ABSTRACT
Objective To investigate the relationship between single nucleotide polymorphism of vitamin D receptor (VDR) genes and osteoporosis in Chinese Northern Han patients with chronic obstructive pulmonary disease (COPD). Methods Patients with acute exacerbation COPD were enrolled and divided into osteoporosis and non-osteoporosis groups. Genomic DNA was extracted from peripheral blood of the subjects. UCSC genome browser and haploview 4.2 software were used to screen the tag single nucleotide polymorphism (tagSNPs) of VDR gene. The selected tagSNPs of VDR gene were genotyped by Sequenom MassARRAY SNP platform. Logistic regression was used to analyze the OR values and confidence intervals (CI) of each tagSNP in the codominant, dominant and recessive genetic models, and assess the relationship between single nucleotide polymorphisms in VDR gene and osteoporosis in COPD patients. Results A total of 379 COPD patients were enrolled. The group of osteoporosis and non-osteoporosis differed significantly in gender, age, alcohol assumption, peripheral platelet counts, serum phosphorus and serum creatinine levels (P<0.05). Finally, 17 tagSNPs of VDR gene (rs2238140 G/A, rs2228570 G/A, rs2408877 A/T, rs12721370 C/A, rs7299460 T/C, rs2239184 G/A, rs2239186 A/G, rs7136534 C/T, rs12721364 G/A, rs2853561 C/T, rs7965943 T/G, rs11168287 G/A, rs11608702 T/A, rs2239179 T/C, rs2189480 T/G, rs59707231 T/A, rs2853559 C/T) were filtered out for association analysis. Patients of rs2853561 carrying T/C and T/T genotypes had a lower risk of developing osteoporosis than those carrying C/C genotype in COPD patients (in dominant mode: T/C+T/T vs. C/C, OR=0.34, 95%CI 0.18-0.63, P=0.0003539) with statistical significance. Conclusions The present study has revealed significant relationship between rs2853561 of VDR gene and osteoporosis in patients with COPD. Further studies are needed to discover the mechanism of VDR gene polymorphism in the pathogenesis of osteoporosis in COPD.
ABSTRACT
Objective To investigate the association between gasification and duration and power of radiofrequency ablation in porcine muscle and liver and compare the effects in these tissues in an in vitro study. Methods Radiofrequency ablation was performed on fresh muscle and liver tissue,and the maximum cross-sectional volume of gasification was used to compare the effects according to duration and power of ablation. The experiment was repeated three times,and data were averaged. Results Within a certain range,gasification volume increased significantly with increases in ablation duration and power (P < 0.05). Gasification volumes differed significantly between tissues (P < 0.05). The gasification volume was smaller in muscle than in liver at 15 W and 30 W,while the affected volume in muscle was greater than in liver at 45 W (P < 0.05). Conclusion Under conditions of the same duration and power,the gasification volumes were different in muscle and liver. Therefore,the power and time required for maximum gasification in different tissues may be different.
ABSTRACT
Objective To explore the risk factors of osteoporosis and the relation with pulmonary dysfunction in elderly patients with chronic obstructive lung disease (COPD). Methods One hundred and eighty patients (82 females and 98 males) with acute exacerbation of chronic obstructive lung disease (AECOPD) from March 2006 to June 2008 were selected in the study. The bone mineral density (BMD) of lumbar vertebrae and hip joint were determined by dual energy X-ray absorptiometry(DEXA). All the patients were divided into two COPD groups with and without osteoporsis. The smoking history, incidence of vertebral fractures, glucocorticosteroid using condition and so on were recorded. The pulmonary function, 6-minute walk distance(6MWD), body mass index (BMI) and serum albumin concentration were evaluated. Results The mean age of all patients was (72±7)years, and the average smoking amount was (59±27)pack years. The ratio of forced expiratory volume in 1 second to forced vital capacity (FEV1/FVC) was(36.46±9.8)%, and 30% of the patients had inhaled or oral glucocorticoids for more than 3 months. The BMD measurement results showed that BMD of 95% patients(171 cases) was lower than the normal level, and 119 cases (66%) had osteoporosis, including 61 males and 58 females (62%vs. 70%, x2 = 1.435, P=0.33), and 52 cases had (29%) osteopenia. Linear correlation analysis showed that BMI, 6MWD, RV% and FVC% had positive correlation with osteoporosis (r=0.362, 0.635, 0.688, 0.973;all P<0.05).Conclusions The prevalence of osteoporosis is high in elderly patients with moderate or severe COPD, and enough attention and active intervention shoule be paid.