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Normal and reference values for cardiovascular magnetic resonance-based pulse wave velocity in the middle-aged general population
Journal of Cardiovascular Magnetic Resonance volume 23, Article number: 46 (2021)
Aortic stiffness, assessed through pulse wave velocity (PWV), is an independent predictor for cardiovascular disease risk. However, the scarce availability of normal and reference values for cardiovascular magnetic resonance imaging (CMR) based PWV is limiting clinical implementation. The aim of this study was to determine normal and reference values for CMR assessed PWV in the general population.
From the 2,484 participants of the Netherlands Epidemiology of Obesity (NEO) study that have available CMR-PWV data, 1,394 participants free from cardiovasculard disease, smokers or treatment for diabetes, hypertension or dyslipidaemia were selected (45–65 years, 51% female). Participants were divided into sex, age and blood pressure (BP) subgroups. Normal values were specified for participants with a BP < 130/80 mmHg and reference values for elevated BP subgroups (≥ 130/80 and < 140/90 mmHg; and ≥ 140/90 mmHg). Differences between groups were tested with independent samples t-test or ANOVA. Due to an oversampling of obese individuals in this study, PWV values are based on a weighted analysis making them representative of the general population.
Normal mean PWV was 6.0 m/s [95% CI 5.8–6.1]. PWV increased with advancing age and BP categories (both p < 0.001). There was no difference between sex in normal PWV, however in the BP > 140/90 mmHg women had a higher PWV (p = 0.005). The interpercentile ranges were smaller for participants < 55 years old compared to participants ≥ 55 years, indicating an increasing variability of PWV with age. PWV upper limits were particularly elevated in participants ≥ 55 years old in the high blood pressure subgroups.
This study provides normal and reference values for CMR-assessed PWV per sex, age and blood pressure category in the general population.
Arterial stiffness is a marker of vascular disease and is becoming increasingly important in cardiovascular risk assessment [1, 2]. The pulse wave velocity (PWV) has arisen as the standard for the assessment of arterial stiffness. There are many technical variants of PWV assessment, where cardiovascular magnetic resonance (CMR) assessed PWV and applanation tonometry based carotid-femoral PWV (cf-PWV) are well-established techniques and independent predictors of cardiovascular disease (CVD) [1, 2]. These two techniques yield different PWV values, most likely due to the inability of cf-PWV to accurately assess aortic length  cf-PWV has some other important limitations as it can be difficult to obtain a signal in patients with obesity and local aortic PWV assessment is not possible . CMR-PWV is a promising technique for clinical use, however normal and reference values for CMR assessed PWV are scarce, currently limiting the clinical application [4,5,6,7,8].
In addition, age and sex specific normal and reference values for PWV are important for personalized CVD risk assessment, where over the last decades increasing evidence and awareness has emerged towards the difference in cardiovascular aging between men and women . Only a few, relatively small, studies have provided age and sex specific normal ranges for CMR-based PWV [4,5,6,7,8]. Although PWV may be a predictor of CVD on top of traditional risk factors as age and systolic blood pressure (BP), it is well known that PWV is also strongly dependent on age and BP [10, 11]. For this reason it is imperative to define normal PWV values for patients with normal BP and reference values for patients with elevated blood pressures in a population free of CVD, smokers or known hypertension, dyslipidaemia and diabetes, as has been done for cf-PWV .
The aim of this study was to define both normal values (normal BP) and reference values (high BP) stratified per sex and age category for CMR-based PWV in a population free of CVD.
Study population and study design NEO study
The present study is a cross-sectional analysis of the baseline measurements in the Netherlands Epidemiology of Obesity (NEO) study, a population-based, prospective cohort study in 6,671 men and women between 45 and 65 years . Men and women living in the greater area of Leiden (the Netherlands) were invited to participate in the study if they were aged between 45 and 65 years and had a self-reported body mass index (BMI) of ≥ 27 kg/m2. In addition, all inhabitants from one municipality (Leiderdorp) were invited to participate irrespective of their BMI, allowing for a reference distribution of BMI (n = 1,671). Participants completed a general questionnaire to report demographic, lifestyle and clinical information. At the baseline visit, all participants underwent an extensive physical examination including anthropometry and blood sampling. Participants with potential contraindications for CMR (i.e. metallic devices, claustrophobia, or a body circumference of 1.70 m) were excluded for additional imaging. Approximately 35% of the participants without potential CMR contraindications were randomly selected for abdominal MRI including PWV. For the present analysis, we included only data of individuals who underwent CMR PWV. Participants with overt CVD, smokers or participants who are treated for diabetes, hypertension or dyslipidaemia were excluded from the sample used, because these patients are known to have a significantly higher PWV . The Medical Ethical Committee of the Leiden University Medical Center (LUMC) approved the design of the study and all participants provided written informed consent.
