undergoing elective or emergency surgery. There was no restriction by outcomes examined, language or publication status. DATA COLLECTION AND ANALYSIS Two authors independently assessed trial eligibility and the risk of bias and extracted data. MAIN RESULTS Three trials with 990 participants were eligible for inclusion in the review. There were no ongoing trials identified. These trials were conducted between 1988 and 2011. The majority of people included had haemoglobin (Hb) SS SCD. The majority of surgical procedures were considered low or intermediate risk for developing sickle cell-related complications. Aggressive versus simple red blood cell transfusions One trial (551 participants) compared an aggressive transfusion regimen (decreasing sickle haemoglobin to less than 30%) to a simple transfusion regimen (increasing haemoglobin to 100 g/l). This trial re-randomised participants and therefore quantitative analysis was only possible on two subsets of data: participants undergoing cholecystectomy (230 participants); and participants undergoing tonsillectomy or adenoidectomy surgeries (107 participants). Data were not combined as we do not know if any participant received both surgeries. Overall, the quality of the evidence was very low across different outcomes according to GRADE methodology. This was due to the trial being at high risk of bias primarily due to lack of blinding, indirectness and the outcome estimates being imprecise. Cholecystectomy subgroup results are reported in the abstract. Results for both subgroups were similar.There was no difference in all-cause mortality between people receiving aggressive transfusions and those receiving conservative transfusions. No deaths occurred in either subgroup.There were no differences between the aggressive transfusion group and conservative transfusion group in the number of people developing:• an acute chest syndrome, risk ratio 0.84 (95% confidence interval 0.38 to 1.84) (one trial, 230 participants, very low quality evidence);• vaso-occlusive crisis, risk ratio 0.30 (95% confidence interval 0.09 to 1.04) (one trial, 230 participants, very low quality evidence);• serious infection, risk ratio 1.75 (95% confidence interval 0.59 to 5.18) (one trial, 230 participants, very low quality evidence);• any perioperative complications, risk ratio 0.75 (95% confidence interval 0.36 to 1.55) (one trial, 230 participants, very low quality evidence);• a transfusion-related complication, risk ratio 1.85 (95% confidence interval 0.89 to 3.88) (one trial, 230 participants, very low quality evidence). Preoperative transfusion versus no preoperative transfusion Two trials (434 participants) compared a preoperative transfusion plus standard care to a group receiving standard care. Overall, the quality of the evidence was low to very low across different outcomes according to GRADE methodology. This was due to the trials being at high risk of bias due to lack of blinding, and outcome estimates being imprecise. One trial was stopped early because more people in the no transfusion arm developed an acute chest syndrome.There was no difference in all-cause mortality between people receiving preoperative transfusions and those receiving no preoperative transfusions (two trials, 434 participants, no deaths occurred).There was significant heterogeneity between the two trials in the number of people developing an acute chest syndrome, a meta-analysis was therefore not performed. One trial showed a reduced number of people developing acute chest syndrome between people receiving preoperative transfusions and those receiving no preoperative transfusions, risk ratio 0.11 (95% confidence interval 0.01 to 0.80) (65 participants), whereas the other trial did not, risk ratio 4.81 (95% confidence interval 0.23 to 99.61) (369 participants).There were no differences between the preoperative transfusion groups and the groups without preoperative transfusion in the number of people developing:• a vaso-occlusive crisis, Peto odds ratio 1.91 (95% confidence interval 0.61 to 6.04) (two trials, 434 participants, very low quality evidence).• a serious infection, Peto odds ratio 1.29 (95% confidence interval 0.29 to 5.71) (two trials, 434 participants, very low quality evidence);• any perioperative complications, risk ratio 0.24 (95% confidence interval 0.03 to 2.05) (one trial, 65 participants, low quality evidence).There was an increase in the number of people developing circulatory overload in those receiving preoperative transfusions compared to those not receiving preoperative transfusions in one of the two trials, and no events were seen in the other trial (no meta-analysis performed). AUTHORS' CONCLUSIONS There is insufficient evidence from randomised trials to determine whether conservative preoperative blood transfusion is as effective as aggressive preoperative blood transfusion in preventing sickle-related or surgery-related complications in people with HbSS disease. There is very low quality evidence that preoperative blood transfusion may prevent development of acute chest syndrome.Due to lack of evidence this review cannot comment on management for people with HbSC or HbSβ(+) disease or for those with high baseline haemoglobin concentrations.
