- Research article
- Open Access
No significant improvement of cardiovascular disease risk indicators by a lifestyle intervention in people with Familial Hypercholesterolemia compared to usual care: results of a randomised controlled trial
BMC Research Notes volume 5, Article number: 181 (2012)
People with Familial Hypercholesterolemia (FH) may benefit from lifestyle changes supporting their primary treatment of dyslipidaemia. This project evaluated the efficacy of an individualised tailored lifestyle intervention on lipids (low density lipoprotein cholesterol (LDL-C), high density lipoprotein cholesterol (HDL-C), total cholesterol (TC) and triglycerides), systolic blood pressure, glucose, body mass index (BMI) and waist circumference in people with FH.
Adults with FH (n = 340), recruited from a Dutch cascade screening program, were randomly assigned to either a control group or an intervention group. The personalised intervention consisted of web-based tailored lifestyle advice and personal counselling. The control group received care as usual. Lipids, systolic blood pressure, glucose, BMI, and waist circumference were measured at baseline and after 12 months. Regression analyses were conducted to examine differences between both groups.
After 12 months, no significant between-group differences of cardiovascular disease (CVD) risk indicators were observed. LDL-C levels had decreased in both the intervention and control group. This difference between intervention and control group was not statistically significant.
This project suggests that an individually tailored lifestyle intervention did not have an additional effect in improving CVD risk indicators among people with FH. The cumulative effect of many small improvements in all indicators on long term CVD risk remains to be assessed in future studies.
NTR1899 at ww.trialregister.nl
Familial hypercholesterolemia (FH) is an autosomal dominant disorder of the lipoprotein metabolism. Due to a defect of the low density lipoprotein (LDL) receptor gene, plasma concentrations of LDL cholesterol (LDL-C) are elevated . In the Netherlands, approximately one in 500 people is affected with the heterozygous type of FH . Elevated serum LDL-C and therefore FH is associated with an elevated risk of premature cardiovascular disease (CVD), which is the disease with the highest burden in disability adjusted life years in the Netherlands . If elevated LDL-C is not diagnosed and treated, the cumulative risk of developing coronary artery disease (CAD) by the age of 60 years is over 60% for men, and over 30% for women . Large primary and secondary prevention trials with statins have clearly demonstrated the benefit of reducing LDL-C in subjects with high LDL-C [6, 7]. Also, Versmissen and colleagues showed an overall risk reduction in a large cohort (n = 2146) of people with FH that used statins . Still, significant CVD risk persists despite effective LDL-C lowering statin treatment .
Apparently, lifestyle factors can play an important role in moderating the course of this disorder [10, 11], as is underlined by the EUROASPIRE III survey, conducted in 2006–2007 in 22 European countries. This survey showed a high prevalence of unhealthy lifestyles among CVD patients treated by cardiologists, and moreover, that use of medication was often inadequate to achieve treatment goals . Results of primary prevention trials in high-risk persons and secondary prevention trials in CVD patients both show that substantial reductions in the CVD risk can be obtained through lifestyle changes [13, 14]. For example, the INTERHEART study showed that eating fruit and vegetables daily, being physically active regularly and avoiding smoking were effective in reducing the risk of a myocardial infarction by 80% . Estimates from a study by Hopkins suggested that a cholesterol-lowering diet could reduce LDL-C levels by up to 21% in people with heterogeneous FH . Clearly, a healthy lifestyle is an aspect of the treatment of FH with benefits beyond LDL-C-lowering drugs . FH treatment should not merely focus on LDL-C, but also on a larger spectrum of risk factors . We therefore assumed that raised awareness of the actual CVD risk, improved lifestyle behaviours and improved compliance to statin therapy is a promising strategy in reducing CVD risk in people with FH.
In the PRO-FIT project, we developed an individually tailored lifestyle intervention aimed at a CVD risk reduction in individuals with FH. At first, we investigated the efficacy of the intervention on smoking, physical activity, dietary intake and compliance to statin therapy (Broekhuizen K, Msc, unpublished data, 2011). In this paper, we report the efficacy on biological CVD risk indicators: lipids (LDL-C, HDL-C, TC and triglycerides), systolic blood pressure, glucose, body mass index (BMI) and waist circumference.
