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Original Article
Complications Color Doppler Ultrasonography Is a Useful Tool for Diagnosis of Peripheral Artery Disease in Type 2 Diabetes Mellitus Patients with Ankle-Brachial Index 0.91 to 1.40
Kyu Yeon Hur1, Ji Eun Jun1, Young Ju Choi2, Yong-ho Lee3, Dae Jung Kim4, Seok Won Park5, Byung Wook Huh2, Eun Jig Lee3, Sun-Ha Jee6, Kap Bum Huh2, Sung Hee Choi7orcid
Diabetes & Metabolism Journal 2018;42(1):63-73.
DOI: https://doi.org/10.4093/dmj.2018.42.1.63
Published online: February 23, 2018
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1Division of Endocrinology and Metabolism, Department of Medicine, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Korea.

2Huh's Diabetes Center and 21st Century Diabetes and Vascular Research Institute, Seoul, Korea.

3Division of Endocrinology and Metabolism, Department of Internal Medicine, Yonsei University College of Medicine, Seoul, Korea.

4Department of Endocrinology and Metabolism, Ajou University School of Medicine, Suwon, Korea.

5Department of Internal Medicine, CHA University School of Medicine, Seongnam, Korea.

6Department of Epidemiology and Health Promotion, Institute for Health Promotion, Yonsei University Graduate School of Public Health, Seoul, Korea.

7Department of Internal Medicine, Seoul National University Bundang Hospital, Seoul National University College of Medicine, Seongnam, Korea.

corresp_icon Corresponding author: Sung Hee Choi. Department of Internal Medicine, Seoul National University Bundang Hospital, Seoul National University College of Medicine, 82 Gumi-ro 173beon-gil, Bundang-gu, Seongnam 13620, Korea. drshchoi@snu.ac.kr
*Kyu Yeon Hur and Ji Eun Jun contributed equally to this study as first authors.
• Received: November 30, 2017   • Accepted: February 1, 2018

Copyright © 2018 Korean Diabetes Association

This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/4.0/) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.

