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Donadieu A, Alhammadi F, Mettoudi A, Garois A, Kianmanesh R, Tashkandi A, Renard Y. Preoperative progressive pneumoperitoneum: insights on implementation in an ambulatory care setting. How I do it? Hernia 2025; 29:82. [PMID: 39899063 DOI: 10.1007/s10029-024-03253-z] [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: 01/03/2024] [Accepted: 12/15/2024] [Indexed: 02/04/2025]
Abstract
INTRODUCTION Incisional hernias with loss of domain (IHLD) are challenging to treat. Preoperative techniques like botulinum toxin injection (BTA) and preoperative progressive pneumoperitoneum (PPP) are highly effective, potentially preventing the need for perioperative component separation in the vast majority of cases. PPP involves preoperative introduction of gas into the abdominal cavity to increase the abdominal wall volume, aiding diaphragmatic prehabilitation and hernia reintegration. This study aimed at explaining our technique in performing PPP in ambulatory setting. DESCRIPTION OF THE TECHNIQUE The first insufflation and BTA injection occur during a 3-day hospitalization. Subsequently, patients are managed on an ambulatory basis with three sessions per week for at least three weeks. Each hospital visit lasts about 1 to 2 h. Patients can remain at home or in a residential center of our hospital. No preventive anticoagulation nor prophylactic antibiotics are needed. DISCUSSION Performing PPP in outpatient care does not compromise its efficacy. Instead, it allows for longer preparation, potentially improving efficacy. Patients maintain daily activities, possibly yielding better results than traditional physiotherapy. It reduces hospital stay costs and nosocomial infection risks. Each ambulatory hospitalization offers better patient attention. CONCLUSIONS PPP is a valuable preoperative technique for IHLD repair, particularly in combination with botulinum toxin, offering potential benefits for selected patients. Performing it in outpatient care may enhance patient satisfaction and offers several advantages.
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Affiliation(s)
- Alix Donadieu
- Department of General, Digestive and Endocrine Surgery, University of Reims Champagne-Ardenne, Robert-Debré University Hospital, Reims, France
- University of Reims Champagne-Ardenne, Laboratoire d'Informatique en Calcul Intensif et Image pour la Simulation (LICIIS), Reims, France
| | - Fahad Alhammadi
- Department of General, Digestive and Endocrine Surgery, University of Reims Champagne-Ardenne, Robert-Debré University Hospital, Reims, France
- General Surgery Department, Al-Adan Hospital, Hadiya, Kuwait
| | - Alicia Mettoudi
- Department of General, Digestive and Endocrine Surgery, University of Reims Champagne-Ardenne, Robert-Debré University Hospital, Reims, France
| | - Annie Garois
- Department of General, Digestive and Endocrine Surgery, University of Reims Champagne-Ardenne, Robert-Debré University Hospital, Reims, France
| | - Reza Kianmanesh
- Department of General, Digestive and Endocrine Surgery, University of Reims Champagne-Ardenne, Robert-Debré University Hospital, Reims, France
| | - Ahmad Tashkandi
- Department of General, Digestive and Endocrine Surgery, University of Reims Champagne-Ardenne, Robert-Debré University Hospital, Reims, France
- Faculty of Medicine, Department of Surgery, University of Jeddah, Jeddah, Saudi Arabia
| | - Yohann Renard
- Department of General, Digestive and Endocrine Surgery, University of Reims Champagne-Ardenne, Robert-Debré University Hospital, Reims, France.
- University of Reims Champagne-Ardenne, Laboratoire d'Informatique en Calcul Intensif et Image pour la Simulation (LICIIS), Reims, France.
