- Open Access
Association of lung function with cardiovascular risk: a cohort study
Respiratory Research volume 19, Article number: 214 (2018)
The potential effects of pulmonary dysfunction on cardiovascular diseases (CVD) are receiving attention. We aimed to investigate and quantify the cross-sectional and longitudinal associations between lung function and overall cardiovascular risk among Chinese general population.
We studied 4019 participants from the Wuhan-Zhuhai cohort, with a follow-up of 3 years. A multivariable risk algorithm generated from the Framingham study was used to calculate individuals’ overall cardiovascular risk i.e. 10-Year CVD Risk, which was further classified into 2 categories: low (< 10%) and high (≥10%) CVD risk. General linear model and logistic regression model were separately used to assess the associations of lung function with continuous and dichotomous 10-Year CVD Risk.
Cross-sectionally, each 5% decrease in FEV1/FVC was associated with a 0.47% increase in 10-Year CVD Risk (P < 0.001). The adjusted odds ratio (OR) (95% confidence interval [CI]) for the prevalence of high CVD risk (10-Year CVD Risk≥10%) was 1.12 (1.07, 1.17) corresponding to each 5% decrease in FEV1/FVC. The OR (95% CI) for high CVD risk in the lowest group of FEV1/FVC (< 70% i.e. chronic obstructive pulmonary disease [COPD]) was 2.37 (1.43, 3.91) when compared with the highest group. Longitudinally, the adjusted risk ratio (RR) (95% CI) for the incidence of high CVD risk was 1.14 (1.03, 1.25) with each 5% decrease in baseline FEV1/FVC. Compared with the highest group of FEV1/FVC, the RR (95% CI) for high CVD risk in the lowest group (COPD) was 4.06 (1.46, 11.26). Analyses of 10-Year CVD Risk with FVC or FEV1 showed similar trends and significant associations (all P < 0.05).
Reduced lung function was cross-sectionally and longitudinally associated with increased cardiovascular risk in Chinese general population.
Cardiovascular diseases (CVD), including coronary disease, cerebrovascular disease, peripheral vascular disease and cardiac failure, are leading causes of morbidity and mortality in China and worldwide [1, 2]. To better prevent and control CVD, a global multivariable risk algorithm based on traditional CVD risk factors including sex, age, total and high density lipoprotein (HDL) cholesterol, systolic blood pressure and treatment for hypertension, smoking and diabetes status, was generated from the Framingham study . The model has been demonstrated to have good discrimination power and be able to estimate overall CVD risk in the next ten years (10-Year CVD Risk) for individuals without CVD . The 10-Year CVD Risk provides useful and elegant composite measures of the classical risk factors for CVD and reflects overall cardiovascular risk of individuals, thus it has been well recognized and widely used in fields of clinic and public health [3,4,5].
It is well known that cardiovascular and respiratory systems are closely linked with each other in physiology and pathophysiology. Cardiovascular dysfunction could affect lung function, in turn, pulmonary dysfunction may cause adverse cardiovascular outcomes [6, 7]. Pulmonary function, a noninvasive clinical diagnostic parameter, is often used to evaluate the conditions of the respiratory system and identify the severity of pulmonary impairments such as asthma and chronic obstructive pulmonary disease (COPD) . Accumulating evidence suggested that pulmonary dysfunction was positively and independently associated with CVD morbidity [9,10,11,12,13,14,15] and mortality [16,17,18,19,20]. A cross-sectional study conducted among 9688 Korean general population without obstructive lung disease found that forced vital capacity (FVC) was inversely related to 10-Year CVD Risk . However, it is still largely unknown whether the reduction of lung function parameters like forced expiratory volume in 1 s (FEV1) and the ratio of FEV1 to FVC (FEV1/FVC) are related to current and future CVD risk such as 10-Year CVD Risk. Further analysis on their associations in both cross-sectional and longitudinal ways will help better clarify and understand the potential effect of lung function decline on CVD.
Therefore, in present study, we investigated and quantified the cross-sectional and longitudinal associations between lung function (including parameters of FEV1, FVC and FEV1/FVC) and the 10-Year CVD Risk in a Chinese general population.
