Prevalence Of Elevated Alanine Aminotransferase Research Articles

High Prevalence of Elevated Alanine Aminotransferase in American Indian Children Seen in a Pediatric Weight Management Clinic.

Elevated alanine aminotransferase (ALT) can indicate risk of metabolic dysfunction-associated steatotic liver disease. However, there is little data about the prevalence of elevated ALT in American Indian (AI) children. Baseline data from children attending the pediatric weight management clinic were used to describe the prevalence of elevated ALT, stratified by race and ethnicity. The prevalence of elevated ALT was higher among children who were male, were older, had higher body mass index Z scores, and were non-Hispanic and AI. In this clinic, AI children with overweight and obesity had a disproportionately high prevalence of elevated ALT; root causes of this disparity should be identified.

Prevalence of Elevated ALT in Adolescents in the US 2011-2018.

The objective of this study is to characterize suspected nonalcoholic fatty liver disease (NAFLD) using elevated alanine aminotransferase (ALT) in a diverse and nationally representative cohort of adolescents and to characterize higher ALT elevation in adolescents with obesity. Data from the National Health and Nutrition Examination Survey 2011-2018 were analyzed for adolescents 12-19 years. Participants with causes for elevated ALT other than NAFLD were excluded. Race and ethnicity, sex, body mass index (BMI), and ALT were examined. Elevated ALT was defined as >22 U/L (females) and >26 U/L (males) using the biologic upper normal limit (ULN). Elevated ALT thresholds up to 2X-ULN were examined among adolescents with obesity. Multivariable logistic regression was used to determine the association of race/ethnicity and elevated ALT, adjusting for age, sex, and BMI. Prevalence of elevated ALT in adolescents was 16.5% overall and 39.5% among those with obesity. For White, Hispanic, and Asian adolescents, prevalence was 15.8%, 21.8%, and 16.5% overall, 12.8%, 17.7%, and 27.0% in those with overweight, and 43.0%, 43.5%, and 43.1% in those with obesity, respectively. Prevalence was much lower in Black adolescents (10.7% overall, 8.4% for overweight, 20.7% for obesity). Prevalence of ALT at 2X-ULN was 6.6% in adolescents with obesity. Hispanic ethnicity, age, male sex, and higher BMI were independent predictors of elevated ALT. Prevalence of elevated ALT in U.S. adolescents is high, affecting 1 in 6 adolescents during 2011-2018. The risk is highest in Hispanic adolescents. Asian adolescents with elevated BMI may comprise an emerging risk group for elevated ALT.

Is elevated ALT associated with lifestyle risk factors? A population-based survey.

Given the high prevalence of non-alcoholic fatty liver disease (NAFLD) and the role of Alanine aminotransferase (ALT) in diagnosing liver injury along with the increasing prevalence of lifestyle risk factors, we aimed to evaluate the association between serum ALT level and lifestyle risk factors in a population-based survey. This was a population-based study conducted in rural and urban areas of Iran in 2016. Cluster sampling method was applied to enroll a total of 31,050 participants aged ≥ 18. Demographic data, anthropometric measures, and laboratory samples were gathered. Multivariate logistic regression analyses were performed using three different cut-off levels for elevated ALT to assess the relationship between elevated ALT and lifestyle risk factors. The prevalence of elevated ALT was significantly higher in men with elevated body mass index (BMI), waist-to-hip ratio (WTH), hip circumference, and salt consumption, likewise, in women with higher BMI and WTH. In the multivariate logistic model adjusted for age and sex, high WTH (adjusted odds ratio: 1.73; 95% CI 1.52-1.96), BMI > 25 (1.51; 95% CI 1.29-1.76), hip circumference (1.26; 95% CI 1-1.58), and current smoking (0.67; 95% CI 0.56-0.8) were associated with elevated ALT levels using American cut-off (ALT > 33U/L for male and ALT > 25U/L for female). Only physical measurements (BMI, WTH) but not lifestyle risk factors were related to the increased ALT regardless of the selected cut-offs. As elevated ALT was associated with several lifestyle risk factors, stewardship programs should be established to modify lifestyle risk factors, such as abdominal obesity and physical inactivity. The online version contains supplementary material available at 10.1007/s40200-022-01137-6.

Prevalence of elevated alanine aminotransferase (ALT) in pregnancy: A cross-sectional labor and delivery-based assessment.

