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Yamanaka K, Kawabata R, Hamaguchi M, Chomei S, Inoue T, Hasegawa S, Tsujimoto T, Koda Y, Miyahara S, Takahashi H, Okada T, Yamaguchi M, Okada K. Open Conversion with Explantation of Stent Grafts After Endovascular Aneurysm Repair for Abdominal Aortic Aneurysm. Ann Vasc Surg 2024; 104:38-47. [PMID: 37536432 DOI: 10.1016/j.avsg.2023.07.094] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/11/2023] [Revised: 07/04/2023] [Accepted: 07/06/2023] [Indexed: 08/05/2023]
Abstract
BACKGROUND Although endovascular aneurysm repair (EVAR) for abdominal aortic aneurysm (AAA) is widely used worldwide, the fact that it is associated with increased rates of reintervention has been considered a problem. This study aimed to analyze the outcomes of primary open AAA repair and open conversion with explantation of stent grafts after EVAR. METHODS In this retrospective study, we enrolled 1,120 patients (open repair, n = 664; EVAR, n = 456) who underwent AAA repair at Kobe University from 1999 to 2019. Of the 664 patients who underwent open repair, 121 (patients who underwent primary open repair (POR) as a concomitant procedure and patients with ruptured AAA) were excluded from the study. The outcomes of POR were compared with those of open conversion with explantation of stent grafts. RESULTS Of the 543 patients who underwent open repair, 513 underwent POR and 30 underwent open conversion with explantation of stent grafts. The operation time for POR was significantly less than that for open conversion with explantation. During surgery, patients who underwent open conversion with explantation required significantly more transfusions of red cell concentrate, fresh frozen plasma, and platelet concentrate than those who underwent POR. Overall, 30 patients who underwent open conversion with explantation required a total of 48 reinterventions before surgery. Hospital mortality rates were 0.7% and 0% in the POR and open conversion with explantation groups, respectively (P = 0.62). Although overall survival at 5 years in the POR group was significantly better than that in the open conversion with explantation group (89.3 ± 1.7% vs. 79.5 ± 9.6%; P = 0.01), there were no significant differences between the 2 groups regarding the freedom from aortic event (hospital death, reintervention, and aortic death). According to the multivariate analysis, open conversion with explantation was not an independent risk factor for late death. There were 20 patients who were hesitant to undergo OCE, although we recommended OCE. In a subgroup analysis, the overall mean cost borne by patients who underwent EVAR was approximately 2.3 times higher compared with that borne by patients who underwent POR. CONCLUSIONS Although demanding, both early and long-term outcomes of OCE have been favorable in our present study. OCE is highly recommended in patients with persistent sac enlargement after EVAR.
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Affiliation(s)
- Katsuhiro Yamanaka
- Division of Cardiovascular Surgery, The Department of Surgery, University of Kobe, Kobe, Japan
| | - Ryo Kawabata
- Division of Cardiovascular Surgery, The Department of Surgery, University of Kobe, Kobe, Japan
| | - Mari Hamaguchi
- Division of Cardiovascular Surgery, The Department of Surgery, University of Kobe, Kobe, Japan
| | - Shunya Chomei
- Division of Cardiovascular Surgery, The Department of Surgery, University of Kobe, Kobe, Japan
| | - Taishi Inoue
- Division of Cardiovascular Surgery, The Department of Surgery, University of Kobe, Kobe, Japan
| | - Shota Hasegawa
- Division of Cardiovascular Surgery, The Department of Surgery, University of Kobe, Kobe, Japan
| | - Takanori Tsujimoto
- Division of Cardiovascular Surgery, The Department of Surgery, University of Kobe, Kobe, Japan
| | - Yojiro Koda
- Division of Cardiovascular Surgery, The Department of Surgery, University of Kobe, Kobe, Japan
| | - Shunsuke Miyahara
- Division of Cardiovascular Surgery, The Department of Surgery, University of Kobe, Kobe, Japan
| | - Hiroaki Takahashi
- Division of Cardiovascular Surgery, The Department of Surgery, University of Kobe, Kobe, Japan
| | - Takuya Okada
- The Department of Radiology, University of Kobe, Kobe, Japan
| | | | - Kenji Okada
- Division of Cardiovascular Surgery, The Department of Surgery, University of Kobe, Kobe, Japan.
