A systematic review of interventions aimed at improving the cardiovascular health of people diagnosed with personality disorders
People with personality disorders have significantly reduced life expectancy and increased rates of cardiovascular disease compared to members of the general population. Given that more people die annually of cardiovascular disease across the globe than from any other cause, it is important to identify the evidence for interventions aimed at improving cardiovascular health among people with personality disorders.
Systematic literature review. PsycINFO, MEDLINE and EMBASE were searched using NICE Healthcare Databases, as well as CENTRAL and trial registries. We sought to identify randomised controlled trials of interventions pertaining to adults with a primary diagnosis of personality disorder, where the primary outcome measure was cardiovascular health before and after the intervention.
A total of 1740 records were identified and screened by two independent reviewers. No papers meeting the inclusion criteria were identified.
This systematic review did not identify any randomised controlled trials testing interventions aimed at improving the cardiovascular health of people with personality disorders. Research in this area could have important public health implications, spanning the fields of psychiatry and general medicine.
KeywordsPersonality disorders Cardiovascular health Systematic review
Personality disorders (PDs) are complex mental health problems, with an overall estimated prevalence in western European countries of approximately 6% , affecting as many as 40% of those in contact with secondary mental health services . The Diagnostic and Statistical Manual of Mental Disorders (DSM) classification of personality disorders into three clusters is widely used; Cluster A includes the paranoid, schizoid and schizotypal categories, Cluster B includes the antisocial, borderline, histrionic and narcissistic categories, and Cluster C includes the avoidant, dependent and obsessive–compulsive categories . Although this review aims to include people with any type of personality disorder, much of the relevant epidemiological research has been conducted in people with Cluster B PDs, and specifically borderline personality disorder (BPD).
People with PD have a lower average life expectancy than the general population, with figures ranging from 18 years fewer in a London-based retrospective cohort study  to as many as 27.5 years for people with severe PD in a Scottish cohort . This loss of life years cannot simply be attributed to excess rates of suicide [6, 7]. A recent review of the literature relating to physical health problems experienced by people with PD has summarised associations with pain conditions, obesity and chronic illnesses including CVDs . The authors of this review found that, compared to controls, people diagnosed with Cluster B PDs were at increased risk of experiencing syncope, seizures and arthritis, as well as elevated levels of health concern in general . It was also noted that people with PD experience faster annual rates of health decline (by 50%) from adolescence to their mid-30 s compared to controls . These health problems are associated with increased health service utilisation compared to the general population [9, 10]. Other research has found differences in hospitalisation rates among people with borderline PD compared to controls which were especially apparent in relation to cardiac and gynaecological conditions .1
According to the World Health Organization (WHO), more people die annually from cardiovascular diseases (CVDs) across the globe than from any other cause. CVDs include coronary heart disease, cerebrovascular disease and peripheral arterial disease . In addition to the well-known occurrence of psychiatric co-morbidities in people with PD , the disproportionately high burden of physical health problems, such as CVDs, is becoming increasingly recognised as contributory to the stark reduction in life expectancy in this group [4, 14, 15, 16]. Moreover, the finding that physical illnesses predict death by suicide illustrates the critical interplay between poor physical health and suicide among people with PD [13, 17, 18]. Evidence for an association between PD and CVDs comes from various population-based epidemiological studies, which, for BPD, demonstrate adjusted odds ratios for CVD ranging from 1.47 to 7.2 [19, 20, 21]. In a UK household survey (n = 8580), Moran et al. found that people with a PD were almost twice as likely to report a history of stroke, and around 1.4 times as likely to report a history of ischaemic heart disease compared to the general population, after adjustment for age, sex, socioeconomic status, hypertension, diabetes, smoking and alcohol use . Similar figures come from the National Epidemiologic Survey on Alcohol and Related Conditions (NESARC) (n = 34,653), conducted in the United States, in which older adults with any PD were 1.26 times more likely to report a history of coronary heart disease than controls . The longitudinal Baltimore study, in which 244 people with PD were followed up over a 23-year period, found that Cluster B disorders were consistently associated with increased CVD incidence, and that their presence predicted CVD mortality . Furthermore, in a small sample of women with BPD (n = 47), common carotid artery ultrasound scanning demonstrated greater intima-media thickness (compared to healthy controls), an early marker for atherosclerosis and subsequent CVD risk .
When considering the psychopathology associated with PD, the susceptibility to certain cardiovascular risk factors is perhaps unsurprising. People with BPD, with its association with early life adversity and tendency towards impulsivity, have been found to have an increased risk of metabolic syndrome and dysregulated glucose and lipid metabolism , as well as higher rates of obesity [9, 25]. Interestingly and perhaps intuitively, rates of smoking, alcohol consumption and lack of regular exercise have been found to be higher in non-recovered patients with BPD compared to those who had recovered . An Australian cross-sectional study of young community-dwelling adults (n = 1520) also found strong independent associations between Cluster B PDs and smoking .