Since liver tests are not routinely checked in pregnancy, the prevalence of abnormal liver tests and liver-related abnormalities in pregnancy in a US-based population is not known. We sought to determine the prevalence of abnormal alanine aminotransferase (ALT) among pregnant Individuals who present to labor and delivery for evaluation and to evaluate prevalence of underlying diagnosed liver conditions. Prospective study evaluating liver tests in consecutive samples obtained on the labor and delivery unit. Patient characteristics were compared between those with and without abnormal ALT and those with and without abnormal ALT without a liver-related diagnosis made in clinical practice, using t tests for continuous measures and χ2 or Fisher’s exact tests as appropriate for categorical measures. Logistic regression was utilized to identify factors associated with abnormal ALT in this subcohort to determine predictors of abnormal ALT in those without a known liver-related diagnosis. We collected 1024 laboratory specimens from 996 patients. Of these patients, 131 of 996 (13.2%) had elevated ALT ≥25 IU/L; 20 (2%) had ALT ≥50, 6 (0.6%) had ALT ≥125 and 3 (0.3%) had ALT ≥250. 61/131 (46.6%) of patients with ALT ≥25 IU/L had not had LTs checked during routine pregnancy care. 20 (15%) of individuals with abnormal LT had preeclampsia; 5 (4%) had cholestasis of pregnancy; 1 (0.8%) had hepatitis C; there were no other chronic liver diseases diagnosed. There were no significant demographic or clinical differences between those with and without ALT ≥25, whether liver disease diagnosis was made or not. We identified an over 10% prevalence of abnormal LTs in consecutive pregnant individuals who presented to L&D, most of whom did not have a liver-related condition diagnosed in clinical practice. Among those with liver-related diagnoses, PE and ICP were the most common among individuals with ALT≥25 IU/mL, with chronic liver disease rarely diagnosed. Further evaluation of the role of ALT testing as part of routine prenatal care is needed, particularly in establishing a baseline prevalence of liver test abnormalities in pregnancy and independent association with pregnancy outcomes.

Prevalence and risk factors of metabolic associated fatty liver disease among people living with HIV in China.

The new definition for metabolic associated fatty liver disease (MAFLD), formerly named non-alcoholic fatty liver disease (NAFLD), would undoubtedly have significant influence on diagnosis, epidemiology, and new drug research. We investigated the prevalence and risk factors of MAFLD among people living with HIV (PLWH). In this cross-sectional study, transient elastography was performed in PLWH without significant alcohol intake and hepatitis B virus and hepatitis C virus infection. NAFLD was diagnosed as controlled attenuation parameter (CAP)≥248dB/m by transient elastography, and MAFLD was defined according to the 2020 international consensus. Advanced fibrosis was defined as liver stiffness measurement (LSM)≥10kPa. Among the 361 PLWH enrolled, the prevalence of NAFLD and MAFLD were 37.67% and 34.90%, respectively. Compared with the non-MAFLD group, the prevalence of elevated alanine aminotransferase (ALT) level (44.44% vs 16.17%, P<0.001) and advanced fibrosis (19.05% vs 2.55%, P<0.001) were significantly higher in the MAFLD group. A positive correlation between LSM and CAP values was found in the MAFLD group (rs =0.350, P<0.001) but not in the non-MAFLD group. In multivariate analysis, independent risk predictors for MAFLD were higher ALT level (odds ratio [OR] 1.015, 95% confidence interval [CI] 1.003-1.028, P=0.018), higher uric acid (OR 1.005, 95% CI 1.002-1.009, P=0.003), higher total cholesterol (OR 1.406, 95% CI 1.029-1.921, P=0.032), and greater waist-height ratio (OR 1.291, 95% CI 1.196-1.393, P<0.001). A third of PLWH had MAFLD, which was highly accordant with the prevalence of NAFLD. Routine screening for MAFLD is necessary in PLWH.

