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Kim D, Na H, Ahn J, Lee J, Jung K, Choi K, Song H, Lee G, Jung H. Comparison of efficacy and safety between redo-endoscopic treatment and surgery for recurrent gastric neoplasms at the scar of prior endoscopic submucosal dissection. Ann Oncol 2018. [DOI: 10.1093/annonc/mdy151.059] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
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Canesso MCC, Lemos L, Neves TC, Marim FM, Castro TBR, Veloso ÉS, Queiroz CP, Ahn J, Santiago HC, Martins FS, Alves-Silva J, Ferreira E, Cara DC, Vieira AT, Barber GN, Oliveira SC, Faria AMC. The cytosolic sensor STING is required for intestinal homeostasis and control of inflammation. Mucosal Immunol 2018; 11:820-834. [PMID: 29346345 DOI: 10.1038/mi.2017.88] [Citation(s) in RCA: 78] [Impact Index Per Article: 13.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/28/2016] [Accepted: 09/17/2017] [Indexed: 02/06/2023]
Abstract
STING (stimulator of interferon genes) is a cytosolic sensor for cyclic dinucleotides and also an adaptor molecule for intracellular DNA receptors. Although STING has important functions in the host defense against pathogens and in autoimmune diseases, its physiological relevance in intestinal homeostasis is largely unknown. In this study, we show that STING-/- mice presented defective protective mechanisms of intestinal mucosa, including decreased number of goblet cells, diminished mucus production, and lower levels of secretory IgA, when compared with wild-type (WT) mice. Fecal content and microbiota DNA could activate STING, indicating a role of this molecule in gut. Microbiota composition was altered in STING-/- mice toward a more inflammatory profile, evidencing a reduction in the Allobacolum and Bifidobacterium groups along with increase in Disulfovibrio bacteria. Absence of STING lead to decrease in induced intraepithelial lymphocytes (IEL) and to increase in group 1 innate lymphoid cell (ILC1) as well as ILC3 frequencies and decrease in ILC2 in the colon. Development and function of Foxp3+ and LAP+ regulatory T cells were also compromised in STING-/- mice. Moreover, these mice were highly susceptible to dextran sodium sulfate-induced colitis, T-cell-induced colitis, and enteric Salmonella typhimurium infection when compared with WT animals. Therefore, our results identify an important role of STING in maintaining gut homeostasis and also a protective effect in controlling gut inflammation.
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Mays D, Ahn J, Zhang B, Atkins MB, Goerlitz D, Tercyak KP. Genetic Associations with Indoor Tanning Addiction. Cancer Epidemiol Biomarkers Prev 2018. [DOI: 10.1158/1055-9965.epi-18-0061] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
Abstract
Abstract
Some young people are prone to develop addiction to indoor tanning along with psychiatric comorbidity. This study examined genetic hypotheses that liabilities in neurobiological addiction reward pathways influence risk of indoor tanning addiction and are affected by psychiatric comorbidity. Methods: Data were from an observational study investigating factors associated with indoor tanning addiction in a community sample of non-Hispanic white women ages 18–30 years with a history of indoor tanning in the past year. A total of 295 participants completed self-report measures and provided DNA samples. DNA samples were genotyped and analyzed for 36 single nucleotide polymorphisms (SNPs) in candidate genes involved in hypothesized addiction reward pathways (e.g., opioid and dopamine receptor genes). Self-report measures included indoor tanning frequency and dependence symptoms, appearance beliefs, and depressive symptoms. Results: Over 20% of the sample screened positive for indoor tanning addiction. Two SNPs in the DRD2 dopamine receptor gene, rs4436578 and rs4648318, were significantly associated (P < 0.05) with indoor tanning addiction after multiple testing adjustment using the false discovery rate. In logistic regression analyses adjusting for indoor tanning frequency, appearance beliefs, and depressive symptoms, homozygous major allele genotypes for both SNPs were associated with indoor tanning addiction (Odds Ratio [OR] 2.29, 95% Confidence Interval [CI] 1.11–4.77, and OR 1.95, 95% CI, 1.02–3.72, respectively). The major allele genotypes for both SNPs also interacted with depressive symptoms to influence the risk of indoor tanning addiction: OR 7.03, 95% CI, 3.26–15.19, OR 4.35, 95% CI, 2.06–9.20, respectively. Conclusions: This study is among the first to demonstrate SNPs in the DRD2 dopamine receptor gene are associated with indoor tanning addiction. Our findings demonstrate young women with risk-conferring genotypes and exhibiting depressive symptoms are at especially high risk. These data can inform personalized interventions tailored to neurobiological and behavioral differences to prevent melanoma and nonmelanoma skin cancer.
