Predictive value of noninvasive peripheral atherosclerosis measurement for coronary artery disease in patients with long T2DM duration

doi:10.21203/rs.3.rs-2100522/v1

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Predictive value of noninvasive peripheral atherosclerosis measurement for coronary artery disease in patients with long T2DM duration

https://doi.org/10.21203/rs.3.rs-2100522/v1

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Background

Vascular ultrasound is a commonly used tool to predict the existence and severity of coronary artery disease (CAD) by detecting the atherosclerosis of peripheral arteries. However, most studies on atherosclerosis are based on the general population, and the predictive efficacy of carotid or femoral ultrasound in type 2 Diabetes mellitus (T2DM) and its correlation with CAD severity are less elucidated. This study aimed to compare the predictive value of carotid or femoral artery ultrasound for CAD in T2DM patients free from known CAD, and to assess the relationship with the severity of coronary artery stenosis.

Methods

Cross-sectional study in adults with a T2DM duration of at least 5 years and without established CAD. All participants underwent carotid and femoral ultrasound and underwent coronary angiography for the first time. The carotid plaque score (CPS) was calculated by the sum of the maximum thickness of plaques on three segments of the carotid arteries on both sides. The Gensini score was used to assess the severity of coronary stenosis, and patients were divided into no or mild group, moderate group and severe group according to the tertile of the score.

Results

Multiple regression analysis showed that carotid plaque score, femoral plaque and smoking were independently and positively correlated with CAD. Carotid plaque score yielded the highest area under the curve for detecting significant coronary disease (AUC = 0.7323). In contrast, the area under the curve of femoral artery plaque and carotid intima-media thickness was lower than 0.7, which was at a lower prediction level. In the no or mild, moderate and severe groups, the CPS value gradually increased, and the difference between the groups was statistically significant (p < 0.05). The positive rate of femoral artery plaque in patients with moderate and severe CAD was significantly higher than that in the no or mild group (p < 0.0001).

Conclusion

In patients with long T2DM duration, carotid plaque score has a higher ability to predict the occurrence and severity of CAD. However, femoral artery plaque has special value in predicting moderate to severe coronary artery disease in patients with long-term T2DM.

Peripheral atherosclerosis

Coronary artery disease

Type 2 diabetes mellitus

Gensini score

Carotid plaque score

Femoral artery plaque

The prevalence of diabetes mellitus in the world continues to rise, and in countries such as China, the proportion has risen to 10% of the population [1]. By 2045, there will be more than 600 million people suffering from type 2 diabetes mellitus (T2DM) in the world. A meta-analysis of 102 prospective studies showed that diabetes increased the risk of multiple vascular diseases by about two times, independent of other conventional risk factors [2]. Atherosclerotic cardiovascular disease (ASCVD) refers to a disease involving the accumulation of cholesterol in the arteries, usually manifested as coronary heart disease, cerebrovascular disease and peripheral artery disease of atherosclerotic origin [3].T2DM is not only associated with the early onset of ASCVD [4, 5], but also with the severity [6] and poor prognosis of ASCVD [7].

Various non-invasive methods, which can be used to detect the presence and severity of extracoronary atherosclerotic disease, have been proved to be good predictors of coronary artery disease (CAD) and may guide treatment [6, 8, 9]. Currently, atherosclerosis screening for asymptomatic patients is still not recommended, and the final balance of benefits, costs and risks is still controversial [10]. This study population with long T2DM duration but still free from significant CAD can be regarded as a high-risk target population for CAD. In this specific population, the use of carotid / femoral ultrasound for noninvasive imaging can better improve the risk assessment with more benefits [11]. To the best of our knowledge, there have been no studies on the predictive value of various noninvasive peripheral atherosclerosis measures for coronary atherosclerosis in this specific population, with long-term T2DM. Therefore, we investigated several noninvasive measures of peripheral atherosclerosis and their predictive value in the presence and severity of coronary artery disease in long-term T2DM patients.

