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Biomedical subjects

Alexandra Kautzky-Willer

Publications and source records attributed to Alexandra Kautzky-Willer.

At least 19 recordsLinked to original sources

Vitamin D Deficiency During Pregnancy Is Associated With Greater LDL-C Increase, Elevated β-Hydroxybutyrate and Altered Neonatal Metabolic Markers-A Secondary, Pooled Analysis of the Randomized, Controlled Vitamin D and Lifestyle for Gestational Diabetes Prevention Trial (DALI).

INTRODUCTION: Vitamin D (vitD) plays a role in metabolic regulation, including lipid metabolism and insulin sensitivity. During pregnancy, profound physiological changes in lipid handling and ketogenesis occur to support fetal development. However, the extent to which maternal vitamin D status influences these metabolic adaptations and fetal metabolic markers remains unclear. METHODS: In this secondary analysis, we examined lipid distribution throughout pregnancy-from before 20&#x2009;weeks' gestation to delivery-in women with overweight or obesity, stratified by vitamin D status (deficiency, insufficiency, or sufficiency), assessing both maternal and cord blood. Main inclusion criteria were: age&#x2009;>&#x2009;=18&#x2009;years, singleton pregnancy, <&#x2009;20&#x2009;weeks' gestation, BMI &#x2265;&#x2009;29&#x2009;kg/m2. Women with GDM <&#x2009;20&#x2009;weeks' gestation were excluded. In total, 962 pregnant women were divided into vitD deficient (<&#x2009;30&#x2009;nmol/L, n&#x2009;=&#x2009;102), insufficient (30-50&#x2009;nmol/L, n&#x2009;=&#x2009;222) and sufficient (>&#x2009;50&#x2009;nmol/L, n&#x2009;=&#x2009;638) groups. VitD levels and lipid concentrations were assessed at <&#x2009;20, 24-28 and 35-37&#x2009;weeks' gestation and in cord blood. RESULTS: Compared with vitD sufficient women, women with vitD deficiency had significantly larger increases in LDL-C throughout pregnancy and &#xdf;-OH-butyrate at 24-28&#x2009;weeks' gestation, in adjusted analysis. VitD in cord blood was highest in offspring of mothers with vitD sufficiency. In cord blood, significantly higher &#xdf;-OH-butyrate was observed with vitD deficiency; lipid concentrations were similar between groups. CONCLUSIONS: Early vitamin D deficiency before 20&#x2009;weeks of gestation was associated with altered metabolic trajectories during pregnancy, including greater increases in LDL cholesterol and ketone body concentrations in women with overweight or obesity, as well as higher cord blood ketone levels in their offspring. These findings suggest that early maternal vitamin D status may influence maternal and fetal metabolic adaptations, although causal relationships and clinical implications require further investigation. TRIAL REGISTRATION: Trial registered at ISRCTN registry (https://doi.org/10.1186/ISRCTN70595832) trial number ISRCTN70595832. Registration date 02/12/2011.

Humans↗

Improved usability of the minimal model of insulin sensitivity based on an automated approach and genetic algorithms for parameter estimation.

Minimal model analysis of glucose and insulin data from an IVGTT (intravenous glucose tolerance test) is widely used to estimate insulin sensitivity; however, the use of the model often requires intervention by a trained operator and some problems can occur in the estimation of model parameters. In the present study, a new method for minimal model analysis, termed GAMMOD, was developed based on genetic algorithms for the estimation of model parameters. Such an algorithm does not require the fixing of initial values for the parameters (that may lead to unreliable estimates). Our method also implements an automated weighting scheme not requiring manual intervention of the operator, thus improving the usability of the model. We studied a group of 170 women with a history of previous gestational diabetes. Results obtained by GAMMOD were compared with those obtained by MINMOD (a traditional gradient-based algorithm for minimal model analysis). Insulin sensitivity by GAMMOD was (3.86+/-0.19) compared with (4.33+/-0.20) x 10(-4) micro-units.ml(-1) x min(-1) by MINMOD; glucose effectiveness was 0.0236+/-0.0005 compared with 0.0229+/-0.0005 min(-1) respectively. The difference in the estimation by the two methods was within the precision expected for such metabolic parameters and is probably of no clinical relevance. Moreover, both the coefficient of variation of the estimated parameters and the error of fit were generally lower in GAMMOD, despite the fact that it does not require manual intervention. In conclusion, the GAMMOD approach for parameter estimation in the minimal model provides a reliable estimation of the model parameters and improves the usability of the model, thus facilitating its further use and application in a clinical context.