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Erickson BJ, Ahn J, Chalmers PN, Ahmad CS, Bach BR, Verma NN, Romeo AA. Reasons for Retirement Following Ulnar Collateral Ligament Reconstruction Among Major League Baseball Pitchers. Orthop J Sports Med 2017; 5:2325967117745021. [PMID: 29318169 PMCID: PMC5753933 DOI: 10.1177/2325967117745021] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/11/2022] Open
Abstract
Background: Ulnar collateral ligament reconstruction (UCLR) has become an increasingly common procedure among Major League Baseball (MLB) pitchers. The long-term effects of this procedure on the career of an MLB pitcher are largely unknown. Purpose/Hypothesis: The purpose of this study was to determine why and when MLB pitchers who underwent UCLR during their careers retired from baseball as compared with controls. We hypothesized that pitchers who underwent UCLR are no more likely than control pitchers to retire from elbow or shoulder problems. Study Design: Cross-sectional study; Level of evidence, 3. Methods: All MLB pitchers who underwent UCLR were identified through publicly available data. A cohort of pitchers who did not undergo UCLR were matched to pitchers with a history of UCLR, based on sex, age, draft year, and draft round. Of those who were no longer pitching in the MLB, the reason for retirement was determined. Reason for retirement and length of career following UCLR (surgical group) and index year (control group) were determined and compared through prior studies via the MLB HITS database, MLB team websites, and publicly available internet-based injury reports. Results: Overall, 153 MLB pitchers who underwent UCLR between 1974 and 2015 are currently retired. Mean ± SD time to retirement was 4.4 ± 4.7 years (range, 0-26 years) after the index year in the control group and 4.4 ± 3.5 years (range, 0-15 years) after surgery in the UCLR group (P = .388). Patients who were status post-UCLR were significantly more likely to be released during the season (34 of 144, 23.6%) than were players who were not status post-UCLR (14 of 144, 9.7%) (P = .002). Shoulder injury as a reason for retirement was more common in the control group than the UCLR group (P = .011). Elbow injury as a reason for retirement was not more common in either group (P = .379). Leg injury as a reason for retirement was more common in the control group (P = .013). Performance as a reason for retirement was more common in the UCLR group than the control group (P < .001). Conclusion: MLB pitchers who have undergone UCLR are no more likely to retire from shoulder or elbow injuries than are those who have not undergone UCLR. MLB career length was similar between pitchers with and without a history of UCLR.
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Basques BA, McLynn RP, Fice MP, Samuel AM, Lukasiewicz AM, Bohl DD, Ahn J, Singh K, Grauer JN. Results of Database Studies in Spine Surgery Can Be Influenced by Missing Data. Clin Orthop Relat Res 2017; 475:2893-2904. [PMID: 27896677 PMCID: PMC5670041 DOI: 10.1007/s11999-016-5175-7] [Citation(s) in RCA: 53] [Impact Index Per Article: 7.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
Abstract
BACKGROUND National databases are increasingly being used for research in spine surgery; however, one limitation of such databases that has received sparse mention is the frequency of missing data. Studies using these databases often do not emphasize the percentage of missing data for each variable used and do not specify how patients with missing data are incorporated into analyses. This study uses the American College of Surgeons National Surgical Quality Improvement Program (ACS-NSQIP) database to examine whether different treatments of missing data can influence the results of spine studies. QUESTIONS/PURPOSES (1) What is the frequency of missing data fields for demographics, medical comorbidities, preoperative laboratory values, operating room times, and length of stay recorded in ACS-NSQIP? (2) Using three common approaches to handling missing data, how frequently do those approaches agree in terms of finding particular variables to be associated with adverse events? (3) Do different approaches to handling missing data influence the outcomes and effect sizes of an analysis testing for an association with these variables with occurrence of adverse events? METHODS Patients who underwent spine surgery between 2005 and 2013 were identified from the ACS-NSQIP database. A total of 88,471 patients undergoing spine surgery were identified. The most common procedures were anterior cervical discectomy and fusion, lumbar decompression, and lumbar fusion. Demographics, comorbidities, and perioperative laboratory values were tabulated for each patient, and the percent of missing data was noted for each variable. These variables were tested for an association with "any adverse event" using three separate multivariate regressions that