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Papers by ninh nguyen

Research paper thumbnail of Body Mass Index is Predictive of Higher In-hospital Mortality in Patients Undergoing Laparoscopic Gastric Bypass but Not Laparoscopic Sleeve Gastrectomy or Gastric Banding

The American Surgeon

High body mass index (BMI) has been shown to be a factor predictive of increased morbidity and mo... more High body mass index (BMI) has been shown to be a factor predictive of increased morbidity and mortality in several single-institution studies. Using the University HealthSystem Consortium clinical database, we examined the impact of BMI on in-hospital mortality for patients who underwent laparoscopic gastric bypass, sleeve gastrectomy, and gastric banding between October 2011 and February 2014. Outcomes were examined within each procedure according to BMI groups of 35 to 49.9, 50.0 to 59.9, and 60.0 kg/m2 or greater. Outcome measures included in-hospital mortality, major complications, length of hospital stay, 30-day readmission, and cost. A total of 40,102 bariatric procedures were performed during this time period. For gastric bypass, there was an increase of in-hospital mortality (0.01 and 0.02 vs 0.34%; P < 0.01) and major complications (0.93 and 0.99 vs 2.62%; P < 0.01) in the BMI 60 kg/m2 or greater group. In contrast, sleeve gastrectomy and gastric banding had no assoc...

Research paper thumbnail of Consumer acceptance of irradiated food and information disclosure – A retail imperative

Journal of Retailing and Consumer Services, 2021

Abstract There is substantial contribution in the literature for understanding the complex nature... more Abstract There is substantial contribution in the literature for understanding the complex nature of irradiated foods, the growing importance and the controversial views expended by consumers, yet acceptance of these foods for many have not met with optimal recognition. The study extends the theory of planned behaviour antecedents to analyse independent determinants and the influences of risk and trust. The indirect effects are also examined. The study uses multigroup analyses to identify whether consumer's concerns on information for irradiated foods act as moderators in order to provide a better explanatory power. The data was analysed using Structural Equation Modelling on responses obtained from a sample of 322 consumers. The study found that the theory of planned behaviour antecedents successfully predicted behavioural intention for irradiated foods but with some limitations. The findings also demonstrate additional support to show that the robustness of the TPB framework is effective for irradiated foods and addresses the literature calls on research for more theoretical underpinnings. It further addresses retailer implications, as the ultimate decision falls with retailers who assess whether sales for irradiated foods are acceptable depending on consumer demand.

Research paper thumbnail of Minimally Invasive Resection of Benign Gastric Tumors in Challenging Locations: Prepyloric Region or Gastroesophageal Junction

The American Surgeon, 2013

Benign gastric tumors in a prepyloric location or within 3 cm adjacent of the gastroesophageal ju... more Benign gastric tumors in a prepyloric location or within 3 cm adjacent of the gastroesophageal junction (GEJ) are often challenging to resect using minimally invasive surgical techniques. The aim of this study was to examine the outcomes of patients who underwent minimally invasive enucleation or resection of benign gastric tumors at these difficult locations. The charts of patients undergoing minimally invasive resection of benign-appearing submucosal gastric tumors between June 2001 and December 2012 were reviewed. Data on tumor size and location, type of minimally invasive surgical resection, perioperative complications, 90-day mortality, pathology, and recurrence were collected. A total of 70 consecutive patients underwent laparoscopic resection of benign-appearing submucosal gastric tumors; there were 24 patients with lesions close to the GEJ and nine patients with lesions close to the prepyloric region. All lesions were successfully resected laparoscopically. For prepyloric tu...