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  • Background
    The clinical utility of ankle-brachial index (ABI) is not clear in subjects with less severe or calcified vessel. Therefore, we investigated the usefulness of color Doppler ultrasonography for diagnosing peripheral artery disease (PAD) in type 2 diabetes mellitus (T2DM) subjects.
  • Methods
    We analyzed 324 T2DM patients who concurrently underwent ABI and carotid intima-media thickness (CIMT) measurements and color Doppler ultrasonography from 2003 to 2006. The degree of stenosis in patients with PAD was determined according to Jager's criteria, and PAD was defined as grade III (50% to 99% stenosis) or IV stenosis (100% stenosis) by color Doppler ultrasonography. Logistic regression analysis and receiver operating characteristic curve analysis were performed to evaluate the risk factors for PAD in patients with ABI 0.91 to 1.40.
  • Results
    Among the 324 patients, 77 (23.8%) had ABI 0.91 to 1.40 but were diagnosed with PAD. Color Doppler ultrasonography demonstrated that suprapopliteal arterial stenosis, bilateral lesions, and multivessel involvement were less common in PAD patients with ABI 0.91 to 1.40 than in those with ABI ≤0.90. A multivariate logistic regression analysis demonstrated that older age, current smoking status, presence of leg symptoms, and high CIMT were significantly associated with the presence of PAD in patients with ABI 0.91 to 1.40 after adjusting for conventional risk factors. CIMT showed significant power in predicting the presence of PAD in patients with ABI 0.91 to 1.40.
  • Conclusion
    Color Doppler ultrasonography is a useful tool for the detection of PAD in T2DM patients with ABI 0.91 to 1.40 but a high CIMT.
Peripheral artery disease (PAD) is a condition characterized by atherosclerotic occlusive disease of the lower extremities. The prevalence of PAD is increased with advanced age, cigarette smoking, diabetes mellitus (DM), dyslipidemia, and hypertension [123]. PAD is a major risk factor for coronary and cerebrovascular events, including myocardial infarction, stroke, and death, secondary to systemic atherothrombosis [34]. PAD is rarely an isolated condition, but rather a manifestation of systemic atherosclerosis in other vascular beds, including the coronary and carotid arteries in patients with DM [35]. PAD is 3- to 4-fold higher in incidence and more extensive but less symptomatic in patients with DM compared with normal subjects [16]. Notably, because the rate of limb amputation due to PAD is significantly higher in patients with DM [7], early detection of asymptomatic PAD in patients with DM has important implications in clinical practice.
Although non-invasive and simple diagnostic tests are readily available, PAD remains significantly underestimated and untreated [8], mostly because of the paucity of symptoms and underutilization of screening tools. The American Diabetes Association Consensus Statement recommends that a screening ankle-brachial index (ABI) should be performed in diabetes patients with symptoms or signs of PAD [9]. However, the accuracy of the ABI is controversial when used to evaluate calcified and poorly compressible vessels in elderly patients with medial sclerosis. The ABI may also be falsely negative in symptomatic patients with moderate aortoiliac stenosis or extensive collaterals [10]. Therefore, various imaging tools, such as color Doppler ultrasonography, magnetic resonance angiography (MRA), and computed tomography angiography (CTA) have been used to diagnose suspicious PAD despite a normal ABI [11]. Although all of these tests are non-invasive, color Doppler ultrasonography provides renal protection because contrast dye is not used, compared with MRA or CTA. A previous study also reported that hand-held Doppler has the greatest diagnostic accuracy in patients with PAD, while clinical findings including claudication, femoral bruit, and pulse abnormalities are insufficient to diagnose PAD [12].
Carotid intima-media thickness (CIMT), which is easily assessed by B-mode ultrasound, is an indicator of generalized atherosclerosis and a potentially effective tool to predict vascular complications in patients with DM [13]. In fact, an increased CIMT is related to a higher risk of PAD detected by ABI and claudication [1415].
This study assessed the utility of color Doppler ultrasonography to detect PAD in type 2 diabetes mellitus (T2DM) patients with ABI 0.91 to 1.40. In addition, we investigated the usefulness of CIMT in predicting the presence of PAD in DM patients with ABI 0.91 to 1.40.
Subjects
This was a single center, retrospective study performed at Huh's Diabetes Center in Seoul, Republic of Korea. Among the patients who visited this clinic from January 2003 to December 2006, we analyzed 324 T2DM patients over 50 years of age, and their vascular stenosis was concurrently evaluated by the ABI, color Doppler ultrasonography, and CIMT. Subjects who had a previous history of ketoacidosis, serum fasting C-peptide level ≤0.5 ng/mL, history of cardiovascular disease (CVD) including stroke, myocardial infarction, any coronary revascularization or surgery due to chest pain and hospitalization due to heart failure, history of PAD, or a diagnosis of an orthopedic disease in the lumbar spine were excluded. All subjects were categorized into three groups according to their leg symptoms: the asymptomatic, typical, and atypical symptomatic groups. The typical symptomatic group included patients with symptomatic claudication, resting pain, and necrosis or gangrene, which are compatible with typical symptoms in the Fontaine staging system [16]. The atypical symptomatic group included patients with vague pain, which was difficult to distinguish from symptoms of peripheral neuropathy. This study was approved by the Institutional Review Board of Yonsei University (IRB No. 4-2017-0288). Due to the retrospective nature of this study, the requirement for written informed consent was waived.
Measurement of anthropometric and biochemical parameters
Height (cm) and body weight (kg) were measured to the nearest 0.1 cm and 0.1 kg, respectively, in barefoot subjects wearing light clothing. Body mass index (BMI) was calculated as weight divided by height squared (kg/m2). Waist circumference was measured to the nearest 0.1 cm at the narrowest point between the lower limit of the ribcage and the iliac crest. Blood pressure (BP) was recorded using a mercury sphygmomanometer on the right arm with the subject in the sitting position. Two readings were taken 5 minutes apart, and the mean value was used. All patients were asked about their smoking history and were classified as never-smokers, ex-smokers, or current smokers using a structured questionnaire. Subjects were also asked to refrain from smoking for 24 hours and from consuming alcohol for 7 days before the blood sampling.
After a 14-hour overnight fast, venous blood samples were drawn from the antecubital vein between 7:00 AM and 9:00 AM. Plasma was separated immediately by centrifugation (2,000 rpm, 20 minutes, at 4℃), and biochemical measurements were determined immediately. Fasting plasma concentrations of glucose, total cholesterol, triglycerides, and high density lipoprotein cholesterol and low density lipoprotein cholesterol were measured enzymatically using the Hitachi 747 chemical analyzer (Hitachi, Tokyo, Japan). The glycosylated hemoglobin (HbA1c) value was determined using a high-performance liquid chromatography method (Varient II; Green-cross, Seoul, Korea). Fasting and 2-hour postprandial C-peptide levels were measured by double-antibody radioimmunoassay (DiaSorin, Stillwater, MN, USA).