used the most common treatments for missing data. In the first regression, patients with any missing data were excluded. In the second regression, missing data were treated as a negative or "reference" value; for continuous variables, the mean of each variable's reference range was computed and imputed. In the third regression, any variables with > 10% rate of missing data were removed from the regression; among variables with ≤ 10% missing data, individual cases with missing values were excluded. The results of these regressions were compared to determine how the different treatments of missing data could affect the results of spine studies using the ACS-NSQIP database. RESULTS Of the 88,471 patients, as many as 4441 (5%) had missing elements among demographic data, 69,184 (72%) among comorbidities, 70,892 (80%) among preoperative laboratory values, and 56,551 (64%) among operating room times. Considering the three different treatments of missing data, we found different risk factors for adverse events. Of 44 risk factors found to be associated with adverse events in any analysis, only 15 (34%) of these risk factors were common among the three regressions. The second treatment of missing data (assuming "normal" value) found the most risk factors (40) to be associated with any adverse event, whereas the first treatment (deleting patients with missing data) found the fewest associations at 20. Among the risk factors associated with any adverse event, the 10 with the greatest effect size (odds ratio) by each regression were ranked. Of the 15 variables in the top 10 for any regression, six of these were common among all three lists. CONCLUSIONS Differing treatments of missing data can influence the results of spine studies using the ACS-NSQIP. The current study highlights the importance of considering how such missing data are handled. CLINICAL RELEVANCE Until there are better guidelines on the best approaches to handle missing data, investigators should report how missing data were handled to increase the quality and transparency of orthopaedic database research. Readers of large database studies should note whether handling of missing data was addressed and consider potential bias with high rates or unspecified or weak methods for handling missing data.
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Uddin MJ, Ahn J. Associations between resistance phenotype and gene expression in response to serial exposure to oxacillin and ciprofloxacin in Staphylococcus aureus. Lett Appl Microbiol 2017; 65:462-468. [PMID: 28977678 DOI: 10.1111/lam.12808] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/22/2017] [Revised: 09/28/2017] [Accepted: 09/28/2017] [Indexed: 12/17/2022]
Abstract
This study was designed to delineate the relationship between resistance phenotypes and gene expression in wild-type (SAWT ), oxacillin-induced (SAOXA ), ciprofloxacin-induced (SACIP ) and clinically acquired antibiotic-resistant Staphylococcus aureus (SACA ) exposed to oxacillin (β-lactam) and ciprofloxacin (fluoroquinolone). The phenotypic response and gene expression were varied with the antibiotic exposure. SAWT was highly resistant to oxacillin (MIC = 8 μg ml-1 ) after serial exposure to oxacillin, while the oxacillin susceptibility was not changed in SAWT when exposed to ciprofloxacin (MIC = 0·25 μg ml-1 ). The clinical isolate, SACA , was highly resistant to all classes of antibiotics used in this study. The increased resistance of SAOXA and SACIP to penicillinase-labile penicillins was attributed to the production of β-lactamase, which is in good agreement with the overexpression of blaZ (>2-fold). The overexpression of efflux pump-related genes (norA, norB, norC, mdeA, mepR, mgrA and lmrS) was associated with the increased resistance of SACIP and SACA to aminoglycosides and quinolones. This study confirmed that the linkage between resistance phenotypes and molecular genotypes highly varied depending on intrinsic resistance profile, response to antibiotic exposure and genes conferring resistance. This study provides useful information for understanding the mechanisms of methicillin resistance in S. aureus in association with phenotypic and genotypic resistance determinants. SIGNIFICANCE AND IMPACT OF THE STUDY The improvement in current standards is essential to accurately detect methicillin-resistant Staphylococcus aureus in consideration of various resistance phenotypes and genotypes. The varied and distinctive expression patterns of antibiotic resistance-related genes were observed in S. aureus exposed to oxacillin and ciprofloxacin. It is worth noting the relationship between resistance phenotype and resistance genotype in terms of MIC values and expression of antibiotic resistance determinants. This study provides useful information for understanding the mechanisms of methicillin resistance in S. aureus in association with phenotypic and genotypic resistance determinants.
