Propensity Score-adjusted Logistic Regression Research Articles

Critically ill patients with infective endocarditis, neurological complications and indication for cardiac surgery: a multicenter propensity-adjusted study

BackgroundThe benefit–risk balance and optimal timing of surgery for severe infective endocarditis (IE) with ischemic or hemorrhagic strokes is unknown. The study aim was to compare the neurological outcome between patients receiving surgery or not.MethodsIn a prospective register-based multicenter ICU study, patients were included if they met the following criteria: (i) left-sided IE with an indication for heart surgery; (ii) with cerebral complications documented by cerebral imaging before cardiac surgery; (iii) with Sequential Organ Failure Assessment score ≥ 3. Exclusion criteria were isolated right-sided IE, in-hospital acquired IE and patients with cerebral complications only after cardiac surgery. In the primary analysis, the prognostic value of surgery in term of disability at 6 month was assessed by using a propensity score-adjusted logistic regression.Results192 patients were included including ischemic stroke (74.5%) and hemorrhagic lesion (15.6%): 67 (35%) had medical treatment and 125 (65%) cardiac surgery. In the propensity score-adjusted logistic regression, a favorable 6-month neurological outcome was associated with surgery (odds ratio 13.8 (95% CI 6.2–33.7). The 1-year mortality was strongly reduced with surgery in the fixed-effect propensity-adjusted Cox model (hazard ratio 0.18; 95% CI 0.11–0.27; p < 0.001). These effects remained whether the patients received delayed surgery (n = 62/125) or not and whether they were deeply comatose (Glasgow Coma Scale ≤ 10) or not.ConclusionsIn critically ill IE patients with an indication for surgery and previous cerebral events, a better propensity-adjusted neurological outcome was associated with surgery compared with medical treatment.

Maternal Serum Folic Acid Levels and Onset of Kawasaki Disease in Offspring During Infancy

Kawasaki disease is an acute systemic vasculitis that primarily affects infants and young children. No reproducible risk factors have yet been identified, but a possible association between maternal folic acid supplementation and Kawasaki disease has been reported previously. To investigate the associations of exposure to maternal serum folic acid levels and maternal folic acid supplementation with onset of Kawasaki disease during infancy among offspring. This cohort study used data from the Japan Environment and Children's Study, a nationwide birth cohort, which has enrolled children since 2011. This study used the data set released in October 2019, and analysis was performed in January 2023. Maternal serum folic acid levels (≥10 ng/mL classified as exposed) during the second and third trimesters and the frequency of maternal folic acid supplementation during the first trimester and during the second and third trimesters of pregnancy (once a week or more was classified as exposed). The primary outcome was onset of Kawasaki disease in offspring up to age 12 months. Odds ratios (ORs) for each exposure were estimated, and propensity score-adjusted logistic regression was conducted on the basis of the sets of variables. The study population comprised 87 702 children who were followed-up for 12 months. Of these, 336 children developed Kawasaki disease. Mothers who took folic acid supplements (31 275 mothers [35.7%]; mean [SD] age, 32 [5] years) had higher serum folic acid levels than those who did not take supplements. Higher maternal serum folic acid levels were associated with a significantly lower risk of Kawasaki disease in offspring than lower levels (folic acid ≥10 vs <10 ng/mL, 56 of 20 698 children [0.27%] vs 267 of 64 468 children [0.41%]; OR, 0.68; 95% CI, 0.50-0.92). Children whose mothers took folic acid supplementation during the first trimester had a lower prevalence of Kawasaki disease than children whose mothers did not take folic acid (131 of 39 098 children [0.34%] vs 203 of 48 053 children [0.42%]), although the difference was not statistically significant (OR, 0.83; 95% CI, 0.66-1.04). Supplementation during the second and third trimesters was associated with a significantly lower risk of Kawasaki disease compared with no supplementation (94 of 31 275 children [0.30%] vs 242 of 56 427 children [0.43%]; OR, 0.73; 95% CI, 0.57-0.94). In this cohort study, higher serum folic acid levels (≥10 ng/mL) and maternal folic acid supplementation more than once a week during the second and third trimesters were associated with reduced risk of Kawasaki disease in offspring during infancy.

Impact of Medicaid Expansion on Abdominal Surgery Morbidity, Mortality, and Hospital Readmission