Factors associated with elevated alanine aminotransferase in employees of a German chemical company: results of a large cross-sectional study

BackgroundWe aimed to determine the prevalence of elevated alanine aminotransferase (eALT) in employees of a German chemical company, and analyze its association with sociodemographic, work- and lifestyle-related factors.MethodsThe cross-sectional study is based on data surveyed from occupational health check-ups between 2013 and 2018 at the site clinic of a chemical company based in Ludwigshafen, Germany. We used logistic regression analyses to assess the association between sociodemographic, work- and lifestyle-related characteristics and eALT. Quantile regression technique was applied to investigate if associations vary across different quantiles of the ALT distribution.ResultsParticipants (n = 15,348) were predominantly male (78.3%) with a mean age of 42.2 years (SD 10.7). The prevalence of eALT was 18.5% (21.6% in men/7.2% in women) with a geometric mean of 28.9 U/L (32.8 U/L in men/18.5 U/L in women). In the multivariable logistic regression model, odds of eALT were significantly higher for males (OR 2.61; 95%-CI 2.24–3.05), manual workers (OR 1.23; 95%-CI 1.06–1.43), overweight (OR 2.66; 95%-CI 2.36–3.00) or obese respondents (e.g. OR 7.88; 95%-CI 5.75–10.80 for obesity class III), employees who consume any number of alcoholic drinks/week (e.g. OR 1.32; 95%-CI 1.16–1.49 for ≥ 3 drinks per week) and diabetics (OR 1.47; 95%-CI 1.22–1.78). Additionally, season of participation was significantly associated with eALT, with odds being higher for participation in spring, fall or winter, as compared to summer. A significant interaction between age and gender (pInteraction < 0.001) was found, showing approximately a u-shaped age/ALT relationship in women and an inversely u-shaped relationship in men. Quantile regression showed an increasing positive effect of male gender, overweight/obesity, and for diabetics on ALT level when moving from the lowest (q0.1) to the highest (q0.9) considered quantile. Additionally, from the lowest to the highest quantile an increasing negative effect on ALT for older age was observed.ConclusionsPrevalence of eALT in our sample of employees can be considered as high, with almost one in five participants affected. Identification of risk groups allows the implementation of targeted preventive measures in order to avoid transition to severe morbidity.

Is liver involvement overestimated in COVID-19 patients? A meta-analysis.

Background: Considering transaminase more than the upper limit of normal value as liver injury might overestimate the prevalence of liver involvement in COVID-19 patients. No meta-analysis has explored the impact of varied definitions of liver injury on the reported prevalence of liver injury. Moreover, few studies reported the extent of hypertransaminasemia stratified by COVID-19 disease severity.Methods: A literature search was conducted using PubMed and Embase. The pooled prevalence of liver injury and hypertransaminasemia was estimated.Results: In total, 60 studies were included. The overall prevalence of liver injury was 25%. Compared to subgroups with the non-strict definition of liver injury (33%) and subgroups without giving detailed definition (26%), the subgroup with a strict definition had a much lower prevalence of liver injury (9%). The overall prevalence of alanine aminotransferase (ALT) and aspartate aminotransferase (AST) elevation was 19% and 22%. The prevalence of elevated ALT and AST were significantly higher in severe COVID-19 cases compare to non-severe cases (31% vs 16% and 44% vs 11%). In critically ill and fatal cases, no difference was found in the prevalence of elevated ALT (24% vs 30%) or AST (54% vs 49%). Sensitivity analyses indicated that the adjusted prevalence of ALT elevation, AST elevation, and liver injury decreased to 14%, 7%, and 12%.Conclusion: The overall prevalence of liver injury and hypertransaminasemia in COVID-19 patients might be overestimated. Only a small fraction of COVID-19 patients have clinically significant liver injury. The prevalence of hypertransaminasemia was significantly higher in severe COVID-19 cases compare to non-severe cases. Hence, in severe COVID-19 patients, more attention should be paid to liver function tests.

Prevalence of Elevated Alanine Aminotransferase by Diagnostic Criterion, Age, and Gender among Adolescents.

