Use of serum cholesterol/triglyceride ratio to discern for which individuals the Friedewald formula can be used confidently

1990 ◽  
Vol 36 (9) ◽  
pp. 1673-1675 ◽  
Author(s):  
M González Estrada ◽  
C R Rodríguez Ferrer ◽  
I R Astarloa ◽  
E M Lahera

Abstract The values of low-density lipoprotein cholesterol obtained according to the Friedewald formula (Clin Chem 1972; 18:499-502), or by the De Long transformation (J Am Med Assoc 1986;256:2372-7), were compared with the values obtained when the individual cholesterol/triglyceride ratio of very-low-density lipoprotein was used for estimating the contribution of this lipoprotein to the total cholesterol. We found that these formulas gave the greatest errors for individuals with a low serum cholesterol/triglyceride ratio. We propose criteria for deciding when the numerically calculated value of low-density cholesterol is appropriate, and when it is not.

1994 ◽  
Vol 40 (4) ◽  
pp. 571-573 ◽  
Author(s):  
K M Li ◽  
D E Wilcken ◽  
N P Dudman

Abstract The calculation of serum low-density lipoprotein cholesterol (LDL-C) by the Friedewald formula does not account for the cholesterol associated with lipoprotein(a) [Lp(a)]. To quantify the contribution of Lp(a) cholesterol to total serum cholesterol, we measured concentrations of serum Lp(a) by an ELISA and concentrations of other serum lipids and lipoproteins by standard assays in 23 normolipemic women, ages 50-60 years. In measuring serum high-density lipoprotein we found that polyethylene glycol 6000 precipitated > 99.8% of all Lp(a). When serum Lp(a) concentrations were < or = 300 mg/L, 301-600 mg/L, and > 600 mg/L, the uncorrected serum LDL-C was overestimated, respectively, by a mean of 4.1% (n = 7), 8.5% (n = 8), and 21.4% (n = 8). Serum Lp(a) concentrations were positively correlated with percentage overestimation (P < 0.001), but were not correlated with either corrected or uncorrected serum LDL-C. We conclude that the Friedewald formula should be modified to take into account the contribution of Lp(a) cholesterol to total serum cholesterol.


2020 ◽  
Vol 27 (02) ◽  
pp. 230-236 ◽  
Author(s):  
Shazia Bano ◽  
Syed Munawar Alam ◽  
Saima Iram

Objectives: To observe the association between dyslipidemia and homocysteine level in epileptic patients; especially on carbamazepine monotherapy. Study Design: Cross sectional study. Setting: Neurology Department and Epilepsy Centre of Jinnah Post Graduate Medical Centre, Karachi. Period: From January 2015 – January 2016. Material & Methods: Total 300 subjects, aged more than 15 years were included and divided into three groups.  Group A (100 healthy individuals) was control group, Group B (100 newly diagnosed epileptic patients without antiepileptic therapy), Group C (100 epileptic patients on Carbamazepine therapy, which was further subdivided into C-I (n=33) had epileptic patients on Carbamazepine therapy less than 1 year, C-II (n=33) comprised of epileptic patients on Carbamazepine therapy 1-2 years and C-III (n=33) had epileptic patients on Carbamazepine therapy more than 2 years. Serum lipid profile and homocysteine levels were measured. Results: In patients with different durations of carbamazepine monotherapy; a noteworthy incremental trend in the levels of homocysteine, total cholesterol, triglyceride, low density lipoprotein cholesterol, very low density lipoprotein cholesterol was observed. Homocysteine was found positively correlated with total cholesterol, triglyceride, low density lipoprotein cholesterol, very low density lipoprotein cholesterol. Conclusion: In our study dyslipidemia was associated with hyperhomocysteinemia, which in turn was correlated with atherosclerosis in CBZ treated epileptic patients.