IntroductionMedicaid expansion's (ME) impact on postoperative outcomes after abdominal surgery remains poorly defined. We aimed to evaluate ME's effect on surgical morbidity, mortality, and readmissions in a state that expanded Medicaid (Virginia) compared to a state that did not (Tennessee) over the same time period. MethodsVirginia Surgical Quality Collaborative (VSQC) American College of Surgeons National Surgical Quality Improvement Program data for Medicaid, uninsured, and private insurance patients undergoing abdominal procedures before Virginia's ME (3/22/18-12/31/18) were compared with post-ME (1/1/19-12/31/19), as were corresponding non-ME state Tennessee Surgical Quality Collaborative (TSQC) data for the same 2018 and 2019 time periods. Postexpansion odds ratios for 30-d morbidity, 30-d mortality, and 30-d unplanned readmission were estimated using propensity score-adjusted logistic regression models. ResultsIn Virginia, 4753 abdominal procedures, 2097 pre-ME were compared to 2656 post-ME. In Tennessee, 5956 procedures, 2484 in 2018 were compared to 3472 in 2019. VSQC's proportion of Medicaid population increased following ME (8.9% versus 18.8%, P < 0.001) while uninsured patients decreased (20.4% versus 6.4%, P < 0.001). Post-ME VSQC had fewer 30-d readmissions (12.2% versus 6.0%, P = 0.013). Post-ME VSQC Medicaid patients had significantly lower probability of morbidity (−8.18, 95% confidence interval: −15.52 ∼ −0.84, P = 0.029) and readmission (−6.92, 95% confidence interval: −12.56 ∼ −1.27, P = 0.016) compared to pre-ME. There were no differences in probability of morbidity or readmission in the TSQC Medicaid population between study periods (both P > 0.05); there were no differences in mortality between study periods in VSQC and TSQC patient populations (both P > 0.05). ConclusionsME was associated with decreased 30-d morbidity and unplanned readmissions in the VSQC. Data-driven policies accounting for ME benefits should be considered.

Impact of DREAMS interventions on experiences of violence among adolescent girls and young women: Findings from population-based cohort studies in Kenya and South Africa.

DREAMS aims to reduce HIV incidence among adolescent girls and young women (AGYW) by tackling drivers of HIV risk including gender-based violence. We evaluate the impact of DREAMS on recent experiences of violence perpetuated by men against AGYW. AGYW cohorts were randomly selected from demographic platforms in South Africa (rural KwaZulu-Natal) and Kenya (Nairobi informal settlements and rural Gem sub-county). AGYW aged 13-22 years were enrolled in 2017 (Nairobi, KwaZulu-Natal) or 2018 (Gem), with annual follow-up to 2019. We described proportions of AGYW who self-reported experiences of violence perpetrated by males in the 12 months preceding the interview, overall and by form (physical, sexual, emotional). We investigated associations with DREAMS (invitation to participate during 2017-2018) through multivariable propensity score-adjusted logistic regression and estimated the causal effect of DREAMS on experiences of violence, under counter-factual scenarios in which all versus no AGYW were DREAMS beneficiaries. Among 852, 1018 and 1712 AGYW followed-up in 2019 in Nairobi, Gem and KZN, respectively, proportions reporting any violence in 2019 were higher in Nairobi (29%) than Gem (18%) and KwaZulu-Natal (19%). By sub-type, emotional and physical violence were more frequently reported than sexual violence. We found no evidence of an impact attributable to DREAMS on overall levels of violence, in any setting. Nor was there evidence of impact on sub-types of violence, with one exception: an increase in physical violence in Nairobi if all, versus no, AGYW were DREAMS beneficiaries (16% vs 11%; +5% difference [95% CI: +0.2%, +10.0%]). Experiences of gender-based violence were common among AGYW, especially in urban settings, and DREAMS had no measurable impact on reducing violence within three years of implementation. Violence prevention programming that reaches more men and the broader community, sustained for longer periods, may yield greater gains in violence reduction than AGYW-focused programming. Additionally, more investment in implementation research is needed to bridge trial-based study findings from efficacy to population-level effectiveness.

Tobacco quitline performance: Comparing the impacts of early cessation and proactive re-engagement on callers' smoking status at follow-up at 12 months.

While tobacco Quitlines are effective in the promotion of smoking cessation, the majority of callers who wish to quit still fail to do so. The aim of this study was to determine if 12-month tobacco Quitline smoking cessation rates could be improved with re-engagement of callers whose first Quitline treatment failed to establish abstinence. In an adaptive trial, 614 adult smokers, who were active duty, retired, and family of military personnel with TRICARE insurance who called a tobacco Quitline, received a previously evaluated and efficacious four-session tobacco cessation intervention with nicotine replacement therapy (NRT). At the scheduled follow-up at 3 months, callers who had not yet achieved abstinence were offered the opportunity to re-engage. This resulted in three caller groups: 1) those who were abstinent, 2) those who were still smoking but willing to re-engage with an additional Quitline treatment; and 3) individuals who were still smoking but declined re-engagement. A propensity score-adjusted logistic regression model was generated to compare past-7-day point prevalence abstinence at 12 months post Quitline consultation. Using a propensity score adjusted logistic regression model, comparison of the three groups resulted in higher odds of past-7-day point prevalence abstinence at follow-up at 12 months for those who were abstinent at 3 months compared to those who re-engaged (OR=9.6; 95% CI: 5.2-17.8; Bonferroni adjusted p<0.0001), and relative to those who declined re-engagement (OR=13.4; 95% CI: 6.8-26.3; Bonferroni adjusted p<0.0001). There was no statistically significant difference in smoking abstinence between smokers at 3 months who re-engaged and those who declined re-engagement (OR=1.39; 95% CI: 0.68-2.85). Tobacco Quitlines seeking to select a single initiative by which to maximize abstinence at follow-up at 12 months may benefit from diverting additional resources from the re-engagement of callers whose initial quit attempt failed, toward changes which increase callers' probability of success within the first 3 months of treatment. This study is registered at clinicaltrials.gov (NCT02201810).