Background Serum alanine aminotransferase (ALT) activity was measured not only to detect liver disease, but also to monitor overall health. The purpose of this study was to obtain the prevalence of elevated ALT levels among adolescents. Methods In a school-based cross-sectional study, a representative sample was analyzed from 9 middle and high schools in Shenzhen, China, during 2017 to 2018. Elevated ALT was defined as diagnostic criterion I (>30 U/L for boys and >19 U/L for girls) and diagnostic criterion II (>40 U/L). Results From the adolescent population, a total of 7281 students (boys, 4014, and girls, 3267) aged from 10 to 17 years were collected. The prevalence of elevated ALT was 7.11% (6.88% for boys and 7.41% for girls) by criterion I and 2.72% (3.96% for boys and 1.19% for girls) by criterion II. Based on the Shenzhen census and Chinese national census population, the adjusted prevalence of elevated ALT was 7.65% (boys 7.19% and girls 8.21%) and 6.79% (boys 6.07% and girls 7.56%) by criterion I and 2.85% (boys 4.20% and girls 1.16%) and 2.43% (boys 3.49% and girls 1.29%) by criterion II. For age, the overall trends were increasing progressively, regardless of the use of diagnostic criteria for an elevated ALT activity. Conclusions This study supplements the gap that the prevalence of elevated ALT levels differed in gender, age, and criteria among adolescents of Shenzhen. We should take the prevalence as a predictor and continue to play a warning and preventive role in preparation for further intervention.

Low serum vitamin D is independently associated with unexplained elevated ALT only among non-obese men in the general population

Introduction and ObjectivesThere are inconsistent findings on the association between human non-alcoholic fatty liver disease (NAFLD) and vitamin D, perhaps due to insufficient specificity for gender and obesity status. We aimed to assess whether serum levels of 25-hydroxyvitamin D are associated with unexplained elevated alanine aminotransferase (ALT) in general population across gender and body mass index (BMI) levels. Materials and methodsA cross-sectional analysis of a population-based cohort with a nationwide-distribution using electronic medical database. The population consisted of individuals aged 20–60 years who underwent blood tests for ALT and vitamin D. ResultsA total of 82,553 subjects were included (32.5% men, mean age 43.91±10.15 years). The prevalence of elevated ALT was higher among men and women with vitamin D insufficiency or deficiency, but in multivariate analysis, adjusting for: age, BMI, serum levels of glucose, total cholesterol, triglycerides, statin use and season, only the association among men remained significant for the vitamin D deficiency category (OR=1.16, 95%CI 1.04–1.29, P=0.010). Stratification by BMI revealed that only among normal weight and overweight men vitamin D deficiency was associated with elevated ALT (OR=1.27, 95%CI 1.01–1.59, P=0.041 and OR=1.27, 95%CI 1.08–1.50, P=0.003, respectively). No independent association was shown among women at all BMI categories. ConclusionsIn a “real-life” general population, the association between vitamin D deficiency and unexplained elevated ALT is specific for non-obese men. The clinical significance of vitamin D for human NAFLD should be further elucidated with attention for a modifying effect of gender and adiposity.

Prevalence of abnormal serum liver enzymes in patients with type 2 diabetes mellitus: a cross-sectional study from China

ABSTRACTObjectives: This cross-sectional study aimed to determine the prevalence of elevated alanine aminotransferase (ALT) and aspartate aminotransferase (AST) in Chinese type 2 diabetic patients and identify contributing risk factors.Methods: This cross-sectional study was conducted in rural areas of China, and 1,198 type 2 diabetic patients with complete data were recruited. Elevated ALT and AST levels were defined as >40 U/L. Prevalence of abnormal liver enzymes was analyzed and multivariable analysis was used to identify independent risk factors.Results: 10.3% and 6.1% diabetic patients had elevated ALT and elevated AST, respectively. The prevalence of elevated liver enzymes was gender-related; it was 13.8% in men and 7.5% in women for elevated ALT, and 7.4% in men and 3.1% in women for elevated AST. High triglyceride was positively associated with both elevated ALT (OR 1.80, 95% CI 1.08–3.01, p = 0.024) and elevated AST (OR 2.24, 95%CI 1.08–4.65, p = 0.031), while taking anti-diabetes medicine was inversely related to both elevated ALT (OR 0.48, 95% CI 0.29–0.80, p = 0.005) and elevated AST (OR 0.37, 95% CI 0.17–0.82, p = 0.014). The risk of elevated ALT in diabetic patients increased with the presence of obesity (OR 2.54, 95% CI 1.07–6.01, p = 0.034), and was lower in women (OR 0.37, 95% CI 0.19–0.72, p = 0.003). Hypertension (OR 4.33, 95% CI 1.41–13.30, p = 0.011), current drinking status (OR 2.90, 95% CI 1.21–6.96, p = 0.017) and national minority (OR 3.26, 95%CI 1.31–8.12, p = 0.011) were risk factors for elevated AST.Conclusion: A relatively high prevalence of abnormal serum liver enzymes in diabetic patients was demonstrated in China, especially in males. More attention should be paid to preventing liver injuries in diabetic patients.