The study participants were from the Wuhan-Zhuhai cohort, a Chinese community-based prospective cohort, which has been described previously . Briefly, the cohort was established between 2011 and 2012, comprising 4812 participants aged 18 to 80 years who lived in Wuhan or Zhuhai city in China for more than 5 years. Standardized questionnaires and extensive physical examinations were carried out at baseline and 3 years later. For cross-sectional analysis, participants less than 30 years old (n = 260) or previously diagnosed with CVD (n = 317) were excluded, as 10-Year CVD Risk estimation was inapplicable for this population . We also excluded 216 subjects with missing data or outliers (>mean ± 3SD) on indexes of blood test, anthropometry, blood pressure or pulmonary function. Finally, a total of 4019 participants were included in our cross-sectional study. For longitudinal analysis, we further excluded 2196 individuals who did not attend physical examinations, or had missing data or outliers on indexes of blood test, anthropometry or blood pressure at 3-year follow-up. After further excluding 752 participants with 10-Year CVD Risk ≥10% at baseline, 1071 subjects were included in our longitudinal study. Individuals included and excluded in our study showed no differences with respect to basic demographic characteristics such as sex, body mass index, smoking status, drinking status, education levels, abdominal obesity, etc. (P > 0.05).
Lung function test
Lung function test was performed in accordance with the recommendation of American Thoracic Society . In brief, spirometry was conducted by specialists using digital spirometers (Chestgraph HI-101, CHEST Ltd., Tokyo, Japan), which were calibrated each day before testing, according to the manufacturer’s instruction. All individuals were suggested not to smoke for at least 1 h and not to have a big meal for 2 h before the test. Each participant was informed to keep a sitting position, wear a nose clip, and then breathe through the mouth-piece after at least 5 min of normal breathing during the testing procedure. Three acceptable volume-time curves of pulmonary function parameters were obtained after three satisfactory blows of each participant performed. Lung function parameters including FVC, FEV1 and FEV1/FVC were mainly used in our study. COPD was defined as FEV1/FVC < 70%, which was further classified into four stages according to Global Initiative for Chronic Obstructive Lung Disease (GOLD) : GOLD 1 (mild: FEV1/FVC < 70% and FEV1 ≥ 80% predicted), GOLD 2 (moderate: FEV1/FVC < 70% and 50% ≤ FEV1 < 80% predicted), GOLD 3 (severe: FEV1/FVC < 70% and 30% ≤ FEV1 < 50% predicted) and GOLD 4 (very severe: FEV1/FVC < 70% and FEV1 < 30% predicted).
Ten-year CVD risk calculation and classification
Sex-specific 10-Year CVD Risk was calculated by a multivariable risk factor algorithm that incorporated age, total cholesterol, HDL cholesterol, systolic blood pressure and treatment for hypertension, current smoking, and diabetes status, as described previously . According to the Framingham study  and Framingham database derived practice guideline , 10-Year CVD Risk was further classified into 2 categories: low (< 10%) and high (≥10%) CVD risk.
Ascertainment of covariates and CVD risk factors
Body mass index (BMI) was calculated by dividing weight (kg) by the squared value of height (m). Active physical activity was defined as regular exercise ≥2 times per week and each time ≥ 20 min within the last 6 months. Education degree was classified into 3 levels: middle school or below, high school, and university or above. Smokers comprised both current and former smokers, and smoking amount (pack-years) for each smoker was computed as packs of cigarettes per day multiplied by years of smoking. Participants were divided into drinkers (including current and former drinkers) and nondrinkers. Abdominal obesity was defined as waist circumference ≥ 90 cm for men or ≥ 80 cm for women. Blood lipids and fasting glucose levels were determined in the clinical laboratory of hospitals. Blood pressure was measured on the right arm of the seated participant with a validated automatic oscillometric device. Diabetes was defined as fasting plasma glucose ≥7.0 mmol/L, or taking oral hypoglycemic medication or insulin, or self-reported physician-diagnosed diabetes.
Subjects were divided into four groups based on quartiles (Q) of FVC or FEV1 or clinical thresholds of FEV1/FVC level (L1 < 70%; L2 70% ~ < 80%; L3 80% ~ < 90%; L4 ≥ 90%), for which 70% is a clinical threshold of COPD diagnosis and 80% is a critical value of normal lung function. Baseline characteristics across groups of FEV1/FVC were compared by variance analysis for continuous variables and Cochran-Armitage trend test for dichotomous variables. Analysis of covariance was used to compare 10-Year CVD Risk by groups of lung function parameters, with adjusting for gender, height, weight, abdominal obesity, smoking amount, drinking status, low density lipoprotein (LDL), physical activity, city and education levels. Age was not included in the statistic models for adjustment again, because as a dependent variable, 10-Year CVD Risk was estimated by a multivariable risk factor algorithm where age has been included, further adjustment for age in the statistic models again will lead to overcorrection and conservative association between lung function and CVD risk.
