ALBERT

Description: Alumina powder was added to dielectric fluid during Electrical discharge machining (EDM) of AISI 304 steel. The main machining parameters of current (A), tool diameter (mm) and powder concentration (g/L) were chosen to determine the EDM machining characteristics of material removal rate (MRR), tool wear rate (TWR) and surface roughness (Ra). This work adopted two-level full factorial experiments. The significant factors that affect the MRR and tool TWR are current, tool diameter and powder concentration. The MRR increases when the current and tool diameter are higher. The presence of powder concentration also increases the MRR. The higher current used and the presence of powder concentration increase the TWR. Meanwhile, a smaller tool diameter gives higher value of TWR. Current and powder concentration are the significant factors to determine the surface roughness of work surfaces. Higher current applied gives high surface roughness, but higher powder concentration gives improve...

Description: Introduction: The number of patients with sickle cell disease (SCD) approaches 100,000 in US after adjusting for early mortality (Hassell Am J Prev Med 2010). Management of SCD and its complications require frequent access to healthcare system lifelong, thus impacting patients' quality of life and cost of healthcare. Chronic pain inducing illnesses are known to increase susceptibility to mental health disorders (Rayner Pain 2016). Psychosocial disorders are common in this population and impact the course of hospitalization, however we have limited published data in this area. Hence, we performed a large retrospective study utilizing the National Inpatient Sample (NIS) data to evaluate the prevalence of mental health disorders in hospitalized sickle cell patients, and their influence on length of hospitalization. Methods: We identified hospitalized sickle cell patients using ICD 9 codes (282.5,282.6X -282.6X ) in the National Inpatient Sample (NIS) database. Similarly, ICD-9 codes were used to identify patients with mental health disorders of interest. The demographics and length of hospital stay of patients with and without mental health disorders were then compared. Surveyfreq was used to calculate proportions and surveymeans was used to calculate median length of stay and hospital charges. Cochran-Armitage test was used for analyzing trends. We used chi-square for categorical data frequency, P value of 〈 0.05 was considered statistically significant. All analysis was performed using SAS 9.4. Results: We identified a total of 1,349,701 hospitalizations for sickle cell patients between 2003-2014, of which 221,279 (16%) had associated mental health disorders. Mood disorders were most common (40%), followed by substance abuse (28%) and anxiety disorder (16%) (Table 1). Over the timeline of our study, we found a longitudinal trend towards higher prevalence of mental health disorders in hospitalized sickle cell patients (Figure 1). There was higher prevalence of mental health disorders among patients aged between 21-40 years (24%). No difference in the rate of mental health disorders was noted in patients admitted with or without acute sickle cell pain episode. Median length of hospital stay (LOS) was 4 days in patients with mental health disorders (95% CI 4.04-4.12) compared to 3 days in those without (95% CI 3.17-3.20). Conclusion: The prevalence of mental health disorders in hospitalized sickle cell patients has been gradually increasing from 2003 to 2014 and approaches 16% overall. The length of hospital stay is longer for the individuals with these disorders than those without hence, increasing the cost of health care and reducing patient satisfaction. Therefore, early recognition and intervention for mental health disorders is paramount to promote quality of life and reduce health care costs. This demands for a multidisciplinary approach to provide better access to mental health resources to this population in the outpatient setting. Disclosures No relevant conflicts of interest to declare.

Description: Background: Sickle cell disease (SCD) is a common hemoglobinopathy, characterized by vaso-occlusive crises and affects over 100,000 people in United States. It afflicts long-lasting organ damage with a spectrum of clinical severity. Median survival for SCD is shortened to the 6th decade of life despite advances in medical care (Elmariah et al Am J Hematol 2014). Allogeneic stem cell transplant (SCT) is a potentially curative option and is increasingly considered in patients with severe symptomatic SCD. The use of SCT is limited by donor availability and treatment related complications. Several advancements in conditioning regimen and use of alternate donor source have favorably impacted the feasibility of this approach. We identified SCT performed for sickle cell disease in the Healthcare Cost and Utilization Project National Inpatient Sample (HCUP-NIS) from 2002-2014 in an attempt to identify hospitalization outcomes, factors affecting length of stay and healthcare utilization. Methods: HCUP-NIS is a 20% stratified sample of all discharges from hospitals across 46 states in the United States and incorporates weighting algorithms to predict nationwide estimates. We used International Classification of Diseases, Ninth Revision (ICD-9) procedure codes to identify HCT hospitalizations {Bone marrow (BM):41.02, 41.03, Peripheral blood (PB): 41.05, 41.08 and Cord blood (CB): 41.06} for sickle cell disease (282.5,282.6X -282.6X). We excluded patients who underwent SCT for indications other than SCD. Surveyfreq was used to calculate proportions and surveymeans was used to calculate median length of stay and hospital charges. Kruskal-Wallis test was used for non-parametric data. Chi-square for categorical data frequency, P value of 〈 0.05 was statistically significant. All analysis was performed using SAS 9.4. Results: Outcomes were analyzed from a total of 742 hospitalizations for SCT from 2002-2014 (table 1). Median age for stem cell transplant was 9 years. GVHD occurred in 14% of stem cell transplants. Overall, in-hospital mortality was low at 2.6% while mortality in patients who developed GVHD was 14%. Bacterial infections (including C.difficile) occurred more commonly than viral or fungal infections (table 2). Patients who developed graft vs host disease (GVHD) were also more likely to have bacterial, viral and fungal infections than those without. Pain crisis was noted in 9% of total admissions while stroke occurred in 6%. Median length of stay (LOS) was 35 days and median charges were $359,646. If GVHD developed, median LOS increased to 54 days while median charges increased to $712,324. Similarly, bacterial sepsis was associated with a longer median LOS of 63 days while median charges increased to $626,986 (table 3). Conclusions: The rate of inpatient mortality with SCT in sickle cell disease is lower than the overall inpatient mortality rate for allogeneic SCT (7%; Godara et al bbmt 2018), indicating a favorable outcome for these patients. Infections do occur commonly during the course of hospitalization, especially in association with GVHD. Length of stay is adversely impacted by occurrence of GVHD, bacterial sepsis, C.difficile infection and viral infections. While we are limited by duration of follow up in our study, these patterns suggest some essential modifiers for inpatient morbidity and mortality, therefore require validation in a large prospective study. Disclosures No relevant conflicts of interest to declare.