Adult↗

Insulinogenic indices from insulin and C-peptide: comparison of beta-cell function from OGTT and IVGTT.

A frequently used index of beta-cell function from the OGTT is the insulinogenic index, IGI. However, there is still some controversy about its validity. In a group of 145 women with different degrees of glucose tolerance, we compared IGI to the corresponding index with C-peptide, DeltaCP(30)/DeltaG(30), which better describes beta-cell function. We also validated both indices with measurements of beta-cell function derived from IVGTT. IGI strongly correlated (R = 0.82, P < 0.0001) with DeltaCP(30)/DeltaG(30). Both IGI and DeltaCP(30)/DeltaG(30) correlated significantly with the corresponding index from IVGTT, though IGI correlation was stronger (IGI: R = 0.67, P < 0.0001; DeltaCP(30)/DeltaG(30): R = 0.56, P < 0.0001). Also indices derived from areas under the curve of insulin, glucose and C-peptide were analyzed. Finally, we compared IGI to similar indices with samples at 60, 90 and 120 min, more often available than that at 30 min. We conclude that IGI is an acceptable index of beta-cell function, as also mirrored by DeltaCP(30)/DeltaG(30). However, the weaker correlation of the C-peptide index with the more accurate index from the IVGTT suggests that it should be used with caution. The index at 60 min can be used as surrogate of IGI, but not the indices at 90 and 120 min.

Area Under Curve↗

Large-for-gestational-age newborns in women with insulin-treated gestational diabetes under strict metabolic control.

OBJECTIVE: To assess the influence of strict metabolic control in women with insulin-treated gestational diabetes on the risk of large-for-gestational-age (LGA) newborns, the frequency of obstetrical complications and fetal outcome. METHODS: In this prospective cohort study, 875 women were screened for gestational diabetes mellitus with a 75 g oral glucose tolerance test (OGTT) between weeks 24 and 28 of gestation. The study group (n = 162) consisted of women with insulin-treated gestational diabetes mellitus (GDM) and the control group (n = 713) of women with normal glucose tolerance (NGT). In the women with diabetes, strict adjustments of fasting glucose levels to 90 mg/dl and 130 mg/dl postprandially were achieved with insulin administration. RESULTS: No increased risk for LGA newborns was observed in women with GDM and good metabolic control (16.7% vs. 12.3%; p = 0.1). In women with NGT, maternal prepregnancy BMI was significantly higher in those who delivered LGA newborns than in those who gave birth to newborns below the 90th percentile [27.2 kg/m(2) (5.0) vs. 24.4 kg/m(2) (5.6); p = 0.006], whereas there was no influence of maternal BMI on birth weight of newborns in women with GDM. There was no difference between the two groups with respect to maternal birth traumata and fetal outcome, except for plexus palsy which occurred in three GDM women with macrosomic newborns. CONCLUSION: Strict metabolic control and surveillance in women with insulin-treated GDM seems to attenuate the risk for LGA newborns, diabetic fetopathia, and the influence of maternal BMI on fetal growth.

Adult↗

Severe diabetic fetopathy despite strict metabolic control.

In pregnant women, diabetes mellitus (DM) can cause severe complications for both mother and child during pregnancy and delivery; for example, hypertension, pre-eclampsia, macrosomia or intrauterine fetal death. It is therefore essential to achieve good metabolic control in the mother from before conception to the postpartum period. A 35-year-old primipara with type 2 DM presented herself at our outpatient department at 21 weeks of gestation. Until this time her DM had been treated with oral antidiabetic drugs; these were withdrawn and conventional insulin therapy was initiated. Except for the first two weeks after insulin adjustment, blood glucose values were within the required range. Biometric tests performed until week 30 of gestation showed discreet fetal growth. In the week 31, fetal abdominal girth near the 95% limit was observed for the first time; this was soon followed by an explosion-like enlargement of the abdomen along with glycemic values at the lower limit. A cesarean section was performed in week 35 of gestation because of the excessive macrosomia. The female newborn had a birth weight of 4920 g and, one hour after delivery, a blood glucose of 10 mg/dl requiring an intravenous glucose bolus. In addition, the child needed oxygen and also needed both an enteral and a parenteral supply of glucose until day 7 after delivery. Mother and child were discharged from the clinic 19 days postpartum in good general condition. This case illustrates the complexity of treatment of glucose-tolerance disturbances during pregnancy and underlines the importance of fetal monitoring by ultrasound, given that measurement of maternal blood glucose does not always provide sufficient information on the metabolic situation of the fetus.

