Dataset Information

Critical analysis and limitations of resting ankle-brachial index in the diagnosis of symptomatic peripheral arterial disease patients and the role of diabetes mellitus and chronic kidney disease.

ABSTRACT:

Background

The ankle-brachial index (ABI) may underestimate the severity of peripheral arterial disease (PAD) in patients with noncompressible vessels. This study analyzed limitations of the ABI and toe-brachial index (TBI), if done alone, in patients with symptomatic PAD, diagnosed by duplex ultrasound (DUS) examination, particularly in patients with diabetes and chronic kidney disease (CKD).

Methods

This is a retrospective review of prospectively collected data. All patients underwent resting ABIs, TBI, and/or DUS. An ABIs of 0.90 or less in either leg was considered abnormal, and the term inconclusive ABIs (noncompressibility) was used if the ABI was 1.3 or greater. The sensitivity, specificity, positive predictive value, negative predictive value, and overall accuracy (OA) of ABIs in detecting 50% or greater stenosis of any arterial segment based on DUS were determined. A TBI of less than 0.7 was considered abnormal.

Results

We included 2226 ABIs and 1383 DUS examinations: 46% of patients had diabetes, 16% had CKD, and 39% had coronary artery disease. Fifty-three percent of the ABIs were normal, 34% were abnormal, and 13% were inconclusive. For patients with limb-threatening ischemia, 40% had normal ABIs, 40% abnormal ABIs, and 20% were inconclusive. The sensitivity and OA for ABIs in detecting 50% or greater stenosis in the whole series were 57% (95% confidence interval [CI], 53.7-61.2) and 74% (95% CI, 71.9-76.6); for diabetics 51% (95% CI, 46.1-56.3) and 66% (95% CI, 62.3-69.8); nondiabetics 66% (95% CI, 59.9-70.9) and 81% (95% CI, 78.2-83.9). For patients with CKD, the sensitivity and OA for ABIs in detecting 50% or greater stenosis was 43% (95% CI, 34.3-52.7) and 67% (95% CI, 60.2-73.0) versus patients with no CKD 60% (95% CI, 56.3-64.6) and 76% (95% CI, 73.1-78.1). If patients with inconclusive ABIs were excluded, these values were 69% (95% CI, 65.2-72.9) and 80% (95% CI, 77.2-81.9) in the whole series; 67% (95% CI, 61.6-72.7) and 75% (95% CI, 70.5-78.4) for diabetics; and 63% (95% CI, 51.3-73.0) and 78% (95% CI, 70.6-83.9) for patients with CKD. Thirty-three percent of TBIs were normal and 67% were abnormal. The sensitivity and OA for abnormal TBI in detecting 50% or greater stenosis were 85% (95% CI, 78.9-90.0) and 75% (95% CI, 70.1-80.2) in the whole series; 84% (95% CI, 76.0-90.3) and 74% (95% CI, 67.1-80.2) for diabetics; and 77% (95% CI, 61.4-88.2) and 72% (95% CI, 59.9-82.3) for patients with CKD. For those with inconclusive ABIs, these values for TBI were 75% and 69%.

Conclusions

Of symptomatic patients with PAD with 50% or greater stenosis on DUS examination, 43% had normal/inconclusive resting ABIs (49% in diabetics and 57% in CKD). TBI may help in patients with inconclusive ABIs. These patients should undergo further imaging to determine proper treatment.

SUBMITTER: AbuRahma AF

PROVIDER: S-EPMC7203622 | biostudies-literature | 2020 Mar

REPOSITORIES: biostudies-literature

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Publications

Critical analysis and limitations of resting ankle-brachial index in the diagnosis of symptomatic peripheral arterial disease patients and the role of diabetes mellitus and chronic kidney disease.

AbuRahma Ali F AF Adams Elliot E AbuRahma Joseph J Mata Luis A LA Dean L Scott LS Caron Cristyn C Sloan Jennifer J

Journal of vascular surgery 20190827 3

<h4>Background</h4>The ankle-brachial index (ABI) may underestimate the severity of peripheral arterial disease (PAD) in patients with noncompressible vessels. This study analyzed limitations of the ABI and toe-brachial index (TBI), if done alone, in patients with symptomatic PAD, diagnosed by duplex ultrasound (DUS) examination, particularly in patients with diabetes and chronic kidney disease (CKD).<h4>Methods</h4>This is a retrospective review of prospectively collected data. All patients und ...[more]

PMID: 31471230

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Project description:Atherosclerotic peripheral arterial disease (PAD) affects 8-10 million people in the United States and is associated with a marked impairment in quality of life and an increased risk of cardiovascular events. Noninvasive assessment of PAD is performed by measuring the ankle-brachial index (ABI). Complex traits, such as ABI, are influenced by a large array of genetic and environmental factors and their interactions. We attempted to characterize the genetic architecture of ABI by examining the main and interactive effects of individual single nucleotide polymorphisms (SNPs) and conventional risk factors.We applied linear regression analysis to investigate the association of 435 SNPs in 112 positional and biological candidate genes with ABI and related physiological and biochemical traits in 1046 non-Hispanic white, hypertensive participants from the Genetic Epidemiology Network of Arteriopathy (GENOA) study. The main effects of each SNP, as well as SNP-covariate and SNP-SNP interactions, were assessed to investigate how they contribute to the inter-individual variation in ABI. Multivariable linear regression models were then used to assess the joint contributions of the top SNP associations and interactions to ABI after adjustment for covariates. We reduced the chance of false positives by 1) correcting for multiple testing using the false discovery rate, 2) internal replication, and 3) four-fold cross-validation.When the results from these three procedures were combined, only two SNP main effects in NOS3, three SNP-covariate interactions (ADRB2 Gly 16 - lipoprotein(a) and SLC4A5 - diabetes interactions), and 25 SNP-SNP interactions (involving SNPs from 29 different genes) were significant, replicated, and cross-validated. Combining the top SNPs, risk factors, and their interactions into a model explained nearly 18% of variation in ABI in the sample. SNPs in six genes (ADD2, ATP6V1B1, PRKAR2B, SLC17A2, SLC22A3, and TGFB3) were also influencing triglycerides, C-reactive protein, homocysteine, and lipoprotein(a) levels.We found that candidate gene SNP main effects, SNP-covariate and SNP-SNP interactions contribute to the inter-individual variation in ABI, a marker of PAD. Our findings underscore the importance of conducting systematic investigations that consider context-dependent frameworks for developing a deeper understanding of the multidimensional genetic and environmental factors that contribute to complex diseases.