Association of lung function with continuous 10-Year CVD Risk was assessed using general linear model, with adjustment for potential confounders as mentioned above. The association was quantified by using estimated changes and 95% confidence intervals (CIs) of 10-Year CVD Risk with each 5% decrease of FEV1/FVC or each 50-mL decrease of FVC or FEV1 in continuous analyses. We also estimated changes (95% CI) of 10-Year CVD Risk across groups of lung function parameters in categorical analyses with the highest group (L4 or Q4) as the reference.
Logistic regression model was used to calculate the odds ratios (ORs), risk ratios (RRs) and 95% CI for dichotomous 10-Year CVD Risk (individuals with 10-Year CVD Risk ≥10% were regarded as cases) according to the decreasing of baseline lung function level, with adjusting for potential covariates as mentioned above. All statistical analyses were performed with SAS version 9.4 (SAS Institute, Cary, NC), and all p-values were two sided with a significant level at 0.05.
The baseline characteristics of the participants based on groups of FEV1/FVC are presented in Table 1. The mean age of 4019 participants (1304 men; 32.45%) was 53.98 years. Without adjustment for any confounder, the number of smokers, drinkers and participants with high 10-Year CVD Risk (≥10%), as well as age, smoking amount, low density lipoprotein and 10-Year CVD Risk significantly increased across decreasing FEV1/FVC groups (P < 0.001). In further analysis with COPD patients (group L1: FEV1/FVC < 70%), we found an upward trend of 10-Year CVD Risk as the progresses of COPD (from GOLD 1 to GOLD 4, P trend = 0.041) (Table S1). And COPD patients with older age, male sex, smoking or drinking habits achieved higher CVD risk (P < 0.05) (Additional file 1: Table S1).
Association of pulmonary function with 10-year CVD risk
With adjustment for potential covariates, leastsquares means of 10-Year CVD Risk by groups of lung function parameters at baseline are shown in Fig. 1. The highest 10-Year CVD Risk was observed in the lowest group of lung function parameters (L1 [COPD group] or Q1) when compared with those in other groups. Upward trend of 10-Year CVD Risk was significantly associated with decreased lung function groups.
Table 2 presents an inverse relationship between lung function and continuous 10-Year CVD Risk at baseline. After adjusting for potential confounders, each 5% decrease in FEV1/FVC was associated with a 0.47% increase in 10-Year CVD Risk (P < 0.001). Remarkably monotonic increase of 10-Year CVD Risk was shown when FEV1/FVC gradually decreased (P trend < 0.001). Similar trends and significant associations were also observed between FVC and FEV1 and 10-Year CVD Risk (Table 2).
Table 3 shows a negative association between lung function and dichotomous10-Year CVD Risk at baseline. After adjusting for potential confounders, the OR (95%CI) for the prevalence of high CVD risk (10-Year CVD Risk ≥10%) was 1.12 (1.07, 1.17) with each 5% decrease in FEV1/FVC. Compared with the highest FEV1/FVC group, multi-variate adjusted ORs (95%CI) gradually increased when lung function decreased. From the second highest to the lowest FEV1/FVC group (COPD), they were 1.11 (0.94, 1.31), 1.63 (1.31, 2.03), 2.37 (1.43, 3.91) for high CVD risk. Similar trends and significant relationships were also shown between FVC and FEV1 and 10-Year CVD Risk (Table 3).