8944 Outcomes Among Patients Undergoing Gender-Affirming Hysterectomy from 2010-2020: A NSQIP Analysis

<h3>Study Objective</h3> We utilized the American College of Surgeons National Surgical Quality Improvement Program (ACS NSQIP) database, to study reoperation rates after benign hysterectomy in transgender and gender nonconforming (TGNC) patients. <h3>Design</h3> Demographic data and surgical outcomes between 2010-2020 were abstracted from the ACS NSQIP database. <h3>Setting</h3> ACS NSQIP Database. <h3>Patients or Participants</h3> Current Procedural Terminology (CPT) codes were used to identify patients who underwent hysterectomy for non-oncologic indications. ICD-9/10 codes were used to identify patients with gender dysphoria. 445,997 hysterectomies were performed between 2010-2020, of which 2,011 (0.45%) were for TGNC patients. <h3>Interventions</h3> Associations between gender dysphoria and unplanned re-operation were examined using propensity score-adjusted logistic regression. Propensity scores were calculated using the variables of: Age, race, BMI, ethnicity, hypertension requiring medication, and diabetes. <h3>Measurements and Main Results</h3> The percent of hysterectomies for TGNC patients increased between 2010-2020 (21 (1.0%) to 379 (18.6%), p< 0.01). TGNC Patients were younger (mean age 35.6 vs. 49.5), less likely to use anti-hypertensive medications (12.7 % vs. 29.7%), and less likely to have diabetes (4.4% vs. 9.7%), compared to non-TGNC patients, p< 0.001. Body mass index was similar between groups (28.3 IQR [24.2, 33.4] vs. 29.9 IQR [25.5, 35.7]). The risk of reoperation in this cohort was low overall (6,600 (1.5%)), and similar between groups (6,568 (1.5%) vs. 32 (1.6%), p = 0.747). A propensity-score adjusted linear regression demonstrated no increased risk of reoperation for cisgender compared to gender diverse patients (aOR 1.01 95%CI [0.99-1.01]). <h3>Conclusion</h3> Benign hysterectomy carries a low overall risk of reoperation. There was no difference in reoperation among TGNC patients, even when controlling for differences in health status. Hysterectomy continues to be a safe, medically necessary procedure for TGNC patients.

Increased Frequency of Severe Hypoglycemia with the Modified-Release Gliclazide Compared to Glimepiride in Diabetic Older Adults; Propensity Score-Adjusted Analysis.

ObjectiveThe main aim is to compare the risk of severe hypoglycemia associated with the modified-release (MR) gliclazide against glimepiride in diabetic older adults.MethodsAll older adult diabetic patients who attended the emergency department (ED) between the 1st of Aug. 2017 and the end of Mar 2020 on gliclazide MR or glimepiride are included in two cohorts. We compared baseline differences between cohorts in demographics, lab results, diabetes complications, comorbidities, and drugs using the chi-squared test for categorical variables and unpaired t-test for continuous variables. All the baseline variables are used in a logistic regression to produce the propensity scores for receiving gliclazide MR. The primary outcome was Severe Hypoglycemia requiring Emergency Admission (SHEA). We used documented hypoglycemia, falls, fractures, Cardiovascular ED Admission (CVEA), and recurrent ED admissions as secondary outcomes. We used a univariate logistic regression followed by a propensity score-adjusted logistic regression to identify the adjusted odds ratio. We did a subgroup analysis for low and moderate-high doses users.ResultsWe included 2320 patients, 1786 were on gliclazide MR while 534 were on glimepiride. The risk of SHEA (Adjusted Odds Ratio AOR 6.74, p=0.002), falls (AOR 1.43, p=0.003), fractures (AOR 1.43, p=0.01), CVEA (AOR 1.66, p<0.001), recurrent ED admission (AOR 1.39, p=0.002) were significantly higher. At the same time, documented hypoglycemia was insignificantly higher (AOR 1.17, p= 0.444) with gliclazide MR compared to glimepiride. The low doses of both treatments did not show any SHEA cases, while the results with higher doses showed the same pattern of increased risk with gliclazide MR as the principle analysis.ConclusionUsing gliclazide MR for older patients may not be a relatively safer alternative to avoid severe hypoglycemia and its possible consequences compared to glimepiride. It may be added to glimepiride in the Beers list of medications to be avoided in older adults.

Effectiveness of Clipping for Definitive Colonic Diverticular Bleeding in Preventing Early Recurrent Bleeding.