2020 ◽  
Vol 27 (02) ◽  
pp. 230-236
Author(s):  
Shazia Bano ◽  
Syed Munawar Alam ◽  
Saima Iram

Objectives: To observe the association between dyslipidemia and homocysteine level in epileptic patients; especially on carbamazepine monotherapy. Study Design: Cross sectional study. Setting: Neurology Department and Epilepsy Centre of Jinnah Post Graduate Medical Centre, Karachi. Period: From January 2015 – January 2016. Material & Methods: Total 300 subjects, aged more than 15 years were included and divided into three groups.  Group A (100 healthy individuals) was control group, Group B (100 newly diagnosed epileptic patients without antiepileptic therapy), Group C (100 epileptic patients on Carbamazepine therapy, which was further subdivided into C-I (n=33) had epileptic patients on Carbamazepine therapy less than 1 year, C-II (n=33) comprised of epileptic patients on Carbamazepine therapy 1-2 years and C-III (n=33) had epileptic patients on Carbamazepine therapy more than 2 years. Serum lipid profile and homocysteine levels were measured. Results: In patients with different durations of carbamazepine monotherapy; a noteworthy incremental trend in the levels of homocysteine, total cholesterol, triglyceride, low density lipoprotein cholesterol, very low density lipoprotein cholesterol was observed. Homocysteine was found positively correlated with total cholesterol, triglyceride, low density lipoprotein cholesterol, very low density lipoprotein cholesterol. Conclusion: In our study dyslipidemia was associated with hyperhomocysteinemia, which in turn was correlated with atherosclerosis in CBZ treated epileptic patients.


Author(s):  
Samatha Tulla ◽  
Syeda Ayesha Siddiqua

Background: Lipid and lipoprotein levels are interrelated with diabetes mellitus. Abnormalities in the levels of total cholesterol (TC) or triglycerides (TAG) or low-density lipoprotein (LDL) cholesterol or very-low-density lipoprotein (VLDL) cholesterol or high-density lipoprotein (HDL) cholesterol or lipoprotein (a) [Lp (a)] is traditionally named as dyslipidemia. Diabetes mellitus has been known to be associated with lipid disorders and cardiovascular diseases. In patients with diabetes mellitus, dyslipidemia occurs earlier in life, leading to increased morbidity and mortality rates. The study aims to assess the changes in lipids and lipoprotein levels in uncomplicated diabetes mellitus patients.Methods: A case-control type of study was conducted for 18 months (September 2011 to March 2013) at the Department of General Medicine, Shadan Hospital, Hyderabad. Ethical committee approval was taken before the study from the institutional ethical committee. A total of 120 subjects, 60 non-diabetic (healthy) control subjects with matching age and gender and, 60 cases of subjects with uncomplicated diabetes mellitus were enrolled based on predetermined inclusion and exclusion criteria.Results: This study was conducted to evaluate the changes in lipids and lipoprotein levels between control (normal and healthy subjects) and case (subjects with uncomplicated diabetes mellitus) groups. The Mean±SD levels of total cholesterol, triglycerides, low-density lipoprotein cholesterol, very-low-density lipoprotein cholesterol, and lipoprotein (a) were higher in the cases group and showed statistical significance when compared with the control group.Conclusions: Our study states that there are abnormal levels of lipids and lipoprotein in subjects with uncomplicated diabetes mellitus, which is the foremost cause of cardiovascular diseases, coronary heart disease, dyslipidemia, etc.


2020 ◽  
pp. 263246362097804
Author(s):  
Rejitha Jagesh ◽  
Mathew John ◽  
Manju Manoharan Nair Jalaja ◽  
Tittu Oommen ◽  
Deepa Gopinath

Objectives: The accurate and precise measurement of low-density lipoprotein-cholesterol (LDL-C) is important in the assessment of atherosclerotic cardiovascular disease risk (ASCVD) in people with diabetes mellitus. This study aimed at comparing directly measured LDL-C with Friedewald formula (FF)-calculated LDL-C (c-LDL-C) in people with type-2 diabetes. Methods: Fasting lipid profiles of 1905 people with type-2 diabetes, whose LDL-C was estimated by direct LDL assay, were chosen for the study. In the same group, LDL-C was calculated with FF. Correlation and agreement between these methods were analyzed at various strata of triglycerides (TGs). The possibility of misclassifying people at various levels of LDL-C targets proposed in literature was calculated. Results: The mean LDL-C levels were lower in the c-LDL-C group across various TG strata. A significant correlation was found between c-LDL-C and direct LDL-C for all the study samples ( r = 0.948, P < .001) and across all TG strata. Analysis of agreement showed a positive bias for direct LDL-C which increased at higher strata of TGs. c-LDL-C underestimated ASCVD by misclassifying people at various LDL-C target levels. Conclusion: There is a difference between direct LDL-C and c-LDL-C values in people with diabetes and this may result in misclassifying ASCVD especially at lower levels of LDL-C and higher levels of TGs.