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Yamanaka K, Hamaguchi M, Chomei S, Inoue T, Kono A, Tsujimoto T, Koda Y, Nakai H, Omura A, Inoue T, Yamaguchi M, Sugimoto K, Okada K. Japanese single-center experience of abdominal aortic aneurysm repair over 20 years: should open or endovascular aneurysm repair be performed first? Surg Today 2023; 53:1116-1125. [PMID: 36961608 PMCID: PMC10519864 DOI: 10.1007/s00595-023-02663-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/03/2022] [Accepted: 02/01/2023] [Indexed: 03/25/2023]
Abstract
PURPOSE The present study analyzed the outcomes of our experience with abdominal aortic aneurysm (AAA) repair over 20 years using endovascular aortic repair (EVAR) with commercially available devices or open aortic repair (OAR) and reviewed our surgical strategy for AAA. METHODS From 1999 to 2019, 1077 patients (659 OAR, 418 EVAR) underwent AAA repair. The OAR and EVAR groups were compared retrospectively, and a propensity matching analysis was performed. RESULTS EVAR was first introduced in 2008. Our strategy was changed to an EVAR-first strategy in 2010. Beginning in 2018, this EVAR-first strategy was changed to an OAR-first strategy. After propensity matching, the overall survival in the OAR group was significantly better than that in the EVAR group at 10 years (p = 0.006). Two late deaths due to AAA rupture were identified in the EVAR group, although there were no significant differences between the OAR and EVAR groups with regard to the freedom from AAA-related death at 10 years. The rate of freedom from aortic events at 10 years was significantly higher in the OAR group than in the EVAR group (p < 0.0001). CONCLUSION The rates of freedom from AAA-related death in both the OAR and EVAR groups were favorable, and the rate of freedom from aortic events was significantly lower in the EVAR group than in the OAR group. Close long-term follow-up after EVAR is mandatory.
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Affiliation(s)
- Katsuhiro Yamanaka
- Division of Cardiovascular Surgery, The Department of Surgery, University of Kobe, Graduate School of Medicine, 7-5-2 Kusunoki-Cho, Chuo-Ku, Kobe, 650-0017, Japan
| | - Mari Hamaguchi
- Division of Cardiovascular Surgery, The Department of Surgery, University of Kobe, Graduate School of Medicine, 7-5-2 Kusunoki-Cho, Chuo-Ku, Kobe, 650-0017, Japan
| | - Shunya Chomei
- Division of Cardiovascular Surgery, The Department of Surgery, University of Kobe, Graduate School of Medicine, 7-5-2 Kusunoki-Cho, Chuo-Ku, Kobe, 650-0017, Japan
| | - Taishi Inoue
- Division of Cardiovascular Surgery, The Department of Surgery, University of Kobe, Graduate School of Medicine, 7-5-2 Kusunoki-Cho, Chuo-Ku, Kobe, 650-0017, Japan
| | - Atsunori Kono
- Division of Cardiovascular Surgery, The Department of Surgery, University of Kobe, Graduate School of Medicine, 7-5-2 Kusunoki-Cho, Chuo-Ku, Kobe, 650-0017, Japan
| | - Takanori Tsujimoto
- Division of Cardiovascular Surgery, The Department of Surgery, University of Kobe, Graduate School of Medicine, 7-5-2 Kusunoki-Cho, Chuo-Ku, Kobe, 650-0017, Japan
| | - Yojiro Koda
- Division of Cardiovascular Surgery, The Department of Surgery, University of Kobe, Graduate School of Medicine, 7-5-2 Kusunoki-Cho, Chuo-Ku, Kobe, 650-0017, Japan
| | - Hidekazu Nakai
- Division of Cardiovascular Surgery, The Department of Surgery, University of Kobe, Graduate School of Medicine, 7-5-2 Kusunoki-Cho, Chuo-Ku, Kobe, 650-0017, Japan
| | - Atsushi Omura
- Division of Cardiovascular Surgery, The Department of Surgery, University of Kobe, Graduate School of Medicine, 7-5-2 Kusunoki-Cho, Chuo-Ku, Kobe, 650-0017, Japan
| | - Takeshi Inoue
- Division of Cardiovascular Surgery, The Department of Surgery, University of Kobe, Graduate School of Medicine, 7-5-2 Kusunoki-Cho, Chuo-Ku, Kobe, 650-0017, Japan
| | | | - Koji Sugimoto
- The Department of Radiology, University of Kobe, Kobe, Japan
| | - Kenji Okada
- Division of Cardiovascular Surgery, The Department of Surgery, University of Kobe, Graduate School of Medicine, 7-5-2 Kusunoki-Cho, Chuo-Ku, Kobe, 650-0017, Japan.