Objective Clipping is a common technique for managing colonic diverticular bleeding (CDB), despite the lack of published evidence regarding its effectiveness. We aimed to evaluate the effectiveness of clipping for CDB in preventing early recurrent bleeding. Methods This dual-center retrospective study included 93 patients who underwent emergency hospitalization for bloody stool, diagnosed with definitive CDB, and treated with clipping or conservative treatment. The primary outcome was early recurrent bleeding. A logistic regression analysis was performed to assess the association between the occurrence of early recurrent bleeding and clipping with adjustment for propensity scores. Secondary outcomes included death, transfusion, length of hospitalization, need for transcatheter arterial embolization or surgery, and adverse events. Results The patient characteristics were similar between the clipping (n=85) and conservative treatment (n=8) groups. The rate of early recurrent bleeding was significantly lower in the clipping group than in the conservative treatment group [23.5% (20 cases) vs. 75% (6 cases), p=0.005]. In the propensity score-adjusted logistic regression analysis, the odds ratio for early recurrent bleeding in the clipping group was 0.094 (95% confidence interval, 0.008-0.633, p=0.026). Secondary outcomes were not significantly different between the two groups. Stigmata of recent hemorrhage (SRH) at the time of recurrent bleeding was identified in 79.2% of patients (19/24). In the clipping group, recurrent bleeding was observed in 62.5% of cases (10/16) from the same diverticulum. However, early recurrent bleeding tended to be less likely with direct clipping (p=0.072). Conclusion Clipping for definite CDB was more effective in preventing early recurrent bleeding than conservative treatment.

The Impact of Delayed-Phase Imaging at Admission on the Management of Urinary Extravasation in High-Grade Renal Trauma.

American Urological Association Urotrauma guidelines recommend delayed-phase imaging on presentation for all renal injuries, although data to support it are anecdotal. Forgoing delays risks unrecognized collecting system injuries. We hypothesized that renal trauma patients without admission delays have more complications from urinary extravasation. From 2005 through 2020, 1,751 renal trauma patients were identified from our institutional trauma registry. Included patients had an estimated American Association for the Surgery of Trauma renal injury grade of III-V and a perinephric fluid collection. Propensity scores for receipt of delayed-phase imaging were calculated based on Injury Severity Score, arrival condition, admission systolic blood pressure, sex and renal injury grade. Propensity score-adjusted logistic regression was used to compare clinical outcomes between those with and without admission delays. Ninety (28.6%) of 315 included patients had delays on presentation. Patients without delays had higher Injury Severity Scores (29 vs 23, p=0.002), fewer isolated renal injuries (27.6% vs 38.9%, p=0.05) and lower grade renal injuries (56.9% vs 41.1% grade 3, p=0.03). After propensity score adjustment, patients with delays were more likely to undergo immediate interventions (OR 11.75, 95% CI 2.99-78.10) and interval stent placement for urinary extravasation (OR 6.86, 95% CI 1.56-47.64) without a difference in urological complications (OR 5.07, 95% CI 0.25-766.16). Delayed-phase imaging was associated with an increased odds of undergoing immediate and asymptomatic interval urological interventions without a difference in the odds of a complication after high-grade renal trauma. Post-trauma urinary extravasation requires further research to determine which patients require imaging and intervention.

Percutaneous Endoscopic Gastrostomy Reduces Aspiration Pneumonia Rate in Stroke Patients with Enteral Feeding in Convalescent Rehabilitation Wards.

ABSTRACTObjectives:The effect of percutaneous endoscopic gastrostomy (PEG) on the prevention of aspiration pneumonia and improvements in activities of daily living (ADL) for enteral feeding-dependent stroke patients is unclear. We sought to clarify differences in the rates of aspiration pneumonia and ADL improvement between stroke patients receiving PEG and those receiving nasogastric tube feeding (NGT) in convalescent rehabilitation wards.Methods:We assessed 10 years of data from the Kaga Regional Cooperation Clinical Pathway for Stroke, which covers patients in the southern district of Ishikawa Prefecture of Japan. Logistic regression analysis with propensity score adjustment was used to examine how the enteral feeding method affected aspiration pneumonia rates. Linear regression analysis, adjusted by propensity scores, was also performed to ascertain the effect of the enteral feeding method on ADL improvement.Results:Overall, 47 patients with PEG and 49 patients with NGT were analyzed. The incidence of aspiration pneumonia was 4.67 times higher in the NGT group than in the PEG group in the propensity score-adjusted logistic regression analysis (odds ratio 4.67, 95% confidence interval 1.30–16.67, P=0.02). The enteral feeding method had no significant effect on ADL improvement in the propensity score-adjusted linear regression analysis.Conclusions:In convalescent rehabilitation wards, aspiration pneumonia was more likely to occur in stroke patients with NGT than in those with PEG; however, the enteral feeding method did not affect ADL improvement. These results provide a basis for determining the appropriate enteral feeding method for stroke patients who cannot take adequate nutrition orally during convalescence/rehabilitation.

