The relationship between fatty liver index and bone mineral density in Koreans: KNHANES 2010-2011.

Analyses using a nationally representative cohort have revealed that high fatty liver index (FLI) is associated with low bone mineral density (BMD) regardless of insulin resistance in men, thereby supporting the deteriorated bone metabolism in nonalcoholic fatty liver disease (NAFLD). INTRODUCTION: NAFLD is linked to deteriorated bone health. We investigated the association of FLI, a scoring model for NAFLD, with BMD. METHODS: This was a population-based, cross-sectional study from the Korea National Health and Nutrition Examination Surveys including 4264 Koreans (1908 men and 2356 women). FLI was calculated using body mass index, waist circumference, serum triglyceride, and gamma-glutamyltranspeptidase level. Insulin resistance was evaluated using the homeostasis model assessment-estimated insulin resistance (HOMA-IR) index. BMD was measured using dual-energy X-ray absorptiometry at the lumbar spine, total hip, femoral neck, and whole body. RESULTS: Men had a higher FLI than women, while the HOMA-IR index was similar between men and women. The significant association between FLI and BMD was observed only in men, but not in women. FLI was negatively correlated with total hip, femoral neck, and whole body BMD in men after adjusting for all potential confounders, including HOMA-IR (P < 0.001 to 0.010). Lumbar spine, total hip, femoral neck, and whole body BMD in men showed a decreasing trend as the FLI tertile increased after adjusting for all potential confounders, including HOMA-IR (P for trends < 0.001 to 0.034). In men aged 50 years or older, odds ratios for combined osteopenia and osteoporosis increased across increasing FLI tertiles after adjusting for confounders (P for trends < 0.011 to 0.029). CONCLUSION: NAFLD is associated with low bone density regardless of insulin resistance in men. These findings suggest an undiscovered direct link between liver and bone that increases the risk of osteoporosis in men with NAFLD.

Transoesophageal echocardiographic evaluation of central venous catheter positioning using Peres' formula or a radiological landmark-based approach: a prospective randomized single-centre study.

BACKGROUND: The lower superior vena cava (SVC), near its junction with the right atrium (RA), is considered the ideal location for the central venous catheter tip to ensure proper function and prevent injuries. We determined catheter insertion depth with a new formula using the sternoclavicular joint and the carina as radiological landmarks, with a 1.5 cm safety margin. The accuracy of tip positioning with the radiological landmark-based technique (R) and Peres' formula (P) was compared using transoesophageal echocardiography. METHODS: Real-time ultrasound-guided central venous catheter insertion was done through the right internal jugular or subclavian vein. Patients were randomly assigned to either the P group (n=93) or the R group (n=95). Optimal catheter tip position was considered to be within 2 cm above and 1 cm below the RA-SVC junction. Catheter tip position, abutment, angle to the vascular wall, and flow stream were evaluated on a bicaval view. RESULTS: The distance from the skin insertion point to the RA-SVC junction and determined depth of catheter insertion were more strongly correlated in the R group [17.4 (1.2) and 16.7 (1.5) cm; r=0.821, P<0.001] than in the P group [17.3 (1.2) and 16.4 (1.1) cm; r=0.517, P<0.001], with z=3.96 (P<0.001). More tips were correctly positioned in the R group than in the P group (74 vs 93%, P=0.001). Abutment, tip angle to the lateral wall >40°, and disrupted flow stream were comparable. CONCLUSIONS: Catheter tip position was more accurate with a radiological landmark-based technique than with Peres' formula. CLINICAL TRIAL REGISTRATION: Clinical Trial Registry of Korea: https://cris.nih.go.kr/cris/index.jsp KCT0001937.

Sarcopenia is associated with non-alcoholic fatty liver disease in men with type 2 diabetes.

