Peripheral arterial disease in women

Indications for a "Surgery-First" Approach for the Treatment of Lower Extremity Arterial Disease

BACKGROUND

In recent years, there has been a tendency toward an "endovascular-first" approach for the treatment for femoropopliteal arterial disease. The purpose of this study is to determine if there are patients that are better served with an initial femoropopliteal bypass (FPB) rather than an endovascular attempt at revascularization.

METHODS

A retrospective analysis of all patients undergoing FPB between June 2006 - December 2014 was performed. Our primary endpoint was primary graft patency, defined as patent using ultrasound or angiography without secondary intervention. Patients with <1-year follow-up were excluded. Univariate analysis of factors significant for 5-year patency was performed using χ2 tests for binary variables. A binary logistic regression analysis incorporating all factors identified as significant by univariate analysis was used to identify independent risk factors for 5-year patency. Event-free graft survival was evaluated using Kaplan-Meier models.

RESULTS

We identified 241 patients undergoing FPB on 272 limbs. FPB indication was disabling claudication in 95 limbs, chronic limb-threatening ischemia (CLTI) in 148, and popliteal aneurysm in 29. In total, 134 FPB were saphenous vein grafts (SVG), 126 were prosthetic grafts, 8 were arm vein grafts, and 4 were cadaveric/xenografts. There were 97 bypasses with primary patency at 5 or more years of follow-up. Grafts patent at 5 years by Kaplan-Meier analysis were more likely to have been performed for claudication or popliteal aneurysm (63% 5-year patency) as compared with CLTI (38%, P < 0.001). Statistically significant predictors (using log rank test) of patency over time were use of SVG (P = 0.015), surgical indication of claudication or popliteal aneurysm (P < 0.001), Caucasian race (P = 0.019) and no history of COPD (P = 0.026). Multivariable regression analysis confirmed these 4 factors as significant independent predictors of 5-year patency. Of note, there was no statistical correlation between FPB configuration (above or below knee anastomosis, in-situ versus reversed saphenous vein) and 5-year patency. There were 40 FPBs in Caucasian patients without a history of COPD receiving SVG for claudication or popliteal aneurysm that had a 92% estimated 5-year patency by Kaplan-Meier survival analysis.

CONCLUSIONS

Long-term primary patency that was substantial enough to consider open surgery as a first intervention was demonstrated in Caucasian patients without COPD, having good quality saphenous vein, and who underwent FPB for claudication or popliteal artery aneurysm.

A Systematic Review and Meta-Analysis on Sex-Based Disparities in Patients with Chronic Limb Threatening Ischemia Undergoing Revascularization

BACKGROUND

This systematic review and meta-analysis sought to describe the prognostic implications of sex on the clinical outcomes of patients undergoing interventions for chronic limb threatening ischemia (CLTI).

METHODS

Studies were systematically searched across 7 databases from inception to August 25, 2021 and rerun on October 11, 2022. Studies focusing on patients with CLTI undergoing open surgery, endovascular treatment (EVT), or hybrid procedures were included if sex-based differences were associated with a clinical outcome. Two independent reviewers screened studies for inclusion, extracted data, and assessed risk of bias using the Newcastle-Ottawa scale. Primary outcomes included inpatient mortality, major adverse limb events (MALE), and amputation-free survival (AFS). Meta-analyses were performed using random effects models and reported pooled odds ratio (pOR) and 95% confidence interval (CI).

RESULTS

A total of 57 studies were included in the analysis. A meta-analysis of 6 studies demonstrated that female sex was associated with statistically higher inpatient mortality compared to male sex undergoing open surgery or EVT (pOR, 1.17; 95% CI: 1.11-1.23). Female sex also demonstrated a trend toward increased limb loss in those undergoing EVT (pOR, 1.15; 95% CI: 0.91-1.45) and open surgery (pOR 1.46; 95% CI: 0.84-2.55). Female sex also had a trend toward higher MALE (pOR, 1.06; 95% CI, 0.92-1.21) in 6 studies. Finally, female sex had a trend toward worse AFS (pOR, 0.85; 95% CI, 0.70-1.03) in 8 studies.

CONCLUSIONS

Female sex was significantly associated with higher inpatient mortality and a trend toward higher MALE following revascularization. Female sex trended toward worse AFS. The reasons for these disparities are likely multifaceted on patient, provider, and systemic levels and should be explored to identify solutions for decreasing these health inequities across this vulnerable patient population.

Chronic Limb-Threatening Ischemia in Patients with Type 2 Diabetes: Revascularization Index as a Predictor for Primary Endovascular Intervention Outcome

Purpose

Chronic limb-threatening ischemia in patients with diabetes is associated with a high risk of adverse outcomes. The associated co-morbidities, the heterogeneity of foot presentation and the distribution of atherosclerotic lesions led to the emergence of multiple revascularization strategies and scoring systems to improve management outcomes. This study aimed to introduce a new index, the revascularization index (RI), and to assess its predictive value for the outcomes of primary endovascular intervention in patients with type 2 diabetes presenting with chronic limb-threatening ischemia.