The WHO, like many national-level organisations, emphasises that most CVDs can be prevented by addressing behavioural risk factors such as tobacco smoking, poor diet, obesity and lack of exercise . These factors, as well as elevated blood glucose levels and hyperlipidaemia, are recognised as being causally linked to CVD . However, it cannot be assumed that the usual CVD risk reduction strategies are generalisable to people with PD; in this group, compared to the general population, important differences regarding patterns of healthcare utilisation , treatment adherence , and co-morbidities  must all be considered. We chose to carry out this systematic review as targeted interventions in this area are likely to provide an important avenue to narrow the health and life expectancy gap faced by people with PDs.
To assess whether any interventions designed to improve the cardiovascular health or cardiovascular risk factors in people diagnosed with PDs have been developed and evaluated using randomised controlled trials (RCTs).
To assess whether any such interventions are efficacious.
Search strategy and selection criteria
This systematic review was conducted in accordance with the Preferred Reporting Items for Systematic Reviews and Meta-Analyses (PRISMA) guidelines .
We searched for RCTs of interventions aimed at improving cardiovascular disease or improving cardiovascular risk factors in people with a primary diagnosis of PD.
Trials were eligible for inclusion if they met the following criteria:  used random allocation to assign participants to the intervention and control groups;  all participants were adults (aged 18–65 years) with a primary diagnosis of any type of PD, irrespective of the diagnostic criteria used.
We set out to include studies of any intervention aimed at improving cardiovascular disease or improving cardiovascular risk factors. This would include studies aimed at promoting smoking cessation, increasing levels of physical activity, reducing weight or body mass index (BMI), improving diet, improving blood pressure, blood glucose or blood lipid levels. Studies aimed at increasing physical health monitoring or access to physical healthcare which may improve cardiovascular health would also be included.
Cardiovascular health, measured by 10-year CVD risk, cardiovascular mortality, number of cardiovascular events such as myocardial infarction or stroke, or any relevant measure of cardiovascular health quoted by the study.
Measures of cardiovascular risk factors such as change in smoking status, change in levels of physical activity, change in weight or BMI, change in diet, blood pressure, blood glucose or blood lipid levels.
Leaving the study early for any reason including inefficacy of treatment, adverse events and death.
The following electronic databases were searched using NICE HDAS (Healthcare Databases Advanced Search): PsycINFO, MEDLINE and EMBASE. The search terms used for PsycINFO are provided in “Appendix”.2 To limit the results to RCTs, the Cochrane Highly Sensitive Search Strategies for identifying randomised trials were employed for each of PsycINFO, MEDLINE and EMBASE databases . No date, language, document type or publication status limitations were applied to the search.
In addition, the Cochrane Central Register of Controlled Trials (CENTRAL) was searched via the Cochrane Library. The following clinical trials registries were also searched to identify any unpublished or ongoing trials: World Health Organisation International Clinical Trials Registry Platform (ICTRP), ISRCTN Registry, EU Clinical Trials Register (EudraCT) and ClinicalTrials.gov. The reference lists of any included papers would also have been examined.
Data collection and analysis
Selection of studies
Covidence, a web-based software platform designed to streamline the production of systematic reviews, was used to facilitate the selection of studies . Electronic records identified from our search were imported to Covidence via Endnote X8 . Two review authors (KH and KB) independently screened all records identified from the search to identify potentially relevant papers for full-text review. Any disagreements were resolved by discussion among the two review authors; had this not been possible, it would have been further discussed with the senior author (PM).
Data extraction and management
In the event of relevant studies being identified, the two review authors planned to extract data from the included studies onto standardised forms.
Assessment of risk of bias in included studies
The two review authors planned to assess the risk of bias independently, using the Cochrane Risk of Bias tool . Risk of bias level and trial quality would then have been noted in a ‘Summary of findings’ table.
Description of studies
Results of database and trial registry searches
Three hundred and five duplicates were removed by Covidence, leaving 1740 records for screening. One paper was obtained for full-text screening but was excluded after discussion between the three authors (KH, KB and PM) as, although a proportion of the study population had a diagnosis of PD, results for this group were not differentiated from the included individuals with other diagnoses. This published RCT, conducted by Knapen et al., described how 199 patients (70 of whom had a diagnosis of PD) were randomly allocated to either a general programme of psychomotor therapy (control) or a personalised psychomotor fitness programme (intervention), each lasting for 16 weeks. The intervention group showed an increase in cardiorespiratory fitness, but no subgroup analysis for the patients with PD was reported, or made available on request from the authors .
We have argued that the modifiable risk factors associated with the development of CVD constitute an important target for narrowing the life expectancy gap between people with PD and the general population. The lack of identified trials in this area may partly be explained by the fact that the association between PD and CVD is less widely known compared to the association between CVD and other serious mental illnesses (SMI) .