Data collection NEO study
The participants were asked to bring all medication they were using to the study visit. Medication used in the month preceding the study visit was recorded. On the questionnaire, participants reported ethnicity by self-identification, tobacco smoking, highest level of education, and alcohol consumption using a food frequency questionnaire (in grams/day). Brachial BP was measured in a seated position on the right arm using a validated automatic oscillometric device (OMRON, Model M10-IT, Omron Health Care Inc, Kyoto, Japan). BP was measured three times with 5 min rest between consecutive measurements. The mean systolic and diastolic BP were calculated . Blood samples were drawn from the antecubital vein after 5 min rest of the participant during the baseline visit. Fasting plasma glucose and serum insulin concentrations, haemoglobin A1c (HbA1c), high sensitivity C-reactive protein (hsCRP), serum total cholesterol, low-density lipoprotein (LDL) and high-density lipoprotein (HDL) cholesterol were determined in the central clinical chemistry laboratory of the LUMC by using standard methods .
Cardiovascular magnetic resonance imaging
CMR was performed on a 1.5 T scanner (Philips Medical Systems, Best, the Netherlands) . Aortic PWV (expressed in meters per second) was imaged by using a previously described protocol, illustrated in Fig. 1 . In summary, a scout view of the entire aorta was obtained. A retrospectively electrocardiogram (ECG)-gated gradient-echo sequence with velocity encoding was performed during free breathing to assess flow using the following imaging parameters: field-of-view 300 mm, rectangular field-of-view percentage 90%, repetition time 4.8 ms, echo time 2.8 ms, flip angle 20°, acquired voxel size 2.34 × 2.34 × 8.00 mm, reconstructed voxel size 1.17 × 1.17 × 8.00 mm, temporal resolution 9.6 ms (defined by 2 times the repetition time) and on average 171 reconstructed phases. The velocity encoding was set to a maximum of 200 cm/sec. These through-plane flow measurements were performed at the level of the pulmonary trunk perpendicular to the ascending aorta, just below the diaphragm perpendicular to the descending aorta and just above the bifurcation of the abdominal aorta. To establish a high temporal resolution, a maximum number of phases was reconstructed. Maximum velocity–time curves from each sampling sited provided the arrival time of the systolic pressure wave. The foot of the systolic wave front was detected automatically using in-house developed software, by assessing the intersection point of the horizontal diastolic flow and the upslope of the systolic wave front, modelled by a linear regression along the upslope from the flow values between 20 and 80% of the range. The aortic path length between the measurement sites was measured using MASS software (Medis, Leiden, The Netherlands) The aortic path length was divided by the transit time between the arrival of the systolic wave front at these sites to calculate the PWV. Accurate assessment of PWV over shorter distances is more difficult due to the shorter transit time requiring a higher temporal resolution, therefore in this manuscript we focus on PWV of the entire aorta. PWV of the entire aorta was assessed as a weighted mean of the PWV sampled at these 4 measurement points, as adding sampling points along the aorta increases the accuracy of PWV measurement . The weighted mean was calculated by averaging the PWV of the 4 segments in proportion to their segment length.
In the NEO study individuals with a BMI of 27 kg/m2 or higher were oversampled. First, inhabitants of Leiden and its surrounding area between 45 and 65 years of age and with a self-reported BMI of 27 kg m-2 or higher were invited to participate in the NEO study. In addition, all inhabitants between 45 and 65 years living in one municipality, Leiderdorp, were asked to participate irrespective of their BMI. This resulted in an additional sample of 1671 participants with a BMI distribution that was similar to the BMI distribution of the general Dutch population . If inference is made on the general population, the overrepresentation of overweight and obese participants in the NEO study may introduce bias because of the skewed BMI distribution in the NEO population. Weighting towards the BMI distribution of the general population solves this problem . Using the reference BMI distribution of the Leiderdorp population, weight factors for the NEO population were calculated, resulting in a higher weight factor for participants with a lower BMI. Use of sampling weights yields results that apply to a population-based study without oversampling of individuals with a high BMI . Consequently, the results apply to a population-based study without oversampling of individuals with a BMI ≥ 27 kg/m2. Additional file 1: Figure S1 shows that the use of the weight factors results in a BMI distribution that is similar to that of the general population. This method has been used extensively in NEO study publications, among others to address oversampling in generating reference values .