Association between Serum Uric Acid and Elevated Alanine Aminotransferase in the General Population.

Background: Both the serum uric acid (SUA) level and elevated alanine aminotransferase (ALT) are related to metabolic syndrome. However, the association between SUA and elevated ALT has not been elucidated in the general population. The objective of this study was to investigate the association between SUA and elevated ALT in the general population of China; Methods: A total of 11,572 adults (≥35 years of age) participated in this survey. Elevated ALT was defined as >40 U/L. SUA ≥ 7.0 mg/dL in males or ≥6.0 mg/dL in females was defined as hyperuricemia. SUA within the reference range was divided into quartiles, and its associations with elevated ALT were evaluated by logistic regressions; Results: A total of 7.4% participants had elevated ALT. The prevalence of hyperuricemia was 14.9% in males and 7.3% in females. There was a significantly positive dose-response association between SUA levels and the prevalence of elevated ALT. After adjusting for potential confounders, a positive relationship for elevated ALT was observed in subjects with hyperuricemia (odds ratio [OR]: 2.032, 95% confidence interval [CI]: 1.443–2.861 for men; OR: 2.045, 95% CI: 1.221–3.425 for women, both p < 0.05). Within the reference range, the association between SUA and elevated ALT persisted in the fourth quartile (OR: 1.467, 95% CI: 1.063–2.025 for men; OR: 1.721, 95% CI: 1.146–2.585 for women, both p < 0.05); Conclusions: Our results indicated that an increased SUA level, even within the reference range, was independently associated with elevated ALT in Chinese adults.

Prevalence and factors of elevated alanine aminotransferase in central Taiwan - a retrospective study.

BackgroundThe aims of this study were to assess the prevalence of elevated alanine aminotransferase (ALT) and explore its related factors in Central Taiwan.MethodsThe study employed a retrospective design. The study selected a sample of 5,550 subjects between the years 2000 to 2004. The indivduals undergoing health examinations in a medical center in Central Taiwan were enrolled as subjects for this research. The patients’ demographics, smoking and drinking habits, laboratory findings, and abdominal ultrasound results were collected and analyzed. Correlations between variables were analyzed using SPSS/ PC Windows for frequency distribution, t-test, Chi-square test, and multivariate logistic regression.ResultsThere were 3103 men (55.9%) and 2447 women (44.1%). The mean age was 49.4 ± 12.3 years (age range of 20-87). The overall prevalence of elevated ALT was 17.1%, with a significant gender difference (23.2% in men vs. 9.4% in women, P < .0001). The multivariate logistic regression analysis showed that the factors significantly related to elevated ALT were central obesity, hypertriglyceridemia, and anti-HCV positive in men and women.ConclusionsCentral obesity, hypertriglyceridemia, and anti-HCV positive are factors predominantly related to elevated ALT in men and women.

Longitudinal association of obesity, metabolic syndrome and diabetes with risk of elevated aminotransferase levels in a cohort of Mexican health workers.

In Mexico, chronic liver disease have been increasingly found along with the rapidly growing prevalence of obesity, diabetes and metabolic syndrome (MS). We aimed to investigate the longitudinal association between these three factors and risk of elevated alanine aminotransferase (ALT) levels (>40U/L), a marker for liver damage, in a cohort of Mexican adults. Data were obtained from two separate waves of the Mexican Health Worker Cohort Study: Wave 1 (2004-2006) and Wave 2 (2011-2013). Unconditional logistic regression models were employed to determine the cross-sectional and longitudinal association between these risk factors and elevated ALT levels. The prevalence of elevated ALT was significantly higher among men, individuals aged under 60years, those who were overweight or obese, diabetic, with MS or heavy/binge drinkers. The longitudinal results indicated that weight gain between waves that resulted in a change in body mass index, along with remaining overweight or obese, were significantly associated with an increased risk of elevated ALT levels. A significantly increased risk of developing elevated ALT was also observed among those who acquired diabetes or MS from Wave 1 to Wave 2. Weight gain and acquiring diabetes or MS are associated with a significant risk of having elevated ALT. These results, within the context of the rapid increase in global obesity rates, call urgently for programs to help to prevent chronic liver disease.