310. The Impact of Microscan versus Vitek-2 for Automated Susceptibility Testing on the Utilization of Vancomycin Alternatives for the Treatment of Methicillin-Resistant Staphylococcus aureus Bacteremia

BackgroundAutomated susceptibility testing (AST) provides minimum inhibitory concentrations (MIC) to guide effective antibiotic therapy. AST is critical for methicillin-resistant Staphylococcus aureus (MRSA) bacteremia, as susceptible MIC values ≥ 1.5 µg/mL are associated with vancomycin (VAN) failure. The Microscan (MS) instrument may report elevated MIC values compared to Vitek-2 (VTK), thus impacting treatment. This study aimed to evaluate the impact of MS versus VTK on VAN alternative use in the treatment of MRSA bacteremia in a Texas health system.MethodsThis was a retrospective cohort study of patients admitted to the Ascension Seton health system in Austin, TX. Patient eligibility included: age ≥18 years, ≥1 positive MRSA blood culture, ≥72 hours of MRSA therapy, and VAN use within 48 hours of positive culture. Patients were stratified into the MS group (May 2013-Dec 2016) and VTK group (Jun 2017-Mar 2020). The primary outcome was therapy switch from VAN to VAN alternatives. Secondary endpoints include S. aureus MIC, 30-day all-cause mortality, 30 and 90-day readmission, and length of hospital stay (LOS). Outcomes were compared between groups using appropriate bivariable comparisons, as well as multivariable logistic regression and propensity score-adjusted logistic regression.ResultsA total of 199 patients were included: 91 in the MS group and 108 in the VTK group. Switch to VAN alternative was 56% vs. 19% (p< 0.0001) for MS and VTK, respectively. The median (interquartile range) MIC value reported was 2 μg/mL (2 – 2) and 1 μg/mL (0.5 – 1) for MS and VTK, respectively (p< 0.0001). Thirty-day readmission (19% vs. 20%, p=0.7647) and 30-day mortality (10% vs. 9%, p=0.5262) were comparable between MS and VTK groups, respectively. Hospital LOS significantly decreased in the VTK period (16 days vs. 12 days, p=0.0153). The MS group was the only independent positive predictor of VAN alternative therapy: logistic regression, OR 5.64 (95% CI 1.67–18.99) and propensity score adjusted, OR 4.21 (95% CI 1.32–13.48).ConclusionSince implementation of VTK from MS, Ascension Seton hospitals experienced a decreased median VAN MIC for MRSA bacteremia as well as therapy switches from VAN to VAN alternatives without affecting other patient health outcomes.Disclosures All Authors: No reported disclosures

Effectiveness of Chemoradiotherapy for Metachronous Esophageal Squamous Cell Carcinoma

Introduction: Multiple Lugol-voiding lesions (LVLs) in the esophagus increase the risk of synchronous and metachronous development of esophageal squamous cell carcinoma (ESCC). Chemoradiotherapy (CRT) following endoscopic submucosal dissection (ESD) may reduce the incidence of metachronous ESCC, but few studies have investigated this. Therefore, we retrospectively examined the effect of CRT on metachronous ESCC and multiple esophageal dysplasias visible as multiple LVLs. Methods: This study reviewed 146 patients who underwent esophageal ESD and were determined pathologically to have noncurative resection. They were divided into 2 groups: those who received additional CRT (CRT group; n = 64) and those without additional treatment (control group; n = 82). Incidence of metachronous ESCC was analyzed using propensity scores to adjust for patient characteristics. The number of multiple LVLs was also examined. Results: The CRT group was significantly younger than the control group (mean 66.6 vs. 70.6 years, p = 0.011), had significantly deeper tumor invasion (p = 0.013), and had a significantly higher rate of lymphovascular invasion (47.8 vs. 12.2%, p < 0.001). The CRT group also had a significantly higher improvement rate of multiple LVLs (58.1 vs. 2.0%, p < 0.001). The LVLs after CRT had a distinctive irregular crack-shaped appearance. Metachronous ESCC was found in 7 patients (10.9%) in the CRT group and in 17 patients (20.7%) in the control group (p = 0.113). In propensity score-adjusted logistic regression analysis, the odds ratio for metachronous ESCC in the CRT group was 0.316 (p = 0.023). The occurrence rate was significantly lower in the CRT group than in the control group. Discussion/Conclusion: CRT may be effective in preventing metachronous ESCC.

Incidence, prognosis, and risk factors for bladder and bowel dysfunction due to incidental dural tears in lumbar microendoscopic surgery