Design and participants
A randomised controlled trial was conducted with measurements at baseline and at 12 months post-baseline. Participants diagnosed with FH from January 1st 2007 to April 15th 2009, aged from 18 to 70 years and with a LDL-C level > 75th percentile (age and gender specific) were recruited from the national cascade screening programme of the Foundation for the Identification of Persons with Inherited Hypercholesterolemia (StOEH). Access to internet, sufficient fluency in Dutch and residency <150 km radius from Amsterdam were additional eligibility criteria. Invitation brochures were send to 986 people, of whom 321 (32%) responded and agreed to participate. An additional 23 participants were recruited through brochures that were distributed among family members of participants, meeting the same eligibility criteria. The recruitment period lasted 6 months and resulted in 340 participants. Three hundred and fifteen participants (93%) attended the baseline and follow-up measurements.
Details on the participant flow can be found in Figure 1. The content of this paper was guided by the recommendations for reporting randomised controlled trials of the CONSORT (Consolidated Standards of Reporting Trials) statement . The ethical principles of the Helsinki Declaration were followed and the PRO-FIT project was approved by the Medical Ethics Committee of the VU University Medical Centre. All participants gave written informed consent.
Participants were randomly assigned to either the no-intervention control group (n = 159) or the intervention group (n = 181) through a stratified computerised randomisation procedure using Microsoft© Office Access 2003 software. Randomisation was concealed. At first, participants were stratified according to cholesterol lowering medication use (yes/no), assuming that medication use implicates treatment by a general practitioner and/or medical specialist, who could have already given advice on lifestyle behaviour. In addition, we expected that a decrease in LDL-C because of the intervention would be smaller if a participant already used medication. Family members of the same household were clustered and subsequently randomised as a cluster to prevent contamination of the intervention effect due to spill over of communication about the intervention among family members.
The intervention of the PRO-FIT project was developed according to the integrated model for exploring motivational and behavioural change, the I-Change model (2.0) [20, 21]. Briefly, it assumes that the behavioural change process can be distinguished in three phases: 1) Awareness, 2) Motivation and 3) Action. Hypothetically, due to gained knowledge and awareness of one’s CVD risk, a participant will become motivated to change lifestyle behaviour(s), and subsequently, implementation intentions and action plans will be formed to actually achieve (maintenance of) behavioural change. In addition, it is assumed that this will eventually lead to a reduction in CVD risk. The assumed pathway is illustrated in the I-Change model (2.0) in Figure 2.
The intervention consisted of a personalised health counselling intervention; a combination of computer-generated tailored web-based advice (PRO-FIT*advice) and face-to-face counselling complemented with telephone booster sessions (PRO-FIT*coach). The goal was to: 1) improve awareness of the cardiovascular disease risk through an increase of specific knowledge, cues to action and change in risk perception, 2) improve motivation with respect to healthy behaviour through an increase of specific knowledge and a change in attitude, self-efficacy and social influences, 3) adopt and maintain a healthier lifestyle, with regard to physical activity, saturated fat intake, fruit and vegetables intake, smoking and compliance to statin therapy, and 4) lower the level of LDL-C and other biological CVD risk indicators and thereby reducing the CVD risk.
The intervention has been described in detail elsewhere . Briefly, participants were encouraged to visit a web link referring to the project website, where generic online CVD risk information was presented, containing feedback on CVD risk behaviours and their contribution to overall CVD risk, as well as information on the changeability of these behaviours and cues on how to change behaviours. Thereafter, participants could log on to a personal PRO-FIT*advice account, consisting of six tailored advice modules on smoking, physical activity, saturated fat intake, fruit intake, vegetables intake and compliance to statin therapy. On-screen computer-generated personalised feedback was tailored to personal performance level (current lifestyle behaviour), awareness of one’s own performance, as well as personal motivation to change, outcome expectations, attitude and self-efficacy. Personalised feedback on compliance to statin therapy was tailored to knowledge and personal beliefs about (the effect of) statin therapy, potential side effects of the prescribed drug and current compliance.