After 3 years of follow-up, we recalculated the 10-Year CVD Risk for the 1071 participants included in our longitudinal study, and 214 incident cases of high CVD risk (10-Year CVD Risk ≥10%) were identified. RRs for the incidence of high CVD risk are shown in Table 4. A negative association between baseline lung function and incidence of high CVD risk was observed. The RR (95%CI) was 1.14 (1.03, 1.25) corresponding to each 5% decline in FEV1/FVC. The categorical analysis also showed a significant monotonic RR increase of high CVD risk as the decreasing of FEV1/FVC groups (P trend = 0.021). Compared with the highest FEV1/FVC group, the RRs (95%CI) for high CVD risk were 1.15 (0.80, 1.65), 1.41 (0.85, 2.34), 4.06 (1.46, 11.26) from the second highest to the lowest FEV1/FVC group (COPD). Similarly, significant negative associations of FVC and FEV1 with 10-Year CVD Risk were observed with all P and P trend < 0.001 (Table 4).
In the present study, negative cross-sectional and longitudinal associations were identified between lung function and 10-Year CVD Risk. After adjusting for potential confounders, increased prevalence and incidence of high CVD risk (10-Year CVD Risk ≥10%) were observed with the decline of lung function level. Additionally, when 10-Year CVD Risk was further classified into ≥6%/< 6% or > 20%/≤ 20% as also proposed by the Framingham study  and practice guideline derived from Framingham database , similar trends and significant associations with lung function were also found (data not shown). Our findings help to understand the correlation between lung function and current and future CVD risk. They also have significant implications for public health. Lung function test is a noninvasive clinical diagnostic method and is easy taken after routing training. The significant relationship between reduced lung function and increased CVD risk in ten years indicated that improving lung function or preventing lung function decline may help to prevent CVD.
Lung function has been linked to CVD risk in previous studies [21, 26, 27]. The 4th Korea National Health and Nutrition Examination Survey found that FVC decline was cross-sectionally associated with increased 10-Year CVD Risk . Similarly, a study by Arcari et al. on Italian general population showed that FVC or FEV1 reduction was cross-sectionally associated with elevated 10-Year CVD Risk . However, they did not find the association between FEV1/FVC, a mainly clinical diagnostic indicator for obstructive lung diseases such as COPD, and 10-Year CVD Risk, which is inconsistent with our findings. In our study, we found that not only FVC and FEV1 but also FEV1/FVC reduction was cross-sectionally and longitudinally associated with increased10-Year CVD Risk. Such discrepancy between our study and the published data may be partly due to the differences in race, genetics and lifestyles of the study population. For example, as a common risk factor for CVD, cigarette smoking rate was 22.05% in our study, lower than the mean smoking rate (28.10%) for adults in China . Physical activity rate, a protective factor of CVD, was 48.94% in our study, much higher than the average level (11.90%) of Chinese adults . These factors may lead to more obvious effect of lung function decline on CVD. Additionally, compared with the participants in our study (average BMI: 24.05 kg/m2), the subjects included in Arcari’s study had higher BMI with a mean value of 27.6 kg/m2, which was considered as overweight and on the brink of obesity . As risk factors for CVD [25, 31], overweight and obesity may partly conceal the effects of FEV1/FVC on the risk of CVD in Arcari’s study.
Furtherly, we noted that participants with COPD (FEV1/FVC < 70%) achieved the highest 10-Year CVD Risk in our present study. This result is consistent with those reported by Ford and colleagues. They found that aged adults with obstructive or restrictive impairment had an increased 10-Year CVD Risk compared with those with normal lung function . Besides, accumulating evidence suggested that COPD patients have an elevated risk of CVD and cardiovascular death, and nearly two fifths of COPD patients die of CVD [17, 18, 32].
The underlying mechanisms between pulmonary dysfunction and CVD remain incompletely understood. Generally, pulmonary and cardiovascular functions are closely related in both physiological and pathological conditions. At the circumstance of lung function decline, cardiac pumping function has to increase compensatorily to ensure the body’s oxygen need, which may result in cardiac and vascular overloads, and even cardiovascular injuries [33, 34]. If these situations were not improved timely, cardiovascular events might occur in the near future . Additionally, shared risk factors may partly explain the association between poor lung function and elevated CVD risk . It is well documented that several risk factors for lung function reduction, such as aging and smoking, are also well-established risk factors for CVD . And traditional cardiovascular risk factors such as hypertension, dyslipidemia and diabetes mellitus are common in subjects with lung function impairment including COPD . Air pollutants like particulate matters and polycyclic aromatic hydrocarbons are notable risk factors for both poor lung function and cardiovascular events [36,37,38]. However, the still observed association between lung function and CVD after adjusting for shared risk factors suggested the involvement of additional explanations .