Study population

Patients with T2DM who underwent first coronary angiography and carotid ultrasound and lower extremity vascular ultrasound in the Affiliated Hospital of Medical School, Ningbo University from January 2020 to June 2022 were retrospectively enrolled in this study. T2DM was defined according to the current American Diabetes Association guidelines [12]. Inclusion criteria were: age ≥ 18 years, T2DM duration ≥ 5 years and absence of known CAD (i.e., no history of angina pectoris, acute coronary syndrome). The studies involving human participants were reviewed and approved by medical ethics committee of Affiliated Hospital of Medical College of Ningbo University. Written informed consent for participation was waived for this study by medical ethics committee of Affiliated Hospital of Medical College of Ningbo University due to the retrospective nature of the study. The formulation of this study scheme was in accordance with the requirements of the Declaration of Helsinki of the World Medical Association.

Measurements

Clinical characteristics and laboratory data

Clinical data were obtained from the electronic medical record system during the hospital stay in which coronary angiography was performed. Weight and height were measured using a standardized approach, followed by the calculation of body mass index (BMI) in kg/m2. Blood pressure was obtained as the mean of 3 consecutive measurements with an OMRON M10-IT automatic oscillometric sphygmomanometer (OMRON Healthcare Co. Ltd., Kyoto, Japan), with the individuals resting in a seated position for 5 min between readings. Use of antihypertensive medication or average blood pressure levels greater or equal to 140/90 mmHg defined the presence of arterial hypertension according to the latest ESH/ESC guidelines [13]. Blood samples were collected between 8.00 and 10.00 a.m. after an overnight (> 8 h) fast were processed for laboratory analyses the same day. Fasting serum glucose, triglycerides (TG), total cholesterol (TC), and high-density lipoprotein cholesterol (HDL-C) were measured by spectrophotometry. Low-density lipoprotein cholesterol (LDL-C) was calculated. Current smoking was defined as smoking in the present or having smoked in the last year. Being a former smoker was defined as a subject having smoked at least 50 cigarettes in his lifetime, but not having smoked in the last year.

Femoral And Carotid Atherosclerosis Assessment By Ultrasound And Carotid Plaque Score

Femoral and carotid ultrasound was conducted by an experienced imaging technician within 7days of coronary angiography. The sonographer and the interpreting cardiologist were blinded to the angiographic findings. The maximum distal common carotid intima-media thickness (C-IMT) was determined and the average of left and right maximum common C-IMT was computed. Plaque was defined using the Mannheim criteria as a focal structure that protruded into the arterial lumen by 50% of the surrounding intima-media thickness or that was ≥ 1.5 mm in thickness from the media-adventitia border to the intima-lumen border [14].In all cases, plaques were recorded in both longitudinal and transverse planes to account for circumferential asymmetry.

We also measured the carotid plaque score (CPS) for the common and internal carotid arteries [6]. The CPS was computed by adding the maximal thickness in millimeters of plaques in each segment on both sides (A + B + C + thickness of the contralateral carotid artery plaques) (Fig. 1). Segment 1 (S1) was the region of the internal carotid arteries (ICA) that was < 15 mm distal to its bifurcation from common carotid artery (CCA). Segment 2 (S2) was the region of the ICA and the CCA that was < 15 mm proximal to the bifurcation. Segment 3 (S3) was the region of the CCA that was > 15 mm and < 30 mm proximal to the bifurcation. The length of individual plaques was not considered in determining the CPS (Fig. 1).

The Gensini Score And Angiographic Analysis:

Two of the five experienced physicians evaluated the patient's coronary condition according to the guidelines for coronary angiography of the American College of Cardiology and the American Heart Association [15, 16]. Due to the inability to accurately obtain collateral adjustment factors from the available data, the modified Gensini score (GS) system was used to measure CAD severity [17]. These scores were expressed as the sum of the positional score of each lesion multiplied by the obstruction severity score, which emphasizes the severity of the disease. The calculation of the modified Gensini score system is shown in Table 1. The lesion score of each segment was calculated as stenosis score × weight coefficient. The cumulative score of each segment lesion was the total score of the degree of coronary artery lesion of the patient.