We performed a complete case analysis. Normal values were presented as mean with 95% confidence interval (CI) and median with 10th, 25th, 75th and 90th percentiles in NEO participants stratified by sex (men/ women) and age (45.0 to 49.9, 50.0 to 54.9, 55.0 to 59.9, 60.0 to 64.9 years old) category. Furthermore, normal values were provided for the normal (< 130/80 mmHg) blood pressure subgroup, and reference values were provided for high BP subgroups (stage 1: ≥ 130/80 and < 140/90 mmHg; stage 2: ≥ 140/90 mmHg) according to the American College of Cardiology (ACC)/American Heart Association (AHA) guidelines. Differences between groups were tested with either a two-tailed independent samples t-test or ANOVA. Analyses were performed using STATA (Stata Corporation, College Station, Texas, USA) and results are presented according to the STROBE guidelines .
In total 6,671 individuals participated in the NEO study of whom a random subset of 2,484 participants without contraindications for CMR underwent CMR-PWV assessment. After exclusion of patients with cardiovascular disease (CVD), smokers and treatment for hypertension, diabetes or dyslipidaemia, the final study population consisted of 1,394 participants (flowchart is shown in Fig. 2), with a mean (SD) age of 55  years, of whom 51% is female. Physical and demographic parameters of the final study population stratified by sex are summarized in Table 1, characteristics of excluded participants are shown in Additional file 1: Table S1.
In this study population, in which participants treated for hypertension have been excluded, we provide normal values (n = 397) for the normal BP subgroup, and reference values for stage 1 (n = 474) and stage 2 hypertension (n = 523) BP subgroups.
Normal values for PWV
Normal values for PWV stratified by age are presented in Table 2 and normal values additionally stratified by sex are shown in Table 3. PWV increased with advancing age, where PWV increased on average 0.9 [0.7–1.0] m/s every 10 years (p < 0.001). The mean normal PWV for the age category 45 to 50 years old was 5.4 [95% CI: 5.3–5.6] m/s whereas it was 6.8 [95% CI: 6.5–7.0] m/s in the age category of 60 to 65 years (Table 2). There was no difference in PWV between men and women (overall mean of 6.0 [95% CI 5.8–6.3] m/s for men and 6.0 [95% CI 5.8–6.1] m/s for women, p = 0.57). Up to the age of 60 years, men had a slightly higher mean PWV than women, however in the age group of 60 to 65 years, women have a slightly higher PWV than men (Table 3). This rising trend in female PWV as compared to male PWV is also illustrated in Fig. 3, where the normal age and sex specific PWV values are shown (with 10th, 25th, median, 75th and 90th percentile lines). For comparison, an overview of previously published studies defining CMR-based PWV values in the age range 45–65 years is provided in Table 4.
Reference values for PWV
Reference values stratified by age and sex are presented in Table 3. In the high BP (stage 1 and 2) reference populations, PWV increased slightly faster with advancing age than the normal values did; where PWV increased on average 1.0 [0.8–1.3] m/s every 10 years for stage 1 (p < 0.001) and 1.3 [0.9–1.7] m/s every 10 years in stage 2 hypertension subgroups (p < 0.001). Mean PWV was higher in participants with a high BP (6.8 [95% CI 6.6–6.9] m/s) as compared to normal BP (6.0 [95% CI 5.8–6.1] m/s, p < 0.001). Mean and median PWV values were sequentially higher in increasing BP subgroups in both men and women (Table 3 and Fig. 4).
In contrast to the normal population, in the reference populations women consistently had a slightly higher PWV than men (Table 3). Similar to the normal population there was no overall difference in PWV between sexes for stage 1 hypertension (mean of 6.3 [95% CI 6.1–6.6] m/s for men and 6.5 [95% CI 6.3–6.8] m/s for women, p = 0.24). However, in the stage 2 hypertension subgroup women had a higher PWV than men (mean of 6.8 [95% CI 6.6–7.0] m/s for men and 7.4 [95% CI 7.1–7.8] m/s for women, p = 0.005). Women showed an increasingly rising trend for PWV values with age, particularly in the 90th percentile lines, as was also observed in the normal values for women. The difference between men and women is consequently only observed in the age subgroup of 60 to 65 years old (PWV for men 7.5 [95% CI 7.1–7.9] m/s and for women 8.5 [95% CI 7.8–9.3] m/s, p = 0.02). These results are illustrated in Fig. 4, where the age and sex specific reference PWV values are shown (with 10th, 25th, median, 75th and 90th percentile lines).