BACKGROUND CONTEXTDespite the common occurrence of incidental dural tears, the incidence and prognosis of bladder and bowel dysfunction (BBD) due to incidental dural tears in lumbar spinal surgery are not well known because of the lack of reported cases. PURPOSETo analyze the incidence, prognosis, and risk factors for BBD after lumbar microendoscopic surgery with or without incidental dural tears. STUDY DESIGN/SETTINGA retrospective cohort study. PATIENT SAMPLEWe analyzed 2,421 patients who underwent lumbar microendoscopic surgery and investigated patients with BBD after an incidental durotomy during surgery. OUTCOME MEASURESPatients were divided into three groups on the basis of dysuria and defecation disorders: severe BBD, mild BBD, and no BBD. The post void residual volumes before and after surgery were compared using an ultrasound bladder scanner or bladder catheterization after confirmation of urination. Bowel dysfunction was evaluated by subjective symptomatic deterioration and the increase in the frequency and duration of postoperative medical care. METHODSRisk factors for BBD were analyzed using surgical video documentation to determine the dural tear site and cauda equina exposure from the dural sac. Patients with BBD were prospectively followed up for prognosis determination. The chi-square test was used to compare the incidence of BBD between patients with dural tears and those without. Propensity score-adjusted logistic regression analysis was performed to evaluate the effects of various factors on the incidence of postoperative BBD. RESULTSThe incidence of dural tears was 6.9% (168/2,421). The overall incidence of BBD was 3.0% (73/2,421), while the incidences of BBD (mild+severe BBD) and severe BBD due to incidental dural tears were 1.2% (30/2,421) and 0.8% (20/2,421), respectively. The incidence of BBD in patients with dural tears and those without tears was 17.9% [30/168] and 1.9% [43/2,253; p<.001]), respectively. BBD rates at 1 week, 1 month, 3 months, 6 months, and 1 year after surgery were 64.0%, 44.0%, 40.0%, 28.0%, and 13.6%, respectively. Logistic regression analysis revealed that the male sex (odds ratio [OR], 4.20), dural tears in the central area (OR, 10.15), and exposure of the cauda equina (OR, 51.04) were significant risk factors. CONCLUSIONSThe incidence of dural tears in lumbar microendoscopic surgeries are associated with an increased incidence of BBD. The recovery rate for BBD due to incidental dural tears is generally good; however, some patients experience long-term symptoms. Clinicians should be aware that incidental dural tears with cauda equina exposure can increase the risk of BBD.

Acute normovolemic hemodilution reduced allogeneic blood transfusion without increasing perioperative complications in patients undergoing free-flap reconstruction of the head and neck.

PurposeThe present case–control study was conducted to evaluate whether acute normovolemic hemodilution (ANH) can reduce the need for perioperative allogeneic blood transfusion (ABT) and affect the incidence of perioperative complications in free-flap reconstruction of the head and neck.MethodsThis single-center, retrospective, observational study included the perioperative data of 123 patients who underwent free-flap reconstruction of the head and neck following oncological surgery. Patients were divided into the following two groups according to whether they received ANH: ANH group and non-ANH group. We investigated whether ANH can reduce the need for perioperative ABT using propensity score-adjusted logistic regression analysis.ResultsOf the 123 patients, 113 patients were assessed; 57 patients were in the ANH group and 56 patients were in the non-ANH group. The rate [ANH group vs. non-ANH group, n (%): 2 (3.5%) vs. 23 (41.1%), p < 0.0001] and amount [median (IQR): 0 mL (0, 0) vs. 0 mL (0, 280), p < 0.0001] of ABT were significantly lower in the ANH group than in the non-ANH group. Propensity score-adjusted multivariate logistic regression analysis indicated that ANH use [odds ratio (OR): 0.040; 95% confidence interval (CI) 0.005, 0.320; p = 0.0024)] was one of the independent predictors of perioperative ABT. There were no significant differences in the incidences of post-operative complications between the two groups.ConclusionANH use can reduce the need for perioperative ABT in patients undergoing free-flap reconstruction of the head and neck without increasing the incidence of post-operative complications.

Investigation of a possible association of potentially inappropriate medication for older adults and frailty in a prospective cohort study from Germany.

Objectivepotentially inappropriate medications (PIMs) are commonly defined as drugs that should be avoided in older adults because they are considered to have a negative risk-benefit ratio. PIMs are suspected to increase the risk for frailty, but this has yet to be examined.Designprospective population-based cohort study.Setting and participantsa German cohort of community-dwelling older adults (≥60 years) was followed from October 2008 to September 2016.Methodsin propensity score-adjusted logistic and Cox regression models, associations between baseline PIM use and prevalent/incident frailty were investigated. Frailty was assessed using the definition by Fried and co-workers, PIM were defined with the 2015 BEERS criteria, the BEERS criteria to avoid in cognitively impaired patients (BEERS dementia PIM), the EU(7)-PIM and the PRISCUS list.Resultsof 2,865 participants, 261 were frail at baseline and 423 became frail during follow-up. Only BEERS dementia PIM use was statistically significantly associated with prevalent frailty (odds ratio (95% confidence interval), 1.51 (1.04–2.17)). The strength of the association was comparable for all frailty components. Similarly, in longitudinal analyses, only BEERS dementia PIM use was associated with incident frailty albeit not statistically significant (hazard ratio, 1.19 (0.84–1.68)).Conclusionsthe association of PIM use and frailty seems to be restricted to drug classes, which can induce frailty symptoms (anticholinergics, benzodiazepines, z-substances and antipsychotics). Physicians are advised to perform frailty assessments before and after prescribing these drug classes to older patients and to reconsider treatment decisions in case of negative performance changes.