Table 1

modified Gensini score system
The degree of stenosis (%)	Score	Lesion location	Weight coefficient
1–25	1	The second diagonal and other segments	0.5
26–50	2	Right coronary artery	1.0
51–75	4	The mid-distal region of the left circumflex artery	1.0
76–90	8	The distal left anterior descending artery, first diagonal branch	1.0
91–99	16	The mid-region of the left anterior descending artery	1.5
100	32	The proximal left anterior descending artery or proximal left circumflex artery	2.5
		The left main coronary artery	5

Statistical analysis

All statistical analyses were performed using SPSS 26.0 for Mac (IBM Corp., Armonk, New York, USA) and GraphPad Prism version 9.0 for Mac (GraphPad Software, San Diego, California, USA). Data were checked for normality with the Kolmogorov–Smirnov test as well as visually by Q–Q plots and shown as mean ± SD or median [P25-P75] depending on the distribution. Categorical variables are displayed as percentages and absolute numbers. Independent samples t-test and one-way ANOVA were used to compare normally distributed continuous variables between two or more independent groups, respectively. Homogeneity of variance was evaluated by Levene’s test. For comparisons of non-normally distributed variables between two or more groups, the non-parametric Mann–Whitney U test and Kruskal–Wallis test were used, respectively. Post-hoc testing with Bonferroni correction (parametric) or the Dunn’s test (non-parametric) was used for multiple comparisons. Categorical variables were compared using the chi- squared. Univariate and multivariate logistic regression analysis was used to explore the possible risk factors for CAD. Receiver operating characteristic (ROC) curves were created to determine the most accurate assessment for detecting significant CAD (≥ 50% stenosis). Weighted Youden indices were used to determine optimal threshold values for identifying significant CAD. Level of significance was set at p < 0.05.

Study population characteristics

The present analysis included 245 subjects. Characteristics of the examined population are displayed in Table 2. 245 patients (137 male) aged 68.21 ± 9.5 years (range: 36–95 years), with T2DM duration 12.04 ± 6.17 years (range: 5–34 years), and without CVD were included. CAD was diagnosed in 165 patients (67.3%).Those with CAD were more often smoking, had femoral artery plaque, and had higher CPS and Gensini score, compared to those without CAD (p < 0.05). In addition, compared with non-CAD patients, CAD patients tended to be older, have a longer duration of T2DM, higher total cholesterol, lower HDL-C and higher C-IMT values, but the differences were not statistically significant (p > 0.05). However, there were no differences in gender, BMI, hypertension, fasting blood glucose, triglyceride or LDL-C between participants with or without CAD (p > 0.05).

Table 2

Patient characteristics
Variable	All (n = 245)	without CAD (n = 80)	With CAD (n = 165)	p value
traditional risk factors
Males, N (%)	137 (55.9%)	42 (52.5%)	95 (57.6%)	0.455
Age (years), mean ± SD	68.21 ± 9.50	66.92 ± 9.38	68.84 ± 9.53	0.137
BMI (kg/m2), mean ± SD	24.98 ± 3.38	24.87 ± 3.46	25.03 ± 3.35	0.723
T2DM duration (years), mean ± SD	12.04 ± 6.17	11.24 ± 6.26	12.42 ± 6.12	0.16
Alcohol consumption history, N (%)	60 (24.5%)	21 (26.3%)	39 (23.6%)	0.656
Mean SBP (mmHg), mean ± SD	138.60 ± 20.44	137.79 ± 19.05	139.00 ± 21.12	0.664
Mean DBP (mmHg), mean ± SD	76.12 ± 11.48	77.20 ± 11.29	75.60 ± 11.57	0.307
Triglycerides (mmol/L), median [P25-P75]	1.29 [0.90–1.84]	1.31 [0.86–1.84]	1.25 [0.92–1.85]	0.832
Total cholesterol (mmol/L), mean ± SD	4.36 ± 1.30	4.22 ± 1.18	4.43 ± 1.35	0.245
HDL-C (mmol/L), mean ± SD	1.16 ± 0.32	1.21 ± 0.29	1.14 ± 0.33	0.107
LDL-C (mmol/L), mean ± SD	2.36 ± 0.91	2.27 ± 0.91	2.40 ± 0.90	0.319
Fasting glucose(mmol/L), median [P25-P75]	6.61 [5.65–8.39]	6.62 [5.70–8.10]	6.61 [5.53–8.62]	0.738
Hypertension, N (%)	199 (81.2%)	63 (78.8%)	136 (82.4%)	0.49
Smoking
Current smoking, N (%)	50 (20.4%)	10 (12.5%)	40 (24.2%)	0.032
Former smoker, N (%)	40 (16.3%)	15 (18.8%)	25 (15.2%)	0.475
Assessment of atherosclerosis
CAD, N (%)	165 (67.3%)
Gensini score, median [P25-P75]	12.5 [5-29.8]	3.5 [1.00–7.00]	20 [12-41.5]	< 0.001
Femoral plaques, N (%)	161 (65.7%)	42 (52.5%)	119 (72.1%)	0.002
C-IMT (mm), median [P25-P75]	0.83 [0.8-1]	0.80 [0.80–0.9]	0.85 [0.80–1.05]	0.077
CPS, median [P25-P75]	2.2 [0-5.15]	0 [0-2.1]	3.60 [1.60–5.80]	< 0.001