Ankle-brachial index
A non-invasive screening device (VP-1000; Colin Medical Technology Corp., Komaki, Japan) was used to measure the ABI. All patients were allowed to rest for at least 5 minutes before the measurements. The American College of Cardiology/American Heart Association (ACC/AHA) guidelines [17] recommend selecting the higher of the two arm pressures (brachial) and the higher of the two ankle pressures (anterior tibial/dorsalis pedis or posterior tibial) to calculate the ABI. The lower of the two ABI values was used for the analysis. According to the ACC/AHA recommendations the ABI value was classified as follows: normal, 1.00 to 1.40; borderline, 0.91 to 0.99; abnormal, ≤0.90 (mild, 0.70 to 0.90; moderate, 0.40 to 0.69; severe, <0.40); and poorly compressible >1.40 [17].
Peripheral color Doppler ultrasonography
All Doppler studies were performed by a single radiologist using color Doppler ultrasonography (Logic 7; General Electronics, Milwaukee, WI, USA). Information on the presence and grade of stenosis, post-stenotic turbulence, peak systolic velocity, end diastolic velocity, and the presence of collaterals and their flow characteristics were assessed on color Doppler imaging. The degree of stenosis was graded according to Jager's criteria. Normal, triphasic waveform with thin spectral band. Grade I, 1% to 19% stenosis: normal triphasic flow with normal peak systolic velocity with spectral broadening. Grade II, 20% to 49% stenosis: triphasic waveform with an increase in peak systolic velocity ≥30% with respect to the proximal recording site. Marked spectral broadening. Grade III, 50% to 99% stenosis: monophasic waveform with an increase in peak systolic velocity ≥100% and marked spectral broadening. Distal waveform is abnormal. Grade IV, 100% stenosis: no forward flow detected with altered flow patterns both proximal and distal to the stenosis [18]. Grade III and IV stenoses were defined as PAD in this study.
Carotid intima-media thickness
Both carotid arteries were scanned by a single experienced examiner using high-resolution real-time B mode ultrasonography with a 10 MHZ probe (LOGIQ 7; General Electronics), as previously described [19]. The CIMT was defined as the distance between the lumen-intima and media-adventitia interfaces [20]. CIMT was measured at three points on the far wall in sections (1 cm long) of the common carotid artery in the proximity of the carotid bulb. The mean of six measurements from the right and left carotid arteries was used as the mean CIMT [21].
Statistical analysis
Normally distributed data are expressed as mean±standard deviation, and categorical variables are expressed as percentages. One-way analysis of variance or Student t-test was used to compare continuous variables, and the chi-square test was used to compare categorical variables. Logistic regression analyses were performed using the enter method to identify the risk factors for PAD in patients with ABI 0.91 to 1.40. Receiver operating characteristic (ROC) analysis was performed to assess the utility of CIMT in predicting PAD in symptomatic and asymptomatic patients with ABI 0.91 to 1.40. All statistical tests were two-sided, and analyses were executed using SPSS for Windows version 23.0 (IBM Co., Armonk, NY, USA). A P value <0.05 was considered significant.
Baseline clinical characteristics
A total of 324 patients were analyzed in this study (male: female=192:132). The mean age of all subjects was 62.5±7.3 years, and BMI was 24.5±2.9 kg/m2. Mean DM duration was 11.4±7.3 years, and the mean HbA1c was 8.4%±1.8%.
Table 1 shows the clinical characteristics of the subjects with and without PAD. The PAD group was older, more likely male, and lower in BMI. The PAD group had more current smokers and a longer duration of DM. Other metabolic parameters, including fasting plasma glucose levels, lipid levels, and waist circumference, did not differ between the groups. Systolic and diastolic BP was higher, and leg symptoms were more common, in the PAD group. The proportions of abnormal or borderline ABI were higher in PAD group, compared with non-PAD group. The mean CIMT was also significantly higher in the PAD group, compared with non-PAD group.
Comparison of anatomical characteristics between the patients with ABI 0.91 to 1.40 vs. ≤0.90 among patients with PAD
The clinical presentation of PAD according to the ABI and color Doppler ultrasonography results is detailed in Fig. 1. Among the 324 patients, only 18 (5.6%) had an abnormally low ABI (≤0.90) and the other 306 (94.4%) had ABI 0.91 to 1.40. However, color Doppler ultrasonography demonstrated that 93 (28.7%) had PAD. Among the 93 patients diagnosed with PAD by Doppler ultrasonography, only 16 (17.2%) had an abnormally low ABI, and 77 (82.8%) had ABI 0.91 to 1.40. Among the 306 patients with ABI 0.91 to 1.40, 34 (11.1%) had grade III (50% to 99% stenosis) lesions, and 43 (14.1%) had grade IV (100% stenosis) lesions on color Doppler ultrasonography (Fig. 2). These results suggest that the ABI has the potential to underestimate the presence of PAD.
Next, we compared the characteristics of the stenotic lesions between ABI 0.91 to 1.40 and ABI ≤0.90 among the patients with PAD (Table 2). Multiple stenotic lesions were less frequent in ABI 0.91 to 1.40 group than in ABI ≤0.90 group. Although stenotic lesions occurred most frequently in the infrapopliteal arteries, such as the anterior and posterior tibial arteries, in both groups, stenosis of the common femoral (14.3% vs. 37.5%, P=0.029) or superficial femoral (22.1% vs. 32.0%, P=0.022) arteries was less frequent in ABI 0.91 to 1.40 group than in ABI ≤0.90 group. Bilateral stenosis was also less common in ABI 0.91 to 1.40 group than in ABI ≤0.90 group (64.9% vs. 93.8%, P=0.022). Collectively, multiple, proximal, and bilateral arterial stenoses were less common in ABI 0.91 to 1.40 group than in ABI ≤0.90 group, suggesting that the ABI alone potentially underestimates PAD if the stenotic lesions are less extensive, distal, or unilateral.
Comparison of clinical characteristics between the patients with ABI 0.91 to 1.40 vs. ≤0.90 among the patients with PAD
We compared the clinical characteristics between patients with ABI 0.91 to 1.40 versus ≤0.90 among patients with PAD (Table 3). No significant differences in age, sex, or BMI were observed between the groups. In addition, no significant differences in BP, HbA1c, lipid profile, or smoking history were observed between the groups. However, ABI ≤0.90 group had a longer duration of DM, more frequent insulin use, and more frequent leg symptoms compared with those in ABI 0.91 to 1.40 group. Although the mean CIMT was significantly higher in patients with PAD than in those without PAD (1.03±0.27 mm vs. 0.90±0.19 mm, P<0.001) (Table 1), no difference in CIMT was observed between the patients with ABI 0.91 to 1.40 and ≤0.90 among the patients with PAD (Table 3).
Risk factors associated with PAD among the patients with ABI 0.91 to 1.40