Administration, Oral↗

Decreased plasma adiponectin concentrations in women with gestational diabetes mellitus.

OBJECTIVE: Adiponectin is an adipocyte-specific protein that has been found to be associated with insulin sensitivity and obesity. Because gestational diabetes mellitus is associated with obesity and decreased insulin sensitivity, we have analyzed plasma adiponectin levels in women with gestational diabetes mellitus. STUDY DESIGN: Twenty women with gestational diabetes mellitus and 21 unaffected women were included in the study. Plasma adiponectin levels were analyzed with the use of enzyme-linked immunosorbent assay. RESULTS: Women with gestational diabetes mellitus were significantly older (34.3 years vs 29.4 years; P < .001) than unaffected women. Adiponectin plasma levels were significantly lower in women with gestational diabetes mellitus when compared with women without gestational diabetes mellitus (5827 +/- 1988 ng/mL vs 8085 +/- 3816 ng/mL; P = .02). Adiponectin plasma levels were correlated negatively with plasma glucose concentrations of the oral glucose tolerance test ( r > -0.38; P < .04) and correlated positively with gestational age ( r = 0.36; P = .03). CONCLUSION: Our data show that decreased plasma adiponectin levels were found in women with gestational diabetes mellitus compared with unaffected women.

Adiponectin↗

Fetal hyperinsulinism and maternal one-hour postload plasma glucose level.

OBJECTIVE: Fetal insulin concentrations reflect the intrauterine glucose load given the fetus by the mother. In this study, we assessed the association between maternal glucose levels during oral glucose tolerance testing and fetal cord insulin. METHODS: Pregnant women with an oral glucose tolerance test (OGTT) result were included in this prospective study. The patients were divided into 3 groups according to their 1-hour OGTT glucose concentration: up to 160 mg/dL (control, group I), 160-179 mg/dL (intermediate, group II), and gestational diabetes mellitus (GDM, group III). Patients with GDM were assigned to insulin therapy if blood glucose levels were not in the preferable range. RESULTS: Of the 930 patients who entered the study, 570 (61.3%) were assigned to group I, 76 (8.2%) to group II, and 284 (30.5%) to group III. The cord blood insulin value was significantly (P < .001, Mann-Whitney test) higher in group II (median, 12.8 microU/mL; range, 3-130 microU/mL) than in group I (median, 7.25 microU/mL; range, < 3-98 microU/mL). Cord blood insulin values were higher, albeit not significantly (P = .100, Mann-Whitney test), in group II than in group III (median, 9.9 microU/mL; range, < 3-61 microU/mL). CONCLUSION: Children whose mothers had a 1-hour value between 160 and 179 mg/dL had significantly higher cord blood insulin values than offspring of women with a 1-hour value below 160 mg/dL.

Adolescent↗

Plasma adiponectin, insulin sensitivity, and subclinical inflammation in women with prior gestational diabetes mellitus.