Research paper thumbnail of What is a Good Journal? Perceptions of Vietnamese Early-Career and Mid-Career Researchers

Publishing Research Quarterly, 2020

Research paper thumbnail of TEMPORARY REMOVAL: Lipids and Bariatric Procedures Part 1 of 2: Scientific Statement from the National Lipid Association (NLA), American Society for Metabolic and Bariatric Surgery (ASMBS), and Obesity Medicine Association (OMA)

Journal of Clinical Lipidology, 2015

Research paper thumbnail of Laparoscopic gastric ischemic conditioning prior to esophagogastrectomy: technique and review

Surgical innovation, 2008

Esophagectomy can be associated with significant peri-operative morbidity such as leaks and stric... more Esophagectomy can be associated with significant peri-operative morbidity such as leaks and strictures. Gastric ischemia as a result of gastric devascularization is one of the several contributing factors that may play a role in development of these complications. In an attempt to improve gastric tissue perfusion, a technique of gastric ischemic conditioning was proposed. For patients with esophageal cancer and at the time of laparoscopic staging, partial gastric devascularization is achieved by division of the left gastric vessels. Esophagectomy is subsequently performed several days after the gastric ischemic conditioning procedure. Our experience showed that preoperative ligation of left gastric vessels prior to esophagogastrectomy is technically feasible and safe and may decrease ischemic complications such as leaks and strictures.

Research paper thumbnail of A single-port technique for laparoscopic extended stapled appendectomy

Surgical innovation, 2009

Natural orifice translumenal endoscopic surgery (NOTES) has become an exciting area of surgical d... more Natural orifice translumenal endoscopic surgery (NOTES) has become an exciting area of surgical development. Significant limitations to this surgical concept include lack of surgical expertise and appropriate flexible instrumentation. An alternative and competing technology to NOTES is single-incision laparoscopic surgery. This study describes a patient in whom a laparoscopic surgical technique for appendectomy used incisions that were all placed within the umbilicus. The operative time was 40 minutes. There were no intraoperative complications. The patient did well postoperatively and was discharged on postoperative day 1. There were no perioperative complications at 1-month follow-up. Appendectomy performed through laparoscopic incisions placed within the umbilicus was technically feasible and safe. Development of advanced flexible instrumentation and visualization platform may facilitate this new operative approach.

Research paper thumbnail of Preoperative dehydration increases risk of postoperative acute renal failure in colon and rectal surgery

Journal of gastrointestinal surgery : official journal of the Society for Surgery of the Alimentary Tract, 2014

There is limited data regarding the effects of preoperative dehydration on postoperative renal fu... more There is limited data regarding the effects of preoperative dehydration on postoperative renal function. We sought to identify associations between hydration status before operation and postoperative acute renal failure (ARF) in patients undergoing colorectal resection. The NSQIP database was used to examine the data of patients undergoing colorectal resection from 2005 to 2011. We used preoperative blood urea nitrogen (BUN)/creatinine ratio >20 as a marker of relative dehydration. Multivariate analysis using logistic regression was performed to quantify the association of BUN/Cr ratio with ARF. We sampled 27,860 patients who underwent colorectal resection. Patients with dehydration had higher risk of ARF compared to patients with BUN/Cr <10 (AOR, 1.23; P = 0.04). Dehydration was associated with an increase in mortality of the affected patients (AOR, 2.19; P < 0.01). Postoperative complication of myocardial infarction (MI) (AOR, 1.46; P < 0.01) and cardiac arrest (AOR, 1...

Research paper thumbnail of Does Hospital Accreditation Impact Bariatric Surgery Safety?