Subsequently, a month later, the participant and the personal coach further established the level of the participant’s knowledge/awareness about FH and cardiovascular risk factors. Furthermore, the assessment(s) and advice(s) within the participant’s personal PRO-FIT*advice account were discussed and ambivalence and barriers related to the recommended behaviour changes were explored based on Motivational Interviewing (MI) techniques . Further, one to five counsellor-initiated booster telephone sessions were performed during a period of 9 months to encourage the participant’s behavioural changes and to provide further brief motivational interviewing to encourage the planned behavioural changes.
The control group received care as usual.
In this project, lipids (LDL-C, HDL-C, TC and triglycerides), systolic blood pressure, glucose, BMI and waist circumference were defined as CVD risk indicators, also known as classical CVD risk factors, as reported by the Adult Treatment Panel (ATP) III of the NCEP, that formulated an evidence-based set of guidelines of cholesterol management for the general population . These classical risk factors also contribute to the CVD risk in people with FH .
All CVD risk indicators were measured at the participants’ homes. LDL-C, HDL-C and TC, triglycerides and glucose were measured with fasting finger stick samples analysed on a Cholestech LDX desktop analyser (Cholestech, Hayward, USA). This portable analyser is capable of providing a lipid profile and glucose in approximately 5 minutes. The reproducibility and precision of lipids measurement by the LDX analyser are within the guidelines of the NCEP [25, 26]. The Cholestech LDX analyser has been validated for point-of-care lipid measurements in clinical practice . Systolic and diastolic blood pressure (in mmHg) was measured twice with a fully automated blood pressure monitor (type: Omron M5-I). The mean value of the two measurements was computed.
Body height (in cm) was measured on bare feet with a portable device with a wide measuring slide and a heel plate. Calibrated scales were used to determine body weight (in kg) while participants wore light clothing only (e.g. underwear). Both body weight and height were measured twice, and the mean value of the two measurements was used to calculate BMI. Waist circumference (in cm) was measured twice with a measurement tape to the nearest 0.10 cm, at the midpoint between the lower border of the ribs and the upper border of the pelvis. The mean value of the two measurements was computed.
A process evaluation was carried out, taking into account the process elements reach, dose (delivered and received) and fidelity . In short, reach (the number of people included in the project, as well as their representativeness for the study population and non-participants) was assessed by consulting the StOEH/PRO-FIT client database. The dose of all delivered elements of the intervention was assessed by logs that were kept by the coaches and the project database. Dose received, i.e. the way participants used PRO-FIT*advice (% of participants that logged on, number of modules finished), was assessed by means of log on rates and website use data. Whether face-to-face counseling sessions were implemented as planned according to Motivational Interviewing (MI) guidelines (fidelity) was assessed by two MI experts, following the MI Treatment Integrity code 3.1.1 . For this assessment, a random sample of 20 audio taped counselling sessions (10 sessions of each lifestyle coach; approximately 10% of all sessions) was drawn. A verbatim transcript  of each drawn session was evaluated and resulted in two scores: a global score, capturing an overall impression of the conversation on a 5-point Likert scale on the following 5 dimensions: Evocation, Collaboration, Autonomy/Support, Direction and Empathy. In addition, specific behaviours of the lifestyle coach, such as the number of open/closed questions and simple/complex reflections (reflective statements made by the counsellor in response to participant, without/with additional meaning or emphasis to what the participant has said) were counted. Counselling sessions were considered MI if the average of global scores was ≥ 3.5, reflection to question ratio was in favour of reflection, >50% of the questions were open questions, >40% of the reflections were complex reflections and >90% of all utterances was MI-adherent .
Potential baseline differences were checked between intervention and control group, regarding gender, age, education, BMI, medication use and LDL-C. In case of baseline differences between intervention and control group, the concerned covariate was included in the analyses. In addition, differences between dropouts and participants regarding the above-mentioned baseline characteristics were tested by linear regression analyses.
Primary, a complete case analysis was conducted at the participant level, restricted to those who attended baseline and follow-up measurements. These numbers vary for different outcome measures. Subsequently, an intention-to-treat analysis was conducted, involving all participants who were randomly assigned (n = 340). Missing data on lipids (LDL-C, HDL-C, TC and triglycerides), systolic blood pressure, glucose, BMI and waist circumference were imputed using multiple imputations. Five different datasets were created in SPSS (version 18.0) using Fully Conditional Specification and Predictive Mean Matching procedures. All available data on the above-mentioned outcomes, as well as on group allocation, gender, age, education, BMI, medication use and LDL-C were included in the imputation model. Thereafter the multiple datasets were analysed as described below, using SPSS (version 18.0). Pooled estimates were computed following the rules as described by Rubin . As no major differences were found, only the results of the complete case analysis are presented.