The ABI is a more accessible tool for screening PAD in the clinical setting than is color Doppler ultrasonography. However, it has the potential to underestimate the presence of PAD, which may delay proper management. If we could find out the characteristics of the patients with PAD who had ABI 0.91 to 1.40, further vascular evaluation could be recommended for them. Thus, we investigated the risk factors associated with the presence of PAD in the 306 patients with ABI 0.91 to 1.40. Univariate analysis demonstrated that older age, a longer duration of DM, current smoking status, leg symptoms, and a higher mean CIMT were associated with the presence of PAD in patients with ABI 0.91 to 1.40 (Table 4). In the multivariate analysis, we adjusted for age, sex, BMI, systolic BP, DM duration, current smoking status, HbA1c, total cholesterol, presence of leg symptoms, and mean CIMT (Table 4). The results demonstrated that age per 10 years (odds ratio [OR], 1.86; 95% confidence interval [CI], 1.18 to 2.93; P=0.008), current smoking status (OR, 2.62; 95% CI, 1.10 to 6.21; P=0.029), leg symptoms (OR, 7.35; 95% CI; 3.71 to 14.57; P<0.001), and mean CIMT (OR, 4.73; 95% CI, 1.14 to 19.57; P=0.032) were significantly associated with the presence of PAD in these patients (Table 4). After adjusting for age as a categorical variable in the multivariate analysis, age ≥70 years was significantly associated with a higher risk of PAD (OR, 3.08; 95% CI, 1.23 to 7.69; P=0.016) compared with age <60 years. There was no difference in the risk of PAD between the 60 to 69 and <60-year age groups (OR, 2.04; 95% CI, 0.97 to 4.30; P=0.061) (data not shown).
The cut-off CIMT value to predict the presence of PAD was 0.92 mm, with a 62.3% sensitivity and 59.0% specificity. ROC analysis demonstrated that the area under the curve was 0.69 (95% CI, 0.56 to 0.83; P=0.010) for the symptomatic patients (Fig. 3A) and 0.68 (95% CI, 0.61 to 0.76; P=0.001) for the asymptomatic patients (Fig. 3B). Collectively, these results suggest that older age (≥70 years), current smoking status, presence of leg symptoms, high mean CIMT (>0.92 mm) were factors associated with the presence of PAD, even in patients with ABI 0.91 to 1.40.
PAD is strongly associated with cardiovascular mortality and lower extremity amputation in patients with DM. The use of ABI is commonly recommended in screening for PAD in patients with DM. However, our study demonstrated that 25.2% of patients with DM and ABI 0.91 to 1.40 were diagnosed with PAD by color Doppler ultrasonography. Older age, current smoking status, presence of leg symptoms, and high CIMT were significantly associated with the presence of PAD in patients with ABI 0.91 to 1.40.
The prevalence of PAD detected by the ABI was previously reported to be 20% in a population with DM [22], and reached 29% in older diabetes patients over 50 years of age [23]. An Asian study (PAD-SEARCH) showed that the prevalence of PAD was 17.7%, but this rate varied (12% to 32%) depending on the region. The prevalence of PAD in Koreans over 50 years of age was 12% from the 1980s to the 1990s, which is lower compared with other regions [24]. The difference may be associated with the heterogeneity of the study participants as well as the limitations of the ABI, which can underestimate the prevalence of PAD. Our results also demonstrate different prevalence rates of PAD according to the detection method used (5.6% by ABI vs. 28.7% by color Doppler ultrasonography).
Among subjects who have ABI 0.91 to 1.40 but are diagnosed with PAD, only 39.8% showed typical leg symptoms of PAD in this study. This result supports a previous study that the proportion of asymptomatic PAD is significantly higher among subjects with DM than among normal subjects [25]. Approximately 27% of patients with PAD demonstrate a progression of symptoms over a 5-year period, with limb loss occurring in 4% [26]. Patients with DM and claudication show an overall 20% amputation risk and a 50% 5-year mortality rate [27]. Considering the impact of PAD on the mortality and morbidity of patients with DM, early diagnosis and proper management of PAD are important, even in asymptomatic patients.
ABI value of 0.91 to 0.99 is defined as a borderline [17] and is known to be associated with an increased risk of PAD [28], endothelial dysfunction [29], and hard CVD events [3031], compared with a normal ABI (1.00 to 1.40). Our study also showed that the proportion of borderline ABI was higher in PAD group compared with non-PAD group (10.4% vs. 3.1%, P=0.010) in Table 1. However, among 77 patients who have ABI 0.91 to 1.40 and PAD, only eight patients (53.3%) had a borderline ABI and the other 69 patients (23.7%) had a normal ABI. This results suggests that not only a borderline ABI but also a normal ABI cannot exclude the possibility of detecting PAD by color Doppler ultrasonography. Since the ABI has limited sensitivity and a large number of DM patients are asymptomatic, we may consider the further vascular evaluation to detect PAD for not only for the symptomatic but also for the asymptomatic patients who have ABI 0.91 to 1.40 and known risk factors.
Color Doppler ultrasonography is a good vascular imaging technology because of its noninvasiveness, safety, and accuracy [32]. It visualizes vessels directly and provides data regarding anatomical localization, the degree of stenosis, and hemodynamics. One study reported that color Doppler ultrasonography has an 80% to 98% sensitivity and 89% to 99% specificity for diagnosis of PAD [33]. A previous study reported that the prevalence of PAD, as detected by color Doppler ultrasonography, was 24% in patients with DM, male predominance, and a tendency for multisegmental and infrapopliteal artery involvement [34].
CIMT measured by high-resolution ultrasonography is a good marker of generalized atherosclerosis [3536]. CIMT was positively associated with the prevalence of PAD [37], and found to be an independent predictor of peripheral revascularization [38]. Our study also reported that a high CIMT was significantly associated with the presence of PAD in patients with ABI 0.91 to 1.40, independent of leg symptoms or known risk factors such as age, sex, smoking, hypertension, and lipid levels. Thus, color Doppler ultrasonography may be useful for detecting PAD in patients with ABI 0.91 to 1.40 and a high CIMT, regardless of leg symptoms.
This study had several limitations that should be considered. First, the subjects may not be representative of the general population, because they were enrolled from a single diabetes center, and may have had asymptomatic CVD that was not excluded at the enrollment. Second, we could not specify orthopedic diseases in the lumbar spine such as spinal stenosis, any spinal operation, or compression fracture due to lack of the data. Lastly, there were also lack of data on the use of anti-platelet agents, changes in statin or anti-hypertensive medications, even though these factors may affect vascular function. However, the strength of this study is that we identified the utility of color Doppler ultrasonography in detecting PAD, especially in patients with a normal or borderline ABI.
In conclusion, color Doppler ultrasonography could be useful for the detection of PAD among patients with DM and a normal or borderline ABI. Color Doppler ultrasonography could be considered for not only symptomatic but also asymptomatic patients who have ABI 0.91 to 1.40 and a high CIMT.
Acknowledgements
This work was supported by a grant from the Seoul R&BD Program, Republic of Korea (10526). Kyu Yeon Hur is the recipient of grants from Samsung Medical Center (#CRP1500057).