Research paper thumbnail of Bariatric surgery in the elderly: 2009–2013

Surgery for Obesity and Related Diseases, 2015

Ample evidence supports the safety and effectiveness of bariatric surgery in the general adult po... more Ample evidence supports the safety and effectiveness of bariatric surgery in the general adult population but more information is needed in patients age 60 years and older (elderly). We previously examined the outcome of bariatric surgery performed in the elderly between 1999 and 2005 using the University HealthSystem Consortium (UHC) Clinical Database. The aim of this study was to analyze contemporary outcomes of bariatric surgery in the elderly and to compare them to previous data from 1999-2005. Using International Classification of Diseases, 9(th) Revision diagnosis and procedure codes, we obtained data from the UHC database for all elderly (age &amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;gt;60 yr) and adult nonelderly (age 19-60 yr) patients who underwent bariatric surgery for the treatment of morbid obesity between 2009 and 2013. Outcome measures, such as patient characteristics, LOS, morbidity, and observed-to-expected (risk-adjusted) mortality ratio were compared between elderly and nonelderly patients. Bariatric surgery in the elderly made up 2.7% of all bariatric operations in 1999-2005. This represents an increase to 10.1% of all bariatric operations in 2009-2013. In-hospital mortality was .30% for the nonelderly and .70% for the elderly in 1999-2005, whereas contemporary in-hospital mortality has decreased to .11% for the nonelderly and .05% for the elderly. Our results show that the number of bariatric procedures performed in the elderly is increasing and now represents 10% of all bariatric operations performed at academic centers. In-hospital mortality in bariatric surgery in the elderly has improved so much that it is now even better than in-hospital mortality in the nonelderly in 1999-2005.

Research paper thumbnail of P-91 Outcome of laparoscopic adjustable gastric banding and the prevalence of band revision and explantation at academic centers

Surgery for Obesity and Related Diseases, 2011

ABSTRACT

Research paper thumbnail of Characterization and electronic structure calculations of the antiferromagnetic insulatorCa3FeRhO6

Research paper thumbnail of Advances in Circular Stapling Technique for Gastric Bypass: Transoral Placement of the Anvil

Research paper thumbnail of Silicotantalates et siliconiobates non-stoechiometriques : Les composes K6−2xBaxTa6Si4O26 (0 ≤ x ≤ 3) et K8M14Si4O47 (M = Ta, Nb)

Materials Research Bulletin, 1977

Research paper thumbnail of De nouveaux oxydes a reseau forme d'octaedres NbO6 (TaO6) et de groupes Si2O7: Les phases A3Ta6Si4O26 (A = Ba, Sr) et K6M6Si4O26 (M = Nb, Ta)

Materials Research Bulletin, 1976

Research paper thumbnail of A paradigm shift in management of gastrointestinal leaks after minimally invasive esophagectomy

Journal of the American College of Surgeons, 2010

Research paper thumbnail of Non-stoechiométrie par “intercroissance” dans les siliconiobates de baryum. Les composés (Ba3Nb6Si4O26)n· Ba3Nb4Ti4O21

Journal of Solid State Chemistry, 1976

Research paper thumbnail of Oxygen defect K2NiF4-type oxides: The compounds

Journal of Solid State Chemistry, 1981

Oxygen defect K2NiF4-type oxides La2−xSrxCuO4−x2+δ have been synthesized for a wide composition r... more Oxygen defect K2NiF4-type oxides La2−xSrxCuO4−x2+δ have been synthesized for a wide composition range: 0 ≤ x ≤ 1.34. From the X-ray and electron diffraction study three domains have been characterized: orthorhombic compounds with La2CuO4 structure for 0 ≤ x < 0.10, tetragonal oxides similar to LaSrCuO4 for 0.10 ≤ x < 1 and several superstructures derived from the tetragonal cell (a ⋍ n.aLaSrCuO4 with n = 3, 4, 4.5, 5, 6) for 1 ≤ x ≤ 1.34. The compounds corresponding to 0 < x < 1 differ from the other oxides in that they are characterized by the presence of copper with two oxidation states: + 2 and + 3. A model structure for La0.8Sr1.2CuλO3.4, in which copper has only the + 2 oxidation state, and for which the actual cell is tegragonal—a = 18.804 A and c = 12.94 A—has been established. The particular structural evolution of these compounds is discussed in terms of a competition between the capability of Cu(II) to be oxidized to Cu(III) and the ordering of oxygen vacancies.