Risk Factors Of Coronary Artery Disease

To further explore the possible risk factors for coronary artery stenosis, univariate and multivariate logistic regression analyses were applied (Table 3). Univariate Logistic regression analyses showed that risk factors associated with CAD included smoking, femoral plaques, C-IMT and CPS (all p < 0.05). Additionally, after adjusting for all traditional risk covariates, multiple regression analyses showed that smoking, femoral plaques, and CPS significantly correlated with CAD.

Table 3

Logistic regression analysis of factors associated with the presence of CAD
Variables	Univariate		Multivariate
Variables	OR (95%CI)	p value	OR (95%CI)	p value
Smoking	2.240(1.056–4.752)	0.036	2.816(1.143–6.938)	0.024
Femoral plaques	2.341(1.343–4.078)	0.003	1.965(1.081–3.569)	0.027
C-IMT	3.739(1.023–13.669)	0.046	2.096(0.489–8.988)	0.319
CPS	1.370(1.210–1.552)	< 0.001	1.346(1.177–1.540)	< 0.001

Predictive Values Of Arterial Measures For Cad

To better evaluate the predictive value of peripheral arterial measurements for CAD, we developed a BASELINE model that included all covariates: gender, age, BMI, alcohol consumption history, mean systolic and diastolic blood pressure, TG, TC, HDL-C, LDL-C, fasting blood glucose, duration of diabetes, hypertension, and smoking status. The ROC area under the curve (AUC) curve for identifying CAD were compared between BASELINE model, femoral plaques, C-IMT, and CPS measurements (Fig. 2). Carotid plaque score yielded the highest AUC for identifying participants with CAD (AUC = 0.7323), higher than the BASELINE model (AUC = 0.6677). The AUC values of femoral artery plaque and C-IMT for CAD prediction were comparable and lower than 0.7, which was at a low level.

The ROC analysis displayed that the cut-off value of CPS was 2.45, 61.82% of sensitivity,81.25% of Specificity and 0.4307 of Yoden index could predict CAD, and the area under the ROC curve was 0.7323 (95% CI 0.665– 0.8, p < 0.001, Fig. 2).

Associations Of Peripheral Atherosclerosis Measurement With The Severity Of Cad

For analyze the relationship between carotid plaque score, femoral plaque and CAD severity, patients were further divided into three subgroups according to the tertiles of Gensini score, including no or mild (n = 73), moderate (n = 89) and severe (n = 83). Calculated CPS values had significant difference among three groups with the increasing of Gensini score, 0 [0–2.1] for no or mild group, 2.1 [0–4.4] for the moderate group and 4.7 [2.8– 6.6] for the severe group, expressed as the median [25%-75%] (Fig. 3a). Moderate group and severe group of CPS calculation value was significantly higher than no or mild group (adjusted p＜0.05 and adjusted p＜0.001, respectively). Compared with the moderate group, the calculated CPS values of the severe group were significantly higher (adjusted p＜0.001) (Fig. 3a) .