CONFLICTS OF INTEREST: No potential conflict of interest relevant to this article was reported.

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Fig. 1

Flow chart presenting the study subjects. ABI, ankle-brachial index; PAD, peripheral artery disease.

dmj-42-63-g001.jpg
Fig. 2

Degree of stenosis on color Doppler ultrasonography in patients with ankle-brachial index 0.91 to 1.40 (n=306). Grade III and IV stenoses were defined as peripheral artery disease and expressed with gray bars.

dmj-42-63-g002.jpg
Fig. 3

Receiver operating characteristic curves for carotid intima-media thickness (CIMT) for predicting peripheral artery disease (PAD) in 306 patients with ankle-brachial index 0.91 to 1.40. (A) The area under the curve for CIMT for predicting PAD in symptomatic type 2 diabetes mellitus (T2DM) patients (n=62). (B) The area under the curve (AUC) for CIMT for predicting PAD in asymptomatic T2DM patients (n=244).

dmj-42-63-g003.jpg
Table 1

Clinical characteristics of type 2 diabetes mellitus patients with and without PAD diagnosed by color Doppler ultrasonography (n=324)

dmj-42-63-i001.jpg
Characteristic Total PAD (−) PAD (+) P value
No. of patients 324 231 (71.3) 93 (28.7)
Age, yr 62.5±7.3 61.2±6.9 65.8±7.2 <0.001
Male sex 192 (59.3) 129 (55.8) 63 (67.7) 0.049
BMI, kg/m2 24.5±2.9 24.7±2.9 23.9±2.7 0.018
Waist circumference, cm 84.9±7.6 85.1±7.9 84.5±6.9 0.562
Systolic BP, mm Hg 141.4±19.3 139.9±18.4 145.1±21.1 0.028
Diastolic BP, mm Hg 87.1±11.0 85.0±12.2 87.9±10.4 0.031
DM duration, yr 11.4±7.3 10.5±6.6 13.5±8.4 0.001
Current smoker 52 (16.0) 31 (13.4) 21 (22.6) 0.002
Use of insulin 59 (18.2) 37 (16.0) 22 (23.7) 0.107
Use of statins 50 (15.4) 33 (14.3) 17 (18.3) 0.368
Use of anti-hypertensive drugs 110 (34.0) 76 (32.9) 34 (36.6) 0.529
HbA1c, % 8.4±1.8 8.4±1.8 8.5±1.7 0.741
Fasting glucose, mg/dL 163.3±57.0 164.1±56.1 161.4±59.6 0.701
Total cholesterol, mg/dL 193.4±41.5 193.1±42.6 194.2±38.7 0.831
Triglycerides, mg/dL 148.5±95.1 153.6±107.0 135.8±53.3 0.131
HDL-C, mg/dL 49.6±14.5 50.3±14.7 48.0±13.8 0.183
LDL-C, mg/dL 113.5±35.5 111.4±36.5 118.9±32.5 0.103
Leg symptoms (yes)
 Typical 43 (13.3) 6 (2.6) 37 (39.8) <0.001
 Atypical 31 (9.6) 19 (8.2) 12 (12.9) 0.006
ABI
 ≤0.90 (abnormal) 18 (5.6) 2 (11.1) 16 (88.9) <0.001
 0.91–0.99 (borderline) 15 (4.6) 7 (46.7) 8 (53.3) 0.010
Mean CIMT, mm 0.94±0.23 0.90±0.19 1.03±0.27 <0.001

Values are presented as number (%) or mean±standard deviation.

PAD, peripheral artery disease; BMI, body mass index; BP, blood pressure; DM, diabetes mellitus; HbA1c, glycosylated hemoglobin; HDL-C, high density lipoprotein cholesterol; LDL-C, low density lipoprotein cholesterol; ABI, ankle-brachial index; CIMT, carotid intima-media thickness.