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Nachtergaele S, Khalil H, Martre P, Baste JM, Roussel E. Area of Focus in 3D Volumetry and Botulinum Toxin A Injection for Giant Diaphragmatic Hernia with Loss of Domain: A Case Report with Video Illustration. JOURNAL OF ABDOMINAL WALL SURGERY : JAWS 2024; 3:13448. [PMID: 39310670 PMCID: PMC11412849 DOI: 10.3389/jaws.2024.13448] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 06/25/2024] [Accepted: 08/26/2024] [Indexed: 09/25/2024]
Abstract
Background Chronic giant diaphragmatic hernia is a severe disease with challenging diagnosis and treatment. Given the risk of loss of domain, the use of botulinum toxin A is an option but has been minimally studied in diaphragmatic hernia surgery. Case Report We present a case of a giant diaphragmatic hernia in a 66-years-old patient who showed a 12-year history of progressive chronic respiratory insufficiency. There were not notion of traumatic injuries. The CT-scan showed a giant diaphragmatic hernia with herniation of small bowel, right liver, omentum and transverse colon. Method We assessed the risk of loss of domain using a 3D volumetry based on the Sabbagh score and decided to use Botox injection before laparoscopic reduction of the hernia due to the high risk of complications related to the loss of domain. A computed tomography was performed 24 months after surgery and showed no evidence of recurrence. The patient presented an excellent functional result with a normal physical activity. Conclusion This report is among the first to highlight the utility of 3D reconstruction in assessing the risk associated with loss of domain and in preparing the abdominal wall with botulinum toxin A for diaphragmatic hernia repair.
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Affiliation(s)
- Sylvie Nachtergaele
- Department of Digestive Surgery, Cliniques Universitaires St. Luc (UCL), Brussels, Belgium
| | - Haitham Khalil
- Department of Digestive Surgery, Rouen University Hospital, Rouen, France
| | - Paul Martre
- Department of Digestive Surgery, Hôpital Privé de l’Estuaire, Groupe Ramsay, Le Havre, France
| | - Jean-Marc Baste
- Department of General and Thoracic Surgery and INSERM U1096, Rouen University Hospital, Rouen, France
| | - Edouard Roussel
- Department of Digestive Surgery, Rouen University Hospital, Rouen, France
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Van Hoef S, Dries P, Allaeys M, Eker HH, Berrevoet F. Intra-abdominal hypertension and compartment syndrome after complex hernia repair. Hernia 2024; 28:701-709. [PMID: 38568348 DOI: 10.1007/s10029-024-02992-3] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/06/2023] [Accepted: 02/10/2024] [Indexed: 07/16/2024]
Abstract
PURPOSE Abdominal compartment syndrome (ACS) is a well-known concept after trauma surgery or after major abdominal surgery in critically ill patients. However, ACS as a complication after complex hernia repair is considered rare and supporting literature is scarce. As complexity in abdominal wall repair increases, with the introduction of new tools and advanced techniques, ACS incidence might rise and should be carefully considered when dealing with complex abdominal wall hernias. In this narrative review, a summary of the current literature will highlight several key features in the diagnosis and management of ACS in complex abdominal wall repair and discuss several treatment options during the different steps of complex AWR. METHODS We performed a literature search across PubMed using the search terms: "Abdominal Compartment syndrome," "Intra-abdominal pressure," "Complex abdominal hernia," and "Ventral hernia." Articles corresponding to these search terms were individually reviewed by primary author and selected on relevance. CONCLUSION Intra-abdominal hypertension (IAH) and ACS require imperative attention and should be carefully considered when dealing with complex abdominal wall hernias, even without significant loss of domain. Development of a true abdominal compartment syndrome is relatively rare, but is a devastating complication and should be prevented at all cost. Current evidence on surgical treatment of ACS after hernia repair is scarce, but conservative management might be an option in the early phase and low grades of IAH. However, life-saving treatment by relaparotomy and open abdomen management should be initiated when ACS starts setting in.