OBJECTIVE: Women with prior gestational diabetes mellitus (pGDM) are at increased risk of developing type 2 diabetes and associated vasculopathy. Because increased fat mass and inflammatory processes are angiopathic risk factors, the relationship between insulin sensitivity, parameters of subclinical inflammation, and plasma concentrations of adipocytokines was investigated in pGDM both at 3 months and 12 months after delivery. RESEARCH DESIGN AND METHODS: Insulin sensitivity (through a frequently sampled intravenous glucose tolerance test) and plasma concentrations of ultrasensitive C-reactive protein (CRP), adiponectin, plasminogen activator inhibitor (PAI)-1, tumor necrosis factor-alpha, leptin, and interleukin-6 were measured in 89 pGDM (BMI 26.9 +/- 0.5 kg/m(2), age 32 +/- 0.5 years) and in 19 women with normal glucose tolerance during pregnancy (NGT) (23.7 +/- 0.9 kg/m(2), 31 +/- 1.3 years). RESULTS: pGDM showed lower (P < 0.0001) plasma adiponectin (6.7 +/- 0.2 microg/ml) than NGT (9.8 +/- 0.6 microg/ml) and a decreased (P < 0.003) insulin sensitivity index (S(i)) and disposition index (P < 0.03), but increased plasma leptin (P < 0.003), PAI-1 (P < 0.002), and CRP (P < 0.03). After adjustment for body fat mass, plasma adiponectin remained lower in pGDM (P < 0.004) and correlated positively with S(i) (P < 0.003) and HDL cholesterol (P < 0.0001) but negatively with plasma glucose (2-h oral glucose tolerance test [OGTT]) (P < 0.0001), leptin (P < 0.01), CRP (P < 0.007), and PAI-1 (P < 0.0001). On regression analysis, only HDL cholesterol, postload (2-h OGTT) plasma glucose, and S(i) remained significant predictors of plasma adiponectin, explaining 42% of its variability. Of note, adiponectin further decreased (P < 0.05) only in insulin-resistant pGDM despite unchanged body fat content and distribution after a 1-year follow-up. CONCLUSIONS: Lower plasma adiponectin concentrations characterize women with previous GDM independently of the prevailing insulin sensitivity or the degree of obesity and are associated with subclinical inflammation and atherogenic parameters.

Adiponectin↗

Haptoglobin phenotype and gestational diabetes.

OBJECTIVE: Haptoglobin (Hp), an Hb-binding plasma protein, exists in two major allelic variants. Hp1 has higher Hb binding and antioxidant capacity compared with Hp2. Individuals with Hp1 exhibit a lower incidence of angiopathies. Gestational diabetes mellitus (GDM) is an early manifestation of type 2 diabetes in pregnant women. It is usually confined to the time of gestation, but carries an increased risk to develop type 2 diabetes later in life. RESEARCH DESIGN AND METHODS: From consecutive Caucasian pregnant women (n = 250) referred for oral glucose tolerance testing, the Hp phenotype was determined. Significance of distribution and odds ratios (ORs) associated with Hp phenotype were calculated for women with GDM (n = 110) and women with normal glucose tolerance (n = 140). RESULTS: -Frequency of GDM in Hp phenotype classes increased with the number of Hp2 alleles (P < 0.001). ORs for GDM in women heterozygous and homozygous for Hp2 were 2.7 (95% CI 1.06-6.84) and 4.2 (1.67-10.55), respectively. CONCLUSIONS: Hp phenotype is an apparent risk factor for the development of GDM in our study population. This might be due to the low antioxidative potential of Hp2 compared with Hp1.

Adult↗

[Therapy with oral antidiabetic drugs].

Hyperglycemia contributes to morbidity and mortality in diabetic patients. Reaching treatment targets with regard to control of glycemia is thus a central goal in the treatment of diabetic patients. The present article represents the recommendations of the Austrian Diabetes Association for the practical use of oral antidiabetic drugs according to current scientific evidence.

Administration, Oral↗

[Therapy with insulin].

Hyperglycemia contributes to morbidity and mortality in diabetic patients. Reaching treatment targets with regard to control of glycemia is thus a central goal in the treatment of diabetic patients. The present article represents the recommendations of the Austrian Diabetes Association for the practical use of insulin according to current scientific evidence.

Austria↗

[Gestational diabetes mellitus].

Gestational diabetes (GDM) is defined as any degree of glucose intolerance with onset or first recognition during pregnancy and is associated with increased feto-maternal morbidity as well as long-term complications in mothers and offspring. GDM is diagnosed by an oral glucose tolerance test (OGTT) or fasting glucose concentrations in the diabetic range. In case of a high risk for GDM/type 2 diabetes (history of GDM or prediabetes [impaired fasting glucose or impaired glucose tolerance]; malformation, stillbirth, successive abortions or birth-weight > 4500 g in previous pregnancies) performance of the OGTT (120 min; 75 g glucose) is recommended already in the first trimester and--if normal--the OGTT should be repeated in the second/third trimester. In case of clinical symptoms of diabetes (glucosuria, macrosomia) the test has to be performed immediately. All other women should undergo a diagnostic test between 24 and 28 gestational weeks. If fasting plasma glucose exceeds 95 mg/dl, 1 h 180 mg/dl and 2 hrs 155 mg/dl after glucose loading (OGTT) the woman is classified as GDM (one pathological value is sufficient). In this case a strict metabolic control is mandatory. All women should receive nutritional counseling and be instructed in blood glucose self-monitoring. If blood glucose levels cannot be maintained in the normal range (fasting < 95 mg/dl and 1 h after meals < 130 mg/dl) insulin therapy should be initiated. Maternal and fetal monitoring is required in order to minimize maternal and fetal/neonatal morbidity and perinatal mortality. After delivery all women with GDM have to be reevaluated as to their glucose tolerance by a 75 g OGTT (WHO criteria).

