Cardiovascular Risk Factor Analysis in Patients with a Recent Clinical Fracture at the Fracture Liaison Service

Patients with a low bone mineral density have an increased risk of cardiovascular diseases (CVD) and venous thromboembolic events (VTE). The aim of our retrospective chart review was to investigate the prevalence of CVD, VTE, hypertension (HT), and diabetes mellitus type 2 (DM2) in patients with a recent clinical fracture visiting the Fracture Liaison Service (FLS). Out of 3057 patients aged 50–90 years, 1359 consecutive patients, who agreed and were able to visit the FLS for fracture risk evaluation, were included (71.7% women; mean age 65.2 yrs). Based on medical history, 29.9% had a history of CVD (13.7%), VTE (1.7%), HT (14.9%), and DM2 (7.1%) or a combination. Their prevalence increased with age (21% in patients aged 50–59 years to 48% in patients aged >80 years) and was higher in men than in women (36% versus 27%), but independent of bone mineral density and fracture type. Careful evaluation of medical history with respect to these risk factors should be performed in patients with a recent clinical fracture before starting treatment with medications that increase the risk of VTE or cardiovascular events, such as raloxifene, strontium ranelate, or NSAIDs.


Introduction
Osteoporosis and cardiovascular diseases (CVD) are two health care problems with a major impact on mortality and morbidity. In addition, the prevalence of both conditions increases as the population ages, and it is expected that the number of patients suffering from these conditions will rise in the future due to the increased life expectancy. Patients with a recent clinical fracture are screened and treated for osteoporosis, if necessary, at the Fracture Liaison Service (FLS) according to guidelines on osteoporosis and fracture prevention [1][2][3][4][5][6].
The association between CVD and low BMD has clinical consequences for several therapies. Raloxifene is contraindicated in postmenopausal patients with a history of or an increased risk for venous thromboembolic events (VTE) [26,27]. Nonsteroidal anti-inflammatory drugs (NSAIDs), prescribed for pain management, are contraindicated in patients with CVD or at risk of CVD including hypertension (HT), heart failure, and diabetes mellitus type 2 (DM2) [27,28]. Strontium ranelate is contraindicated in patients with a history of cardiovascular diseases [29].
The aim of our retrospective chart review was therefore to investigate the prevalence of cardiovascular risk factors such as CVD, VTE, HT, and DM2 in medical history in patients at highest risk for a subsequent fracture, namely, those with a recent clinical fracture visiting the FLS.

Study Design and Population.
This study was designed as a retrospective chart review to examine the prevalence of cardiovascular risk factors in postmenopausal women and men aged between 50 and 90 years with a recent clinical vertebral or nonvertebral fracture who were evaluated at FLS of VieCuri Medical Centre Noord-Limburg located in Venlo (The Netherlands). Patients with metastatic cancer in bone, fracture due to high energy trauma, or failure of prosthesis were excluded.
After primary fracture care, a specialised nurse in osteoporosis invited all patients with a recent clinical fracture to the FLS for screening for osteoporosis according to the Dutch guidelines [1]. Patients who agreed to be evaluated at the FLS received a detailed questionnaire for evaluation of risk factors for fractures, falls, detailed medical history including previous fractures and medication use, and daily dietary calcium intake. During the visit at the FLS, a trained nurse measured height and weight and evaluated the questionnaire with special attention to medical history and daily dietary calcium intake. In addition a BMD measurement with dualenergy X-ray absorptiometry (DXA) of the lumbar spine, total hip, and femoral neck was performed and a blood sample was collected to detect contributors to secondary osteoporosis and metabolic bone disease [30]. Depending on the results of BMD measurement, calcium intake, and serum 25-hydroxyvitamin D [25(OH)D] levels, patients were treated with adequate calcium intake, vitamin D supplements, and antiosteoporosis medication according to the Dutch guidelines for treatment of osteoporosis [1].
Fractures were classified according to Center et al. into hip fractures, major fractures (vertebra, multiple rib, humerus, pelvis, distal femur, and proximal tibia), minor fractures (all remaining fractures except fingers and toes), and finger and toe fractures [31].

Bone
Densitometry. BMD in the hip and lumbar spine was measured using DXA with the Hologic QDR 4500 (Hologic, Bedford, MA, USA). Osteoporosis was diagnosed according to the WHO criteria for BMD [32]. Patients were classified according to the lowest value of T-score femoral neck, total hip, or lumbar spine. T-scores of ≤ −2.5 standard deviations (SD) below the reference mean were classified as osteoporosis; T-scores between −1.0 and −2.5 SD were classified as osteopenia; and T-scores ≥ −1.0 SD were classified as normal.