AIMS: Recent epidemiological studies have suggested an association between sarcopenia and non-alcoholic fatty liver disease (NAFLD) in the general population, prompting our investigation into the gender-specific association between sarcopenia and NAFLD in patients with type 2 diabetes mellitus (T2DM). METHODS: In this cross-sectional study, 4210 patients with T2DM were recruited from the Seoul Metabolic Syndrome Cohort. Appendicular skeletal muscle mass (ASM) was estimated from bioimpedance analysis measurements, and the skeletal muscle mass index (SMI) was calculated by dividing the sum of ASM by body weight. Sarcopenia was defined as a gender-specific SMI value>2 standard deviations (SDs) below the mean for healthy young adults. NAFLD was defined as the presence of hepatic steatosis on ultrasonography with no other causes of chronic liver disease. RESULTS: Among the entire study population (mean age: 57.4±10.8 years), 1278 (30.4%) had NAFLD and 1240 (29.5%) had sarcopenia, and the prevalence of NAFLD was significantly higher in those with sarcopenia: 46.2% vs 25.1% (P<0.001) in men; 38.3% vs 25.4% (P<0.001) in women. Sarcopenia was significantly associated with higher risk of NAFLD in men (adjusted odds ratio [OR]: 1.58, 95% confidence interval [CI]: 1.15-2.17), whereas the association was attenuated in women after adjusting for clinical risk factors. CONCLUSION: Sarcopenia is independently associated with NAFLD in men with T2DM, which suggests that sarcopenia may be a risk factor for NAFLD in men with T2DM.

Molecular cloning and functional characterization of a sucrose isomerase (isomaltulose synthase) gene from Enterobacter sp. FMB-1.

AIMS: Isomaltulose (palatinose) is a slowly digestible sucrose isomer that can reduce both the glycemic and insulinemic response to foods. The aim of this study was to clone and express a sucrose isomerase (SIase) gene and characterize the protein that is responsible for the production of isomaltulose in the micro-organism Enterobacter sp. FMB-1. METHODS AND RESULTS: A cosmid clone containing c. 6 kbp region encoding an SIase gene was identified. The 5969-bp chromosomal DNA fragment covering the SIase (esi) gene in Enterobacter sp. FMB-1 was sequenced. Although this DNA fragment contained several open reading frames other than esi, only the presence of esi was sufficient to produce isomaltulose in recombinant Escherichia coli. The esi gene was expressed in E. coli, leading to the characterization of its SIase activity. CONCLUSIONS: The Enterobacter sp. FMB-1 esi gene was successfully cloned and expressed in E. coli. This gene encoded a functional SIase that produced isomaltulose from sucrose. SIGNIFICANCE AND IMPACT OF THE STUDY: This is the first molecular analysis of an SIase gene in an Enterobacter strain. The functional expression of the Enterobacter sp. FMB-1 esi gene in E. coli offers an alternative choice for the industrial production of isomaltulose.

Non-tuberculous Mycobacterium infection after transfer of autologous fat to the face: a rare case.

Autologous fat has long been used as a filler in the face, and has recently gained popularity in plastic surgery with a wound infection rate of 1% - 5%. The incidence of mycobacterial infections has increased over recent decades, which is attributed in part to the increased popularity of these procedures.2 Infections by non-tuberculosis mycobacteria often cause chronic inflammation and progressive infection that may eventually manifest themselves as severe scars, fistulas, and hollows, and irregular facial contours. However, few cases of mycobacterial infection have been reported to have been caused by plastic surgery. We present a rare case of non-tuberculosis mycobacterial infection after transfer of autologous fat to the face.

Clinical characteristics of diabetic ketoacidosis in users and non-users of SGLT2 inhibitors.

AIM: This study investigated the clinical characteristics of diabetic ketoacidosis (DKA) and compared the DKA characteristics between patients treated with and without SGLT2 inhibitors. METHODS: Data were collected from patients aged ≥ 18 years admitted for DKA at nine centres in Korea between September 2014 and April 2017. The electronic medical records of these subjects were retrospectively reviewed. Based on their history of medications taken before admission, subjects were classified as either users or non-users of SGLT2 inhibitors and their clinical characteristics of DKA were compared. RESULTS: During the study, the main subtype of DKA episodes (n = 523) was identified as type 2 diabetes (51%). Average hospitalization duration was 11 days, and average intensive care unit (ICU) time was 2.5 days. The in-hospital mortality rate was 3%, but no users of SGLT2 inhibitors died during DKA treatment. In patients taking SGLT2 inhibitors (n = 15), DKA manifested at 124 days, on average, after starting the inhibitors (range: 7-380 days). Also, SGLT2 inhibitors users had significantly lower plasma glucose levels (413 mg/dL) compared with non-users (554 mg/dL), and longer ICU stays (4 vs. 2 days; P = 0.019). CONCLUSION: In this report of recent data on the clinical features of DKA in Korea, patients using SGLT2 inhibitors needed longer treatment in ICUs compared with non-users and had lower levels of blood glucose, whereas DKA associated with SGLT2 inhibitors was rare.

Relationship between serum testosterone and nocturia in men without benign prostate enlargement.