The mean C-IMT values were 0.8 [0.75–0.9] for no or mild group, 0.8 [0.8–1.1] for the moderate group and 0.9 [0.8–1.1] for the severe group, respectively, expressed as the median [25%-75%] (Fig. 3b). Figure 3b indicate that the mean C-IMT among the three groups grouped according to CAD severity, only the difference between no or mild group and severe group was statistically significant (adjusted p＜0.001).

As shown in Fig. 3c, with the increasing of Gensini score, a stepwise upward trend was observed in the proportion of femoral plaque,42.5% for no or mild group, 71.9% for the moderate group and 79.5%for the severe group. The differences between no or mild and severe groups and between no or mild and severe groups were statistically significant (all p＜0.001). Although the prevalence of femoral artery plaque in the severe group was higher than that in the moderate group, there was no statistical significance (p > 0.05).

The novelty of this study lies in the combination of the duration of diabetes, that is, in patients with more than 5 years of illness, re-valuate the ability of different peripheral atherosclerosis measurement methods in predicting the existence of CAD and correlation with the severity of CAD. It was found that femoral plaque and carotid plaque score were independent predictors of CAD in this specific population. We also found that the carotid plaque score was correlated with the severity of CAD, and the femoral plaque had a higher positive rate in patients with moderate to severe CAD, which suggests that it has unique value in identifying moderate to severe CAD.

Our data show the association of traditional cardiovascular risk factors and noninvasive atherosclerosis measures with coronary artery disease. In addition to smoking, other risk factors such as sex, age, blood pressure, various lipid metabolism, BMI, etc. have lost their relationship with CAD. However, non-invasive peripheral arterial measures, including femoral plaque, C-IMT, and carotid plaque scores were all associated with the presence of CAD. The associations of femoral plaque and carotid scores remained, after adjustment for traditional risk factors. This might indicate that noninvasive peripheral atherosclerosis measures are a more useful as a predictive marker of CAD than traditional risk factors.

Femoral plaque has the highest odds ratio for predicting CAD. This is the same as the conclusion that in the autopsy studies, the presence of femoral artery plaques was much more strongly correlated with coronary artery plaques and coronary artery death than plaques in the common carotid artery [18, 19].

Notably, the AUC of the carotid plaque score was much higher than that of the femoral plaque in identifying patients with CAD. The reason may be that we used the carotid plaque score to further measure the severity of carotid plaque, rather than simply defining presence or absence.

In a study of 501 patients who completed carotid ultrasonography and first coronary angiography, Nobutaka Ikeda et al demonstrated that CPS was an excellent predictor of the presence of CAD, the areas under the ROC curves for CPS to predict the presence of coronary artery disease was 0.756 (95% CI: 0.713–0.798; p < 0.0001) [6].Similarly, in the present study we found that CPS was useful in identifying CAD, the AUC values of CPS for CAD prediction was 0.7323 (95% CI 0.665– 0.8, p < 0.001), which was close to their result. The present study demonstrates the comparatively increased utility of calculated CPS over femoral plaque for identifying patients with significant CAD. CPS demonstrated a high specificity (81.25%) but relatively low sensitivity (61.82%) for CAD detection.

The predictive value of carotid intima-media thickness for CAD is controversial [20]. Although some prospective studies have shown that it increases the predictive power of traditional risk prediction models [6, 21, 22], others cannot confirm this [23]. Therefore, the 2013 American College of Cardiology (ACC) / American Heart Association (AHA) guidelines for CVD risk prediction no longer recommend this method [24].Our results suggest that C-IMT is not an independent risk factor for CAD in patients with long-term diabetes and has the lowest ability to predict CAD.

Many previous studies have demonstrated the relationship between noninvasive atherosclerosis measurements and the prevalence or severity of coronary artery disease. However, the assessment of disease severity was limited to the number of coronary artery stenosis, and failed to take into account the complexity of coronary artery disease [25]. The Gensini score considers three main parameters of each coronary artery lesion: severity score, region multiplying factor and collateral adjustment factor to characterize the complexity of coronary heart disease, which was first described by Goffredo G. Gensini in 1975 [17]. It is a widely used angiographic scoring system. We divided the subjects into no or mild group, moderate group, and severe group according to the third quartile of Gensini score. We found that with the increase of severity of coronary stenosis, there was a significant difference in the calculated value of CPS in each group. It suggests that the calculated value of CPS has a good correlation with the severity of coronary artery, which can be used as a predictor of the severity of CAD.