Cardiovascular Risk Factors.
Medical history of all patients was systematically screened and cardiovascular risk factors were classified into CVD, VTE, HT, and DM2. CVD comprised ischaemic heart disease, myocardial infarction, angina pectoris, percutaneous coronary intervention, coronary bypass, cerebrovascular accident, transient ischaemic attack, and peripheral artery disease. VTE comprised venous thromboembolism and pulmonary embolism. In addition, patients were classified as having at least one cardiovascular risk factor if CVD or VTE or HT was present in medical history.

Statistical Analysis.
Results are presented as means ± SD or percentages. Chi-square tests and Fisher's exact tests were used to test whether the variables are independent. Subgroup analyses were performed for gender, age per decade, BMD (normal versus osteopenia versus osteoporosis), and fracture type according to the center classification (finger and toe versus minor versus major versus hip). Logistic regression analyses were performed to adjust for age, sex, BMD (normal versus osteopenia versus osteoporosis), and fracture type according to the center classification (finger and toe versus minor versus major versus hip). All analyses were performed using SPSS for Mac (version 21.0, IBM SPSS Statistics, USA). A value ≤ 0.05 was considered as statistically significant.

Study Population.
From January 2009 until June 2011, 3131 patients aged between 50 and 90 years visited the emergency department with a recent clinical fracture. Seventyfour patients deceased before the invitation for fracture risk evaluation was sent, resulting in 3057 patients being invited. Of those, 1694 patients (55.4%) visited the FLS of whom 1359 (44.5%) had a fracture risk evaluation including BMD measurement. A total of 1359 patients (71.7% women and 28.3% men) with a mean age of 65.2 ± 9.5 years were evaluated at the FLS (Table 1). Osteoporosis was diagnosed in 29.6%, osteopenia was diagnosed in 47.7%, and 22.7% had a normal BMD. According to the center classification [31], 7.9% sustained a hip fracture, 28.7% a major fracture, 57.7% a minor fracture, and 5.7% a fracture of finger or toe. Based on medical history, 29.9% of the patients had a diagnosis of either CVD and/or VTE and/or hypertension and/or DM2. CVD was present in 13.7%, VTE in 1.7%, hypertension in 14.9%, and DM2 in 7.1% of patients visiting the FLS with a recent clinical fracture ( Table 2).

Cardiovascular Risk Factors and
Gender. The prevalence of CVD and/or VTE and/or hypertension and/or DM2 was significantly higher in men than in women (36.3% versus 27.3%; = 0.001) ( Table 2). CVD was more frequently diagnosed in men ( < 0.001), whereas the prevalence of VTE, HT, and DM2 was comparable for men and women. For the subcategories of CVD, myocardial infarction ( = 0.001), percutaneous coronary intervention ( < 0.001), and peripheral arterial disease ( = 0.001) were more frequently diagnosed in men. For other subcategories of CVD and for 13   subcategories of VTE, HT, and DM2, the prevalence of those diseases was comparable between men and women.

Cardiovascular Risk Factors and Bone Mineral Density.
There was no significant difference in the prevalence of CVD and/or VTE and/or HT and/or DM2 between patients with osteoporosis, osteopenia, and normal BMD (28.6%, 31.2%, and 29.1%, resp.; = NS). Further, there was no significant difference in the prevalence of CVD, VTE, HT, DM2, and the subcategories of CVD and VTE (data not shown).

Cardiovascular Risk Factors and Fracture
Type. As shown in Figure 1, in 34.4% of patients with a major fracture at least one cardiovascular risk factor or DM2 was present in medical history, as compared to 28.6% of patients with a minor fracture, 25.9% with a hip fracture, and 27.3% with a fracture of finger or toe ( = NS). In addition, there was no significant difference in the prevalence of CVD including its subcategories, VTE, HT, and DM2, if patients are classified according to fracture type. Only the prevalence of venous thromboembolism was significantly different (1.9% hip versus 0.5% major versus 2.3% minor versus 1.3% finger and toe; = 0.029) (data not shown). Table 3 and in Figure 2, it is shown that the prevalence of CVD and/or VTE and/or HT and/or DM2 in medical history increased significantly with age, rising from 20.8% in patients aged 50-59 years to 48.3% in patients aged 80-89 years ( < 0.001). From the subgroups, CVD, HT, and DM2 increased significantly with age; CVD was present in 7.6% of patients aged 50-59 years up to 25.8% in patients aged 80-89 years ( = 0.006); HT 11.0% up to 23.3% ( = 0.001); and DM2 3.6% up to 23.3% ( = 0.006). For all subcategories of CVD except percutaneous coronary intervention, the prevalence increased significantly with age (Table 3). For VTE, only a significant increase was found for the presence of pulmonary embolism in medical history ( = 0.009).    In Table 4, it is shown that, for each decade except for the decade 80-89 years, the prevalence of cardiovascular risk factors is significantly higher in men as compared to women. Only in women and men aged between 60 and 69 years, the prevalence of having at least one cardiovascular risk factor and the prevalence of having at least one cardiovascular risk factor or DM2 is comparable between women and men ( Table 4).