Recent studies have focused on the relationship between nocturia and serum testosterone because testosterone is thought to be an important factor of prostate growth. However, it remains unclear whether altered serum concentrations of testosterone is associated with an increased risk of nocturia because patients who were taking diuretics or who had a large prostate, which may precipitate nocturia, were not excluded from most previous studies. We analyzed the clinical records of 596 non-benign prostatic enlargement (BPE) male patients to explore the relationship between serum total testosterone and nocturia. All patients were evaluated using a serum prostate-specific antigen (PSA) assay, measurement of serum total testosterone, transrectal ultrasonography, uroflowmetry, and a compilation of the International Prostate Symptom Score (IPSS) and International Index of Erectile Function (IIEF) questionnaires. Nocturia was defined as ≥2 nocturnal voiding episodes. The number of nocturia episodes was assessed using IPSS question 7. To evaluate the effect of serum testosterone on nocturia, multivariate regression analysis was performed including the covariates of age, IPSS, IIEF score, body mass index, PSA, prostate volume, and maximal urine flow rate. Based on multivariate linear analysis, serum testosterone level was not significantly associated with the severity of nocturia. However, with regard to the relationship between prevalence of nocturia and serum testosterone, prevalence of nocturia was significantly positively associated with age (OR = 1.048, p = 0.005), total IPSS (OR = 1.217, p < 0.001), and testosterone level (OR = 1.150, p = 0.041). Therefore, in men without an enlarged prostate, testosterone may play an opposing role in the etiology of nocturia.

Impact of erectile function and age in men with lower urinary tract symptoms on ejaculatory dysfunction and premature ejaculation.

Lower urinary tract symptoms (LUTSs) and ED are clearly correlated, but to date no correlation with ejaculatory dysfunction (EjD) has been identified. Therefore, this study evaluated the impact of erectile function in men with LUTS on EjD and premature ejaculation (PE). Erectile function, PE and EjD of 239 men (mean age, 53.0 ± 10.65 years), International Prostate Symptom Score (IPSS), International Index of Erection Function (IIEF), intravaginal ejaculatory latency time (IELT) and the seven-item Male Sexual Health questionnaire (MSHQ)-EjD were used to compare with the degree of LUTS. Ages were divided into five groups (<40, 40-49, 50-59, 60-69 and >70 years). The IPSS categorized patients into three symptom groups: mild, 1-7; moderate, 8-19; and severe, >19. ED was classified into five categories based on IIEF-EF scores: severe (0-6), moderate (7-12), mild-to-moderate (13-18), mild (19-24) and normal (25-30). The correlations among age, IIEF-EF, IELT and the MSHQ-EjD domain were studied through regression and cross-tabulation analyses. The results revealed that aging significantly affected each item of the MSHQ-EjD (P<0.05). The IIEF-EF domain was also correlated with each question on the MSHQ-EjD (P<0.05). PE (IELT <1 min) increased in incidence as patients got older but was not linked to IIEF-EF (P>0.05). These results indicate that EjD is closely related to age and erectile function, and that PE is closely related to age, although PE is not related to erectile function.

Gene frequencies of eight human platelet-specific antigens in Koreans.

Human platelet-specific antigens (HPAs) are found on platelet membrane glycoproteins and are the target of platelet alloantibodies that mediate platelet destruction in neonatal alloimmune thrombocytopenia (NAIT), post-transfusion purpura (PTP) and refractoriness to platelet transfusion therapy. The biallelic polymorphism of all HPA systems is known to be due to a substitution of a single base pair. This study was performed to investigate the frequency of the HPA genes in Koreans, based on these substitutions. The genotypes of eight HPA systems were determined by polymerase chain reaction using sequence-specific primers (PCR-SSP) for HPA-1, -2, -4, -5, and -8 and restriction fragment length polymorphism (RFLP) for HPA-3, -6, and -7. The gene frequencies obtained from 200 unrelated Koreans were 0.99 and 0.01 for HPA-1a and -1b, 0.92 and 0.08 for HPA-2a and -2b, 0.55 and 0.45 for HPA-3a and -3b, 0.99 and 0.01 for HPA-4a and -4b, 0.98 and 0.02 for HPA-5a and -5b, and 0.98 and 0.02 for HPA-6a and -6b. All the individuals tested were homozygotes for HPA-7a and HPA-8a. It has been reported that the HPA-1b antigen is extremely rare (less than 0.3%) in Oriental populations, but this study suggests that the frequency of this antigen in Koreans (2.0%) is higher than in Japanese and Chinese populations.