Blood Glucose↗

Basal and dynamic proinsulin-insulin relationship to assess beta-cell function during OGTT in metabolic disorders.

The fasting proinsulin-to-insulin ratio is a currently used marker of beta-cell dysfunction. This ratio is calculated at the basal condition, but its behavior in dynamic conditions, i.e., during glucose stimulation, could be more informative. Given the different kinetics of the peptides, a mathematical model was necessary to analyze the oral glucose tolerance test (OGTT) data of insulin, C-peptide, and proinsulin in 55 healthy (NGT), 30 impaired glucose-tolerant (IGT), and 31 type 2 diabetic (T2DM) subjects. The model provided for secretion and disappearance of the peptides and an index of beta-cell function under dynamic conditions. Total proinsulin secretion during the OGTT was not different (P > 0.053) among NGT (0.17 +/- 0.01 mmol/l in 3 h), IGT (0.22 +/- 0.02), and T2DM (0.21 +/- 0.02) subjects. The proinsulin-to-insulin molar ratio measured from basal samples was higher (P < 0.0001) in T2DM (0.39 +/- 0.05) than in NGT (0.14 +/- 0.01) and IGT (0.13 +/- 0.02) subjects, and similar results (P < 0.003) were found by the dynamic index (0.27 +/- 0.04, 0.14 +/- 0.01, 0.15 +/- 0.01 in T2DM, NGT, IGT subjects, respectively). The basal ratio significantly correlated with the dynamic index, and the regression line slope was lower than 1 (0.43 +/- 0.08, 0.61 +/- 0.10, and 0.56 +/- 0.03 in NGT, IGT, and T2DM subjects, respectively, P < 0.0001). Impaired beta-cell function in T2DM could then be indicated by proinsulin-to-insulin indexes at both basal and dynamic phases.

Adult↗

[Gestational diabetes].

Gestational diabetes (GDM) is defined as any degree of glucose intolerance with onset or first recognition during pregnancy. GDM is becoming an increasing health problem worldwide and one of the most common complications of pregnancy. The prevalence of GDM in Central Europe is 5-7%. GDM is associated with increased feto-maternal morbidity as well as long-term complications in mothers and offspring. The key symptom of GDM is the development of diabetic fetopathy. Fetal hyperinsulinism is associated with macrosomia and a higher rate of birth injuries and caesarean sections, neonatal hypoglycemia, respiratory distress and due to fetal programming the development of the sequelae of the metabolic syndrome in childhood or adolescence. GDM is commonly diagnosed by an oral glucose tolerance test (OGTT) between gestational weeks 24 and 28. In addition, in case of a high risk of GDM (history of poor obstetric outcome: stillbirth, congenital malformation, birth weight > or = 4500 g or a history of impaired glucose tolerance or impaired fasting glucose) impaired glucose metabolism or diabetes should be excluded in the first trimester. GDM shares the same pathophysiology and clinical signs as diabetes mellitus type 2. Thus maternal obesity, higher age, hypertension as well as a positive family history of type 2 diabetes are high risk factors for the development of GDM. If GDM is diagnosed, a strict metabolic control is mandatory. All women should receive nutritional counseling and be instructed in blood glucose self-monitoring. If blood glucose levels cannot be maintained in the normal range (fasting < 95 mg/dl and 1 h after meals < 130 mg/dl), insulin therapy should be initiated. Maternal and fetal monitoring is required in order to minimize maternal and fetal/neonatal morbidity and perinatal mortality. After delivery, all women with GDM have to be reevaluated as to their glucose tolerance by a 75 gOGTT (WHO criteria). While 85% of these women will return to normal glucose tolerance 8 weeks postpartum, those with persisting impaired glucose tolerance are at particularly high risk for diabetes.