Cardiovascular Disease and Age. As presented in
In addition, at least one of these conditions was present in medical history in 25.6% of patients aged 50-69 years and in 39.3% patients aged 70 years and older ( < 0.001). CVD, VTE, HT, or DM2 increased with age and was more frequently present in men as compared to women: 23.1% of women aged 50-69 years versus 35.6% of women aged 70 years and older ( < 0.001 within women) as compared to 31.2% of men aged 50-69 years versus 50.5% men aged 70 years and older ( < 0.001 within men) (data not shown).
In adjusted analyses only age and sex were significant predictors for the presence of at least one cardiovascular risk factor (CVD, VTE, or HT), ( < 0.001 for age; < 0.001 for sex) and for the presence of at least one cardiovascular risk factor including DM2 ( < 0.001 for age; < 0.001 for sex).

Discussion
The aim of our retrospective review was to investigate the prevalence of cardiovascular risk factors including CVD, VTE, HT, and DM2 in medical history in patients with a recent clinical fracture visiting the FLS. Based on medical history, nearly one out of three patients had a medical history of CVD, VTE, HT, or DM2. CVD was more frequently present in men, whereas the prevalence of VTE, HT, and DM2 was similar in men and women. With increasing age, the prevalence of CVD, VTE, HT, and DM2 increased as well, up to half of men older than 70 years and of women older than 80 years.
There was no significant increase in the prevalence of these risk factors with decreasing BMD and increasing severity of fracture, except for BMD and HT and DM2. Adjusted analyses showed that age and sex remained significant predictors for the presence of CVD, VTE, HT, DM2, or at least one of these conditions, independent of BMD and fracture type according to the center classification and age and BMD for HT and DM2, independent of other risks.
The presence of cardiovascular risk factors in patients with a recent clinical fracture has important implications with regard to treatment and prevention of osteoporosis. Raloxifene is contraindicated in women with a history of VTE (including venous thromboembolism and pulmonary embolism) or women at risk of VTE [6,33,34], resulting in a contraindication in the prescription of raloxifene in 1.8% of women in our study. NSAIDs are contraindicated in patients with a history of CVD, heart failure, myocardial infarction, cerebrovascular accident, or transient ischaemic attack and in patients with an increased risk of ischaemic heart disease such as angina pectoris and percutaneous coronary disease and should be prescribed with caution in patients with HT and DM2 [28,35], resulting in a contraindication for prescription of NSAIDs in 29.9% of patients (27.3% women versus 36.3% men). Recently, the EMA has advised to restrict the prescription of strontium ranelate in patients with a   history of VTE, in patients at risk of VTE, and in patients with a CVD or HT in medical history [29], resulting in a contraindication for prescription of strontium ranelate in 26.5% of all patients (23.9% women versus 33.0% men).
Previous research has recommended that the treatment of cardiovascular disease should not only prevent new cardiovascular events, but also prevent fractures by evaluation and treatment of osteoporosis and vice versa [6].
This study has several limitations. First, the study is designed as a retrospective chart review. Therefore, we were not able to investigate the occurrence of new cardiovascular events after treatment with the antiosteoporosis medications was initiated. Second, only 55.4% of patients who visited the emergency department visited the FLS for fracture risk evaluation. Patients not visiting the FLS might be older, might have more severe fractures such as hip or humerus fractures for which surgical intervention was performed, might have postoperative complications, and might be living in a nursing home and are not able to visit the FLS. In combination with VTE often occurring after a major orthopaedic operation such as hip fracture surgery, the prevalence of cardiovascular risk factors might be underestimated.

Conclusions
In conclusion, CVD, VTE, HT, or DM2 was present in medical history of 29.9% of patients with a recent clinical fracture after age 50. The prevalence of these diseases increased with age and was higher in men than in women. These results emphasise that careful evaluation of medical history with respect to cardiovascular risk factors such as CVD, VTE, HT, and DM2 should be performed since medications such as raloxifene, strontium ranelate, and NSAIDs may increase cardiovascular risk or even may be contraindicated in a substantial number of patients with a recent clinical fracture.