In order to investigate whether this intervention had an effect on lipids (LDL-C, HDL-C, TC and triglycerides), systolic blood pressure, glucose, BMI and waist circumference, linear regression analyses were conducted to detect between group differences after 12 months (two-sided; significance level 0.05). The post-test scores were regressed on study group and baseline measure of the outcome variable.
Baseline characteristics of participants
In Figure 1 the recruitment, participant and retention flow is presented. As can be seen from Table 1, the participants were equally distributed with regard to gender. Overall, a mainly middle aged, medium to highly educated, fairly overweight and the majority has an elevated LDL-C and used cholesterol-lowering medication. Baseline differences between the control and intervention group were found for BMI (β = −1.10; CI −2.17- −0.04). As a consequence, this variable was included in the regression analyses as a potential confounder. No differences were found between dropouts and participants regarding the baseline characteristics.
Effect on biological risk indicators
After 12 months, LDL-C had decreased in both the intervention and control group (see Table 2). No significant between-group difference was found, as well as for HDL-C, TC, triglycerides, systolic blood pressure, glucose, BMI and waist circumference. Both groups showed no major changes in HDL and a slight decrease of TC and glucose. A minor increase of triglycerides was seen in the intervention group, in contrast to a decrease in the control group. In the control group, no change in BMI was observed after 12 months, compared to a decrease in the intervention group. Waist circumference did not change in the control group and decreased in the intervention group.
A 34% (n = 181) representative proportion of the intended intervention group was reached during the recruitment phase; participants did not differ from non-participants (n = 623) in the StOEH client database on age, gender and LDL-C levels. Of the participants, 95% received a PRO-FIT*advice log on account, of which 49% actually logged on and completed at least one advice module. Nearly all participants received a face-to-face counseling session and on average, 4.2 telephone booster calls were delivered. None of the face-to-face sessions were implemented according to MI guidelines.
In this paper, the efficacy of an individually tailored lifestyle intervention on lipids (LDL-C, HDL-C, TC and triglycerides), systolic blood pressure, glucose, BMI and waist circumference in people with FH was investigated. After 12 months, LDL-C levels had decreased in both the intervention and control group. This difference between intervention and control group was not statistically significant. Furthermore, the LDL-C concentrations in both groups did not result in reaching the recommended treatment target concentration of ≤2.5 mmol/l for most participants . Based on a comparable population, Huijgen and colleagues also concluded that only a minority of the medication users reaches LDL-C treatment targets within two years after screening .
Overall, we also did not observe any significant intervention effects on HDL-C, TC, triglycerides, systolic blood pressure, glucose, BMI and waist circumference. However, it may be that the collective contribution of all these small improvements together is cumulative, and larger than the CVD risk reduction associated with a single risk indicator. But since to date, no CVD risk prediction tool is available for FH populations, it is impossible to have an accurate estimate of the CVD risk reduction from all the small improvements together. Such a CVD risk prediction tool would be beneficial for the interpretation of our results. Moreover, it would be possible to identify people with severely increased CVD risk. Several CVD risk estimates are available, such as the risk assessment tool that uses data from the Framingham Heart Study to estimate 10-year risk for hard coronary heart disease outcomes . However, these tools are based on calculations in a non-FH reference population, and it is known that classical risk factors in a FH population do not necessarily play the same role with the same intensity . Civeira proposed a risk assessment tool, dividing people with FH in three risk categories: low-moderate-high 10 year CVD mortality risk . However, lipoprotein-A and carotid intima media thickness, defined as major risk factors by Civeira, were not assessed in this project.
Participants who were not on statin treatment had notably higher LDL-C and TC levels at baseline, and according to post-hoc analyses, reductions in LDL-C and TC concentrations were most obvious among participants who used no statins (data not shown). Clearly, a reduction in lipids levels is most expected among this subsample, since more reduction of lipid levels can be achieved. However, due to the small subsample (n = 72), this finding should be interpreted with great caution.