Patients and Methods

A retrospective electronic medical records review was conducted for patients with type 2 diabetes presenting with chronic limb-threatening ischemia managed at King Abdullah University Hospital by primary endovascular interventions between January 2014 and August 2019. The RI was analyzed for its predictive value for the treatment outcomes.

Results

A total of 187 patients were included in this study, with a major lower limb amputation rate of 19.3%. The performance of the RI was excellent in predicting secondary revascularization (AUC = 0.80, 95% CI: 0.73-0.86, p-value < 0.001), good to predict major amputation (AUC = 0.76, 95% CI: 0.67-0.85, p-value = 0.047), and poor in predicting death (AUC = 0.46, 95% CI: 0.40-0.55, p-value = 0.398). RI of <1.21 was significantly associated with a higher risk of major lower limb amputation (HR = 5.8, 95% CI: 1.25-26.97, p-value < 0.025), and RI of < 1.3 was associated with a higher risk for secondary revascularization.

Conclusion

The RI can be used to predict major adverse lower limb events (MALE). It might be used as a guide for the extent of endovascular interventions for diabetic chronic limb-threatening ischemia with multi-level outflow atherosclerotic disease.

Females are less likely to receive best medical therapy for stroke prevention before and after carotid revascularization than males

BACKGROUND

Current professional guidelines recommend best medical therapy (BMT) with statin agents and antiplatelet therapy for primary and secondary stroke prevention in patients with carotid artery stenosis. We aimed to assess the association of patient sex with preoperative BMT in patients undergoing carotid revascularization.

METHODS

We performed a retrospective review of Vascular Quality Initiative patients who underwent carotid endarterectomy or carotid artery stenting between January 2003 and February 2022. Multivariable logistic regression models were used to assess the association of patient sex with preoperative BMT after adjusting for sociodemographic, comorbidity, and disease severity characteristics. In-hospital outcomes were assessed by sex and preoperative BMT status.

RESULTS

Of 214,008 patients who underwent carotid revascularization, 38.7% (n = 82,855) were female and 61.3% (n = 131,153) were male. Overall, 77.2% (n = 63,922) of females were on preoperative BMT, compared with 80.4% (n = 105,375) of males (P < .001). After adjusting for baseline differences, females had 11% lower odds of being on BMT compared with males (adjusted odds ratio, 0.89; 95% confidence interval, 0.86-0.91). Postoperatively, females had 18% lower odds of being prescribed BMT than males (adjusted odds ratio, 0.82; 95% confidence interval, 0.79-0.84). In-hospital stroke (1.20% vs 1.51%), death (0.37% vs 0.66%), and stroke/death (1.46% vs 1.98%) were all significantly lower for patients on BMT (all P < .001).

CONCLUSIONS

There is a significant discrepancy in the proportion of females versus males receiving preoperative BMT for stroke prevention before carotid artery revascularization. In-hospital outcomes are worse in patients without BMT, highlighting the importance of raising awareness and implementing targeted interventions to improve preoperative adherence to stroke prevention guidelines.

Inflammation and Loss of Skeletal Muscle Mass in Chronic Limb Threatening Ischemia

BACKGROUND

Lower extremity peripheral arterial disease (PAD) is an atherosclerotic disease of the lower extremities. Atherosclerosis, inflammation, and sarcopenia are independently associated and potentiate each other. Inflammation is deeply involved in the formation and progression of atherosclerosis and is also involved in the pathophysiology of sarcopenia. Sarcopenia is defined as low muscle mass, with low muscle strength. This study aims to determine the differences in skeletal muscle characteristics and in inflammatory parameters between patients with claudication and with chronic limb threatening ischemia (CLTI).

METHODS

An observational, prospective study in patients with PAD was conducted from January 2018 to December 2020. The clinical characteristics and the cardiovascular risk factors were prospectively registered. The inflammatory parameters determined were: positive acute phase proteins (C-reactive Protein- CRP- and fibrinogen) and negative acute phase proteins albumin, total cholesterol and high-density lipoprotein (HDL). The skeletal muscle area and density were quantified with a computed topography (CT) scan. The strength was determined with a Jamar® hydraulic hand dynamometer.

