- Pakistan is a developing country with limited resources and a high prevalence of dyslipidemia.
- Nigella sativa is a small plant originating in the Middle East and is found abundantly, growing wild in Egypt, Asiatic Turkey and the Balkan States.
- The seed extracts from this plant are used by herbalists in the treatment of several medical disorders including dyslipidemia.
OBJECTIVE:
To determine the effectiveness of the nigella sativa seed in the control of dyslipidemia in adults. This is a pilot study.
METHODOLOGY
DESIGN
Double blind, randomized, controlled trial
Inclusion Criteria:
- Adult (18 years or older) men and women who have serum cholesterol > 180 mgs/ dls
- Who consent to participate
Exclusion Criteria:
- Patients with known Diabetes Mellitus
Primary Endpoint
The primary end point for the trial is serum LDL cholesterol concentration measured at six weeks after intervention.
Secondary Endpoint
- Serum total cholesterol concentrations measured at six weeks after intervention
- Serum concentrations of HDL cholesterol measured at six weeks after intervention
- Serum concentrations of Triglyceride measured at six weeks after intervention
- Serum concentrations of Blood sugar measured at six weeks after intervention
- Changes in Serum Transminase and Serum Creatinine with six weeks of intervention
Intervention Group Recommended
- Dietary changes
- Lifestyle changes
- Nigella sativa seed as intervention.
Intervention details:
- Quantity: Two capsules of crushed nigella sativa seeds 500 mgs each
- Frequency: Twice daily
- Timing: After meals
- Duration: Six weeks
Control Group Recommended
- Dietary changes
- Lifestyle changes
- Capsules containing Calcium Lactate
Dietary Advice
Study subjects will receive advice from the Principal Investigator (PI)
- Eat low fat, low cholesterol foods
- Cut down on high fat food (fatty meats and bakery goods)
- Use low fat cooking methods (Use nonstick pans, barbecue, roast, boil)
- Avoid alcohol consumption
- Eat more fruits, vegetables and whole grains
- Subjects of both groups will be given standard low cholesterol diet sheet as well
Exercise
Subjects in both groups will be advised to take a brisk 30 minute walk for 5 days in a week on empty stomach or one hour after having a meal.
LABORATORY INVESTIGATIONS
For lab investigations venous blood specimens will be collected for the following tests. The tests will be performed on 12 hour fasting samples to assess the primary and secondary outcomes.
- Total Cholesterol
- Low Density Lipoprotein (LDL)
- High Density Lipoprotein (HDL)
Other investigations
- Triglycerides
- Fasting blood glucose (FBS)
- Creatinine SGPT (ALT)
IDENTIFICATION OF STUDY SUBJECTS
Study subjects will be identified from executive and family medicine clinics within AKUH. Individuals fulfilling the inclusion criteria will be informed about the study and asked to participate.
INFORMED CONSENT
- The participants will be informed of all possible expected benefits and possible harm ensuing from the study
- Written informed consent will be obtained from the study subjects addressing the ethical concerns of the relevant authority
RANDOMIZATION
- A randomized controlled design will be used for this trial
- Randomization will be done to give an equal chance to eligible subjects of being assigned to either group.
- A randomization plan with a block size of four will be used to assign subjects to the intervention and control groups
- This will be done in order to achieve an equal number of participants in both the groups
- A Co-Investigator will create subject identification numbers and assign group according to randomization.
FOLLOW-UP & DATA COLLECTION
- Baseline data including information on height, weight, blood pressure, blood sugar fasting, serum cholesterol, HDL, LDL, triglycerides and serum creatinine will be collected prior to starting intervention
- Subjects in both study groups will be telephoned, at an interval of 10 days by the study assistant to ensure patient compliance
- At the end of six weeks period, a fasting blood sample will be taken from the study subjects for measuring total cholesterol, LDL and HDL concentrations, serum triglycerides, blood sugar fasting and serum creatinine.
- A food diary combining groups of foods with similar nutrient content and dietary use will be given to study subjects
- Participants will record daily food intake initially and at the end of the trial period
- Patients' Body Mass Index (BMI), waist hip ratio and blood pressure will be recorded at baseline and at the end of the study.
ETHICAL ISSUES:
- Subjects in both groups of the study will be given standard dietary advice, which is recommended by National Cholesterol Education Program (NCEP) in cases fitting the inclusion criteria of this proposed study.
- In studies conducted previously, the nigella sativa seed has shown to demonstrate protective effects against nephrotoxicity and hepatotoxicity induced by either disease or chemicals.
- However, in case adverse events are observed, the intervention with nigella sativa will be stopped for that particular individual.
SAMPLE SIZE CONSIDERATIONS
This is a pilot study and will include 80 patients. Half will get N. Sativa seed capsules and the rest will get calcium lactate placebo capsules.
Analysis
- In descriptive statistics, comparison of the two treatment groups would be done on variables such as age and gender. The results will be mentioned in frequency and percentages.
- In univariate analysis t-test will be applied to detect a significant difference in the primary outcome between the two groups.
- For multivariate analysis, linear regression analysis will be used to identify variables associated with the primary outcome (LDL concentration), and to control for confounding factors. A similar process will be adopted for secondary outcome variables i.e., serum total cholesterol concentrations and HDL.
SITE
Aga Khan University Hospital (AKUH), Karachi