Coffee consumption is associated with lower serum aminotransferases in the general Korean population and in those at high risk for hepatic disease.

The favourable effects of coffee on liver enzymes have been reported worldwide. This study investigated the association between coffee consumption and serum aminotransferase concentration in Korean adults. Data were obtained from the fourth and fifth Korea National Health and Nutrition Examination Surveys. Elevated alanine aminotransferase (ALT) and aspartate aminotransferase (AST) concentration were defined as >30 IU/L for men and >19 IU/L for women. The risk of elevated ALT and AST according to general characteristics and frequency of coffee consumption were tested by chi-square tests and multiple logistic regression analyses. The prevalence of elevated ALT was 27.4%, 27.8%, and 26.9% in subjects who drank <1, 1, and >=2 times/day, respectively. The proportions of individuals with elevated AST were 32.5%, 33.1%, and 26.7% in subjects who drank <1, 1, and >=2 times/day, respectively. The aORs for elevated ALT and AST were significantly lower in subjects who drank >=2 times of coffee/day than in those who drank <1 time/day (ALT: aOR=0.86, 95% CI=0.79-0.94; AST: aOR=0.83, 95% CI=0.76-0.91). In subgroup analysis, consumption of >=2 times/day was associated with lower ORs for elevated ALT in the high-risk group overall and in the viral hepatitis and obesity subgroups, respectively. In sensitivity analysis, reduced frequency of coffee consumption was associated with an increased risk for elevated liver enzymes, although an association between coffee consumption and elevated ALT was not observed in women or current smokers. Higher coffee consumption was associated with lower risk of elevated aminotransferase concentration in Korean adults.

Change of components of the metabolic syndrome in a workers' health checkup after five years--relation with elevated liver enzymes, gene polymorphisms for ALDH 2, beta3-AR and lifestyle.

We previously reported that the prevalence of elevated alanine aminotransferase (ALT) increases with accumulation of metabolic syndrome components, and a greater degree of involvement of aldehyde dehydrogenase 2 (ALDH2) than beta3-adrenergic receptor gene (beta3-AR) polymorphisms. The present study was designed to clarify the effect of aging, lifestyle and the two gene polymorphisms on the relationship between 4 components of the metabolic syndrome (obesity, hypertension, dyslipidemia and impaired glucose tolerance) and elevated ALT values in a subset of 73 out of 148 male workers who were 35 years of age in the baseline study and 40 years old in the present study. Study subjects completed questionnaires about drinking and smoking habits, and underwent urinalysis, physical examination and peripheral blood tests, blood chemistry, electrocardiogram and chest X-rays each year as required by Japanese law. Information from the questionnaires and physical examinations, including liver function tests, were compared with previously reported ALDH2 and beta3-AR genotypes for the 73 workers. Of the 73 workers studied, 14 (19%) demonstrated decrease in metabolic syndrome components, 39 (53%) demonstrated no change, and 20 (27%) demonstrated an increase. Ten workers (14%) showed liver dysfunction at age 35 and 20 workers (27%) at age 40. Fourteen workers were newly diagnosed as having liver dysfunction at their 40-year checkup, thus being associated with the BMI and an active ALDH2 genotype. Accumulation of components of the metabolic syndrome were associated with the presence of liver dysfunction at 35 years. In conclusion, these findings indicate that ALDH2 genotyping as well as lifestyle habits may be important factors in causing metabolic syndrome with liver dysfunction.