We did not find any significant intervention effects on all targeted lifestyle behaviours in the PRO-FIT project (data not shown). We can not confirm nor reject whether small improvements of biological CVD indicators were caused by behavioural improvements. The lack of intervention effects on biological CVD risk indicators and lifestyle behaviours found in the PRO-FIT project are not in accordance with the latest evidence, as in a literature review, Blokstra et al. showed that multifactorial lifestyle interventions could have favorable effects among individuals with a high CVD risk: improvements in blood pressure (−2-4 mmHg), nutrition, physical activity and smoking (−25-40%) were found . Studies on other high-risk populations also showed that biological changes can be achieved, though often small and not significant at a long term (> 6 months) [35, 36]. However, the above-mentioned studies did not include FH subjects. In a recent review of Shafiq (2011), no differences were reported between cholesterol-lowering diet in comparison with no intervention or other dietary interventions in people with FH .
It may be that the intervention reach and dose received were insufficient to initiate behaviour changes and, subsequently, changes in CVD indicators. Our process evaluation indicates that participants were sufficiently exposed to the intervention. However, only half of the participants logged on at the PRO-FIT*advice website and completed at least one of the advice modules, and face-to-face counselling sessions were delivered with low MI fidelity.
More in-depth analysis showed weak and positive associations between dose and LDL-C change for all intervention components (data not shown). Due to the small sample of audio taped sessions (n = 20), the association between MI fidelity and efficacy could not be tested in this study, but previous studies showed that a better MI performance is associated with larger intervention effects [22, 38]. Also, mixed evidence has been published on computer-tailored interventions addressing more than one lifestyle behaviour. It is possible that multiple-behaviour interventions may be burdensome for some individuals, and advices may be too long [39–41]. Overall, it is possible that the poor MI fidelity and dose of PRO-FIT*advice received contributed to the lack of efficacy. Probably, the provided MI workshop was not sufficient and more thorough monitoring and supervision of counselling skills during the intervention should have been built in, as it has often been reported that skills required for effective MI may take longer to develop than the 3-day MI workshop in our project [42, 43].
The strengths of this project include the randomised design, which avoided study contamination that could have resulted from individual changes of participants in both intervention and control group. To our knowledge, the PRO-FIT intervention is the first to evaluate the effects of a lifestyle intervention on multiple lifestyle behaviours and CVD risk indicators among people with FH. The RCT was conducted in a sample representative for the screened FH population in the Netherlands with a small dropout rate. However, the recruitment rate of our study was only 34% and contained a self-selected sample of mainly medium-educated participants with internet access and sufficient fluency in Dutch. Although no differences on age, gender and LDL-C levels were found between participants and non-participants, our sample could have been more motivated to change lifestyle behaviour, which might limit the generalisability of our findings .
While various unhealthy lifestyle factors are related to the atherosclerotic process, it is the long-term exposure that leads to the clinical manifestations of cardiovascular events . Vice versa, the effect of lifestyle improvements is likely to lead to CVD risk reduction only at the longer term. Inclusion of more long-term follow-up measurements in future RTCs on the efficacy of lifestyle interventions is to be recommended, since it would shed more light on possible effects on CVD risk and hard outcomes (e.g. CVD/death).
Altogether, it remains unclear how genetic and lifestyle factors interact in the FH population. FH is a monogenetic condition, though variations are found in mortality , suggesting that environmental factors play an important role as well. Whether the gene-environment interactions are synergistic or simply additive remains to be revealed. It would be informative to conduct a trial similar to the PRO-FIT project with the inclusion of a non-FH control group with elevated LDL-C levels. Despite the unknown interactions, the primary goal of treatment of people with FH should be considered as invariable: achieving optimal CVD risk reduction.
In conclusion, this project suggests that an individually tailored lifestyle intervention is not superior to usual care, regarding changes in LDL-C levels in people with FH. A small CVD risk reduction might result from the generally slight improvements of all the CVD risk indicators. However, in order to draw conclusions on impact of the cumulative effect of all these small improvements, and thus on the efficacy of lifestyle improvements in a FH population, more RCTs should be performed, including more long-term objective measurements (of e.g. carotid intima thickness and lipoprotein A) and long-term monitoring of CVD-related morbidity and mortality.