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Ahn J, Chang T, Wang X, Limpouchová Z, Procházka K. Influence of the Chain Architecture and the Presence of End-Groups or Branching Units Chemically Different from Repeating Structural Units on the Critical Adsorption Point in Liquid Chromatography. Macromolecules 2017. [DOI: 10.1021/acs.macromol.7b01786] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
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Jung JH, Kumar Mohanty A, Ye J, Lee T, Ahn J, Lim YG, Chang T, Paik HJ. Covalent fixed multicyclic polystyrene conformers. ACTA ACUST UNITED AC 2017. [DOI: 10.1002/pola.28869] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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Hijji FY, Narain AS, Bohl DD, Ahn J, Long WW, DiBattista JV, Kudaravalli KT, Singh K. Lateral lumbar interbody fusion: a systematic review of complication rates. Spine J 2017; 17:1412-1419. [PMID: 28456671 DOI: 10.1016/j.spinee.2017.04.022] [Citation(s) in RCA: 76] [Impact Index Per Article: 10.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/28/2016] [Revised: 02/24/2017] [Accepted: 04/21/2017] [Indexed: 02/03/2023]
Abstract
BACKGROUND CONTEXT Lateral lumbar interbody fusion (LLIF) is a frequently used technique for the treatment of lumbar pathology. Despite its overall success, LLIF has been associated with a unique set of complications. However, there has been inconsistent evidence regarding the complication rate of this approach. PURPOSE To perform a systematic review analyzing the rates of medical and surgical complications associated with LLIF. STUDY DESIGN Systematic review. PATIENT SAMPLE 6,819 patients who underwent LLIF reported in clinical studies through June 2016. OUTCOME MEASURES Frequency of complications within cardiac, vascular, pulmonary, urologic, gastrointestinal, transient neurologic, persistent neurologic, and spine (MSK) categories. METHODS This systematic review was performed using the Preferred Reporting Items for Systematic Reviews and Meta-Analyses (PRISMA) guidelines. Relevant studies that identified rates of any complication following LLIF procedures were obtained from PubMed, MEDLINE, and EMBASE databases. Articles were excluded if they did not report complications, presented mixed complication data from other procedures, or were characterized as single case reports, reviews, or case series containing less than 10 patients. The primary outcome was frequency of complications within cardiac, vascular, pulmonary, urologic, gastrointestinal, transient neurologic, persistent neurologic, and MSK categories. All rates of complications were based on the sample sizes of studies that mentioned the respective complications. The authors report no conflicts of interest directly or indirectly related to this work, and have not received any funds in support of this work. RESULTS A total of 2,232 articles were identified. Following screening of title, abstract, and full-text availability, 63 articles were included in the review. A total of 6,819 patients had 11,325 levels fused. The rate of complications for the categories included were as follows: wound (1.38%; 95% confidence interval [CI]=1.00%-1.85%), cardiac (1.86%; CI=1.33%-2.52%), vascular (0.81%; CI=0.44%-1.36%), pulmonary (1.47; CI=0.95%-2.16%), gastrointestinal (1.38%; CI=1.00%-1.87%), urologic (0.93%; CI=0.55%-1.47%), transient neurologic (36.07%; CI=34.74%-37.41%), persistent neurologic (3.98%; CI=3.42%-4.60%), and MSK or spine (9.22%; CI=8.28%-10.23%). CONCLUSIONS The current study is the first to comprehensively analyze the complication profile for LLIFs. The most significant reported complications were transient neurologic in nature. However, persistent neurologic complications occurred at a much lower rate, bringing into question the significance of transient symptoms beyond the immediate postoperative period. Through this analysis of complication profiles, surgeons can better understand the risks to and expectations for patients following LLIF procedures.