Author(s):  
Agnieszka Ćwiklińska ◽  
Ewa Wieczorek ◽  
Anna Gliwińska ◽  
Marta Marcinkowska ◽  
Monika Czaplińska ◽  
...  

Abstract Objectives Low-density lipoprotein cholesterol (LDL-C) is the main laboratory parameter used for the management of cardiovascular disease. The aim of this study was to compare measured LDL-C with LDL-C as calculated by the Friedewald, Martin/Hopkins, Vujovic, and Sampson formulas with regard to triglyceride (TG), LDL-C and non-high-density lipoprotein cholesterol (non-HDL-C)/TG ratio. Methods The 1,209 calculated LDL-C results were compared with LDL-C measured using ultracentrifugation-precipitation (first study) and direct (second study) methods. The Passing-Bablok regression was applied to compare the methods. The percentage difference between calculated and measured LDL-C (total error) and the number of results exceeding the total error goal of 12% were established. Results There was good correlation between the measurement and calculation methods (r 0.962–0.985). The median total error ranged from −2.7%/+1.4% (first/second study) for Vujovic formula to −6.7%/−4.3% for Friedewald formula. The numbers of underestimated results exceeding the total error goal of 12% were 67 (Vujovic), 134 (Martin/Hopkins), 157 (Samspon), and 239 (Friedewald). Less than 7% of those results were obtained for samples with TG >4.5 mmol/L. From 57% (Martin/Hopkins) to 81% (Vujovic) of underestimated results were obtained for samples with a non-HDL-C/TG ratio of <2.4. Conclusions The Martin/Hopkins, Vujovic and Sampson formulas appear to be more accurate than the Friedewald formula. To minimize the number of significantly underestimated LDL-C results, we propose the implementation of risk categories according to non-HDL-C/TG ratio and suggest that for samples with a non-HDL-C/TG ratio of <1.2, the LDL-C level should not be calculated but measured independently from TG level.


2021 ◽  
Vol 23 (3) ◽  
pp. 411-416
Author(s):  
I. M. Bilai ◽  
M. I. Romanenko ◽  
D. H. Ivanchenko

Statin side effects are not a rare occurrence, in particular dyspeptic disorders, insomnia, headache, skin erythema, rash are often noted. All of this determines scientists to find new effective and low-toxic hypolipidemic agents. Various natural and synthetic xanthine derivatives have been recognized as therapeutically potential compounds and reported to control various diseases. Therefore, the study of new xanthine derivatives and their hypolipidemic effects, which would have a significant therapeutic effect with minimal side effects, is relevant. The aim of the study was to examine the effect of 7-β-hydroxy-γ-aryloxypropylxanthinyl-8-thioalkanic acid derivatives on lipidogram parameters in experimental laboratory rats. Materials and methods. The objects of the study were 7-β-hydroxy-γ-aryloxypropylxanthinyl-8-thioalkanic acid derivatives. The experiments were performed in white laboratory Wistar rats weighing 180–220 g. Experimental modeling of hyperlipidemia – tween model: intraperitoneal administration of tween-80 at a dose of 200 mg/100 g body weight. The test compounds were administered orally, simultaneously with tween, at a dose of 1/10 of LD50 (previously calculated by Prozorovsky express method) for 6 days. The following indicators of lipidogram were determined: total cholesterol (TC), high-density lipoprotein cholesterol (HDL cholesterol), low-density lipoprotein cholesterol (LDL cholesterol), triglycerides (TG) and atherogenic index of plasma: TC – HDL cholesterol / HDL cholesterol. The experiments were carried out with respect to Bioethical rules and norms. Results. The studies have shown data on the hypolipidemic activity of 7-β-hydroxy-γ-aryloxypropylxanthinyl-8-thioalkane acid derivatives. According to the conditional efficiency index Ʃ, which included the overall percentage of the following indicators – total cholesterol, low-density lipoprotein cholesterol and triglycerides, the leading compounds were 2439 (87.47 %), 6047 (82.30 %). The reference drug atorvastatin had a value of 82.98 %. Conclusions. The major compound was 2439 identified among all compared to the control group. The prospect of further research is a more detailed study on the ability of xanthine derivatives to exhibit hypolipidemic effects and to influence oxidative stress in various hyperlipidemic models.


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