An individually tailored lifestyle intervention did not have an additional effect in reducing LDL-C levels among people with FH. The cumulative effect of many small improvements in all CVD risk factors on long term CVD risk remains to be assessed in future studies.
Kasper DL, Braunwald E, Fauci AS, Hauser SL, Longo DL, Jameson DL: Harrison’s principles of internal medicine. 2008, McGraw-Hill Medical Publishing Division, New York, 17
Goldstein J, Hobbs H, Brown M: Familial Hypercholesterolemia. The Metabolic and Molecular Bases of Inherited Disease. Edited by: Scriver C, Beaudet A, Sly WVD. 2001, McGraw-Hill, New York, 2863-2913.
Risk of fatal coronary heart disease in familial hypercholesterolaemia: Scientific steering committee on behalf of the simon broome register group. BMJ. 1991, 303: 893-896.
Treurniet HF, Hoeymans N, Gijsen R, Poos MJ, van Oers JA, Thien WM: Health status and the challenges for prevention in The Netherlands. Public Health. 2005, 119: 159-166. 10.1016/j.puhe.2004.05.018.
Yuan G, Wang J, Hegele RA: Heterozygous familial hypercholesterolemia: an underrecognized cause of early cardiovascular disease. CMAJ. 2006, 174: 1124-1129. 10.1503/cmaj.051313.
Baigent C, Keech A, Kearney PM, Blackwell L, Buck G, Pollicino C: Efficacy and safety of cholesterol-lowering treatment: prospective meta-analysis of data from 90,056 participants in 14 randomised trials of statins. Lancet. 2005, 366: 1267-1278.
Kearney PM, Blackwell L, Collins R, Keech A, Simes J, Peto R: Efficacy of cholesterol-lowering therapy in 18,686 people with diabetes in 14 randomised trials of statins: a meta-analysis. Lancet. 2008, 371: 117-125. 10.1016/S0140-6736(08)60104-X.
Versmissen J, Oosterveer DM, Yazdanpanah M, Defesche JC, Basart DC, Liem AH: Efficacy of statins in familial hypercholesterolaemia: a long term cohort study. BMJ. 2008, 337: a2423-10.1136/bmj.a2423.
Fruchart JC, Sacks F, Hermans MP, Assmann G, Brown WV, Ceska R: The Residual Risk Reduction Initiative: a call to action to reduce residual vascular risk in patients with dyslipidemia. Am J Cardiol. 2008, 102: 1K-34K. 10.1016/j.amjcard.2008.10.002.
Hegele RA: Environmental modulation of atherosclerosis end points in familial hypercholesterolemia. Atheroscler Suppl. 2002, 2: 5-7.
Austin MA, Hutter CM, Zimmern RL, Humphries SE: Familial hypercholesterolemia and coronary heart disease: a HuGE association review. Am J Epidemiol. 2004, 160: 421-429. 10.1093/aje/kwh237.
Kotseva K, Wood D, Backer GD, Bacquer DD, Py+Âr+ñl+ñ K, Keil U: EUROASPIRE III: a survey on the lifestyle, risk factors and use of cardioprotective drug therapies in coronary patients from 22 European countries. J Cardiovasc Risk. 2009, 16: 121-137.
Kromhout D, Menotti A, Kesteloot H, Sans S: Prevention of coronary heart disease by diet and lifestyle: evidence from prospective cross-cultural, cohort, and intervention studies. Circulation. 2002, 105: 893-898. 10.1161/hc0702.103728.
Blokstra A, van DI, Verschuren WM: Efficacy of multifactorial lifestyle interventions in patients with established cardiovascular diseases and high risk groups. Eur J Cardiovasc Nurs. 2010
Yusuf S, Hawken S, Ounpuu S, Dans T, Avezum A, Lanas F: Effect of potentially modifiable risk factors associated with myocardial infarction in 52 countries (the INTERHEART study): case–control study. Lancet. 2004, 364: 937-952. 10.1016/S0140-6736(04)17018-9.
Hopkins PN: Familial hypercholesterolemia–improving treatment and meeting guidelines. Int J Cardiol. 2003, 89: 13-23. 10.1016/S0167-5273(02)00420-5.
Civeira F: Guidelines for the diagnosis and management of heterozygous familial hypercholesterolemia. Atherosclerosis. 2004, 173: 55-68. 10.1016/j.atherosclerosis.2003.11.010.
