Predictive value of P-wave and QT interval dispersion in children with congenital heart disease and pulmonary arterial hypertension for the occurrence of arrhythmias

Objectives

To evaluate P-wave dispersion (PWD) and QT dispersion (QTd) in children with congenital heart disease and pulmonary arterial hypertension (PAH-CHD) and to investigate the predictive value of both PWD and QTd for prediction of arrhythmias in such children.

Reduction in colon cancer risk by consumption of kava or kava fractions in carcinogen-treated rats

Epidemiological studies suggest that kava reduces colon cancer risk. However, no experimental studies of the chemopreventive properties of kava toward colon cancer have been reported. Further, there are concerns regarding hepatotoxicity of kava. The goal of this study was to determine whether kava consumption reduces markers of colon cancer in an animal model and to study the safety of kava. An ethanolic extract and polar and nonpolar fractions of the kava extract were fed to rats for 12?days prior to, during, and after administration of dimethylhydrazine, a colon-specific carcinogen. After 14 wk, rats fed the nonpolar extract had a significant reduction in precancerous lesions [aberrant crypt (AC) foci (ACF)] as well as large (≥4 AC/ACF) sialomucin-only expressing foci, an indicator of greater tumorigenic potential, compared to the control group. Groups fed the ethanolic extract and polar kava fraction trended toward reductions in ACF and large sialomucin-only expressing foci. The combined kava groups had significantly fewer total AC, ACF, large ACF, and large sialomucin-only expressing foci compared to the control group. Histological examination found no hepatic lesions in animals consuming the kava diets, suggesting that kava is safe to consume. Our results support that kava may reduce colon cancer risk.     

Antifungal activity of eupolauridine and its action on DNA topoisomerases

The azafluoranthene alkaloid eupolauridine has previously been shown to have in vitro antifungal activity and selective inhibition of fungal topoisomerase I. The present study was undertaken to examine further its selectivity and mode of action. Eupolauridine completely inhibits the DNA relaxation activity of purified fungal topoisomerase I at 50 microg/ml, but it does not stabilize the cleavage complex of either human or fungal topoisomerase I. Cleavage complex stabilization is the mode of action of topoisomerase I targeting drugs of the camptothecin family. Also, unlike camptothecin, eupolauridine does not cause significant cytotoxicity in mammalian cells. To determine if the inhibition of topoisomerase I is the principal mode of antifungal action of eupolauridine, Saccharomyces cerevisiae strains with alterations in topoisomerase genes were used in clonogenic assays. The antifungal activity of eupolauridine was not diminished in the absence of topoisomerase I; rather, the cells lacking the enzyme were more sensitive to the drug. Cell-killing activity of eupolauridine was also more pronounced in cells that overexpressed topoisomerase II. In vitro assays with the purified yeast enzyme confirmed that eupolauridine stabilized topoisomerase II covalent complexes. These results indicate that a major target for fungal cell killing by eupolauridine is DNA topoisomerase II rather than topoisomerase I, but does not exclude the possibility that the drug also acts against other targets.     

A meta-analysis of eNOS and ACE gene polymorphisms and risk of pre-eclampsia in women

A meta-analyses of endothelial nitric oxide synthase (eNOS) and angiotensin-converting enzyme (ACE) gene polymorphisms in pre-eclampsia was performed. We shortlisted 33 studies (17 for ACE; 16 for eNOS gene polymorphisms), of which 29 articles (16 for ACE and 15 for eNOS) were analysed. Overall, 1,620 cases with pre-eclampsia and 2,158 controls were analysed for intron 16 insertion-deletion polymorphism in ACE gene. A total of 1,610 subjects with pre-eclampsia and 2,875 controls were analysed for the Glu298Asp in eNOS gene. Overall, the random-effects odds ratio (OR) with Glu298Asp in eNOS gene was 0.958 (95% confidence intervals, CI 0.747-1.228, p > 0.05), and for the insertion-deletion/ACE polymorphism was 0.987 (95% CI 0.698-1.395, p > 0.05). Significant heterogeneity was observed in the studies that evaluated polymorphisms in ACE (Q value = 55.6; I(2) = 73; p value = 0.000); and eNOS (Q value = 37.2; I(2) = 62.4; p value = 0.001) polymorphisms. No significant risk of pre-eclampsia was observed in both eNOS and ACE genes with these polymorphisms.     

Isolation of lignans and biological activity studies of Ephedra viridis

Phytochemical investigation of Ephedra viridis (whole plant) led to the isolation of four lignans including (+)-9-acetoxyisolariciresinol, which is a new lignan, lariciresinol, 9-acetoxylariciresinol and isolariciresinol. All the isolates were tested for their antioxidant activity and cytotoxicity against a panel of solid tumor and human leukemia cells. They were also screened for estrogenic activity using a recombinant yeast estrogen screening (YES) assay. Most of the lignans exhibited moderate antioxidant activity without any cytotoxicity. None of them were estrogenic in the YES assay.     