Table 2

Comparison of anatomical characteristics of patients with ABI 0.91 to 1.40 vs. ABI ≤0.90 among the patients diagnosed with PAD by color Doppler ultrasonography (n=93)

dmj-42-63-i002.jpg
Anatomical characteristic ABI
0.91–1.40 ≤0.90 P value
No. of patients 77 (82.8) 16 (17.2)
No. of stenoses 2 (1–4) 4 (2–5) 0.005
Location of stenosis
 Common iliac artery 8 (10.4) 3 (18.8) 0.346
 Common femoral artery 11 (14.3) 6 (37.5) 0.029
 Superficial femoral artery 17 (22.1) 8 (32.0) 0.022
 Deep femoral artery 10 (13.0) 4 (25.0) 0.221
 Popliteal artery 11 (14.3) 5 (31.3) 0.102
 Anterior tibial artery 53 (68.8) 13 (81.3) 0.319
 Posterior tibial artery 42 (54.5) 10 (62.5) 0.560
Bilateral lesions 50 (64.9) 15 (93.8) 0.022

Values are presented as number (%) or median (interquartile range).

ABI, ankle-brachial index; PAD, peripheral artery disease.

Table 3

Comparison of the clinical characteristics of patients with ABI 0.91 to 1.40 vs. ABI ≤0.90 among the patients diagnosed with PAD by color Doppler ultrasonography (n=93)

dmj-42-63-i003.jpg
Variable ABI
0.91–1.40 ≤0.90 P value
No. of patients 77 (82.8) 16 (17.2)
Age, yr 65.2±7.0 68.6±8.0 0.084
Male sex 51 (66.2) 12 (75.0) 0.495
BMI, kg/m2 24.0±2.7 23.1±2.5 0.204
Waist circumference, cm 84.9±7.2 82.9±4.8 0.324
Systolic BP, mm Hg 144.1±21.7 149.8±17.3 0.329
Diastolic BP, mmHg 81.1±11.1 85.8±12.3 0.163
DM duration, yr 12.4±8.0 18.9±8.5 0.004
Current smoker 18 (23.4) 3 (18.8) 0.687
Use of insulin 15 (19.5) 7 (43.8) 0.038
Use of statins 12 (15.6) 5 (31.3) 0.140
Use of anti-hypertensive drugs 27 (35.1) 7 (43.8) 0.512
HbA1c, % 8.4±1.6 9.1±1.9 0.099
Fasting glucose, mg/dL 156.3±53.9 185.8±79.6 0.071
Total cholesterol, mg/dL 193.6±40.2 196.7±31.6 0.776
Triglycerides, mg/dL 137.4±55.7 129.2±42.0 0.581
HDL-C, mg/dL 48.4±14.0 45.9±13.3 0.511
LDL-C, mg/dL 117.6±33.0 125.5±30.2 0.428
Leg symptoms (typical+atypical) 37 (48.1) 12 (75.0) 0.044
Mean CIMT, mm 1.02±0.27 1.10±0.24 0.247

Values are presented as number (%) or mean±standard deviation.

ABI, ankle-brachial index; PAD, peripheral artery disease; BMI, body mass index; BP, blood pressure; DM; diabetes mellitus; HbA1c, glycosylated hemoglobin; HDL-C, high density lipoprotein cholesterol; LDL-C, low density lipoprotein cholesterol; CIMT, carotid intima-media thickness.

Table 4

Risk factors associated with the presence of PAD in 306 patients with ABI 0.91 to 1.40

dmj-42-63-i004.jpg
Variable Univariate analysis Multivariate analysisa
OR (95% CI) P value OR (95% CI) P value
Age (per 10 yr) 2.23 (1.51–3.28) <0.001 1.86 (1.18–2.93) 0.008
Male sex 1.55 (0.90–2.66) 0.113 1.07 (0.53–2.21) 0.853
BMI, kg/m2 0.92 (0.84–1.01) 0.090 0.92 (0.82–1.03) 0.158
Waist circumference, cm 1.00 (0.96–1.03) 0.877
Systolic BP (per 10 mm Hg) 1.12 (0.98–1.28) 0.096 1.02 (0.99–1.06) 0.085
Diastolic BP (per 10 mm Hg) 0.84 (0.66–1.06) 0.145
DM duration, yr 1.04 (1.01–1.07) 0.042 1.02 (0.98–1.06) 0.402
Current smoker 1.95 (1.02–3.73) 0.044 2.62 (1.10–6.21) 0.029
Use of insulin (yes) 1.30 (0.67–2.53) 0.445
Use of statins (yes) 1.10 (0.54–2.25) 0.801
Use of anti-hypertensive drugs (yes) 1.09 (0.63–1.87) 0.763
HbA1c, % 0.98 (0.85–1.14) 0.807 0.89 (0.74–1.07) 0.222
Fasting glucose, mg/dL 1.00 (0.99–1.00) 0.303
Total cholesterol, mg/dL 1.00 (0.99–1.01) 0.932 1.00 (0.99–1.01) 0.783
Triglycerides, mg/dL 1.00 (0.99–1.00) 0.193
HDL-C, mg/dL 0.99 (0.97–1.01) 0.306
LDL-C, mg/dL 1.01 (0.99–1.01) 0.200
Leg symptoms (yes) 7.55 (4.10–13.89) <0.001 7.35 (3.71–14.57) <0.001
Mean CIMT, mm 10.46 (3.12–35.03) <0.001 4.73 (1.14–19.57) 0.032

PAD, peripheral artery disease; ABI, ankle-brachial index; OR, odds ratio; CI, confidence interval; BMI, body mass index; BP, blood pressure; DM, diabetes mellitus; HbA1c, glycosylated hemoglobin; HDL-C, high density lipoprotein cholesterol; LDL-C, low density lipoprotein cholesterol; CIMT, carotid intima-media thickness.

aMultivariate model was adjusted for age, sex, BMI, systolic BP, DM duration, current smoking status, HbA1c level, total cholesterol level, leg symptoms, and mean CIMT.