Fouchier SW, Rodenburg J, Defesche JC, Kastelein JJ: Management of hereditary dyslipidaemia; the paradigm of autosomal dominant hypercholesterolaemia. Eur J Hum Genet. 2005, 13: 1247-1253. 10.1038/sj.ejhg.5201496.
Schulz KF, Altman DG, Moher D: CONSORT 2010 Statement: Updated guidelines for reporting parallel group randomised trials. J Clin Epidemiol. 2010, 63: 834-840. 10.1016/j.jclinepi.2010.02.005.
De VH, Mesters I, Riet JV, Willems K, Reubsaet A: Motives of Belgian adolescents for using sunscreen: the role of action plans. Cancer Epidemiol Biomarkers Prev. 2006, 15: 1360-1366. 10.1158/1055-9965.EPI-05-0877.
Broekhuizen K, van Poppel M, Koppes L, Kindt I, Brug J, van Mechelen W: Can multiple lifestyle behaviours be improved in people with Familial Hypercholesterolemia? Results of a randomised controlled trial. Int J Behav Nutr Phys Act. 2011
Rubak S, Sandbaek A, Lauritzen T, Christensen B: Motivational interviewing: a systematic review and meta-analysis. Br J Gen Pract. 2005, 55: 305-312.
Executive Summary of The Third Report of The National Cholesterol Education Program (NCEP) Expert Panel on Detection, Evaluation, And Treatment of High Blood Cholesterol In Adults (Adult Treatment Panel III). JAMA. 2001, 285: 2486-2497. 10.1001/jama.285.19.2486.
Jansen AC, van Aalst-Cohen ES, Tanck MW, Trip MD, Lansberg PJ, Liem AH: The contribution of classical risk factors to cardiovascular disease in familial hypercholesterolaemia: data in 2400 patients. J Intern Med. 2004, 256: 482-490. 10.1111/j.1365-2796.2004.01405.x.
Issa JS, Strunz C, Giannini SD, Forti N, Diament J: Precision and accuracy of blood lipid analyses by a portable device (Cholestech-LDX). Arq Bras Cardiol. 1996, 66: 339-342.
Panz VR, Raal FJ, Paiker J, Immelman R, Miles H: Performance of the CardioChek PA and Cholestech LDX point-of-care analysers compared to clinical diagnostic laboratory methods for the measurement of lipids. Cardiovasc J S Afr. 2005, 16: 112-117.
Carey M, Markham C, Gaffney P, Boran C, Maher V: Validation of a point of care lipid analyser using a hospital based reference laboratory. Ir J Med Sci. 2006, 175: 30-35. 10.1007/BF03167964.
Linnan L, Steckler A: Process Evaluation for Public Health Interventions and Research. Edited by: Linnan L, Steckler A. 2002, Jossey-Bass, San Francisco, 1-24.
Moyers TB, Martin T, Manual JK, Miller WR, Ernst D: Revised Global Scales: Motivational Interviewing Treatment Integrity 3.0 (MITI 3.0). 2007, Center on Alcoholism, Substance Abuse and Addictions (CASAA), University of New Mexico, Ref Type: Unpublished Work, 28
Halcomb EJ, Davidson PM: Is verbatim transcription of interview data always necessary?. Appl Nurs Res. 2006, 19: 38-42. 10.1016/j.apnr.2005.06.001.
Rubin DB: Multiple Imputation for Nonresponse in Surveys. 1987, J Wiley & Sons, New York
Walma E, Wiersma Tj: NHG-Standpunt Diagnostiek en behandeling van familiaire hypercholesterolemie. Huisarts Wet. 2006, 49: 202-204.
Huijgen R, Kindt I, Verhoeven SB, Sijbrands EJ, Vissers MN, Kastelein JJ: Two years after molecular diagnosis of familial hypercholesterolemia: majority on cholesterol-lowering treatment but a minority reaches treatment goal. PLoS One. 2010, 5: e9220-10.1371/journal.pone.0009220.
Viera AJ, Sheridan SL: Global risk of coronary heart disease: assessment and application. Am Fam Physician. 2010, 82: 265-274.