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Ahn J, Byun J, Rha S. P4662Comparison of dual drug-eluting (CILOTAXTM) and everolimus-eluting stents in patients with ST-elevation myocardial infarction (STEMI); 3-years clinical outcomes. Eur Heart J 2017. [DOI: 10.1093/eurheartj/ehx504.p4662] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
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Choe J, Cha K, Lee S, Kim D, Ahn J, Park J, Lee H, Oh J, Choi J, Lee H, Hong T, Jeong M. P4260Comparison of Prescription and Bleeding Rates and Clinical Outcomes of Contemporary P2Y12 Inhibitors in Patients with Acute Coronary Syndrome Undergoing Percutaneous Coronary Intervention. Eur Heart J 2017. [DOI: 10.1093/eurheartj/ehx504.p4260] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
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Rathod ML, Ahn J, Jeon NL, Lee J. Hybrid polymer microfluidic platform to mimic varying vascular compliance and topology. LAB ON A CHIP 2017; 17:2508-2516. [PMID: 28653725 DOI: 10.1039/c7lc00340d] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
Several cardiovascular pathologies and aging have been associated with alterations in the mechanical and structural properties of the vascular wall, leading to a reduction in arterial compliance and the development of constriction. In the past, rare efforts have been directed to understand the endothelial cell response to combined mechanical stimuli from fluid flow and substrate rigidity. Recent approaches using microfluidic platforms have limitations in precisely mimicking healthy and diseased vasculature conditions from altered topological and substrate compliance perspectives. To address this, we demonstrated an effective fabrication process to realize a hybrid polymer platform to test these mechanistic features of blood vessels. The salient features of the platform include circular microchannels of varying diameters, variation in substrate rigidity along the channel length, and the coexistence of microchannels with different cross sections on a single platform. The platform demonstrates the combined effects of flow-induced shear forces and substrate rigidity on the endothelial cell layer inside the circular microchannels. The experimental results indicate a pronounced cell response to flow induced shear stress via its interplay with the underlying substrate mechanics.
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Ahn J, Cho MJ, Kim HJ, Kim YH. P826Rhythm versus rate control in patients with atrial fibrillation combined with left ventricular systolic dysfunction: a meta-analysis. Europace 2017. [DOI: 10.1093/ehjci/eux151.008] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
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Bohl DD, Hijji FY, Massel DH, Mayo BC, Long WW, Modi KD, Narain AS, Manning BT, Ahn J, Louie PK, Singh K. Patient knowledge regarding radiation exposure from spinal imaging. Spine J 2017; 17:305-312. [PMID: 27664337 DOI: 10.1016/j.spinee.2016.09.017] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/14/2016] [Accepted: 09/12/2016] [Indexed: 02/03/2023]
Abstract
BACKGROUND CONTEXT Spine surgeons employ a high volume of imaging in the diagnosis and evaluation of spinal pathology. However, little is known regarding patients' knowledge of the radiation exposure associated with these imaging techniques. PURPOSE To characterize spine patients' knowledge regarding radiation exposure from various imaging modalities. STUDY DESIGN/SETTING A cross-sectional survey study. PATIENT SAMPLE One hundred patients at their first clinic visit with a single spine surgeon at an urban institution. OUTCOME MEASURES The primary outcome was patient estimate of radiation dose for various common spinal imaging modalities as compared with true dose. METHODS An electronic survey was administered to all new patients before their first appointment with a single spinal surgeon. The survey asked patients to estimate how many chest x-rays (CXRs) worth of radiation were equivalent to various common spinal imaging modalities. Patient estimates were compared to true effective radiation doses determined from the literature. The survey also asked patients whether they would consider avoiding types of imaging modalities out of concern for excessive radiation exposure. RESULTS Patients accurately approximated the radiation associated with two views of the cervical spine, with a median estimate of 3.5 CXRs, compared with an actual value of 4.7 CXRs. However, patients underestimated the dose for computed tomography (CT) scans of the cervical spine (2.0 CXRs vs. 145.3 CXRs), two views of the lumbar spine (3.0 CXRs vs. 123.3 CXRs), and CT scans of the lumbar spine (2.0 CXRs vs. 638.3 CXRs). The majority of patients believed that there is at least some radiation exposure associated with magnetic resonance imaging (MRI). The percent of patients who would consider forgoing imaging recommend by their surgeon out of concern for radiation exposure was 14% for x-rays, 13% for CT scans, and 9% for MRI. CONCLUSION These results demonstrate a lack of patient understanding regarding radiation exposure associated with common spinal imaging techniques. These data suggest that patients might benefit from increased counseling and/or educational materials regarding radiation exposure before undergoing diagnostic imaging of the cervical or lumbar spine.