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Affiliation(s)
- S Van Hoef
- Department of General and HPB Surgery and Liver Transplantation, Ghent University Hospital, Ghent, Belgium.
| | - P Dries
- Department of General and HPB Surgery and Liver Transplantation, Ghent University Hospital, Ghent, Belgium
| | - M Allaeys
- Department of General and HPB Surgery and Liver Transplantation, Ghent University Hospital, Ghent, Belgium
| | - H H Eker
- Department of General and HPB Surgery and Liver Transplantation, Ghent University Hospital, Ghent, Belgium
| | - F Berrevoet
- Department of General and HPB Surgery and Liver Transplantation, Ghent University Hospital, Ghent, Belgium
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Serafio-Gómez JL, Aragón-Quintana C, Bustillos-Ponce M, Varela-Barraza O, Silva B. Effective Management of Giant Ventral Hernias: A Comprehensive Approach Combining Preoperative Botulinum Toxin Application, Modified Ramírez's Component Separation, and Rives-Stoppa Hernioplasty. Cureus 2023; 15:e48967. [PMID: 38024062 PMCID: PMC10659588 DOI: 10.7759/cureus.48967] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 11/17/2023] [Indexed: 12/01/2023] Open
Abstract
Introduction Giant ventral hernias are a surgical challenge due to their size and the need for a specialized approach during repair. Over the decades, abdominal wall surgery has evolved into a sophisticated field with a wide range of techniques aimed at improving patient outcomes. However, there is no universally accepted method suitable for repairing all giant ventral hernias. Surgeons must rely on a combination of techniques, choosing the approach that best matches their expertise, available resources, and the individual patient's specific needs. This article explores the effective use of a combination of techniques, including preoperative botulinum toxin application, modified Ramírez's component separation, and Rives-Stoppa hernioplasty, yielding excellent results and minimizing recurrences. Objective This study aims to provide a comprehensive literature review of giant ventral hernias. Additionally, we aim to share our experience in managing and repairing giant ventral hernias using a multi-modal approach, combining various surgical techniques with a focus on patient safety, reduced recurrence rates, and improved quality of life. Methods Between October 1, 2019, and October 1, 2021, six patients with giant ventral hernias were enrolled at our department of surgery. They received preoperative botulinum toxin A (BT) application, underwent corrective surgery involving modified component separation following the Ramírez method, and received Rives-Stoppa hernioplasty. Follow-up was conducted for at least six months. Results Six patients were included in the study: three women and three men. They had an average age of 53.6 years and an average body mass index of 31.8 kg/m2. The most common location of the hernia defect was supra and infraumbilical, among 66% of cases. The primary adverse effect associated with BT application was abdominal distension, reported in 33% of patients. No postoperative complications, such as abscesses or seromas, were observed. After the surgical procedure, the average hospital stay was 2.6 days, and no recurrences were noted within six months post-surgery. Conclusion The proposed method, which involves a combination of techniques, has demonstrated promising results based on our experience. However, to solidify these findings and better understand the full scope of this approach, further comprehensive statistical studies involving larger populations are essential. These studies will not only validate our results but also provide valuable insights for optimizing the management of giant ventral hernias.
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Affiliation(s)
- José Luis Serafio-Gómez
- General Surgery, Chihuahua City General Hospital "Dr. Salvador Zubirán Anchondo", Chihuahua, MEX
| | - César Aragón-Quintana
- General Surgery, Chihuahua City General Hospital "Dr. Salvador Zubirán Anchondo", Chihuahua, MEX
| | - Melanie Bustillos-Ponce
- General Medicine, Chihuahua City General Hospital "Dr. Salvador Zubirán Anchondo", Chihuahua, MEX