Kroeze W, Dagnelie PC, Heymans MW, Oenema A, Brug J: Biomarker evaluation does not confirm efficacy of computer-tailored nutrition education. J Nutr Educ Behav. 2011, 43: 323-330.
Groeneveld IF, Proper KI, van der Beek AJ, Hildebrandt VH, van MW: Short and long term effects of a lifestyle intervention for construction workers at risk for cardiovascular disease: a randomized controlled trial. BMC Publ Health. 2011, 11: 836-10.1186/1471-2458-11-836.
Shafiq N, Singh M, Kaur S, Khosla P, Malhotra S: Dietary treatment for familial hypercholesterolaemia. Cochrane Database Syst Rev. 2010, CD001918-
Kreman R, Yates BC, Agrawal S, Fiandt K, Briner W, Shurmur S: The effects of motivational interviewing on physiological outcomes. Appl Nurs Res. 2006, 19: 167-170. 10.1016/j.apnr.2005.10.004.
Carlson JA, Sallis JF, Ramirez ER, Patrick K, Norman GJ: Physical activity and dietary behavior change in Internet-based weight loss interventions: Comparing two multiple-behavior change indices. Prev Med. 2012, 54: 50-54. 10.1016/j.ypmed.2011.10.018.
Noar SM, Chabot M, Zimmerman RS: Applying health behavior theory to multiple behavior change: considerations and approaches. Prev Med. 2008, 46: 275-280. 10.1016/j.ypmed.2007.08.001.
Prochaska JJ, Spring B, Nigg CR: Multiple health behavior change research: an introduction and overview. Prev Med. 2008, 46: 181-188. 10.1016/j.ypmed.2008.02.001.
Britt E, Hudson SM, Blampied NM: Motivational interviewing in health settings: a review. Patient Educ Couns. 2004, 53: 147-155. 10.1016/S0738-3991(03)00141-1.
Levensky ER, Forcehimes A, O’Donohue WT, Beitz K: Motivational interviewing: an evidence-based approach to counseling helps patients follow treatment recommendations. Am J Nurs. 2007, 107: 50-58.
Dzewaltowski DA, Estabrooks PA, Klesges LM, Bull S, Glasgow RE: Behavior change intervention research in community settings: how generalizable are the results?. Health Promot Int. 2004, 19: 235-245. 10.1093/heapro/dah211.
Haskell WL: Cardiovascular disease prevention and lifestyle interventions: effectiveness and efficacy. J Cardiovasc Nurs. 2003, 18: 245-255.
Sijbrands EJ, Westendorp RG, Defesche JC, de Meier PH, Smelt AH, Kastelein JJ: Mortality over two centuries in large pedigree with familial hypercholesterolaemia: family tree mortality study. BMJ. 2001, 322: 1019-1023. 10.1136/bmj.322.7293.1019.
Acknowledgements and funding
We would like to acknowledge the patient organisation for people with (inherited) CVD (in Dutch: Hart &Vaatgroep/StichtingBloedlink) for initiating this project, and the Cascade screening programme of the Dutch Foundation for the Identification of Persons with Inherited Hypercholesterolemia (in Dutch: StOEH) for their support regarding the recruitment of participants. We are grateful to Dr. A. Oenema of the Erasmus University Medical Centre in Rotterdam, the Netherlands and prof. Dr. A. Dijkstra of the Rijksuniversiteit Groningen, the Netherlands, for sharing their computer-tailored advice modules. This work was supported by the Netherlands Organisation for Health, Research and Development (ZonMw) [50-50110-96-489].
The authors declare that they have no competing interests.
KB was responsible for data analysis, interpretation and reporting, while MvP, LK, IK, JB and WvM assisted in interpreting and reporting. All authors read, edited and approved the final version of the manuscript.
About this article
Cite this article
Broekhuizen, K., van Poppel, M.N., Koppes, L.L. et al. No significant improvement of cardiovascular disease risk indicators by a lifestyle intervention in people with Familial Hypercholesterolemia compared to usual care: results of a randomised controlled trial. BMC Res Notes 5, 181 (2012) doi:10.1186/1756-0500-5-181
- Waist Circumference
- High Density Lipoprotein Cholesterol
- Motivational Interview
- Familial Hypercholesterolemia
- Familial Hypercholesterolemia