Figure & Data

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      Color Doppler Ultrasonography Is a Useful Tool for Diagnosis of Peripheral Artery Disease in Type 2 Diabetes Mellitus Patients with Ankle-Brachial Index 0.91 to 1.40
      Diabetes Metab J. 2018;42(1):63-73.   Published online February 23, 2018
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    Color Doppler Ultrasonography Is a Useful Tool for Diagnosis of Peripheral Artery Disease in Type 2 Diabetes Mellitus Patients with Ankle-Brachial Index 0.91 to 1.40
    Image Image Image
    Fig. 1 Flow chart presenting the study subjects. ABI, ankle-brachial index; PAD, peripheral artery disease.
    Fig. 2 Degree of stenosis on color Doppler ultrasonography in patients with ankle-brachial index 0.91 to 1.40 (n=306). Grade III and IV stenoses were defined as peripheral artery disease and expressed with gray bars.
    Fig. 3 Receiver operating characteristic curves for carotid intima-media thickness (CIMT) for predicting peripheral artery disease (PAD) in 306 patients with ankle-brachial index 0.91 to 1.40. (A) The area under the curve for CIMT for predicting PAD in symptomatic type 2 diabetes mellitus (T2DM) patients (n=62). (B) The area under the curve (AUC) for CIMT for predicting PAD in asymptomatic T2DM patients (n=244).
    Color Doppler Ultrasonography Is a Useful Tool for Diagnosis of Peripheral Artery Disease in Type 2 Diabetes Mellitus Patients with Ankle-Brachial Index 0.91 to 1.40
    CharacteristicTotalPAD (−)PAD (+)P value
    No. of patients324231 (71.3)93 (28.7)
    Age, yr62.5±7.361.2±6.965.8±7.2<0.001
    Male sex192 (59.3)129 (55.8)63 (67.7)0.049
    BMI, kg/m224.5±2.924.7±2.923.9±2.70.018
    Waist circumference, cm84.9±7.685.1±7.984.5±6.90.562
    Systolic BP, mm Hg141.4±19.3139.9±18.4145.1±21.10.028
    Diastolic BP, mm Hg87.1±11.085.0±12.287.9±10.40.031
    DM duration, yr11.4±7.310.5±6.613.5±8.40.001
    Current smoker52 (16.0)31 (13.4)21 (22.6)0.002
    Use of insulin59 (18.2)37 (16.0)22 (23.7)0.107
    Use of statins50 (15.4)33 (14.3)17 (18.3)0.368
    Use of anti-hypertensive drugs110 (34.0)76 (32.9)34 (36.6)0.529
    HbA1c, %8.4±1.88.4±1.88.5±1.70.741
    Fasting glucose, mg/dL163.3±57.0164.1±56.1161.4±59.60.701
    Total cholesterol, mg/dL193.4±41.5193.1±42.6194.2±38.70.831
    Triglycerides, mg/dL148.5±95.1153.6±107.0135.8±53.30.131
    HDL-C, mg/dL49.6±14.550.3±14.748.0±13.80.183
    LDL-C, mg/dL113.5±35.5111.4±36.5118.9±32.50.103
    Leg symptoms (yes)
     Typical43 (13.3)6 (2.6)37 (39.8)<0.001
     Atypical31 (9.6)19 (8.2)12 (12.9)0.006
    ABI
     ≤0.90 (abnormal)18 (5.6)2 (11.1)16 (88.9)<0.001
     0.91–0.99 (borderline)15 (4.6)7 (46.7)8 (53.3)0.010
    Mean CIMT, mm0.94±0.230.90±0.191.03±0.27<0.001
    Anatomical characteristicABI
    0.91–1.40≤0.90P value
    No. of patients77 (82.8)16 (17.2)
    No. of stenoses2 (1–4)4 (2–5)0.005
    Location of stenosis
     Common iliac artery8 (10.4)3 (18.8)0.346
     Common femoral artery11 (14.3)6 (37.5)0.029
     Superficial femoral artery17 (22.1)8 (32.0)0.022
     Deep femoral artery10 (13.0)4 (25.0)0.221
     Popliteal artery11 (14.3)5 (31.3)0.102
     Anterior tibial artery53 (68.8)13 (81.3)0.319
     Posterior tibial artery42 (54.5)10 (62.5)0.560
    Bilateral lesions50 (64.9)15 (93.8)0.022
    VariableABI
    0.91–1.40≤0.90P value
    No. of patients77 (82.8)16 (17.2)
    Age, yr65.2±7.068.6±8.00.084
    Male sex51 (66.2)12 (75.0)0.495
    BMI, kg/m224.0±2.723.1±2.50.204
    Waist circumference, cm84.9±7.282.9±4.80.324
    Systolic BP, mm Hg144.1±21.7149.8±17.30.329
    Diastolic BP, mmHg81.1±11.185.8±12.30.163
    DM duration, yr12.4±8.018.9±8.50.004
    Current smoker18 (23.4)3 (18.8)0.687
    Use of insulin15 (19.5)7 (43.8)0.038
    Use of statins12 (15.6)5 (31.3)0.140
    Use of anti-hypertensive drugs27 (35.1)7 (43.8)0.512
    HbA1c, %8.4±1.69.1±1.90.099
    Fasting glucose, mg/dL156.3±53.9185.8±79.60.071
    Total cholesterol, mg/dL193.6±40.2196.7±31.60.776
    Triglycerides, mg/dL137.4±55.7129.2±42.00.581
    HDL-C, mg/dL48.4±14.045.9±13.30.511
    LDL-C, mg/dL117.6±33.0125.5±30.20.428
    Leg symptoms (typical+atypical)37 (48.1)12 (75.0)0.044
    Mean CIMT, mm1.02±0.271.10±0.240.247
    VariableUnivariate analysisMultivariate analysisa
    OR (95% CI)P valueOR (95% CI)P value
    Age (per 10 yr)2.23 (1.51–3.28)<0.0011.86 (1.18–2.93)0.008
    Male sex1.55 (0.90–2.66)0.1131.07 (0.53–2.21)0.853
    BMI, kg/m20.92 (0.84–1.01)0.0900.92 (0.82–1.03)0.158
    Waist circumference, cm1.00 (0.96–1.03)0.877
    Systolic BP (per 10 mm Hg)1.12 (0.98–1.28)0.0961.02 (0.99–1.06)0.085
    Diastolic BP (per 10 mm Hg)0.84 (0.66–1.06)0.145
    DM duration, yr1.04 (1.01–1.07)0.0421.02 (0.98–1.06)0.402
    Current smoker1.95 (1.02–3.73)0.0442.62 (1.10–6.21)0.029
    Use of insulin (yes)1.30 (0.67–2.53)0.445
    Use of statins (yes)1.10 (0.54–2.25)0.801
    Use of anti-hypertensive drugs (yes)1.09 (0.63–1.87)0.763
    HbA1c, %0.98 (0.85–1.14)0.8070.89 (0.74–1.07)0.222
    Fasting glucose, mg/dL1.00 (0.99–1.00)0.303
    Total cholesterol, mg/dL1.00 (0.99–1.01)0.9321.00 (0.99–1.01)0.783
    Triglycerides, mg/dL1.00 (0.99–1.00)0.193
    HDL-C, mg/dL0.99 (0.97–1.01)0.306
    LDL-C, mg/dL1.01 (0.99–1.01)0.200
    Leg symptoms (yes)7.55 (4.10–13.89)<0.0017.35 (3.71–14.57)<0.001
    Mean CIMT, mm10.46 (3.12–35.03)<0.0014.73 (1.14–19.57)0.032
    Table 1 Clinical characteristics of type 2 diabetes mellitus patients with and without PAD diagnosed by color Doppler ultrasonography (n=324)

