You will be shown an abstract from a biomedical research paper. Given this abstract, your task is to extract all unique entities of the following types: ["Chemical"].

Please return the output as a JSON object of the format: {"Chemical": ["Arsenic", ...]}. The keys should be entity types and values should be lists of extracted entities belonging to the corresponding type. If you cannot find entities belonging to a specific type, the value should be [].

Only output the JSON object and do not include any additional text.

Abstract:

Association of serum adiponectin and IGF-I levels with parameters of cardiac remodeling in severely obese patients. Background. Obesity is associated with various changes in cardiac geometry and this process involves both hemodynamic and non-hemodynamic factors, among which adipocitokines and growth factors may play an important role The aim of this study was to identify the extent and pattern of cardiac remodeling in a group of severely obese patients and analyze the relationship between adiponectin, IGF-I and cardiac parameters reflecting obesity associated structural changes. Subjects and methods. Our study included 344 patients (104 men) with severe obesity (mean body mass index (BMI)= 45.7±8.5 kg/m2), extensively evaluated clinically and biologically (complete metabolic tests, serum adiponectin and IGF-I measurements). Left ventricular mass index (LVMI), left atrium (LA) size and LV geometry were determined by means of cardiac ultrasound. Results. The most prevalent pattern of LV geometry was eccentric hypertrophy (28.7% of patients). In a gender, age, BMI, diabetes and hypertension adjusted general linear model, patients with concentric or eccentric hypertrophy had significantly lower values of adiponectin than those with normal geometry (6.75±0.41, 6.96±0.53, versus 9.04±0.42 mg/l, p<0.05). In multivariate analysis, independent determinants for LVMI were BMI (B=0.364, p<0.001), systolic blood pressure (BP) (β=0.187, p=0.004), age (β=0.246, p<0.001), adiponectin (β=-0.151, p=0.012) and IGF-I z-score (β=0.134, p=0.025) while factors independently related to LA size were systolic BP (β=0.218, p<0.001), BMI (β=0.194, p<0.001), age (β=0.273, p<0.001), gender (β=-0.195, p<0.001) and adiponectin (β=-0.180, p=0.005). Conclusions: In patients with severe obesity, IGF-I z score and adiponectin correlate with parameters of cardiac remodeling independently of anthropometric, hemodynamic or metabolic factors.
{"Chemical": []}