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RENAL DATA FROM THE ASIA - AFRICA |
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| Year : 2010 | Volume
: 21
| Issue : 3 | Page : 565-570 |
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| Pattern of lipid profile in patients on maintenance hemodialysis |
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Narinder Maheshwari1, Muhammad Rafique Ansari2, Muhammad Shahzad Laghari2, Darshana1, Kumar Lal1, Kamran Ahmed1
1 Department of Medicine, Liaquat University of Medical and Health Sciences (LUMHS), Jamshoro, Sindh, Pakistan
2 Department of Nephro-Urology, Liaquat University of Medical and Health Sciences (LUMHS), Jamshoro, Sindh, Pakistan
Click here for correspondence address and email
| Date of Web Publication | 26-Apr-2010 |
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 Abstract | | |
This hospital-based cross-sectional comparative observational study was performed to determine the pattern of lipid profile in patients on maintenance hemodialysis. The study was performed at the Department of Nephro-Urology, Liaquat University Hospital, Hyderabad, Pakistan from April 2008 to June 2008. Fifty patients with end-stage renal disease on maintenance hemodialysis (MHD) were studied. They comprised of 31 males and 19 females, the mean duration on HD was 7.58 ± 2.05 yrs, with frequency of two to three sessions per week and each session lasting for four hours. Additionally, 25 healthy volunteers (16 male, 9 female) were also studied. After obtaining informed, written consent, general information of each patient was recorded on the proforma. After 12-hours fasting, blood samples were drawn from the arterio-venous fistula before starting dialysis. The total cholesterol, triglyceride (TG) or low density lipoprotein (LDL) levels more than 95 th percentile for age and gender or high density lipoprotein (HDL) less then 35 mg/dL was defined as dyslipidemia. Descriptive and inferential statistical analysis were performed using SPSS version 16.0. The age among MHD and control groups was 47.88 ± 13.92 and 54.56 ± 11.16 years respectively. Serum TG and lipoprotein-a (LPa) were significantly increased (P= < 0.001 for each) while HDL-c was significantly lower (P= < 0.001) in MHD patients than in the control group. The serum cholesterol, LDL-c, VLDL-c and chylomicron levels were not significantly different in the two groups. Our study suggests that patients on MHD show abnormalities of lipid metabolism like hypertriglyceridemia, elevated lipoprotein-a and low HDL-c, which could contribute to atherosclerosis and cardiovascular disease that may increase the morbidity and mortality in these patients.
How to cite this article:
Maheshwari N, Ansari MR, Laghari MS, Darshana, Lal K, Ahmed K. Pattern of lipid profile in patients on maintenance hemodialysis. Saudi J Kidney Dis Transpl 2010;21:565-70 |
How to cite this URL:
Maheshwari N, Ansari MR, Laghari MS, Darshana, Lal K, Ahmed K. Pattern of lipid profile in patients on maintenance hemodialysis. Saudi J Kidney Dis Transpl [serial online] 2010 [cited 2020 Dec 2];21:565-70. Available from: https://www.sjkdt.org/text.asp?2010/21/3/565/62730 |
| Introduction | |  |
The incidence and prevalence of chronic kidney disease (CKD) are increasing worldwide. According to the 1998-2004 National Health and Nutritional Survey (NHANES), the prevalence of CKD in the US population is 15.3%. [1] Patients with CKD are in the highest risk category for coronary heart disease (CHD). [2] The incidence of cardiovascular disease (CVD) is high in patients on hemodialysis (HD). [3]
Approximately 50% of patients with end-stage renal disease (ESRD) die from cardiovascular events, [4] which indicates that cardiovascular mortality is 30-times higher in dialysis patients. The Kidney Dialysis Outcome Quality Initiative (K/DOQI) guidelines state that patients on MHD with fasting triglycerides (TG) > 5.65 mmol/L, low density lipoprotein (LDL) > 2.59 mmol/L and non-HDL cholesterol >3 .36 mmol/ L, should be considered for treatment to reduce the cardiovascular complications in these patients. [5] Dyslipidemia has been established as a well known traditional risk factor for CVD in the general population as well as in CKD patients on maintenance HD. CKD is known to cause an increase in triglycerides and a decrease in high-density lipoprotein that mimic the lipid abnormalities of the metabolic syndrome, which accelerate the progresssion of CKD and increase the risk for cardiovascular mortality.