| | - Omar Varela-Barraza
- General Surgery, Hospital Regional de Alta Especialidad del Bajío, León, MEX
| | - Beatriz Silva
- General Medicine, Chihuahua City General Hospital "Dr. Salvador Zubirán Anchondo", Chihuahua, MEX
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Subirana H, Comas J, Crusellas O, Robres J, Barri J, Domenech A, Borlado C, Castellví J. Preoperative Progressive Pneumoperitoneum in the Treatment of Hernias With Loss of Domain. Our Experience in 50 Cases. JOURNAL OF ABDOMINAL WALL SURGERY : JAWS 2023; 2:11230. [PMID: 38312417 PMCID: PMC10831681 DOI: 10.3389/jaws.2023.11230] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/30/2023] [Accepted: 03/27/2023] [Indexed: 02/06/2024]
Abstract
Introduction: Surgical planning for repair of giant hernias with loss of domain needs to consider patient comorbidities, potential risks and possible postoperative complications. Some postoperative complications are related to the increase in intra-abdominal pressure caused by the reintroduction of abdominal contents into the peritoneal space. Preoperative progressive pneumoperitoneum (PPP) increases the capacity of abdominal cavity prior to hernia repair and allows for better physiological postoperative adaptation. The aim of this study is to analyze perioperative and intraoperative characteristics as well as outcomes of a cohort of patients treated with PPP prior to giant hernia repair at a single, high volume center. Methods: Prospective, descriptive, observational single-center study including 50 patients undergoing PPP prior to hernia with loss of domain repair between January 2005 and June 2022. We analysed epidemiological, surgical and safety variables. Results: Fifty patients were included: 43 incisional hernias, 6 inguinal hernias and 1 umbilical hernia. Mean age was 66 years (36-85). Median insufflation time was 12 days (4-20) and median insufflated volume of ambient air was 10,036 cc. There were complications during PPP in nine patients: 2 decompensation of chronic respiratory disease and 7 subcutaneous emphysema. PPP was prematurely suspended in patients with respiratory decompensation. All patients with incisional and umbilical hernias underwent open repair with mesh placement. Preperitoneal repair was performed in inguinal hernias. Three cases of hernia recurrence were reported during the follow up. Conclusion: PPP is a safe and effective tool in the preoperative management of patients with giant hernias. It helps to achieve the decrease or absence of abdominal wall tension and can favour the results of complex eventroplasty techniques.
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Affiliation(s)
- Helena Subirana
- Hospital of Sant Joan Despí Moisès Broggi, Sant Joan Despi, Spain
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Elstner KE, Moollan Y, Chen E, Jacombs ASW, Rodriguez-Acevedo O, Ibrahim N, Ho-Shon K, Magnussen J, Read JW. Preoperative Progressive Pneumoperitoneum Revisited. Front Surg 2021; 8:754543. [PMID: 34733881 PMCID: PMC8559773 DOI: 10.3389/fsurg.2021.754543] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/06/2021] [Accepted: 09/17/2021] [Indexed: 12/05/2022] Open
Abstract
Incisional hernia represents a common and potentially serious complication of open abdominal surgery, with up to 20% of all patients undergoing laparotomy subsequently developing an incisional hernia. This incidence increases to as much as 35% for laparotomies performed in high-risk patients and emergency procedures. A rarely used technique for enabling closure of large ventral hernias with loss of domain is preoperative progressive pneumoperitoneum (PPP), which uses intermittent insufflation to gradually stretch the contracted abdominal wall muscles, increasing the capacity of the abdominal cavity and allowing viscera to re-establish right of domain. This assists in tension-free closure of giant hernias which may otherwise be considered inoperable. This technique may be used on its own, or in conjunction with preoperative Botulinum Toxin A to confer paralysis to the lateral oblique muscles. These two complementary techniques, are changing the way complex hernias are managed.