Further explanations could be inflammation and oxidative stress, which were reported to have important contributions to both lung function decline and CVD risk increase . Evidence has shown that inflammation markers such as C-reactive protein, fibrinogen and inflammation-sensitive plasma proteins were involved in the inverse relationship between lung function and CVD risk [20, 21, 39]. As a major driving mechanism in the pathophysiology of lung function impairment, elevated oxidative stress in local pulmonary microenvironment may directly affect cardiovascular system . Previous studies suggested that oxidative stress may cause vascular dysfunction through inactivating the endothelial-derived nitric oxide by superoxide anion . Generation of reactive oxygen species (ROS) could promote inflammation in the vascular wall by inducing the production of pro-inflammatory genes and cytokines via the activation of NF-κB , whereas in turn, inflammatory cytokines (TNF-α, IL-6, etc.) could increase ROS production by NADPH oxidases [42, 43], causing a vicious circle that exacerbates vascular dysfunction . Moreover, oxidative stress and inflammation could also alter the vascular structure by promoting vascular remodeling, stiffness and atherosclerosis [44,45,46]. Therefore, the inflammation and increased oxidative stress in pulmonary dysfunction may independently increase CVD risk by altering vascular structure and promoting vascular dysfunction and insufficiency . Besides, evidence has shown that pulmonary dysfunction specific inflammation and oxidative stress may elevate cardiovascular risk also through increasing susceptibility to thrombotic or embolic events [47,48,49].
The strengths of our study include a relative large study population and a 3-year follow-up. Based on that, we could investigate the cross-sectional relationship between lung function and CVD risk and longitudinally evaluate the changes after 3 years. And to our knowledge, it is the first prospective study to investigate the relationship between lung function and 10-Year CVD Risk. However, there are still several limitations. First, rather than clinically diagnosed CVD, we evaluated the risk of CVD using a global multivariable risk algorithm, which was clinically used to estimate the 10-Year CVD Risk of individuals. Nevertheless, as an available endpoint, 10-Year CVD Risk do provide useful and elegant composite measures of the classical risk factors for CVD and represent individuals’ overall cardiovascular risk. Moreover, we are not unique in using 10-Year CVD Risk as a composite measure of CVD risk (endpoint), and a similar method was also taken by studies draw from Cardiovascular Risk Factor Multiple Evaluation in Latin America Study , Louisville Healthy Heart Study , Lifestyle Interventions and Independence for Elders Study , International Mobility in Aging Study , etc. Second, the CVD risk was merely estimated at baseline and at 3 years of follow-up, and the follow-up time may be relatively short. Further long-time longitudinal study may help to accurately evaluate such relationship.
Our study clearly demonstrated that reduced lung function was cross-sectionally and longitudinally associated with increased CVD risk in a general Chinese population. It suggests that improve lung function or prevent lung function decline may help to prevent CVD. Further studies with long-time follow-up are needed to validate our findings and illuminate the potential mechanisms.
body mass index
chronic obstructive pulmonary disease
- FEV1 :
forced expiratory volume in 1 s
- FEV1/ FVC:
the ratio of FEV1 to FVC
forced vital capacity
global initiative for chronic obstructive lung disease
high density lipoprotein
low density lipoprotein
Nicotinamide adenine dinucleotide phosphate
nuclear factor kappa B
reactive oxygen species
tumour necrosis factor alpha
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All volunteers who participated in this study and all members of the study team are greatly acknowledged.
This study was supported by National Key Research and Development Program (2016YFC1303903 and 2016YFC0901101); Key Program of the National Natural Science Foundation of China (91543207); Fundamental Research Funds for the Central Universities, HUST (2016YXZD044 and 2016JCTD116).
Availability of data and materials
The datasets used and/or analysed during the current study are available from the corresponding author on reasonable request.
Ethics approval and consent to participate
All participants enrolled provided written informed consent for participation. The study protocol was approved by the Ethics and Human Subject Committee of Tongji Medical College, Huazhong University of Science and Technology. The methods were carried out in accordance with the approved guidelines.
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Wang, B., Zhou, Y., Xiao, L. et al. Association of lung function with cardiovascular risk: a cohort study. Respir Res 19, 214 (2018) doi:10.1186/s12931-018-0920-y
- Lung function
- Chronic obstructive pulmonary disease
- Cardiovascular disease
- Cohort study