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Bohl DD, Ahn J, Lukasiewicz AM, Samuel AM, Webb ML, Basques BA, Golinvaux NS, Singh K, Grauer JN. Severity Weighting of Postoperative Adverse Events in Orthopedic Surgery. AMERICAN JOURNAL OF ORTHOPEDICS (BELLE MEAD, N.J.) 2017; 46:E235-E243. [PMID: 28856354] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
Studies of adverse events (AEs) after orthopedic surgery commonly use composite AE outcomes. An example of such an outcome is any AE. These types of outcomes treat AEs with different clinical significance (eg, death, urinary tract infection) similarly. We conducted a study to address this shortcoming in research methodology by creating a single severity-weighted outcome that can be used to characterize the overall severity of a given patient's postoperative course. All orthopedic faculty members at 2 academic institutions were invited to complete a severity-weighting exercise in which AEs were assigned a percentage severity of death. Mean (standard error) severity weight for urinary tract infection was 0.23% (0.08%); blood transfusion, 0.28% (0.09%); pneumonia, 0.55% (0.15%); hospital readmission, 0.59% (0.23%); wound dehiscence, 0.64% (0.17%); deep vein thrombosis, 0.64% (0.19%); superficial surgical-site infection, 0.68% (0.23%); return to operating room, 0.91% (0.29%); progressive renal insufficiency, 0.93% (0.27%); graft/prosthesis/flap failure, 1.20% (0.34%); unplanned intubation, 1.38% (0.53%); deep surgical-site infection, 1.45% (0.38%); failure to wean from ventilator, 1.45% (0.48%); organ/space surgical-site infection, 1.76% (0.46%); sepsis without shock, 1.77% (0.42%); peripheral nerve injury, 1.83% (0.47%); pulmonary embolism, 2.99% (0.76%); acute renal failure, 3.95% (0.85%); myocardial infarction, 4.16% (0.98%); septic shock, 7.17% (1.36%); stroke, 8.73% (1.74%); cardiac arrest requiring cardiopulmonary resuscitation, 9.97% (2.46%); and coma, 15.14% (3.04%). Future studies may benefit from using this new severity-weighted outcome score.
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Ziebarth JD, Gardiner AA, Wang Y, Jeong Y, Ahn J, Jin Y, Chang T. Comparison of Critical Adsorption Points of Ring Polymers with Linear Polymers. Macromolecules 2016. [DOI: 10.1021/acs.macromol.6b01925] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
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Ahn J, Yun IS, Yoo HG, Choi JJ, Lee M. Developing new automated alternation flicker using optic disc photography for the detection of glaucoma progression. Eye (Lond) 2016; 31:119-126. [PMID: 27662466 DOI: 10.1038/eye.2016.204] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/10/2016] [Accepted: 08/17/2016] [Indexed: 11/09/2022] Open
Abstract
PurposeTo evaluate a progression-detecting algorithm for a new automated matched alternation flicker (AMAF) in glaucoma patients.MethodsOpen-angle glaucoma patients with a baseline mean deviation of visual field (VF) test>-6 dB were included in this longitudinal and retrospective study. Functional progression was detected by two VF progression criteria and structural progression by both AMAF and conventional comparison methods using optic disc and retinal nerve fiber layer (RNFL) photography. Progression-detecting performances of AMAF and the conventional method were evaluated by an agreement between functional and structural progression criteria. RNFL thickness changes measured by optical coherence tomography (OCT) were compared between progressing and stable eyes determined by each method.ResultsAmong 103 eyes, 47 (45.6%), 21 (20.4%), and 32 (31.1%) eyes were evaluated as glaucoma progression using AMAF, the conventional method, and guided progression analysis (GPA) of the VF test, respectively. The AMAF showed better agreement than the conventional method, using GPA of the VF test (κ=0.337; P<0.001 and κ=0.124; P=0.191, respectively). The rates of RNFL thickness decay using OCT were significantly different between the progressing and stable eyes when progression was determined by AMAF (-3.49±2.86 μm per year vs -1.83±3.22 μm per year; P=0.007) but not by the conventional method (-3.24±2.42 μm per year vs -2.42±3.33 μm per year; P=0.290).ConclusionsThe AMAF was better than the conventional comparison method in discriminating structural changes during glaucoma progression, and showed a moderate agreement with functional progression criteria.