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Nisi F, Carenzo L, Ruggieri N, Reda A, Pascucci MG, Pignataro A, Civilini E, Piccioni F, Giustiniano E. The anesthesiologist's perspective on emergency aortic surgery: Preoperative optimization, intraoperative management, and postoperative surveillance. Semin Vasc Surg 2023; 36:363-379. [PMID: 37330248 DOI: 10.1053/j.semvascsurg.2023.04.017] [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: 02/26/2023] [Revised: 04/23/2023] [Accepted: 04/25/2023] [Indexed: 06/19/2023]
Abstract
The management of emergencies related to the aorta requires a multidisciplinary approach involving various health care professionals. Despite technological advancements in treatment methods, the risks and mortality rates associated with surgery remain high. In the emergency department, definitive diagnosis is usually obtained through computed tomography angiography, and management focuses on controlling blood pressure and treating symptoms to prevent further deterioration. Preoperative resuscitation is the main focus, followed by intraoperative management aimed at stabilizing the patient's hemodynamics, controlling bleeding, and protecting vital organs. After the operation, factors such as organ protection, transfusion management, pain control, and overall patient care must be taken into account. Endovascular techniques are becoming more common in surgical treatment, but they also present new challenges in terms of complications and outcomes. It is recommended that patients with suspected ruptured abdominal aortic aneurysms be transferred to facilities with both open and endovascular treatment options and a track record of successful outcomes to ensure the best patient care and long-term results. To achieve optimal patient outcomes, close collaboration and regular case discussions between health care professionals are necessary, as well as participation in educational programs to promote a culture of teamwork and continuous improvement.
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Affiliation(s)
- Fulvio Nisi
- Department of Anesthesia and Intensive Care Units, IRCCS Humanitas Research Hospital, Via Manzoni 56, 20089, Rozzano, Milan, Italy.
| | - Luca Carenzo
- Department of Anesthesia and Intensive Care Units, IRCCS Humanitas Research Hospital, Via Manzoni 56, 20089, Rozzano, Milan, Italy; Department of Biomedical Sciences, Humanitas University, Pieve Emanuele, Milan, Italy
| | - Nadia Ruggieri
- Department of Anesthesia and Intensive Care Units, IRCCS Humanitas Research Hospital, Via Manzoni 56, 20089, Rozzano, Milan, Italy
| | - Antonio Reda
- Department of Anesthesia and Intensive Care Units, IRCCS Humanitas Research Hospital, Via Manzoni 56, 20089, Rozzano, Milan, Italy
| | | | - Arianna Pignataro
- Vascular Surgery Unit, IRCCS Humanitas Research Hospital, Rozzano, Milan Italy
| | - Efrem Civilini
- Vascular Surgery Unit, IRCCS Humanitas Research Hospital, Rozzano, Milan Italy
| | - Federico Piccioni
- Department of Anesthesia and Intensive Care Units, IRCCS Humanitas Research Hospital, Via Manzoni 56, 20089, Rozzano, Milan, Italy
| | - Enrico Giustiniano
- Department of Anesthesia and Intensive Care Units, IRCCS Humanitas Research Hospital, Via Manzoni 56, 20089, Rozzano, Milan, Italy
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Boucher N, Dreksler H, Hooper J, Nagpal S, MirGhassemi A, Miller E. Anaesthesia for vascular emergencies - a state of the art review. Anaesthesia 2023; 78:236-246. [PMID: 36308289 DOI: 10.1111/anae.15899] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 10/12/2022] [Indexed: 01/11/2023]
Abstract