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Affiliation(s)
- Kristen E Elstner
- Department of Surgery, Macquarie University Hospital, Macquarie University, Sydney, NSW, Australia.,Hernia Institute Australia, Edgecliff, NSW, Australia
| | - Yusuf Moollan
- Department of Surgery, Macquarie University Hospital, Macquarie University, Sydney, NSW, Australia.,Hernia Institute Australia, Edgecliff, NSW, Australia
| | - Emily Chen
- Department of Surgery, Royal Brisbane and Women's Hospital, Herston, QLD, Australia
| | - Anita S W Jacombs
- Department of Surgery, Macquarie University Hospital, Macquarie University, Sydney, NSW, Australia.,Hernia Institute Australia, Edgecliff, NSW, Australia
| | | | - Nabeel Ibrahim
- Department of Surgery, Macquarie University Hospital, Macquarie University, Sydney, NSW, Australia.,Hernia Institute Australia, Edgecliff, NSW, Australia
| | - Kevin Ho-Shon
- Macquarie Medical Imaging, Macquarie University Hospital, Macquarie University, Sydney, NSW, Australia
| | - John Magnussen
- Macquarie Medical Imaging, Macquarie University Hospital, Macquarie University, Sydney, NSW, Australia
| | - John W Read
- Macquarie Medical Imaging, Macquarie University Hospital, Macquarie University, Sydney, NSW, Australia
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van Rooijen MMJ, Yurtkap Y, Allaeys M, Ibrahim N, Berrevoet F, Lange JF. Fascial closure in giant ventral hernias after preoperative botulinum toxin a and progressive pneumoperitoneum: A systematic review and meta-analysis. Surgery 2021; 170:769-776. [PMID: 33888320 DOI: 10.1016/j.surg.2021.03.027] [Citation(s) in RCA: 17] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/16/2021] [Revised: 03/01/2021] [Accepted: 03/09/2021] [Indexed: 12/17/2022]
Abstract
BACKGROUND The primary objective was to assess the perioperative efficacy of the preoperative use of progressive pneumoperitoneum or Botulinum Toxin A injections in ventral hernia repair. METHODS Embase, Medline Ovid, Web of Science, Cochrane Central, and Google Scholar were systematically searched. Studies in English reporting on fascial closure, indications, complications or postoperative outcomes in adult patients that had undergone progressive pneumoperitoneum, Botulinum Toxin A injections, or both before ventral hernia repair were included. Study quality was assessed with the Oxford Levels of Evidence guidelines and the Methodological Index for Non-Randomized Studies criteria. A pooled fascial closure rate and recurrence rate were calculated with random effects models. RESULTS Twenty studies were included from the 905 identified, comprising the use progressive pneumoperitoneum (n = 11), Botulinum Toxin A (n = 6), and both techniques (n = 3). The overall fascial closure rate was 0.94 (95% confidence interval 0.89-0.98). Indications for the use of progressive pneumoperitoneum or Botulinum Toxin A were based on objective (eg, computed tomography measurements) or subjective measures (eg, foreseen surgical problems). In contrast to the use of Botulinum Toxin A, reported complications with the use of progressive pneumoperitoneum were ample and sometimes severe. The cumulative reported recurrence rate was 0.03 (95% confidence interval 0.01-0.06). CONCLUSION Preoperative progressive pneumoperitoneum and Botulinum Toxin A can facilitate fascial closure without causing significant numbers of adverse events. Botulinum Toxin A qualifies for low-threshold use, yet progressive pneumoperitoneum should be used cautiously owing to a larger number of complications. Definitive recommendations cannot be made as the quality of included studies is low, bias is present, and comparative information is scarce. Registration number Information about the design and conduct of this systematic review has been registered on PROSPERO, registration number CRD42020181679.