Normal and reference values per aortic segment can be found in the supplemental tables (Additional file 1: Tables S2-S7). Normal PWV values per aortic segment in the weighted analysis versus the reference (Leiderdorp) population (general population not selected based on BMI of ≥ 27 kg/m2) are shown in Additional file 1: Table S8.
In this population-based study of 1,394 participants, normal and reference ranges for CMR-based PWV were established in the general population free of CVD and treatment for hypertension, diabetes or hypercholesterolemia. This is the largest study to date to provide age and sex specific normal values (for normal BP < 130/80 mmHg) and reference values (for stage 1 (≥ 130/80; < 140/90 mmHg) and stage 2 hypertension (≥ 140/90 mmHg)) for CMR-PWV. Defining normal values and reference values is essential for the implementation of CMR-PWV in clinical care.
Normal and reference values for PWV
CMR assessment of aortic pathology is gaining clinical relevance, since it provides the opportunity for simultaneous assessment of aortic dimensions together with aortic stiffness, distensibility, blood flow and wall shear stress. Normal and reference values for cf-PWV based on applanation tonometry have previously been established by the Reference Values for Arterial Stiffness Collaboration Group, who determined age, sex and BP specific normal and reference values in a pooled study population consisting of 11,092 participants . This group reported higher normal PWV values than we did, for example, mean and median PWV was more than 2 m/s higher in the 50 to 60 years old age group. Given the low risk profile of both populations, the difference in normal PWV values is most likely explained by the use of different PWV techniques (applanation tonometry versus CMR), illustrating the need for CMR-PWV specific normal and reference values. The ability to accurately assess aortic length is crucial for accurate PWV assessment, whereas cf-PWV requires the use of a correction factor of 0.8 to adjust for the overestimation of aortic length [22, 23]. Since aortic length is known to increase with age, this correction factor is known to perform worse with aging which is an important limitation of cf-PWV that does not apply to CMR-PWV .
Beside different PWV techniques such as cf-PWV, there are also differences in CMR-PWV scanning techniques, for example, techniques based on 2D through-plane or in-plane phase-contrast or 4D flow, in which 4D flow has the advantage of providing local PWV and additional parameters as wall shear stress at the cost of a higher temporal resolution [25, 26]. Most of these techniques are in good agreement with invasive intra-aortic pressure measurements . This is also the case for the multi-slice through-plane phase-contrast PWV used in the current study, which is the most widely available and most user friendly technique [14, 25].
Previous studies that determined normal and reference values for CMR-PWV were limited by their sample size and/or defined in a specific age range (e.g. children and adolescents) . We observed similar normal PWV values as compared to a small study performed in an Asian population (n = 124), which had a similar CVD risk profile and used the same CMR-PWV technique . A small investigation with 25 healthy subjects using a similar CMR-PWV technique showed comparable normal PWV values as compared to our results . One of the larger previous investigations (n = 777), also using gradient-echo multi-slice through-plane PWV, found higher PWV reference values as compared to our study, which can be explained by the fact that they included patients treated for diabetes, hypercholesterolemia and hypertension, subgroups known to have increased PWV values . A recent study provided reference values for 4D-flow CMR-PWV (n = 126), which found consistently higher PWV values for men . Also they found slightly higher PWV values as compared to our population, particularly for men, which may also be attributed to the inclusion of participants with diabetes, hypertension and hypercholesterolemia. An overview of these studies can be found in Table 4.
In our population there were no differences between men and women in CMR-PWV values, except in the highest age and BP subgroup. Sex differences in PWV normal and reference values remain a topic of debate as previous studies found conflicting results regarding sex differences [4,5,6, 8, 12]. These varying results can partially be explained by the used sample sizes in combination with the included age distribution, where cardiovascular sex differences are likely to become more pronounced after menopause . The median and 90th percentile PWV for men and women showed a diverging trend with advancing age, with a stronger increase in women (Fig. 3). Women are known to have a lower CVD risk before menopause but this risk increases after menopause around the age of 55 as is also observed in our CMR-PWV normal and reference values . The hormonal changes during menopause can lead to changes in body fat composition, cholesterol metabolism, impaired endothelial function and inflammatory processes which effect vascular structure and accelerates vascular dysfunction leading to increased CVD risk .