In this state-of-the-art review, we discuss the presenting symptoms and management strategies for vascular emergencies. Although vascular emergencies are best treated at a vascular surgical centre, patients may present to any emergency department and may require both immediate management and safe transport to a vascular centre. We describe the surgical and anaesthetic considerations for management of aortic dissection, aortic rupture, carotid endarterectomy, acute limb ischaemia and mesenteric ischaemia. Important issues to consider in aortic dissection are extent of the dissection and surgical need for bypasses in addition to endovascular repair. From an anaesthetist's perspective, aortic dissection requires infrastructure for massive transfusion, smooth management should an endovascular procedure require conversion to an open procedure, haemodynamic manipulation during stent deployment and prevention of spinal cord ischaemia. Principles in management of aortic rupture, whether open or endovascular treatment is chosen, include immediate transfer to a vascular care centre; minimising haemodynamic changes to reduce aortic shear stress; permissive hypotension in the pre-operative period; and initiation of massive transfusion protocol. Carotid endarterectomy for carotid stenosis is managed with general or regional techniques, and anaesthetists must be prepared to manage haemodynamic, neurological and airway issues peri-operatively. Acute limb ischaemia is a result of embolism, thrombosis, dissection or trauma, and may be treated with open repair or embolectomy, under either general or local anaesthesia. Due to hypercoagulability, there may be higher numbers of acutely ischaemic limbs among patients with COVID-19, which is important to consider in the current pandemic. Mesenteric ischaemia is a rare vascular emergency, but it is challenging to diagnose and associated with high morbidity and mortality. Several peri-operative issues are common to all vascular emergencies: acute renal injury; management of transfusion; need for heparinisation and reversal; and challenging postoperative care. Finally, the important development of endovascular techniques for repair in many vascular emergencies has improved care, and the availability of transoesophageal echocardiography has improved monitoring as well as aids in surgical placement of endovascular grafts and for post-procedural evaluation.
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Affiliation(s)
- N Boucher
- Department of Anesthesiology and Pain Medicine, University of Ottawa, ON, Canada
| | - H Dreksler
- Division of Vascular Surgery, Department of Surgery, University of Ottawa, ON, Canada
| | - J Hooper
- Department of Anesthesiology and Pain Medicine, University of Ottawa, ON, Canada.,Department of Critical Care, The Ottawa Hospital, University of Ottawa, ON, Canada
| | - S Nagpal
- Division of Vascular Surgery, Department of Surgery, University of Ottawa, ON, Canada
| | - A MirGhassemi
- Department of Anesthesiology and Pain Medicine, University of Ottawa, ON, Canada
| | - E Miller
- Department of Anesthesiology and Pain Medicine, University of Ottawa, ON, Canada
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Titarenko V, Beer A, Schonefeld-Siepmann E, Muschal F, Beyer JK. Giant Symptomatic Unruptured Juxtarenal Abdominal Aortic Aneurysm. Vasc Specialist Int 2022; 38:23. [PMID: 36097707 PMCID: PMC9468660 DOI: 10.5758/vsi.220019] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/21/2022] [Revised: 06/30/2022] [Accepted: 08/10/2022] [Indexed: 12/01/2022] Open
Abstract
Herein, we present the case of an 84-year-old male with a 13-cm, symptomatic, unruptured juxtarenal abdominal aortic aneurysm. This aneurysm was successfully treated with open surgical repair, which was deemed satisfactory at the 3-year follow-up. Despite a paradigm shift towards endovascular techniques in aortic repair, postgraduate training with a focused exposure to open aortic surgery at high-volume centers is essential for future vascular surgeons to safely perform complex aortic repairs with acceptable mortality and morbidity rates.