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Ahn J, Kim K, Proctor RW. Comparison of Mobile Web Browsers for Smartphones. JOURNAL OF COMPUTER INFORMATION SYSTEMS 2016. [DOI: 10.1080/08874417.2016.1180652] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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Kim H, Park S, Yoon J, Pak K, Ahn J, Cha J, Lee J, Shin S, Kim Y, Lee S, Cha H, Kim J. Preconception thyroid stimulating hormone level does not affect the pregnancy outcome in women undergoing in vitro fertilization. Fertil Steril 2016. [DOI: 10.1016/j.fertnstert.2016.07.526] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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Ahn J, Cummins S, Flouri E. OP62 Physical activity, sedentary behaviour and mental health in children: findings from the UK Millennium Cohort Study. Br J Soc Med 2016. [DOI: 10.1136/jech-2016-208064.62] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
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Ahn J, Iqbal A, Manning BT, Leblang S, Bohl DD, Mayo BC, Massel DH, Singh K. Minimally invasive lumbar decompression-the surgical learning curve. Spine J 2016; 16:909-16. [PMID: 26235463 DOI: 10.1016/j.spinee.2015.07.455] [Citation(s) in RCA: 51] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/05/2014] [Revised: 05/18/2015] [Accepted: 07/23/2015] [Indexed: 02/03/2023]
Abstract
BACKGROUND CONTEXT Minimally invasive spine surgery (MIS) procedures carry an inherently difficult learning curve based upon anecdotal evidence. Few studies have investigated the surgeon's learning curve for MIS lumbar laminectomy or laminotomy with or without discectomy. PURPOSE To characterize the learning curve of a 1- or 2-level MIS lumbar decompression (LD) based on perioperative and postoperative parameters . STUDY DESIGN/SETTING Retrospective analysis of a prospectively maintained registry was used for this study. PATIENT SAMPLE There were 228 consecutive patients who underwent a primary 1- or 2-level MIS LD by a single surgeon for degenerative spinal pathology from 2009 to 2014. From 2005 to 2006, 50 patients underwent 1- or 2-level open LD consecutively. OUTCOME MEASURES Perioperative and postoperative outcomes (complications, visual analogue scale [VAS] scores, reoperations) were the outcome measures for this study. METHODS Patients were stratified into first and second groups as determined by the case number at which the procedural time reached a plateau. Demographics, comorbidity, pain scores, and surgical outcomes were compared between the first 50 patients and the subsequent 178 patients. The secondary analysis compared the surgical outcomes between the initial 50 MIS and 50 open LD patients. No funds were received in support of this work. RESULTS The initial cohort was older with a higher comorbidity burden (p<.05). However, body mass index, gender, smoking status, and ethnicity did not differ between cohorts. The initial cohort incurred a greater procedural time (p<.001) and longer length of hospitalization (p<.05) than the second cohort. Estimated blood loss (EBL), pain scores, complication rates, recurrent herniation rates, and reoperation rates were similar between groups. In the secondary analysis, the open LD patients demonstrated greater procedural time, higher EBL, and longer length of hospital stay than the MIS patients. However, the reoperation rate and 30-day readmission rate were not different between the MIS and open patients. CONCLUSIONS Continued surgical experience was associated with a reduced operative time, shorter length of hospitalization, and similar blood loss following an MIS LD. Independent of surgical experience, all patients demonstrated similar improvements in clinical outcomes. These findings appear to suggest that although surgical experience may improve perioperative parameters (operative time, length of hospitalization), an MIS LD may initially be performed safely without prior experience.
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Lee JH, Lee YK, Oh SH, Ahn J, Lee YE, Pyo JH, Choi YY, Kim D, Bae SC, Sung YK, Kim DY. A systematic review of diagnostic accuracy of vertebral fracture assessment (VFA) in postmenopausal women and elderly men. Osteoporos Int 2016; 27:1691-9. [PMID: 26782682 DOI: 10.1007/s00198-015-3436-z] [Citation(s) in RCA: 36] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/05/2015] [Accepted: 11/17/2015] [Indexed: 10/22/2022]
Abstract
UNLABELLED This systematic review was performed to compare the diagnostic accuracy of vertebral fracture assessment (VFA) with that of spinal radiography for identification of vertebral fractures (VFs). VFA appeared to have moderate sensitivity and high specificity for detecting VFs when compared with spinal radiography. INTRODUCTION VFs are recognized as the hallmark of osteoporosis, and a previous VF increases the risk of a future fracture. Therefore, the timely detection of VFs is important for prevention of further fractures. This systematic review examined the diagnostic accuracy of VFA using dual X-ray absorptiometry (DXA) to identify VFs. METHODS We searched for potentially relevant studies using electronic databases, including Ovid-Medline, Ovid-EMBASE, Cochrane library, and four Korean databases, from their inception to May 2013. We compared the diagnostic accuracy of VFA with that of spinal radiography for detection of VFs by analyzing the sensitivity and specificity using a 2 × 2 contingency table. Subgroup analyses were also performed on studies with a low risk of bias and applicability. RESULTS Twelve studies were analyzed for the diagnostic accuracy of VFA. The sensitivity and specificity were 0.70-0.93 and 0.95-1.00, respectively, analyzed on a per-vertebra basis, and 0.65-1.00 and 0.74-1.00 on a per-patient basis. The sensitivity and specificity of five studies in subgroups with a low risk of bias in the intervention test were 0.70-0.84 and 0.96-0.99, respectively. In studies with a low risk of bias in the patient selection, those based on a per-vertebra basis in three studies were 0.70-0.93 and 0.96-1.00, respectively. CONCLUSIONS VFA had moderate sensitivity and high specificity for detecting VF when compared with spinal radiography. However, the present findings are insufficient to assess whether spinal radiography should be replaced by VFA.