Research paper thumbnail of Application de la spectrometrie vibrationnelle à un probleme de non-stoechiométrie par insertion dans les tunnels pentagonaux des réseaux (M6X4O26) (M = Nb, Ta; X = Si, Ge)

Journal of Solid State Chemistry, 1978

Research paper thumbnail of The oxygen defect perovskite Sr2Mn2O5: HREM study

Journal of Solid State Chemistry, 1986

ABSTRACT

Research paper thumbnail of Body Mass Index is Predictive of Higher In-hospital Mortality in Patients Undergoing Laparoscopic Gastric Bypass but Not Laparoscopic Sleeve Gastrectomy or Gastric Banding

The American Surgeon

High body mass index (BMI) has been shown to be a factor predictive of increased morbidity and mo... more High body mass index (BMI) has been shown to be a factor predictive of increased morbidity and mortality in several single-institution studies. Using the University HealthSystem Consortium clinical database, we examined the impact of BMI on in-hospital mortality for patients who underwent laparoscopic gastric bypass, sleeve gastrectomy, and gastric banding between October 2011 and February 2014. Outcomes were examined within each procedure according to BMI groups of 35 to 49.9, 50.0 to 59.9, and 60.0 kg/m2 or greater. Outcome measures included in-hospital mortality, major complications, length of hospital stay, 30-day readmission, and cost. A total of 40,102 bariatric procedures were performed during this time period. For gastric bypass, there was an increase of in-hospital mortality (0.01 and 0.02 vs 0.34%; P < 0.01) and major complications (0.93 and 0.99 vs 2.62%; P < 0.01) in the BMI 60 kg/m2 or greater group. In contrast, sleeve gastrectomy and gastric banding had no assoc...

Research paper thumbnail of Consumer acceptance of irradiated food and information disclosure – A retail imperative

Journal of Retailing and Consumer Services, 2021

Abstract There is substantial contribution in the literature for understanding the complex nature... more Abstract There is substantial contribution in the literature for understanding the complex nature of irradiated foods, the growing importance and the controversial views expended by consumers, yet acceptance of these foods for many have not met with optimal recognition. The study extends the theory of planned behaviour antecedents to analyse independent determinants and the influences of risk and trust. The indirect effects are also examined. The study uses multigroup analyses to identify whether consumer's concerns on information for irradiated foods act as moderators in order to provide a better explanatory power. The data was analysed using Structural Equation Modelling on responses obtained from a sample of 322 consumers. The study found that the theory of planned behaviour antecedents successfully predicted behavioural intention for irradiated foods but with some limitations. The findings also demonstrate additional support to show that the robustness of the TPB framework is effective for irradiated foods and addresses the literature calls on research for more theoretical underpinnings. It further addresses retailer implications, as the ultimate decision falls with retailers who assess whether sales for irradiated foods are acceptable depending on consumer demand.

Research paper thumbnail of Minimally Invasive Resection of Benign Gastric Tumors in Challenging Locations: Prepyloric Region or Gastroesophageal Junction

The American Surgeon, 2013

Benign gastric tumors in a prepyloric location or within 3 cm adjacent of the gastroesophageal ju... more Benign gastric tumors in a prepyloric location or within 3 cm adjacent of the gastroesophageal junction (GEJ) are often challenging to resect using minimally invasive surgical techniques. The aim of this study was to examine the outcomes of patients who underwent minimally invasive enucleation or resection of benign gastric tumors at these difficult locations. The charts of patients undergoing minimally invasive resection of benign-appearing submucosal gastric tumors between June 2001 and December 2012 were reviewed. Data on tumor size and location, type of minimally invasive surgical resection, perioperative complications, 90-day mortality, pathology, and recurrence were collected. A total of 70 consecutive patients underwent laparoscopic resection of benign-appearing submucosal gastric tumors; there were 24 patients with lesions close to the GEJ and nine patients with lesions close to the prepyloric region. All lesions were successfully resected laparoscopically. For prepyloric tu...