Utility of autologous fibrin glue and polyglycolic acid sheet for preventing delayed bleeding associated with antithrombotic therapy after gastric ESD.

Background and study aims Delayed bleeding is one of the most serious adverse events of gastric endoscopic submucosal dissection (ESD), especially in patients taking antithrombotic therapy. This study aimed to evaluate the utility and safety of a shielding method with autologous fibrin glue and polyglycolic acid (PGA) sheets for patients undergoing gastric ESD who are receiving antithrombotic therapy. Patients and methods One hundred twenty-three patients who were treated with gastric ESD while receiving antithrombotic therapy between December 2014 and September 2017 were enrolled in this study. Patients who received the shielding method were classified into the shielding group. Others were classified into the conventional group. Various clinico-pathological factors were retrospectively compared between the two groups. Results The shielding group consisted of 38 patients, and the conventional group consisted of the remaining 85 patients. In the shielding group, the rate of continuation of antithrombotic therapy was significantly higher (68.4 % vs 41.2 %). Incidence of delayed bleeding was lower in the shielding group (2.6 %, 1/38) than in the conventional group (14.1 %, 12/85). In the propensity score-adjusted logistic regression analysis, the delayed bleeding rate in the shielding group tended to be lower than in the conventional group ( P = 0.070). Allogeneic transfusion was performed in eight patients (8/85, 9.4 %) in the conventional group and none in the shielding group ( P = 0.047). No adverse event associated with endoscopic shielding were observed in the shielding group. Conclusions This study suggests that a shielding method with autologous fibrin glue and PGA sheet effectively prevents delayed bleeding after gastric ESD in patients receiving antithrombotic therapy.

Impact of pelvic immobilization techniques on the outcomes of primary and secondary closures of classic bladder exstrophy

A potential determinant of successful bladder closures in patients with classic bladder exstrophy (CBE) is the postoperative pelvic immobilization technique. This study investigates the success rates of primary and secondary bladder closures based on various immobilization techniques from a high-volume exstrophy center. A prospectively maintained institutional exstrophy-epispadias complex database of 1336 patients was reviewed for patients with CBE who have undergone primary or secondary closures between 1975 and 2018 and subsequently had a known method of pelvic immobilization. Patients were divided into two groups: primary and secondary closures. Associations between closure outcomes and immobilization techniques were determined. A total of 476 patients with primary closures and 101 patients with secondary closures met the inclusion criteria. In total, 343 (72.1%) primary closures were successful. As shown in the table, the success rates of primary closures were highest in patients immobilized with modified Buck's and Bryant's traction (95.0% and 79.3%, respectively) and lowest in those with spica cast (49.6%). A propensity score-adjusted logistic regression (adjusting for osteotomy status, period of closure, location of closure, and closure type) revealed that modified Buck's traction had a 5.60 (95% confidence interval 1.74-23.1, p=0.008) greater odds of success compared to spica casting during the primary closure. For the secondary closure group, there were 92 (92.1%) successful secondary closures. Success rates were highest in modified Buck's traction (97.3%) and lowest with spica casting (66.7%). This study confirms previous findings of better outcomes when patients are immobilized with external fixation and Buck's traction after adjusting for potential confounding factors. Immobilization with modified Buck's or Bryant's traction yielded significantly higher primary closure success rates when compared to spica casting. It is the authors' belief that despite a longer hospital length of stay, external fixation with Buck's traction provides the best chance of a successful closure and, thus, a financially responsible method to care for these children in the postoperative period. Success rates for primary closures were highest when using modified Buck's traction with external fixation and lowest for spica casts. Similarly, for secondary closures, the best outcomes were achieved using modified Buck's traction with external fixation and the lowest success rates were associated with spica casts.

Comparison of the Transarterial and Transthoracic Approaches in Nontransfemoral Transcatheter Aortic Valve Implantation

Transfemoral approach stands as the reference access-route for transcatheter aortic valve implantation (TAVI). Nonetheless, alternatives approaches are still needed in a significant proportion of patients. This study aimed at comparing outcomes between transthoracic-approach (transapical or transaortic) and transarterial-approach (transcarotid or subclavian) TAVI. Data from 191 consecutive patients who underwent surgical-approach TAVI from May 2009 to September 2017 were analyzed. Patients were allocated in 2 groups according to the approach. The primary end point was the 30-day composite of death of any cause, need for open surgery, tamponade, stroke, major or life-threatening bleeding, stage 2 or 3 acute kidney injury, coronary obstruction, or major vascular complications. During the study period, 104 patients underwent transthoracic TAVI (transapical: 60.6%, transaortic: 39.4%) whereas 87 patients underwent transarterial TAVI (subclavian: 83.9%, transcarotid: 16.1%). Logistic EuroSCORE I tended to be higher in transthoracic-TAVI recipients. In-hospital and 30-day composite end point rates were 25.0% and 11.5% (p = 0.025), and 26.0% and 14.9% (p = 0.075) for the transthoracic and transarterial cohorts, respectively. Propensity score-adjusted logistic regression demonstrated no significant detrimental association between the 30-day composite end point and transthoracic access (odds ratio 2.12 95% confidence interval 0.70 to 6.42; p = 0.18). Transarterial TAVI was associated with a shorter length of stay (median: 6 vs 7 days, p <0.001). TAVI approach was not an independent predictor of midterm mortality. In conclusion, nontransfemoral transarterial-approach TAVI is safe, feasible, and associated with comparable rates of major perioperative complications, and midterm mortality compared with transthoracic-approach TAVI.