Hemodialysis patients usually display elevated TG, reduced serum high density lipoprotein (HDL) cholesterol and elevated concentration of lipoprotein-a (LP-a). Total and LDL cholesterol levels usually remain within normal limits. [6] Cholesterol levels may be lower in MDH patients. There is an inverse relationship between mortality and the cholesterol concentration. [7] This pattern of reverse epidemiology, i.e., hypercholesterolemia associated with decreased mortality and low cholesterol concentration associated with increased CVD mortality seen in MHD patients has been related to the malnutrition-inflammation-atherosclerosis complex. [8],[9] Keeping in view the mortality associated with CVD in patients on HD, we investigated the serum lipid status in CKD patients undergoing long-term maintenance HD treatment and compared the values with healthy subjects. Additionally, LP-a levels were also investigated as an independent risk factor of CVD in these patients.
| Patients and Methods | | |
This cross sectional comparative observational study was conducted at the Department of Nephro-Urology, Liaquat University Hospital, Hyderabad, Pakistan. Fifty patients with CKD, who were on maintenance HD treatment were studied. There were 31 males and 19 females; their mean duration on HD treatment was 7.58 ± 2.05 yrs, with frequency of two to three times per week and each session of HD treatment lasting for four hours. Additionally, 25 healthy volunteers (16 male and 9 female) who had no history of hematological or renal disease, were included in the study. After they were informed about the study, written consent was obtained. General information of each patient (age, sex, BMI, duration and frequency of HD, underlying renal disease, and family history of hypertension, hyperlipedemia and myocardial infarction) were recorded. Patients were dialyzed with volumetric dialyzer machines, bicarbonate buffer-based dialysate with blood flow of 250 mL/min and dialysate flow of 500 mL/ min. All patients were dialyzed using 1.6 m 2 surface area hollow fiber polysulfone membrane dialyzers. Patients taking diuretics, lipid lowering agents as well as those with acute or chronic infection were excluded from the study. After 12-hours of fasting, blood samples of patients were drawn from the AV fistula before starting dialysis for lipid profile analysis which included total cholesterol, serum triglycerides (TG), high density lipoprotein (HDL) cholesterol, low density lipoprotein (LDL) cholesterol, very low density lipoprotein (VLDL) cholesterol, and LP-a. Total cholesterol, TG, HDL were measured by electrophoresis method and if TG was less than 400 mg/dL, LDL and VLDL were derived from Friedwald's formula. [10] (LDLC=TC-(HDL-C+TG/2.2). Lipoprotein electrophoresis was performed for LP-a by enzyme linked immune assay (ELISA) with immunobiological laboratories (IBL) kit of Germany. Serum magnesium, creatinine, blood urea, serum calcium, and serum phosphorus were measured using standard methods. In the control group, blood samples were collected from the cubital vein after 12-hours fasting. For each patient, total cholesterol, TG or LDL levels more then 95 th percentile for age and gender or HDL less then 35 mg/dL was defined as dyslipedemia.
| Statistical Analysis | | |
The data were analyzed in statistical program SPSS version 16.0. Frequencies and percentages of categorical parameters were computed on 95% confidence interval and Pearson chi square test was used for BMI parameter which was recoded and categorized into four groups. Student's t test was applied for numerical variables of investigations. P value ≤ 0.05 was considered as significant level.
| Results | | |
Seventy five subjects, 50 in the maintenance hemodialysis (MHD) group and 25 in the control group were studied. There were 31 males (62%) and 19 females (38%) in the MHD group, and 16 males (64%) and nine females (36%) in the control group [Table 1]. Age among MHD and control groups were 47.88 ± 13.92 and 54.56 ± 11.16 years respectively. The mean duration on HD among the MHD patients was 7.58 + 2.05 years, with frequency of twice weekly in 42 (88%) and thrice weekly in eight patients (16%).