Safety Profile of High-Dose Statin Therapy in Geriatric Patients with Stroke

Use of high-dose statin therapy (HDST) in patients with stroke became standard clinical practice after the Stroke Prevention by Aggressive Reduction in Cholesterol Levels (SPARCL) study, in which the mean age of the study population was approximately 63 years. Little data are available on the adverse effects of statins when used in high doses in adults older than 65 years. The objective of this study was to assess the magnitude of adverse effects of HDST in geriatric patients. This single-center, retrospective, case-control study was conducted at Upstate Medical University, Syracuse, New York. All patients older than 65 years admitted between 2008 and 2011 to the hospital's Upstate Stroke Center with acute stroke were eligible. Electronic medical records of 200 eligible patients were reviewed to collect demographic, clinical, and laboratory data. Patients on HDST (cases) were compared with those on low doses (controls) using the χ, Fisher exact (two-sided), and Student t tests. One hundred cases (mean age 80.5 ± 7.7 years) were compared with 100 controls (mean age 78.9 ± 6.4 years). Sixty-seven percent were taking simvastatin. Ninety percent of the cases compared with 81% of the controls had ischemic stroke. The prevalence of elevated alanine aminotransferase (13%) and myositis (4%) was significantly higher in the cases than in the controls. Fourteen percent of the cases reported myalgias, 9% had nausea, and 6% had diarrhea. Seventy-three cases had low-density lipoprotein levels <100 mg% and 41% of the cases had mean glycated hemoglobin levels ≥ 6.5%. The use of HDST in older adult patients with acute stroke is associated with a significantly increased burden of liver enzyme elevation and myalgias.

Hyperandrogenemia Is Independently Associated with Elevated Alanine Aminotransferase Activity in Young Women with Polycystic Ovary Syndrome

Women with polycystic ovary syndrome (PCOS) have been implicated to have higher levels of alanine aminotransferase (ALT) because of the high prevalence of obesity. Our aim was to investigate the relationship between elevated ALT and aspartate aminotransferase (AST) activity and characteristic hyperandrogenism in women with PCOS. We conducted a cross-sectional case-control study in a reproductive endocrinology clinic and voluntary annual medical health check-up program of the health management center in a tertiary medical center. A total of 279 women with PCOS and 279 age-frequency-matched healthy women were studied. There were no interventions. All subjects underwent anthropometric measurement, clinical history recorded by questionnaires, and biochemical tests after an overnight fast. The prevalence of elevated ALT and AST levels was significantly higher in women with PCOS than healthy control subjects. Multivariate regression analysis for women revealed that the presence of PCOS was significantly associated with elevated ALT but not AST after adjustment for age, obesity, and dyslipidemia. The level of androgenicity represented by free androgen index in women with PCOS was significantly related to elevated ALT and AST levels in multivariate regression models. Women with PCOS who had the highest quartile of free androgen index level had the highest risk of elevated ALT level after adjustment for age, obesity, insulin resistance, and dyslipidemia. The risk of elevated ALT level is significantly higher in women with PCOS than those without, independent of obesity. The elevated ALT levels in women with PCOS were associated with the increased androgen levels, independent of obesity, insulin resistance, and dyslipidemia.

Non‐alcoholic fatty liver disease prevalence among school‐aged children and adolescents in Iran and its association with biochemical and anthropometric measures

To investigate the prevalence of non-alcoholic fatty liver disease (NAFLD) as well as the determination of associated metabolic abnormalities in Iranian school-aged children and adolescents. Data were obtained from 966 children aged 7-18 years in Iran by a cross-sectional survey in 2007. These children were subjected to a complete anthropometric and laboratory measurement and abdominal ultrasonography for liver echogenicity and size. A questionnaire was also used to obtain information on demographical and medical history, dietary habit, alcohol consumption and cigarette smoking. Fatty liver was diagnosed by ultrasound in 7.1% of children. The prevalence of elevated alanine aminotransferase (ALT) was 1.8%. NAFLD was significantly more common in the older group (12.5 against 3.5%, P<0.0001). The odds ratios (OR) (95% confidence interval) for NAFLD in children having elevated ALT, high fasting insulin, total cholesterol, low density lipoprotein (LDL) cholesterol, triglyceride and insulin resistance (IR) were 10.9 (3.9-30.4), 2.8 (1.6-4.8), 2.8 (1.5-5.1), 2.8 (1.5-5.3), 2.5 (1.3-4.8) and 4.4 (1.6-12.3) respectively. Therefore, NAFLD was significantly associated with increasing age, ALT, fasting insulin, total cholesterol, LDL cholesterol, triglyceride and IR. In multiple logistic regression analysis, ALT (OR=1.2; P<0.01), total cholesterol (OR=1.01; P<0.01) and waist circumference (OR=1.14, P<0.0001) were independent metabolic factors predictive of NAFLD after adjustment for other variables. There was a strong relationship between NAFLD and the abnormal metabolic variables in children. It will be very useful if children are assessed for variables such as waist circumference, fasting blood sugar, fasting insulin and serum lipid profile in order to screen those susceptible to NAFLD.