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Affiliation(s)
- Lise J Estcourt
- NHS Blood and TransplantHaematology/Transfusion MedicineLevel 2, John Radcliffe HospitalHeadingtonOxfordUKOX3 9BQ
| | - Patricia M Fortin
- NHS Blood and TransplantSystematic Review InitiativeJohn Radcliffe HospitalOxfordUKOX3 9BQ
| | - Marialena Trivella
- University of OxfordCentre for Statistics in MedicineBotnar Research CentreWindmill RoadOxfordUKOX3 7LD
| | - Sally Hopewell
- University of OxfordOxford Clinical Trials Research UnitNDORMSWindmill RoadOxfordOxfordshireUKOX3 7LD
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Muroni M, Loi V, Lionnet F, Girot R, Houry S. Prophylactic laparoscopic cholecystectomy in adult sickle cell disease patients with cholelithiasis: A prospective cohort study. Int J Surg 2015; 22:62-6. [PMID: 26278661 DOI: 10.1016/j.ijsu.2015.07.708] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/01/2015] [Revised: 07/09/2015] [Accepted: 07/29/2015] [Indexed: 12/15/2022]
Abstract
INTRODUCTION Prophylactic laparoscopic cholecystectomy remains controversial and has been discussed for selected subgroups of patients with asymptomatic cholelithiasis who are at high risk of developing complications such as chronic haemolytic conditions. Cholelithiasis is a frequent condition for patients with sickle cell disease (SCD). Complications from cholelithiasis may dramatically increase morbidity for these patients. Our objective was to evaluate the effectiveness of prophylactic cholecystectomy in SCD patients with asymptomatic gallbladder stones. METHODS From January 2000 to June 2014, we performed 103 laparoscopic cholecystectomies on SCD patients. Fifty-two patients had asymptomatic cholelithiasis. The asymptomatic patients were prospectively enrolled in this study, and all underwent a prophylactic cholecystectomy with an intraoperative cholangiography. The symptomatic patients were retrospectively studied. Upon admission, all patients were administered specific perioperative management including intravenous hydration, antibiotic prophylaxis, oxygenation, and intravenous painkillers, as well as the subcutaneous administration of low-molecular-weight heparin. During the same period, 51 patients with SCD underwent a cholecystectomy for symptomatic cholelithiasis. We compared these 2 groups in terms of postoperative mortality, morbidity, and hospital stay. RESULTS There were no postoperative deaths or injuries to the bile ducts in either group. In the asymptomatic group, we observed 6 postoperative complications (11.5%), and in the symptomatic group, there were 13 (25.5%) postoperative complications. DISCUSSION Regarding the SCD complications, we observed 1 case (2%) of acute chest syndrome in an asymptomatic cholelithiasis patient, while there were 3 cases (6%) in the symptomatic group. Vaso-occlusive crisis was observed in 1 patient (2%) with asymptomatic cholelithiasis, and in 4 patients (8%) in the other group. The mean hospital stay averaged 5.8 (4-17) days for prophylactic cholecystectomy and 7.96 (4-18) days for the comparative symptomatic group. CONCLUSIONS Postoperative complications related to SCD were less frequent for asymptomatic patients who had a laparoscopic prophylactic cholecystectomy. This intervention, if performed with perioperative specific management, is safe and helps avoid emergency operations for acute complications including cholecystitis, choledocholithiasis, and cholangitis. For SCD patients, a prophylactic cholecystectomy reduces hospital stays.
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Affiliation(s)
- Mirko Muroni
- Hôpital Tenon, Department of Surgery, 4 rue de la Chine, 75020, Paris, France.
| | - Valeria Loi
- Hôpital Tenon, Department of Surgery, 4 rue de la Chine, 75020, Paris, France.
| | - François Lionnet
- Hôpital Tenon, Department of Hematology, 4 rue de la Chine, 75020, Paris, France.
| | - Robert Girot
- Hôpital Tenon, Department of Hematology, 4 rue de la Chine, 75020, Paris, France.
| | - Sidney Houry
- Hôpital Tenon, Department of Surgery, 4 rue de la Chine, 75020, Paris, France.
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Agresta F, Campanile FC, Vettoretto N, Silecchia G, Bergamini C, Maida P, Lombari P, Narilli P, Marchi D, Carrara A, Esposito MG, Fiume S, Miranda G, Barlera S, Davoli M. Laparoscopic cholecystectomy: consensus conference-based guidelines. Langenbecks Arch Surg 2015; 400:429-53. [PMID: 25850631 DOI: 10.1007/s00423-015-1300-4] [Citation(s) in RCA: 75] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/05/2015] [Accepted: 03/24/2015] [Indexed: 12/21/2022]
Abstract
INTRODUCTION Laparoscopic cholecystectomy (LC) is the gold standard technique for gallbladder diseases in both acute and elective surgery. Nevertheless, reports from national surveys still seem to represent some doubts regarding its diffusion. There is neither a wide consensus on its indications nor on its possible related morbidity. On the other hand, more than 25 years have passed since the introduction of LC, and we have all witnessed the exponential growth of knowledge, skill and technology that has followed it. In 1995, the EAES published its consensus statement on laparoscopic cholecystectomy in which seven main questions were answered, according to the available evidence. During the following 20 years, there have been several additional guidelines on LC, mainly focused on some particular aspect, such as emergency or concomitant biliary tract surgery. METHODS In 2012, several Italian surgical societies decided to revisit the clinical recommendations for the role of laparoscopy in the treatment of gallbladder diseases in adults, to update and supplement the existing guidelines with recommendations that reflect what is known and what constitutes good practice concerning LC.
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Affiliation(s)
- Ferdinando Agresta
- Department of Surgery, Presidio Ospedaliero di Adria (RO), Adria, RO, Italy,
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14
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Alotaibi GS, Alsaleh K, Bolster L, Sean McMurtry M, Wu C. Preoperative transfusion in patients with sickle cell disease to prevent perioperative complications: A systematic review and meta-analysis. Hematology 2014; 19:463-71. [DOI: 10.1179/1607845414y.0000000158] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/31/2022] Open
Affiliation(s)
| | - Khalid Alsaleh
- Department of MedicineKing Saud University, Riyadh, Saudi Arabia
| | - Lauren Bolster
- Department of MedicineUniversity of Alberta, Edmonton, AB, Canada
| | - M. Sean McMurtry
- Department of MedicineUniversity of Alberta, Edmonton, AB, Canada
| | - Cynthia Wu
- Department of MedicineUniversity of Alberta, Edmonton, AB, Canada
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