Background: Coronary collateral circulation (CCC) is linked to myocardial remodeling severity in patients with chronic ischaemic heart disease (IHD). However its effect on left ventricular reverse remodeling (LVRR) in patients with chronic IHD underwent coronary artery bypass surgery (CABG) has never been reported. Purpose of this study was to investigate the effect of CCC grade on the LVRR event in patients with chronic IHD underwent CABG. Methods: This prospective cohort study was performed in patients with chronic IHD underwent CABG. The CCC was classified using Rentrop collateral score, i.e low CCC grade (Rentrop score 0 and 1) and high CCC grade (Rentrop score 2 and 3).  LVRR event was defined as a reduction in left ventricular end systolic volume (LVESV) of 10% or more, measured by a 3D echocardiography at 1.5 months post CABG compared to the baseline before CABG. Results: A total of 22 patients (81.8% male) with mean of age 58.6 years old were enrolled. LVRR occurred in 50% patients. LVRR event was significantly higher in the patients with high CCC grade than the low CCC grade patients (p=0.009). The high CCC grade increased LVRR event independently (odds ratio=26.67; relative risk=6.93). Conclusions: High coronary collateral circulation may increase left ventricular reverse remodeling event in patients with chronic ischemic heart disease underwent coronary artery bypass surgery. Keywords: coronary collateral circulation; left ventricular reverse remodeling; chronic ischaemic heart disease; coronary artery bypass surgery; 3D echocardiography.

Total-Cholesterol (TC) to HDL-Cholesterol (HDL-C) ratio in athletes is well-known to be better than sedentary people. However, information about comparison of TC/HDL-C in different groups of cyclists based on cycling touring characteristics and anthropometry parameters is lacking. This study aimed to compare TC/HDL-C ratio between groups based on the type of tour in cyclists population. Eighty-eight participants were recruited in this cross-sectional study. Mean differences of parameters between groups was analyzed by One-Way Anova and independent t-test, whereas multivariate analyses was conducted by binary logistic-regression. P value <0.05 was considered statistically significant. TC/HDL-C ratio in all groups were less than 4.5. There is no differences of TC-levels (NC240K: 216.6±55.04, TdB140K: 208.1±27.13, TdB100K: 203.1±31.95; p=0.427). But there is significantly different level of HDL-C (NC240K: 68.9±19.09, TdB140K: 52.1±13.9, TdB100K: 53.6±12.45; p=0.0001) and TC/HDL-C ratio (NC240K: 3.3±1.12, TdB140K: 4.2±1.07, TdB100K: 4.0±1.06; p=0.007). Between TC/HDL ratio groups (≥4 or <4), there were differences of weight, BMI, waist-circumference, hip-circumference and type of tour (p<0.05). Finally, BMI and type of tour were the most influential factor. Long-distance cyclists have a synergistic effect of lipid profile and anthropometry measurements, and heavier cycling tour participant, that represent cycling training habits, tend to have lower TC/HDL ratio(< 4).