Research paper thumbnail of What is a Good Journal? Perceptions of Vietnamese Early-Career and Mid-Career Researchers

Publishing Research Quarterly, 2020

Research paper thumbnail of TEMPORARY REMOVAL: Lipids and Bariatric Procedures Part 1 of 2: Scientific Statement from the National Lipid Association (NLA), American Society for Metabolic and Bariatric Surgery (ASMBS), and Obesity Medicine Association (OMA)

Journal of Clinical Lipidology, 2015

Research paper thumbnail of Laparoscopic gastric ischemic conditioning prior to esophagogastrectomy: technique and review

Surgical innovation, 2008

Esophagectomy can be associated with significant peri-operative morbidity such as leaks and stric... more Esophagectomy can be associated with significant peri-operative morbidity such as leaks and strictures. Gastric ischemia as a result of gastric devascularization is one of the several contributing factors that may play a role in development of these complications. In an attempt to improve gastric tissue perfusion, a technique of gastric ischemic conditioning was proposed. For patients with esophageal cancer and at the time of laparoscopic staging, partial gastric devascularization is achieved by division of the left gastric vessels. Esophagectomy is subsequently performed several days after the gastric ischemic conditioning procedure. Our experience showed that preoperative ligation of left gastric vessels prior to esophagogastrectomy is technically feasible and safe and may decrease ischemic complications such as leaks and strictures.

Research paper thumbnail of A single-port technique for laparoscopic extended stapled appendectomy

Surgical innovation, 2009

Natural orifice translumenal endoscopic surgery (NOTES) has become an exciting area of surgical d... more Natural orifice translumenal endoscopic surgery (NOTES) has become an exciting area of surgical development. Significant limitations to this surgical concept include lack of surgical expertise and appropriate flexible instrumentation. An alternative and competing technology to NOTES is single-incision laparoscopic surgery. This study describes a patient in whom a laparoscopic surgical technique for appendectomy used incisions that were all placed within the umbilicus. The operative time was 40 minutes. There were no intraoperative complications. The patient did well postoperatively and was discharged on postoperative day 1. There were no perioperative complications at 1-month follow-up. Appendectomy performed through laparoscopic incisions placed within the umbilicus was technically feasible and safe. Development of advanced flexible instrumentation and visualization platform may facilitate this new operative approach.

Research paper thumbnail of Preoperative dehydration increases risk of postoperative acute renal failure in colon and rectal surgery

Journal of gastrointestinal surgery : official journal of the Society for Surgery of the Alimentary Tract, 2014

There is limited data regarding the effects of preoperative dehydration on postoperative renal fu... more There is limited data regarding the effects of preoperative dehydration on postoperative renal function. We sought to identify associations between hydration status before operation and postoperative acute renal failure (ARF) in patients undergoing colorectal resection. The NSQIP database was used to examine the data of patients undergoing colorectal resection from 2005 to 2011. We used preoperative blood urea nitrogen (BUN)/creatinine ratio >20 as a marker of relative dehydration. Multivariate analysis using logistic regression was performed to quantify the association of BUN/Cr ratio with ARF. We sampled 27,860 patients who underwent colorectal resection. Patients with dehydration had higher risk of ARF compared to patients with BUN/Cr <10 (AOR, 1.23; P = 0.04). Dehydration was associated with an increase in mortality of the affected patients (AOR, 2.19; P < 0.01). Postoperative complication of myocardial infarction (MI) (AOR, 1.46; P < 0.01) and cardiac arrest (AOR, 1...

Research paper thumbnail of Does Hospital Accreditation Impact Bariatric Surgery Safety?