Consistent with our current knowledge of vascular stiffness etiology, normal CMR-PWV values increased with age, with an average increase of 0.9 m/s every 10 years between the age of 45 to 65. Age affects aortic stiffness through complex inflammatory and oxidative stress pathways disrupting endothelial and smooth muscle cell function and extracellular matrix composition . The variability of PWV also increased with age, as the 90th percentile showed a stronger increase compared to the 10th percentile, demonstrating the variability of vascular aging in the general population.
The close relation between PWV and BP has been previously captured in mathematical functions, as PWV is known to increase with BP . Even though participants with treatment for hypertension were excluded, there was still a large variation in PWV values between normal and high BP subgroups. The variability of PWV values was relatively small in the normal BP population, however this increased substantially in the high BP groups. The ACC/AHA BP guideline used in this study is stricter than the European Society of Cardiology (ESC) guideline, which defines hypertension as a BP above 140/90 mmHg [20, 30]. Therefore, depending on which definition is used, the BP category ≥ 130/80 and < 140/90 mmHg can also be regarded as (high) normal. The ESC guideline currently uses a cut-off for cf-PWV of 10 m/s as abnormal, however a single cut-off for PWV does not capture the variability in CVD risk between different age groups and BP ranges . Given how important age, sex and BP related changes are in affecting aortic stiffness, specific reference values are imperative for identification of high risk patients using CMR-PWV.
Although this large population study provides necessary CMR-PWV normal and reference values, there are also some limitations to consider. Because there was a oversampling of obese participants in the NEO study, adjustments were performed by weighting individuals towards the BMI distribution of participants in the Leiderdorp subpopulation . As a result, the normal and reference values do apply to the general population between 45 and 65 years. This study provides normal and reference values for the age range 45 to 65 years, an important age group for CVD risk stratification, however there is no information available for other age groups outside these ranges in this study. Although we used the weighting factor to achieve a population that is representative of the general population and have excluded participants with known CVD, smokers and participants who were being treated for diabetes, hypertension or dyslipidemia, this is a population study. Therefore, PWV can variate more as compared to a selected healthy population due to variations in among others body height, weight, other medication use, chronic infections, exercise and dietary habits. The normal values in this study apply to the average population with a normal BP without overt CVD. The NEO population exists for 95% of Caucasian participants, so the use of these normal and reference values in areas with different ethnic compositions should be done with caution, as arterial stiffness assessed with PWV has shown to differ between ethnic groups. Furthermore, it should be recognized that BP was assessed at the initial visit (3 consecutive measurement with 5 min rest in between), where measurement over multiple visits or assessment of 24-h ambulatory BP would have been preferable.
This study provides normal and reference values for CMR-assessed PWV per sex, age and BP category in the middle-aged general population free of CVD. These values provide incremental information in CVD risk assessment on top of traditional risk factors, such as age and BP, making them essential for the clinical application of CMR in the assessment of cardiovascular pathology.
Availability of data and materials
The datasets generated and/or analysed during the current study are not publicly available due to the privacy of the participants of the NEO study and legal reasons, but will be made available to qualified researchers by the NEO Executive Board upon reasonable request, which can be contacted via https://www.lumc.nl/org/neostudie/contact/.
American College of Cardiology/American Heart Association
Body mass index
Carotid-femoral pulse wave velocity
Cardiovascular magnetic resonance
European Society of Cardiology
High density lipoprotein
High sensitivity C-reactive protein
Low density lipoprotein
Netherlands Epidemiology of Obesity
Pulse wave velocity
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We express our gratitude to all participants of the Netherlands Epidemiology in Obesity study, in addition to all participating general practitioners. We furthermore thank P.R. van Beelen and all research nurses for collecting the data and P.J. Noordijk and her team for sample handling and storage and I. de Jonge for data management.
The NEO study is supported by the participating departments, the Division and the Board of Directors of the Leiden University Medical Centre, and by the Leiden University, Research Profile Area ‘Vascular and Regenerative Medicine’.
Ethics approval and consent to participate
The Medical Ethical Committee of the Leiden University Medical Center (LUMC) approved the design of the study.
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All participants gave their written informed consent.
The authors declare that they have no competing interests.
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van Hout, M.J., Dekkers, I.A., Westenberg, J.J. et al. Normal and reference values for cardiovascular magnetic resonance-based pulse wave velocity in the middle-aged general population. J Cardiovasc Magn Reson 23, 46 (2021). https://doi.org/10.1186/s12968-021-00739-y
- Pulse Wave Velocity
- Magnetic Resonance Imaging
- Arterial stiffness
- Cardiovascular disease