[Show abstract][Hide abstract] ABSTRACT: Disturbed lipid profile is one of the most important and potent risk factors in ischemic heart disease (IHD). In recent years, it has been demonstrated that raised oxidative stress promotes several undesirable pathways including the formation of oxidised LDL (O-LDL) and oxidized cholesterol which encourages cholesterol accumulation in arterial tissues. We, therefore, aimed to ascertain the redox balance by measuring oxidative stress (OS) and total antioxidant activity (TAA) along with lipid profile to determine their possible association with IHD. Our study group comprised of 28 confirmed cases of IHD. The inclusion criterion was history of chest pain, ischemic changes in the ECG and good left ventricular (LV) function. Patients with diabetes mellitus, poor LV function, previous infarct and valvular heart disease were excluded. Lipid profile, plasma thiobarbituric acid reactive substances (TBARS), plasma total antioxidant activity (TAA) and urinary TBARS were estimated in these patients by standard procedures and the values were compared with 30 age, sex and socioeconomically matched normal healthy control subjects. Body mass index (BMI) and waist/hip ratio (W/H ratio) was also noted in both the groups. Lipid profile and OS (TBARS levels) were significantly raised in IHD patients. Though statistically not significant but TAA tended to be lower and urinary TBARS levels tended to be higher in patients. BMI, W/H ratio, smoking and alcohol did not show discernible association with lipid profile, OS or TAA. OS is significantly raised in majority of IHD patients. The non association of BMI, W/H ratio, smoking and alcohol with lipid profile, OS and TAA suggest that there are other risk factors which primarily contribute to the initiation and progression of IHD.
[Show abstract][Hide abstract] ABSTRACT: Diabetes mellitus (DM) is often termed as a disease of premature aging. Several studies have indicated lopsided redox balance due to pro oxidant environment as one of the important etiological factors. Some recent researches also indicate a causal relationship with oxidative stress (OS). So far, no study has been undertaken on this aspect in Nepali populations. We, therefore, aimed this maiden study in Nepali population to examine redox balance by measuring OS and antioxidant status along with lipid profile in 37 patients of DM type- 2 and 30 matched normal subjects.
Thirty seven patients of DM type-2 without any complications (mean age= 57.6+/- 10.6 years) and 30 normal subjects (mean age= 55.8 +/- 14.8 years) were included in this study. Body Mass Index (BMI) and Waist/Hip (W/H) ratio were measured. Fasting blood sample was collected for the analysis of total antioxidant activity (TAA), plasma and urinary thiobarbituric acid reactive substances (TBARS) and lipid profile by standard procedures in both the groups. The statistical analysis was done with SPSS 10 version.
Total cholesterol, triglyceride, VLDL-cholesterol, LDL-cholesterol, plasma and urinary TBARS were significantly raised whereas, plasma TAA was significantly reduced in DM type-2 patients as compared to controls. The comparison of old and fresh cases revealed that though TAA was lower and PTBARS and UTBARS were higher in patients but did not attain the level of significance. W/H ratio is significantly higher in patients compared to normal subjects. But, no significant correlation of BMI and W/H with lipid profile is observed in both control and patients.
Oxidative stress is raised in type 2 DM patients. This along with deranged lipid profile and decreased antioxidant status could be the risk factors in the development of complications associated with DM.
Full-text · Article · Jan 2008 · Kathmandu University Medical Journal
[Show abstract][Hide abstract] ABSTRACT: Background: Hypertension is associated with an elevation of ROS and frequently also with an impairment of
endogenous antioxidant mechanisms. Increased level of serum cholesterol, TG, VLDL has been observed in patients
with hypertension. It has been shown that oxidized lipoprotein inactivates NO and aggravates hypertension. This study
intends to know the association of oxidative stress and lipid profile with hypertensive patients of the Western Nepal.
Methods: Our study group comprised of 32 confirmed cases of HTN. Inclusion criteria included the patients with
blood pressure ≥140/90mm of Hg. Patients with secondary hypertension, past history of stroke, coronary artery
disease (CAD), myocardial infarction, and peripheral vascular disease and diabetes mellitus were excluded. Serum lipid
profile, plasma thiobarbituric acid reactive substances (PTBARS), plasma total antioxidant activity (TAA) and urinary
thiobarbituric acid reactive substances (UTBARS) were estimated in these patients by standard procedures and the
values were compared with 30 age, sex and socioeconomically matched normal healthy control subjects.
Results: TBARS levels and Lipid profile were significantly raised in HTN patients, but TAA and urinary TBARS levels
were comparable to normal subjects. BMI and W/H ratio in patients were comparable to control. Smoking and alcohol
did not influence lipid profile, TBARS and TAA.
Conclusion: Lipid profile and TBARS were significantly raised in HTN patients compare to controls. Thus, monitoring
lipid level and maintaining oxidative balance in hypertensive patients would be helpful in preventing the diseases
associated with hypertension.
[Show abstract][Hide abstract] ABSTRACT: To observe if there is any connectivity between oxidative stress and cardiovascular diseases (CVDs).
Patients suffering from different cardiovascular diseases (hypertension, ischemic heart disease, rheumatic heart disease) attending Manipal Teaching Hospital, Pokhara and strictly matched controls were selected for this study. Oxidative stress (OS) was measured by plasma thiobarbituric acid reacting substances (TBARS) where as antioxidant status was measured by estimating vitamin E, vitamin C and total antioxidant activity (TAA) in plasma.
The mean level of TBARS, TAA, vitamin C and E were 2.20+0.43 nmol/ml, 547+98 mol/l, 0.88+0.15 mg/dl and 0.75+0.20 mg/dl respectively in patients. The respective values in controls were 1.86+0.43 nmol/ml, 859+139 mol/l, 0.94+0.15 mg/dl and 1.10+0.30 mg/dl. Although the OS seems to be raised in patients, is practically insufficient to oxidize biomolecules and induce CVDs. Despite vitamin C and E levels being well within normal limits, the TAA was significantly and considerably lower in patients. This is a highly interesting observation suggesting that dietary antioxidants other than these vitamins were preferentially consumed to control OS because procedure for TAA used in this study practically measures only total dietary antioxidants.
OS does not appear to be an etiological factor for the cardiovascular diseases; rather slightly raised OS in patients seems to be a consequence. Further the raised OS was not due to lower nutrient antioxidant (vit. C and vit. E) in the local population studied herein.
Preview · Article · Jul 2006 · Kathmandu University Medical Journal