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Ashraf S, Ahn J, Cha BH, Kim JS, Han I, Park H, Lee SH. RHEB: a potential regulator of chondrocyte phenotype for cartilage tissue regeneration. J Tissue Eng Regen Med 2016; 11:2503-2515. [PMID: 27061379 DOI: 10.1002/term.2148] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/03/2015] [Revised: 12/14/2015] [Accepted: 12/22/2015] [Indexed: 01/03/2023]
Abstract
As articular cartilage has a limited ability to self-repair, successful cartilage regeneration requires clinical-grade chondrocytes with innate characteristics. However, cartilage regeneration via chondrocyte transplantation is challenging, because chondrocytes lose their innate characteristics during in vitro expansion. Here, we investigated the mechanistic underpinning of the gene Ras homologue enriched in brain (RHEB) in the control of senescence and dedifferentiation through the modulation of oxidative stress in chondrocytes, a hallmark of osteoarthritis. Serial expansion of human chondrocytes led to senescence, dedifferentiation and oxidative stress. RHEB maintained the innate characteristics of chondrocytes by regulating senescence, dedifferentiation and oxidative stress, leading to the upregulation of COL2 expression via SOX9 and the downregulation of p27 expression via MCL1. RHEB also decreased the expression of COL10. RHEB knockdown mimics decreased the expression of SOX9, COL2 and MCL1, while abrogating the suppressive function of RHEB on p27 and COL10 in chondrocytes. RHEB-overexpressing chondrocytes successfully formed cartilage tissue in vitro as well as in vivo, with increased expression of GAG matrix and chondrogenic markers. RHEB induces a distinct gene expression signature that maintained the innate chondrogenic properties over a long period. Therefore, RHEB expression represents a potentially useful mechanism in terms of cartilage tissue regeneration from chondrocytes, by which chondrocyte phenotypic and molecular characteristics can be retained through the modulation of senescence, dedifferentiation and oxidative stress. Copyright © 2016 John Wiley & Sons, Ltd.
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Ahn J, Nguyen MH, Lim JK, Lee HM, Pan CQ, Lok AS. Letter: lessons from the 'real-world' entecavir therapy in chronic hepatitis B patients--authors' reply. Aliment Pharmacol Ther 2016; 43:847-8. [PMID: 26932418 DOI: 10.1111/apt.13558] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/08/2022]
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Seo S, Kim OY, Ahn J. Healthy Eating Exploratory Program for the Elderly: Low Salt Intake in Congregate Meal Service. J Nutr Health Aging 2016; 20:316-24. [PMID: 26892581 DOI: 10.1007/s12603-015-0622-9] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
Abstract
OBJECTIVES This study reported on an exploratory program to help the low income elderly improve healthy eating behavior, specifically by reducing salt intake. DESIGN We conducted an exploratory program for 4 weeks for this study. The exploratory program involved offering menus with reduced salt and providing education on healthy eating. After the exploratory program, a survey of the elderly and in-depth interviews allowed us to evaluate the program for foodservice providers (dietitian, social workers, and volunteer workers). This study included both foodservice workers and elderly who actually used the foodservice in a congregate meal service system. This is a unique approach. SETTING A congregate meal service center in Seoul, Korea. PARTICIPANTS Seventy four elderly in a congregate meal service center. MEASUREMENTS Demographics were collected, and the healthy eating program and healthy eating education for elderly respondents were evaluated. RESULTS The elderly showed high satisfaction with the exploratory program for healthy eating. We found no significant differences in satisfaction with the program between the elderly who attended education sessions and those who did not, but more of the elderly from the education sessions showed positive behavioral change intentions. CONCLUSION The exploratory program influenced to reduce the salt intake of the elderly in congregate meal service. This study suggests cooperation of foodservice providers and the support of administrators is critical to the success of such programs.
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