    Values are presented as number (%) or mean±standard deviation.

    PAD, peripheral artery disease; BMI, body mass index; BP, blood pressure; DM, diabetes mellitus; HbA1c, glycosylated hemoglobin; HDL-C, high density lipoprotein cholesterol; LDL-C, low density lipoprotein cholesterol; ABI, ankle-brachial index; CIMT, carotid intima-media thickness.

    Table 2 Comparison of anatomical characteristics of patients with ABI 0.91 to 1.40 vs. ABI ≤0.90 among the patients diagnosed with PAD by color Doppler ultrasonography (n=93)

    Values are presented as number (%) or median (interquartile range).

    ABI, ankle-brachial index; PAD, peripheral artery disease.

    Table 3 Comparison of the clinical characteristics of patients with ABI 0.91 to 1.40 vs. ABI ≤0.90 among the patients diagnosed with PAD by color Doppler ultrasonography (n=93)

    Values are presented as number (%) or mean±standard deviation.

    ABI, ankle-brachial index; PAD, peripheral artery disease; BMI, body mass index; BP, blood pressure; DM; diabetes mellitus; HbA1c, glycosylated hemoglobin; HDL-C, high density lipoprotein cholesterol; LDL-C, low density lipoprotein cholesterol; CIMT, carotid intima-media thickness.

    Table 4 Risk factors associated with the presence of PAD in 306 patients with ABI 0.91 to 1.40

    PAD, peripheral artery disease; ABI, ankle-brachial index; OR, odds ratio; CI, confidence interval; BMI, body mass index; BP, blood pressure; DM, diabetes mellitus; HbA1c, glycosylated hemoglobin; HDL-C, high density lipoprotein cholesterol; LDL-C, low density lipoprotein cholesterol; CIMT, carotid intima-media thickness.

    aMultivariate model was adjusted for age, sex, BMI, systolic BP, DM duration, current smoking status, HbA1c level, total cholesterol level, leg symptoms, and mean CIMT.

    Hur KY, Jun JE, Choi YJ, Lee Yh, Kim DJ, Park SW, Huh BW, Lee EJ, Jee SH, Huh KB, Choi SH. Color Doppler Ultrasonography Is a Useful Tool for Diagnosis of Peripheral Artery Disease in Type 2 Diabetes Mellitus Patients with Ankle-Brachial Index 0.91 to 1.40. Diabetes Metab J. 2018;42(1):63-73.
    Received: Nov 30, 2017; Accepted: Feb 01, 2018
    DOI: https://doi.org/10.4093/dmj.2018.42.1.63.

    Diabetes Metab J : Diabetes & Metabolism Journal
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