In contrast to the paucity of trials in patients with PD, we have identified 10 systematic reviews investigating interventions to improve the cardiovascular health or cardiovascular risk profile of people with SMI [38, 39, 40, 41, 42, 43, 44, 45, 46, 47]. Moreover, most of these reviews did not include people with PD. We believe that excluding these people, who are at very high risk of CVD, is not only scientifically unsound but also represents a lost opportunity for developing an evidence base in a neglected field of health research.
Physical health appears to be under-assessed and under-treated in people with PD . Sanatinia et al. (2015) found that a lower proportion of those in a random sample of people with PDs had documented evidence of smoking status, blood glucose and blood lipid levels compared to people with schizophrenia. Moreover, people with PD were less likely to be offered smoking cessation advice than those with schizophrenia .
Research in people with SMI may offer guidance on future productive trials for people with PD. If we take smoking as an example, several trials (n = 26) relate to smoking cessation in people with SMI, as shown by the recent review by Peckham et al. . It is noteworthy that people with PD were excluded from this review. These trials often test relatively brief interventions, such as motivational interviewing. For example, Metse et al. conducted a cluster RCT of 754 adult psychiatric inpatients, 17.8% of whom had ‘personality and other disorders’ but with no further differentiation than this. They investigated the effect of a brief motivational interview and self-help material whilst in hospital, followed by a 4-month pharmacological and psychosocial intervention upon discharge. No significant effect was found on measures of prolonged abstinence at either 6 or 12 months, but intervention group participants were more likely than controls to have reduced cigarette consumption by 50% . This suggests that there could be grounds for testing the effectiveness of a brief motivational intervention for smoking cessation among people with PD specifically.
The mode of treatment delivery is also important to consider for people with PD, many of whom may lead turbulent and chaotic lives. It has already been established that the telephone is a feasible and acceptable mode of delivering interventions for people with PD, such as the use of telephone coaching in the context of dialectical behavioural therapy (DBT) . Telephone-delivered smoking cessation has been trialled in people with psychosis; for example, in a RCT involving 235 smokers with psychotic disorders, Baker et al. (2018) found that both an individual ‘healthy lifestyle intervention’ (consisting of motivational interviewing and cognitive behavioural therapy over 6 months) and telephone-delivered smoking cessation support achieved significant reductions in cardiovascular disease risk and smoking rates across a 36-month follow-up period . Such telephone-based interventions do not yet appear to have been trialled to improve cardiovascular risk factors in people with PD. However, the telephone could be a potentially promising delivery platform for a brief intervention designed to promote smoking cessation among people with PD. Ben-Porath (2004) hypothesises that telephone coaching in the context of DBT and self-harm provides a framework for encouraging patients to seek help in ‘more adaptive ways’ than their usual coping mechanisms ; this may well be applicable in the context of smoking in people with PD.
Smoking cessation is one example, but inspiration may be derived from a variety of approaches. Other trials in people with mental illness have aimed to reduce weight or waist circumference, for example by attempting to change the ‘obesogenic environment’ of inpatient facilities, with some positive results in the short term though not the longer term . Another example is the WebMOVE initiative in those with SMI, which consists of computerised weight-management with peer coaching, which contributed to a reduction in BMI in the intervention group . Further studies aimed to improve CVD risk more generally through lifestyle coaching [54, 55], or to improve access to physical healthcare via a peer health navigator scheme . These interventions may be of interest when planning future work in those with PD.
There is a conspicuous gap in the literature on interventions designed to improve the cardiovascular health of people with PD, despite the significantly increased prevalence of CVDs and mortality in this population. The lack of studies in this field is particularly accentuated when compared to the extent of recent and ongoing research into physical health interventions for people with other types of psychiatric disorders, such as psychotic or affective illnesses.
It is important to strive for parity of healthcare within psychiatric practice and this is particularly the case for people with PD, who are so often still excluded from mainstream healthcare. Our review shows that they are also excluded from trials evaluating the effectiveness of cardiovascular interventions. We believe that this is magnifying a serious public health problem, impacting both the quality of life of individuals with PDs and adversely affecting productivity in the context of wider health economics. We would argue that people with PD should be included in future trials of cardiovascular interventions. Such research could help to inform improvements in general health and mortality rates for people with this common and complex mental health disorder.
Thanks to Stephen Walker, Avon and Wiltshire Partnership Trust Librarian, and Sarah Herring, University of Bristol Medical Subject Librarian, for their help in developing the search strategies for this systematic review.
Compliance with ethical standards
This study was supported by the NIHR Biomedical Research Centre at University Hospitals Bristol NHS Foundation Trust and the University of Bristol. The views expressed in this publication are those of the author(s) and not necessarily those of the NHS, the National Institute for Health Research or the Department of Health and Social Care.
Conflict of interest
The authors declare that they have no conflict of interest.
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