Self-awareness of HbA1c and its association with glycemic control among patients with type 2 diabetes: A multicenter study

Objectives:To measure the self-awareness of hemoglobin A1c (HbA1c) prevalence among type 2 diabetic Saudi patients and its association with glycemic control, thereby identifying those factors that might affect their glycemic control.Methods:This multicenter study was carried out in outpatients’ diabetes clinics in tertiary hospitals in Riyadh, Qassim, and Jeddah, Saudi Arabia. The data was collected using questionnaires. The subject’s self-awareness on the HbA1c test was assessed based on the combined score of 4 questions. The latest HbA1c result before the time of data collection was obtained from medical records. Data was analyzed using bivariate and multivariate statistical methods.Results:The prevalence of HbA1c self-awareness was approximately 44.5%. A total of 4 participants characteristics (glycemic control, education level, monthly income and number of follow-up visits) were associated with awareness of HbA1c. Whereas for better glycemic control; type of treatment, duration of diabetes, and self-awareness of HbA1c were independently statistically significantly associated.Conclusion:There is a positive association between HbA1c self-awareness and glycemic control. Glycemic control was good among those who were educated on the meaning of the test, their levels, and their target goal. Awareness among health care providers regarding the role of the patient’s education regarding their condition might help in providing the patient with optimal care. Further studies with different experimental designs are needed to study this association, which will contribute to the development of a structured educational program.     

Use of lipid‐lowering therapies in patients with chronic kidney disease and atherosclerotic cardiovascular disease: 2‐year results from Getting to an imprOved Understanding of Low‐Density lipoprotein cholesterol and dyslipidemia management (GOULD)

BackgroundChronic kidney disease (CKD) is a known risk factor of atherosclerotic cardiovascular disease (ASCVD). Per the 2018 American Heart Association/American College of Cardiology cholesterol guidelines, high‐risk ASCVD patients with CKD and low‐density lipoprotein cholesterol (LDL‐C) levels ≥ 70 mg/dL should take a high‐intensity statin with ezetimibe and/or a proprotein convertase subtilisin/kexin type 9 inhibitor (PCSK9i).Objective/MethodsWe examined the changes in use of lipid lowering therapies (LLT) over two years in 3304 patients with ASCVD and CKD in the Getting to an imprOved Understanding of Low‐Density Lipoprotein Cholesterol and Dyslipidemia Management (GOULD) observational cohort study.ResultsOf those with eGFR <60 ml/min/1.73 m², 21.6% (171/791) had intensification of LLT while 10.4% (82/791) had de‐escalation of LLT. Notably, 61.6% (487/791) had no change in LLT regimen over 2 years. Statin use was 83.2% (785/944) at baseline and 80.1% (634/791) at 2 years. Statin/ezetimibe use increased from 2.9% (27/944) to 4.9% (39/791). Statin discontinuation at 2 years was greater with lower eGFR levels across all cohorts.ConclusionDespite the recommendations of multiscociety guidelines, statin use, while high, is not ubiquitous and rates of high‐intensity statin and ezetimibe use remain low in patients with CKD. There remains a significant opportunity to optimize LLT and achieve atheroprotective cholesterol levels in the CKD population.     

Structural,morphological, and optical properties of carbon nanoparticles unsheathed from date palm fronds

Several studies have reported the synthesis of carbon nanoparticles (CNPs) by various methods. In this study, an easy one-step process to unsheathe CNPs from date palm fronds through a top-down ball milling method has been reported. The CNPs were characterized using various spectroscopic and microscopic methods to determine their structural and morphological features, optical properties, crystallinity, physicochemical properties, and particle stability. Transmission electron microscopy (TEM) revealed that the obtained CNPs'' size ranged from 4 to 22 nm in a crystalline form. Scanning electron microscopy (SEM) confirmed their spherical shape, while the maximum photoluminescence (PL) intensity was recorded at 464 nm when excited at 375 nm. The unsheathed CNPs produced a good quantum yield (QY) of 3.24%. Furthermore, the CNPs exhibited high Raman ratios of I_D/I_G and I_2D/I_G with values of 0.59 and 0.04, respectively, verifying their multilayer crystalline graphitic nature. These Raman ratios also agree with the X-ray diffractometry (XRD) results. The CNPs'' sp² and sp³ carbon bonds were confirmed by X-ray photoelectron spectroscopy (XPS), with oxygen on the surface forming carboxyl and carbonyl groups with no other observable impurities. Furthermore, the extracted CNPs showed excellent PL properties for up- and down-conversion. These properties are exemplary for low-cost biomass with potential applications in biomedicine. Therefore, the extracted CNPs reported in this study have potential applications in optical imaging.

Several studies have reported the synthesis of carbon nanoparticles (CNPs) by various methods.