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Affiliation(s)
| | - Yagmur Yurtkap
- Department of Surgery, Erasmus University Medical Center, Rotterdam, The Netherlands
| | - Mathias Allaeys
- Department of General and HPB Surgery and Liver Transplantation, University Hospital Ghent, Ghent, Belgium
| | - Nabeel Ibrahim
- Department of Clinical Medicine, Macquarie University Hospital, Macquarie, Australia; Hernia Institute Australia, Edgecliff, Australia
| | - Frederik Berrevoet
- Department of General and HPB Surgery and Liver Transplantation, University Hospital Ghent, Ghent, Belgium
| | - Johan F Lange
- Department of Surgery, Erasmus University Medical Center, Rotterdam, The Netherlands; Department of Surgery, IJsselland Hospital, Capelle aan den IJssel, The Netherlands
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Adjunct botox to preoperative progressive pneumoperitoneum for incisional hernia with loss of domain: no additional effect but may improve outcomes. Hernia 2021; 25:1507-1517. [PMID: 33686553 DOI: 10.1007/s10029-021-02387-8] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/10/2021] [Accepted: 02/26/2021] [Indexed: 12/12/2022]
Abstract
INTRODUCTION Incisional hernia with loss of domain (IHLD) remains a surgical challenge. Its management requires complex approaches including specific preoperative and intra-operative techniques. This study focuses on the interest of adding preoperative botulinum toxin A (BTA) injection to preoperative progressive pneumoperitoneum (PPP), compared to PPP alone. MATERIAL Patients between January 2015 and March 2020 with IHLD who underwent pre-operative preparation were included. Their baseline characteristics were retrospectively analyzed, along with the characteristics of their incisional hernia before and after preparation including CT-scan volumetry. Intra-operative data, early post-operative outcomes, surgical site occurrences (SSOs) including surgical site infection (SSI) were recorded. RESULTS Four hundred and fifty (450) patients with incisional hernia were operated, including 41 patients (9.1%) with IHLD, 13 of which had both BTA and PPP, while 28 had PPP only. Both groups were comparable in term of patients and IHLD characteristics. Median increase in the volume of the abdominal cavity (VAbC) was + 55% for the entire population (+ 58.3% for the BTA-PPP group, p < 0.0001 and + 52.8% for the PPP-alone group, p < 0.0001) although the increase in volume was not different between the two groups (p = 0.99). Complete fascial closure was achieved in all patients. SSOs were more frequent in the PPP-alone group than in the BTA-PPP group (17 (60.7%) versus 3 (23.1%) patients, respectively, p = 0.043). CONCLUSION BTA and PPP are both useful in pre-operative preparation for IHLD. Combining both significantly increases the volume of abdominal cavity but associating BTA to PPP does not add any volumetric benefit but may decrease the post-operative SSO rate.
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Moyón C FX, Molina GA, Rojas CL, Moyón C MA, Tufiño JF, Cárdenas A, Mafla OL, Camino JE, Basantes LE, Villacis MS. Obesity and ventral hernia in the context of drug addiction and mental instability: a complex scenario successfully treated with preoperative progressive pneumoperitoneum. J Surg Case Rep 2020. [DOI: 10.1093/jscr/rjaa261] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
Abstract
Surgery in loss of domain hernia can result in high morbidity and mortality. Chronic muscle retraction along with the reduced volume of the peritoneal cavity can lead to potential problems such as abdominal compartment syndrome, ventilatory restriction and an elevated risk of hernia recurrence. This is affected even further by obesity; a high body mass index is strongly associated with poor outcomes after ventral hernia repair. In these individuals, preoperative preparation is vital as it can reduce surgical risks and improve patients’ outcomes. There are many strategies available. Nonetheless, an individualized case approach by a multidisciplinary team is crucial to accurately treat this troublesome pathology. We present the case of a 41-year-old obese patient with a loss of domain ventral hernia. As he had a drug addiction and several psychologic difficulties, a tailored approach was needed to successfully treat the hernia. After preoperative preparation and surgery, the patient underwent full recovery.
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Affiliation(s)
- F Xavier Moyón C
- Department of General Surgery, Hospital San Francisco de Quito, IESS, Quito-Ecuador
| | - Gabriel A Molina
- Department of General Surgery, Hospital IESS Quito Sur, Quito-Ecuador and Universidad Internacional del Ecuador
| | - Christian L Rojas
- Department of General Surgery, Hospital San Francisco de Quito, IESS, Quito-Ecuador
| | - Miguel A Moyón C
- Department of General Surgery, Hospital San Francisco de Quito, IESS, Quito-Ecuador
| | - Jorge F Tufiño
- Department of General Surgery, Hospital San Francisco de Quito, IESS, Quito-Ecuador
| | - Andrés Cárdenas
- Department of General Surgery, Hospital San Francisco de Quito, IESS, Quito-Ecuador
| | | | | | - Ligia Elena Basantes
- Department of Internal Medicine, Division of Gastroenterology, Hospital IESS Quito Sur, Quito-Ecuador
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