Abstract MP15: Aspirin is Effective in Preventing Venous Thromboembolism After Knee or Hip Arthroplasty

Introduction: Venous thromboembolism (VTE) is a known complication of major orthopedic surgery. Although guidelines now allow the use of aspirin as an alternative to anticoagulants as VTE prophylaxis after knee or hip arthroplasty, there is limited data on contemporary use and outcomes with aspirin. We conducted a retrospective cohort study to describe antithrombotic agents used after knee and hip arthroplasty and post-operative VTE outcomes. Hypothesis: We assessed the hypothesis that VTE prevention with aspirin was not related to an increased risk of postoperative VTE after knee or hip arthroplasty compared to anticoagulation. Methods: We used data from MedAssets, which is an administrative database containing billing details on the patient-level from about 400 hospitals in the U.S., and included all adults with a principal hospital discharge diagnosis of knee or hip arthroplasty based on International Classification of Diseases, 9 th edition (ICD-9) codes between January 1, 2013, and December 31, 2014. We identified charges for medications used for VTE prophylaxis within 7 days after the index surgery. The primary outcome was postoperative VTE, identified by searching for VTE-specific ICD-9 codes from the index hospitalization, rehospitalization within 30 days, or during an outpatient visit within 90 days. We compared postoperative VTE risk between patients receiving aspirin-only and those receiving anticoagulants using propensity score-adjusted multivariable logistic regression models adjusted for VTE risk factors, hospital characteristics and length of stay. Results: We identified 74,234 patients who underwent knee arthroplasty and 36,192 with hip arthroplasty who received pharmacologic VTE prophylaxis. The most common post-operative anticoagulant medications were warfarin (25.2%; 27,850 of 110,426) and enoxaparin (24.1%; 26,560 of 110,426). Aspirin was used as the sole agent in 27.0% (20,047 of 74,234) of knee and 29.8% (10,769 of 36,192) of hip arthroplasties. Patients receiving only aspirin were younger and had fewer comorbidities compared to those who received anticoagulants. Postoperative VTE events occurred in 495 of 74,234 (0.67%) patients undergoing knee arthroplasty and 145 of 36,192 (0.40%) undergoing hip arthroplasty. Patients who received only aspirin after surgery did not have a higher risk for postoperative VTE compared to patients who received anticoagulants: adjusted odds ratio 0.92; 95% CI, 0.61-1.39 for knee and adjusted odds ratio 0.73; 95% CI, 0.56-0.95 for hip arthroplasty. Conclusions: In conclusion, aspirin was the most frequently administered individual antithrombotic agent in a large contemporary sample of U.S. patients undergoing knee or hip arthroplasty. Postoperative VTE prophylaxis with aspirin-only may be a safe option in this population and was not associated with a higher risk of postoperative VTE compared to anticoagulants.

Inverted Rearfoot posture in subjects with coexisting patellofemoral osteoarthritis in medial knee osteoarthritis: an exploratory study

BackgroundWhile abnormal rearfoot posture and its relationship to patellofemoral (PF) pain has been thoroughly discussed in the literature, its relationship to patellofemoral osteoarthritis (PFOA) has not been determined. This study aimed to examine whether rearfoot posture is associated with a higher prevalence of radiographic PFOA in a compartment-specific manner in patients with medial tibiofemoral osteoarthritis (TFOA).MethodsParticipants from orthopedic clinics (n = 68, age 56–90 years, 75.0% female), diagnosed with radiographic medial TFOA (Kellgren/Lawrence [K/L] grade ≥ 2) were included in this study. The presence of PFOA and static rearfoot posture were evaluated using a radiographic skyline view and a footprint automatic measurement apparatus, respectively. The relationship between rearfoot posture and PFOA was examined using analysis of covariance and propensity score-adjusted logistic regression analysis.ResultsOn average, patients with coexisting PFOA and medial TFOA (n = 39) had an inverted calcaneus 3.1° greater than those with isolated medial TFOA (n = 29). Increased calcaneus inverted angle was significantly associated with a higher probability of the presence of medial PFOA (odds ratio: 1.180, 95% confidence interval: [1.005, 1.439]; p = 0.043). Calcaneus inverted angle was not associated with higher odds of lateral PFOA presence based on the adjusted values.ConclusionsThe presence of an inverted rearfoot was associated with PFOA. Although these findings do not clearly indicate a biomechanical link between rearfoot posture and PFOA, this study shed light on the potential relationship between altered rearfoot posture and PFOA, as can be seen between rearfoot abnormality and PF pain.