Project description:Background Lower ankle-brachial index (ABI) values within the 0.90 to 1.40 range are associated with poorer mitochondrial oxidative capacity of thigh muscles in cross-sectional analyses. Whether ABI decline is associated with greater declines in thigh muscle oxidative capacity with aging is unknown. Method and Results We analyzed data from 228 participants (100 men) of the BLSA (Baltimore Longitudinal Study of Aging), aged 39 to 97 years, with an ABI between 0.9 and 1.40 at baseline and at follow-up (mean follow-up period of 2.8 years). We examined mitochondrial oxidative capacity of the left thigh muscle, by measuring the postexercise phosphocreatine recovery rate constant (kPCr) from phosphorus-31 magnetic resonance spectroscopy. Greater kPCr indicated higher mitochondrial oxidative capacity. Although kPCr was available on the left leg only, ABI was measured in both legs. Longitudinal rates of change (Change) of left and right ABI and kPCr of the left thigh muscle were estimated using linear mixed effects models, and their association was analyzed by standardized multiple linear regressions. In multivariate analysis including sex, age, baseline kPCr, both left and right baseline ABI, and ABI change in both legs, (kPCr)Change was directly associated with ipsilateral (left) (ABI)Change (standardized [STD]-β=0.14; P=0.0168) but not with contralateral (right) (ABI)Change (P=0.22). Adjusting for traditional cardiovascular risk factors, this association remained significant (STD-β=0.18; P=0.0051). (kPCr)Change was steeper in White race participants (STD-β=0.16; P=0.0122) and body mass index (STD-β=0.13; P=0.0479). There was no significant association with current smoking status (P=0.63), fasting glucose (P=0.28), heart rate (P=0.67), mean blood pressure (P=0.78), and low-density lipoprotein (P=0.75), high-density lipoprotein (P=0.82), or triglycerides (P=0.15). Conclusions In people without peripheral arterial disease, greater decline in ABI over time, but not baseline ABI, was associated with faster decline in thigh mitochondrial oxidative capacity in the ipsilateral leg. Further studies are needed to examine whether early interventions that improve lower extremity muscle perfusion can improve and prevent the decline of muscle energetics.

Project description:Pseudoxanthoma elasticum (PXE) is an inherited metabolic disease characterized by elastic fiber fragmentation and calcification in the cutaneous, ophthalmologic, and vascular tissues. Cardiovascular manifestations such as peripheral arterial disease (PAD) are frequent in PXE. Because of the changes in the elastic properties and medial calcification of the arterial wall in PXE, the impact of the arterial remodeling on the ankle brachial index (ABI), a well-established diagnostic method for the detection and follow-up of PAD, remains to be determined in this disease.This was a cross-sectional, comparative, open study, which took place at the PXE Consultation Center, University Hospital of Angers. The subjects were 53 patients (mean age, 49 ± 14 years; 35 females) with PXE clinically proven on the basis of established criteria (skin changes, angioid streaks, and skin biopsy). The ABI at rest, symptoms of intermittent claudication (IC), carotid intima-media thickness (IMT), carotid-femoral pulse wave velocity (c-f PWV), compliance (CC), and ? stiffness index were measured in a single-center cohort.Forty-five percent of the PXE patients had an ABI ?0.90, but only one patient had an ABI >1.40. IC was found in 23% of the patients with an ABI ?0.90. There were no significant differences between the patients with a low and normal ABI in terms of IMT (P = .566) or ? stiffness index (P = .194), but differences were significant for c-f PWV (P = .010) and CC (P = .011). Adjusted multivariate linear regression for the Framingham-Laurier score showed that patients with a low ABI had less compliant carotid arteries (B = 0.318, P = .039).PAD detected by a low ABI is very frequent in PXE, although with limited prevalence of symptomatic claudication. Unexpectedly, ABI was low in such calcifying PAD and associated with lower CC, independently of atherosclerosis risk factors. These findings demonstrate that PXE represents a unique monogenic model of PAD in which the specific arterial wall remodeling could change the diagnostic value of the ABI to detect PAD.

Dataset Information

Critical analysis and limitations of resting ankle-brachial index in the diagnosis of symptomatic peripheral arterial disease patients and the role of diabetes mellitus and chronic kidney disease.

Background

Methods

Results

Conclusions

Publications

Critical analysis and limitations of resting ankle-brachial index in the diagnosis of symptomatic peripheral arterial disease patients and the role of diabetes mellitus and chronic kidney disease.

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