Research paper thumbnail of Bariatric surgery in the elderly: 2009–2013

Surgery for Obesity and Related Diseases, 2015

Ample evidence supports the safety and effectiveness of bariatric surgery in the general adult po... more Ample evidence supports the safety and effectiveness of bariatric surgery in the general adult population but more information is needed in patients age 60 years and older (elderly). We previously examined the outcome of bariatric surgery performed in the elderly between 1999 and 2005 using the University HealthSystem Consortium (UHC) Clinical Database. The aim of this study was to analyze contemporary outcomes of bariatric surgery in the elderly and to compare them to previous data from 1999-2005. Using International Classification of Diseases, 9(th) Revision diagnosis and procedure codes, we obtained data from the UHC database for all elderly (age &amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;gt;60 yr) and adult nonelderly (age 19-60 yr) patients who underwent bariatric surgery for the treatment of morbid obesity between 2009 and 2013. Outcome measures, such as patient characteristics, LOS, morbidity, and observed-to-expected (risk-adjusted) mortality ratio were compared between elderly and nonelderly patients. Bariatric surgery in the elderly made up 2.7% of all bariatric operations in 1999-2005. This represents an increase to 10.1% of all bariatric operations in 2009-2013. In-hospital mortality was .30% for the nonelderly and .70% for the elderly in 1999-2005, whereas contemporary in-hospital mortality has decreased to .11% for the nonelderly and .05% for the elderly. Our results show that the number of bariatric procedures performed in the elderly is increasing and now represents 10% of all bariatric operations performed at academic centers. In-hospital mortality in bariatric surgery in the elderly has improved so much that it is now even better than in-hospital mortality in the nonelderly in 1999-2005.

Research paper thumbnail of P-91 Outcome of laparoscopic adjustable gastric banding and the prevalence of band revision and explantation at academic centers

Surgery for Obesity and Related Diseases, 2011

ABSTRACT

Research paper thumbnail of Characterization and electronic structure calculations of the antiferromagnetic insulatorCa3FeRhO6

Research paper thumbnail of Advances in Circular Stapling Technique for Gastric Bypass: Transoral Placement of the Anvil

Research paper thumbnail of Silicotantalates et siliconiobates non-stoechiometriques : Les composes K6−2xBaxTa6Si4O26 (0 ≤ x ≤ 3) et K8M14Si4O47 (M = Ta, Nb)

Materials Research Bulletin, 1977

Research paper thumbnail of De nouveaux oxydes a reseau forme d'octaedres NbO6 (TaO6) et de groupes Si2O7: Les phases A3Ta6Si4O26 (A = Ba, Sr) et K6M6Si4O26 (M = Nb, Ta)

Materials Research Bulletin, 1976

Research paper thumbnail of A paradigm shift in management of gastrointestinal leaks after minimally invasive esophagectomy

Journal of the American College of Surgeons, 2010

Research paper thumbnail of Non-stoechiométrie par “intercroissance” dans les siliconiobates de baryum. Les composés (Ba3Nb6Si4O26)n· Ba3Nb4Ti4O21

Journal of Solid State Chemistry, 1976

Research paper thumbnail of Oxygen defect K2NiF4-type oxides: The compounds

Journal of Solid State Chemistry, 1981

Oxygen defect K2NiF4-type oxides La2−xSrxCuO4−x2+δ have been synthesized for a wide composition r... more Oxygen defect K2NiF4-type oxides La2−xSrxCuO4−x2+δ have been synthesized for a wide composition range: 0 ≤ x ≤ 1.34. From the X-ray and electron diffraction study three domains have been characterized: orthorhombic compounds with La2CuO4 structure for 0 ≤ x < 0.10, tetragonal oxides similar to LaSrCuO4 for 0.10 ≤ x < 1 and several superstructures derived from the tetragonal cell (a ⋍ n.aLaSrCuO4 with n = 3, 4, 4.5, 5, 6) for 1 ≤ x ≤ 1.34. The compounds corresponding to 0 < x < 1 differ from the other oxides in that they are characterized by the presence of copper with two oxidation states: + 2 and + 3. A model structure for La0.8Sr1.2CuλO3.4, in which copper has only the + 2 oxidation state, and for which the actual cell is tegragonal—a = 18.804 A and c = 12.94 A—has been established. The particular structural evolution of these compounds is discussed in terms of a competition between the capability of Cu(II) to be oxidized to Cu(III) and the ordering of oxygen vacancies.

Research paper thumbnail of Application de la spectrometrie vibrationnelle à un probleme de non-stoechiométrie par insertion dans les tunnels pentagonaux des réseaux (M6X4O26) (M = Nb, Ta; X = Si, Ge)

Journal of Solid State Chemistry, 1978

Research paper thumbnail of The oxygen defect perovskite Sr2Mn2O5: HREM study

Journal of Solid State Chemistry, 1986

ABSTRACT