Prevalence of Elevated Alanine Aminotransferase Among US Adolescents and Associated Factors: NHANES 1999–2004

Nonalcoholic fatty liver disease (NAFLD) is a common cause of liver disease in children and adolescents. The majority of studies of NAFLD in children have been in select populations of the clinically obese. Study aims were to estimate the prevalence of elevated alanine aminotransferase (ALT, as a marker of NAFLD) in a general contemporary adolescent population and to identify leading risk factors for ALT elevation (>30 U/L). We analyzed data of adolescent participants (aged 12-19 years; N = 5586) in the National Health and Nutrition Examination Survey 1999-2004, a representative sample of the civilian noninstitutionalized US population. The prevalence of elevated ALT levels (>30 U/L) was 7.4% among white adolescents, 11.5% among Mexican American adolescents, and 6.0% among black adolescents. Elevated ALT levels were prevalent in 12.4% of male subjects compared with 3.5% of female subjects. Multivariable associations with elevated ALT levels were found for sex (odds ratio [OR] male vs female, 7.7; 95% confidence interval [CI], 3.9-15.1), ethnicity (OR black vs white, 0.6; 95% CI, 0.3-1.3; OR Mexican American vs white, 1.6; 95% CI, 1.0-2.6), waist circumference (OR per 1 SD, 1.4; 95% CI, 1.0-2.0), and fasting insulin level (OR per 1 SD, 1.6; 95% CI, 1.2-2.1). Age, C-reactive protein levels, and triglyceride levels were also positively and socioeconomic position inversely associated with elevated ALT levels. The magnitude of associations were similar across ethnic groups. ALT level is associated with waist circumference and insulin resistance even in a young population. These characteristics could be utilized to identify adolescents who may benefit from screening for NAFLD, offering an opportunity to prevent disease progression at an early age.

Prevalence and etiology of elevated serum alanine aminotransferase level in an adult population in Taiwan

The prevalence and etiologies of elevated alanine aminotransferase (ALT) have geographic variations and they are rarely reported in Taiwan. Through a population-based screening study, the prevalence and etiologies of elevated ALT in an adult population of Taiwan were assessed. A cross-sectional community study in a rural village of Taiwan was conducted in 3260 Chinese adults (age >or=18 years) undergoing ultrasonography (US), blood tests, and interviews with a structured questionnaire. The diagnostic criteria of non-alcoholic fatty liver disease (NAFLD) included alcohol intake <20 g/week for women or <30 g/week for men, negative hepatitis B virus (HBV) and hepatitis C virus (HCV) infections, no known etiologies of liver disease, and US consistent with fatty liver. The prevalence of elevated ALT was 11.4% (372/3260). The probable cause of this elevation was excess alcohol consumption in 0.8%, HBV in 28.5%, HCV in 13.2%, both HBV and HCV in 2.2%, NAFLD in 33.6%, and unexplained cause in 21.8%. The etiologic distribution of elevated ALT was similar in both genders, although elevation was more common in men compared to women (17.3%vs 6.1%, P < 0.05). The prevalence of elevated ALT in NAFLD was 18.1% (125/691), and the positive predictive value was 33.6% (125/372). The development of NAFLD was related to increasing age (age between 40 years and 64 years, odds ratio [OR] 1.59, 95% confidence interval [CI]: 1.25-2.01; age >or= 65 years, OR 1.46, 95%CI: 1.08-1.96), fasting plasma glucose (FPG) >or= 126 mg/dL (OR 1.54, 95%CI: 1.11-2.14), body mass index (BMI) >or= 25 kg/m(2) (OR 5.01, 95%CI: 4.13-6.26), triglyceridemia >or= 150 mg/dL (OR 1.96, 95%CI: 1.58-2.42), and hyperuricemia (OR 1.50, 95%CI: 1.22-1.84). Elevated ALT was related to male gender, BMI >or= 25 kg/m(2), and triglyceridemia >or= 150 mg/dL in subjects without known etiologies of liver disease (all P < 0.05). Non-alcoholic fatty liver disease appears to be the commonest cause of elevated ALT and presumed liver injury in Taiwan. The development of NAFLD is closely associated with many metabolic disorders. Metabolic disorders are also related to elevated ALT in subjects without known etiologies of liver disease.