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Affiliation(s)
- Valentin Titarenko
- Departments of Vascular Surgery, Diagnostik Radiology and Nuclear Medicine, Augusta-Kranken-Anstalt Bochum-Mitte, Bochum, Germany
| | - Anita Beer
- Departments of Vascular Surgery, Diagnostik Radiology and Nuclear Medicine, Augusta-Kranken-Anstalt Bochum-Mitte, Bochum, Germany
| | - Eva Schonefeld-Siepmann
- Departments of Vascular Surgery, Diagnostik Radiology and Nuclear Medicine, Augusta-Kranken-Anstalt Bochum-Mitte, Bochum, Germany
| | - Felix Muschal
- Departments of Interventional, Diagnostik Radiology and Nuclear Medicine, Augusta-Kranken-Anstalt Bochum-Mitte, Bochum, Germany
| | - Jochen Karsten Beyer
- Departments of Vascular Surgery, Diagnostik Radiology and Nuclear Medicine, Augusta-Kranken-Anstalt Bochum-Mitte, Bochum, Germany
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Shiraev TP, de Boer M, Joseph S, Loa J, Qasabian R. Aortic graft explants - A single institution analysis of incidence and outcomes. Vascular 2022; 31:433-440. [PMID: 35103533 DOI: 10.1177/17085381211068219] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Abstract
OBJECTIVES Explantation of both endovascular endovascular aneurysm repair and open aortic grafts is a procedure associated with high peri-operative risk, and the current study sought to determine the outcomes and trends over time in these patients. METHODS This study examined data from all patients undergoing explant of an aortic graft (both open and endovascular) between January 2004 and December 2020 at a single centre. Variables analysed included comorbidities, duration to and indication for explantation, type of revascularization, in-hospital complications and mortality, duration of hospital and ICU stay, and out-patient mortality. RESULTS Of 688 open and 1352 EVARs performed, 46 patients underwent 48 explants. Five were open grafts and 43 were endografts, equating to an explant rate of 0.73% of open and 3.18% EVARs. Average time to explant was 70 months, with patients presenting electively having a significantly longer duration to representation than those presenting emergently (51 vs 44 months, p=0.003). Indication for explant was endoleak in 70%, infection in 23%, and occlusion in 6%. Of the endoleaks, 61% of were Type 1, 22% Type II, 11% Type IV, and 6% Type V. On representation, 17 patients (35%) were symptomatic. Overall mortality rate was 8.3%, with a trend for higher mortality in emergent than elective presentations (11.8 vs 6.5%, p=0.55). There was no change in explant rate over time. CONCLUSIONS Elective aortic graft explantation is associated with low mortality, despite its complexity and patient comorbidities. Patients presenting with symptoms suffered higher mortality and a longer post-operative course, suggesting that aortic graft explantation should be considered sooner rather than later, rather than persisting with repeated endovascular management.
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Affiliation(s)
- Timothy P Shiraev
- Vascular Surgery, 2205Royal Prince Alfred Hospital, Camperdown, New South Wales, Australia.,523002The University of Notre Dame, Sydney
| | - Madeleine de Boer
- Vascular Surgery, 2205Royal Prince Alfred Hospital, Camperdown, New South Wales, Australia
| | - Simon Joseph
- Vascular Surgery, 2205Royal Prince Alfred Hospital, Camperdown, New South Wales, Australia
| | - Jacky Loa
- Vascular Surgery, 2205Royal Prince Alfred Hospital, Camperdown, New South Wales, Australia
| | - Raffi Qasabian
- Vascular Surgery, 2205Royal Prince Alfred Hospital, Camperdown, New South Wales, Australia
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Pomy BJ, Rosenfeld ES, Lala S, Lee KB, Sparks AD, Amdur RL, Ricotta JJ, Sidawy AN, Macsata RA, Nguyen BN. Fenestrated Endovascular Aneurysm Repair Affords Fewer Renal Complications than Open Surgical Repair for Juxtarenal Abdominal Aortic Aneurysms in Patients with Chronic Renal Insufficiency. Ann Vasc Surg 2021; 75:349-357. [PMID: 33831525 DOI: 10.1016/j.avsg.2021.03.026] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/14/2021] [Revised: 02/12/2021] [Accepted: 03/11/2021] [Indexed: 10/21/2022]