Cross-Sectional Studies↗

Mode of action of ipomoea batatas (Caiapo) in type 2 diabetic patients.

We have previously reported the beneficial effects of Caiapo, the extract of white-skinned sweet potato (ipomoea batatas), on fasting plasma glucose, as well as on total and low-density lipoprotein (LDL) cholesterol in type 2 diabetic patients. The present study aimed to describe the underlying mechanism responsible for the improvement in metabolic control following administration of Caiapo in those type 2 subjects. A total of 18 male patients (age=58+/-8 years, body mass index [BMI]=27.7+/-2.7 kg/m2, mean +/- SEM) treated only by diet were randomized into 3 groups (placebo, low-dose Caiapo, 2 g/d, and high-dose, 4 g/d). Parameters related to glucose tolerance, glucose disappearance, and insulin secretion were obtained by performing both frequently sampled intravenous glucose tolerance test (FSIGT) and oral glucose tolerance test (OGTT) before and after 6 weeks of treatment with Caiapo. Following treatment with high dose Caiapo, insulin sensitivity significantly ameliorated when assessed both with OGTT (from 308+/-13 mg/min/m2 to 334+/-10, P=.048) and FSIGT (from 1.21+/-0.32 10(4) min(-1)/(microU/mL) to 1.73+/-0.40, P=.021). Improvement of insulin sensitivity with the low dose was observed only with the FSIGT (from 2.02+/-0.70 10(4) min(-1)/(microU/mL) to 2.76+/-0.89, P<.05). Glucose effectiveness did not change. While no changes in glucose tolerance were observed in the placebo and low-dose groups, it increased from 0.85+/-0.13 %min(-1) to 1.46+/-0.13 (P<.02) in patients on high dose. No significant changes were seen in any of the parameters related to insulin dynamics: insulin secretion (from C-peptide), distribution, clearance, and hepatic extraction remained virtually the same after the treatment. In conclusion, short-term treatment with 4 g/d of the nutraceutical Caiapo consistently improved metabolic control in type 2 diabetic patients by decreasing insulin resistance without affecting body weight, glucose effectiveness, or insulin dynamics. No side effects related to the treatment were observed. Thus these results indicate that Caiapo could potentially play a role in the treatment of type 2 diabetes.

Blood Glucose↗

Increased intramyocellular lipid concentration identifies impaired glucose metabolism in women with previous gestational diabetes.

Women with previous gestational diabetes (pGDM) are frequently insulin-resistant, which could relate to intramyocellular lipid content (IMCL). IMCL were measured with (1)H nuclear magnetic resonance spectroscopy in soleus (IMCL-S) and tibialis-anterior muscles (IMCL-T) of 39 pGDM (32 +/- 2 years, waist-to-hip ratio 0.81 +/- 0.01) and 22 women with normal glucose tolerance (NGT; 31 +/- 1 years, 0.76 +/- 0.02) at 4-6 months after delivery. Body fat mass (BFM) was assessed from bioimpedance analysis, insulin sensitivity index (S(I)), and glucose effectiveness (S(G)) from insulin-modified frequently sampled glucose tolerance tests. pGDM exhibited 45% increased BFM, 35% reduced S(I) and S(G) (P < 0.05), and 40% (P < 0.05) and 55% (P < 0.005) higher IMCL-S and IMCL-T, respectively. IMCL related to body fat (BFM P < 0.005, leptin P < 0.03), but only IMCL-T correlated (P < 0.03) with S(I) and glucose tolerance index independent of BMI. Insulin-resistant pGDM (n = 17) had higher IMCL-S (+66%) and IMCL-T (+86%) than NGT and insulin-sensitive pGDM (+28%). IMCL were also higher (P < 0.005, P = 0.05) in insulin-sensitive pGDM requiring insulin treatment during pregnancy and inversely related to the gestational week of GDM diagnosis. Thus, IMCL-T reflects insulin sensitivity, whereas IMCL-S relates to obesity. IMCL could serve as an additional parameter of increased diabetes risk because it identifies insulin-resistant pGDM and those who were diagnosed earlier and/or required insulin during pregnancy.

Adult↗