The MHD patients had lower BMI compared with the control group; mean (SD) 19.83 ± 4.05 vs. 22.21 ± 3.8 [Table 2]. The mean hemoglobin among MHD patients and control groups was 10.45 + 1.47 and 13.43 + 2.06 gm/ dL. Among MHD patients, the mean urea was 118.64 + 45.1 mg/dL and creatinine was 7.67 + 3.53 mg/dL [Table 1]. The serum triglyceride and LP-a levels were significantly higher in MHD patients than in the control group (P=< 0.001 for each), while HDL-c was significantly lower in MHD patients compared to control group (P= <0.001). The serum cholesterol, LDL-c, VLDL-c and chylomicron levels were not significantly different in the two groups. The most common abnormality observed among MHD patients was low HDL cholesterol followed by increased serum triglycerides and LP-a levels [Table 3].
The etiology of CKD among MHD patients was diabetes mellitus in 15 (30%), hypertension in 11 (22%), both hypertension and diabetes mellitus in six (12%), ADPKD in four (8%), analgesic nephropathy, obstructive nephropathy and idiopathic in three patients each (6%), primary glomerular disease and chronic pyelonephritis in two patients each (4%) and renal artery stenosis in one patient (2%) [Figure 1], [Table 4].
| Discussion | | |
In our study, the pattern of dyslipedemia in ESRD patients on MHD showed hypertriglyceridemia, elevated LP-a and reduced HDL-c. Also, patients on MHD treatment had significantly low BMI as compared to control group, a finding that has been observed in several other studies [11],[12] About 48% of the patients on MHD, in our study, had BMI < 18.5 kg/m 2 ; this indicates increased prevalence of malnutrition in our patients according to WHO guidelines for adults. [13] In our study, 42% were of normal weight, 8% were over weight and 2% were obese in the MHD group. In contrast, Tourn et al reported that 59% had normal weight, 24% were over weight and 17% were obese in their MHD patients. [14] This indicates that our patients are more malnourished as compared to their western counterparts.
In our study, the serum triglyceride levels were found to be significantly higher in MHD patients as compared to control group. Similar hypertriglyceridemia was also observed in several other studies including the CHOICE study. [15],[16],[17],[18]
The second most common lipid abnormality in our study was low HDL-c level as compared to healthy volunteers. HDL-C was similarly found to be low in MHD patients by Pennell P et al [17] and in the CHOICE study. [18] Piperi C et al [19] also reported significantly low HDL-c level in their study. Total cholesterol, LDL-c, VLDL-c and chylomicrons were not significantly different between the patient and control groups.
We also observed elevated levels of LP-a in MHD patients as compared to the control group. Lipoprotein-(a) is an independent risk factor for cardiovascular disease. [20],[21] Liu J et al [22] have suggested that increased levels of LP-a is highly atherogenic. Kaysen GA [23] also reported elevated LP-a levels in patients with kidney disease, which was associated with cardiovascular events among their dialysis patients.
Routine counseling and encouraging physical activity in MHD patients has potential to improve physical functioning, optimizing the quality of life [24] and possibly improving the plasma lipids and lipoprotein pattern. Our study indicates that if we apply regular exercise program in our dialysis patients, we can achieve improvement in lipid and lipoprotein levels.
| Conclusion | | |
Our results indicate that patients undergoing MHD show important abnormalities of lipid metabolism such as hypertriglyceridemia, elevated LP-a and low HDL-c, which could contribute to atherosclerosis and cardiovascular disease and may increase the morbidity and mortality in this group. As a first step of controlling hyperlipidemia, body weight normalization, dietary modification, regular exercise and education about diet should be applied. It may also be useful to supplement the diet with polyunsaturated fatty acids from fish oil in order to reduce triglycerides. Fibrates are not recommended in patients with renal failure, because of their renal excretion. Statins can be used safely in patients with CKD with careful monitoring. They reduce plasma LDL cholesterol by approximately 25-40%.
| References | | |
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Correspondence Address:
Muhammad Rafique Ansari
Department of Nephro-Urology, Liaquat University of Medical and Health Sciences (LUMHS), Jamshoro, Sindh
Pakistan
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PMID: 20427895 
[Figure 1]
[Table 1], [Table 2], [Table 3], [Table 4] |
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