Some previous studies have shown that femoral artery plaques are associated with advanced or severe CAD, which can be used as a surrogate index for coronary atherosclerosis research [26, 27]. In our study, 71.9% and 79.5% of the moderate CAD group and the severe CAD group showed positive femoral artery plaque, compared with 42.5% in the no or mild CAD group. This suggests that femoral artery plaque is more correlated with moderate to severe CAD, which is also consistent with previous findings in the general population [28].Importantly, this measurement is based on a relatively rough but direct assessment of the presence or absence of atherosclerotic plaques, which is easier to obtain than the carotid plaque score.

Strengths and limitations

Our study had several limitations. First, since the participants in our study are all hospitalized patients, the cardiovascular risk of these subjects may be relatively higher than that of the healthy population. Therefore, it is not clear whether our results are useful for screening long-term T2DM patients who are generally asymptomatic. In addition, age, lipid metabolism disorder, hypertension and other risk factors have lost their correlation with CAD, which may be affected by this selection bias. Second, the modified Gensini score is used, which actually does not take into account the compensation of collateral circulation, so it can be biased in the assessment of the severity of CAD. However, the essential purpose of this study was to evaluate the relationship between extracoronary atherosclerosis and coronary atherosclerosis, so ignoring collateral circulation compensation may not affect our final results.

In conclusion, both carotid plaque score and femoral plaque were independent predictors of CAD. In patients with long-term T2DM, compared with femoral plaque and C-IMT, CPS has a higher ability to predict the occurrence and severity of CAD. However, femoral artery plaque has its special value in predicting moderate to severe CAD.

ASCVD: atherosclerotic cardiovascular disease

BMI: body mass index

CAD: coronary artery disease

CPS: carotid plaque score

C-IMT: carotid intima-media thickness

CCA: common carotid artery

DBP: diastolic blood pressure

GS: gensini score

HDL-C: high-density lipoprotein

ICA: internal carotid arteries

IMT: intima-media thickness

LDL-C: low-density lipoprotein cholesterol

ROC: receiver operating characteristic

SBP: systolic blood pressure

TG: triglycerides

TC: total cholesterol

T2DM: type 2 diabetes mellitus

Availability of data materials

The data generated and/or analyzed during the current study are available from the corresponding author on reasonable request.

Acknowledgements

Not applicable.

Author contributions

WC was the primary person responsible for the conduct of the study and data analysis, and wrote, reviewed, and edited the manuscript. LW contributed to editing the manuscript. SZ, BH and YZ made the figures. YM and ZZ especially contributed to the discussion. All authors reviewed the manuscript. All authors read and approved the final manuscript.

Funding

This work was supported by the Science and Technique Plans of Ningbo City (Grant No. 2019C50080)

Ethics approval and consent to participate

The studies involving human participants were reviewed and approved by medical ethics committee of Affiliated Hospital of Medical College of Ningbo University. Written informed consent for participation was waived for this study by medical ethics committee of Affiliated Hospital of Medical College of Ningbo University due to the retrospective nature of the study. The study is conducted in accordance with the requirements of the Declaration of Helsinki of the World Medical Association.

Consent for publication

Not applicable.

Competing interests

No potential conflicts of interest relevant to this article were reported.

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No competing interests reported.

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Predictive value of noninvasive peripheral atherosclerosis measurement for coronary artery disease in patients with long T2DM duration

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Abstract

Background

Methods

Results

Conclusion

Figures

Background

Methods

Study population

Measurements

Clinical characteristics and laboratory data

Femoral And Carotid Atherosclerosis Assessment By Ultrasound And Carotid Plaque Score

The Gensini Score And Angiographic Analysis:

Statistical analysis

Results

Study population characteristics

Risk Factors Of Coronary Artery Disease

Predictive Values Of Arterial Measures For Cad

Associations Of Peripheral Atherosclerosis Measurement With The Severity Of Cad

Discussion

Conclusions

Abbreviations

Declarations

References

Additional Declarations

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