Abstract
OBJECTIVE Although fenestrated endovascular aneurysm repair (FEVAR) has been associated with lower morbidity and mortality than open surgical repair (OSR) in juxtarenal aneurysms (JAAA), there is a paucity of data in the literature comparing outcomes of the approaches specifically in patients with chronic renal insufficiency (CRI). We hypothesized that benefits of FEVAR over OSR observed in the general patient population may be diminished in CRI patients due to their heightened vulnerability to renal dysfunction stemming from contrast-induced nephropathy. This study compares 30-day outcomes between FEVAR and OSR for JAAA in patients with non-dialysis dependent CRI. METHODS All adults with estimated glomerular filtration rate (eGFR) < 60 mL/min (but not requiring dialysis) undergoing elective, non-ruptured JAAA repairs were identified in the American College of Surgeons - National Surgical Quality Improvement (ACS-NSQIP) Targeted EVAR and AAA databases from 2012-2018. JAAA were identified by recorded proximal aneurysm extent. FEVAR patients were identified in the Targeted EVAR database as those receiving the "Cook Zenith Fenestrated" endograft. OSR cases were defined as those that required proximal clamp positions "above one renal" or "between SMA & renals." Infra-renal or supra-celiac proximal clamp placement, or cases involving concomitant renal/visceral revascularization were excluded. Thirty-day outcomes including mortality, major adverse cardiovascular events (MACE), pulmonary, and renal complications were compared between FEVAR and OSR groups. RESULTS There were 284 patients with CRI who underwent elective repair of JAAA (FEVAR: 89; OSR: 195). FEVAR patients were significantly older than those undergoing OSR (77.3±7.2 vs. 74.2±7.7, P=0.001) and less likely to be smokers (25.8% vs 42.1%; P = 0.009). Other baseline demographic and pre-operative parameters were comparable between the two groups.Multivariable analysis revealed no significant difference between FEVAR and OSR in 30-day mortality (4.5% vs 4.6%; OR=1.22; 95% CI=0.35 - 4.22; P=0.753) or unplanned re-operation (4.5% vs 5.1%; OR=0.78; 95% CI=0.22 - 2.70; P=0.693). Patients undergoing FEVAR had significantly fewer pulmonary complications (3.4% vs 18.5%; OR=0.12; 95% CI=0.03 - 0.42; P<0.001) and renal dysfunction (3.4% vs 11.8%; OR 0.24 95% CI=0.07 - 0.86; P=0.029) compared to OSR. FEVAR was also associated with significantly shorter ICU and hospital lengths of stay (ICU stay: 0 days vs 3 days, P<0.0001; hospital stay: 3 days vs 8 days, P<0.0001). CONCLUSION For patients with chronic renal insufficiency, FEVAR offered improved perioperative renal morbidity compared to OSR without a corresponding mortality benefit. Future studies will be required to determine long term outcomes of this procedure in this vulnerable population.
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Affiliation(s)
- Benjamin J Pomy
- The George Washington University Department of Surgery, Washington, District of Columbia.
| | - Ethan S Rosenfeld
- The George Washington University Department of Surgery, Washington, District of Columbia
| | - Salim Lala
- The George Washington University Department of Surgery, Washington, District of Columbia
| | - K Benjamin Lee
- The George Washington University Department of Surgery, Washington, District of Columbia
| | - Andrew D Sparks
- The George Washington University Department of Surgery, Washington, District of Columbia
| | - Richard L Amdur
- The George Washington University Department of Surgery, Washington, District of Columbia
| | - John J Ricotta
- The George Washington University Department of Surgery, Washington, District of Columbia
| | - Anton N Sidawy
- The George Washington University Department of Surgery, Washington, District of Columbia
| | - Robyn A Macsata
- The George Washington University Department of Surgery, Washington, District of Columbia
| | - Bao-Ngoc Nguyen
- The George Washington University Department of Surgery, Washington, District of Columbia
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