RESULTS

A total of 116 patients (mean age: 67.65 ± 9.53 years-old) 64% with claudication and 46% with CLTI were enrolled in the study. No differences were registered between patients with claudication and CLTI on age, cardiovascular risk factors (hypertension, dyslipidemia, diabetes mellitus, and smoking habits) and medication. There was a higher prevalence of men in the claudication group (88.89% vs. 71.70%, P = 0.019). Analyzing the inflammatory parameters, we noted that patients with CLTI had increased serum levels of positive acute phase proteins: CRP (37.53 ± 46.61 mg/L vs. 9.18 ± 26.12 mg/L, P = 0.000), and fibrinogen (466.18 ± 208.07 mg/dL vs. 317.37 ± 79.42 mg/dL, P = 0.000). CLTI patients had decreased negative acute phase proteins: albumin (3.53 ± 0.85 g/dL vs. 3.91 ± 0.72 g/dL, P = 0.001), total cholesterol (145.41 ± 38.59 mg/dL vs. 161.84 ± 34.94 mg/dL, P = 0.013) and HDL (38.70 ± 12.19 mg/dL vs. 51.31 ± 15.85 mg/dL, P = 0.000). We noted that patients with CLTI had lower skeletal muscle area and mass (14,349.77 ± 3,036.60 mm² vs. 15,690.56 ± 3,183.97 mm²P = 0.013; 10.11 ± 17.03HU vs. 18.02 ± 13.63HU P = 0.013). After adjusting for the variable sex, the association between skeletal muscle density and CLTI persisted (r (97) = -0.232, P = 0.021). The groups did not differ in strength (patients with claudication: 25.39 ± 8.23 Kgf vs. CLTI: 25.17 ± 11.95 Kgf P = 0.910).

CONCLUSIONS

CLTI patients have decreased skeletal muscle mass and a systemic inflammation status. Recognizing the deleterious triad of atherosclerosis, inflammation and loss of skeletal mass patients with CLTI is an opportunity to improve medical therapy and to perform a timely intervention to stop this vicious cycle.

The assessment of lower extremity peripheral artery disease impact on body mass center disorders

BACKGROUND

Lower extremity peripheral artery disease is a problem of contemporary medicine and along with the ischemic heart disease it is considered to be a civilization disease. The risk of the disease increases significantly within a group of people reaching the age of 55 years and is closely related to co-occurring hazardous factors, such as diabetes, hyperlipidemia, hypertension or tobacco smoking. The first symptom reported by patients is intermittent claudication. Such symptoms may indicate that lower extremity peripheral artery disease does have an impact on posture disorders and motor skills.

METHODS

The study covered four stages. The first stage involved medical interviews to obtain information regarding anthropometry, age, motor organ surgery, concomitant diseases and the lifestyle. In the following stage the value of the ankle brachial index for both lower limbs were calculated. In case of symptomatic patients, additionally, the location of artery stenosis/aortoiliac section, was verified. The third stage involved using a dynamometric platform for determination of the body mass center position for both studied groups. In the fourth stage a treadmill walk test was used to assess the participants for intermittent claudication.

FINDINGS

Based on the obtained results, an attempt was taken to observe the relationship between the clinical characteristics of the disease and the body mass center position deviations.

INTERPRETATION

The attempt was undertaken to assess whether the measurement of body mass center position might be a diagnostic parameter to evaluate the patient's condition and thus an indication for taking a decision for surgical treatment or rehabilitation.

The Incidence of Chronic Limb-Threatening Ischemia in the Midland Region of New Zealand over a 12-Year Period

The epidemiology of severe PAD, as characterized by short-distance intermittent claudication (IC) and chronic limb-threatening ischemia (CLTI), remains undefined in New Zealand (NZ). This was a retrospective observational cohort study of the Midland region in NZ, including all lower limb PAD-related surgical and percutaneous interventions between the 1st of January 2010 and the 31st of December 2021. Overall, 2541 patients were included. The mean annual incidence of short-distance IC was 15.8 per 100,000, and of CLTI was 36.2 per 100,000 population. The annual incidence of both conditions was greater in men. Women presented 3 years older with PAD (p < 0.001). Patients with short-distance IC had lower ipsilateral major limb amputation at 30 days compared to CLTI (IC 2, 0.3% vs. CLTI 298, 16.7%, p < 0.001). The 30-day mortality was greater in elderly patients (<65 years 2.7% vs. ≥65 years 4.4%, p = 0.049), but did not differ depending on sex (females 36, 3.7% vs. males 64, 4.1%, p = 0.787). Elderly age was associated with a worse survival for both short-distance IC and CLTI. There was a worse survival for females with CLTI. In conclusion, PAD imposes a significant burden in NZ, and further research is required in order to reduce this disparity.

Disparities in peripheral artery disease care: A review and call for action

Peripheral artery disease (PAD), the pathophysiologic narrowing of arterial blood vessels of the lower leg due to atherosclerosis, is a highly prevalent disease that affects more than 6 million individuals 40 years and older in the United States, with sharp increases in prevalence with age. Morbidity and mortality rates in patients with PAD range from 30% to 70% during the 5- to 15-year period after diagnosis and PAD is associated with poor health outcomes and reduced functionality and quality of life. Despite advances in medical, endovascular, and open surgical techniques, there is striking variation in care among population subgroups defined by sex, race and ethnicity, and socioeconomic status, with concomitant differences in preoperative medication optimization, amputation risk, and overall health outcomes. We reviewed studies from 1995 to 2021 to provide a comprehensive analysis of the current impact of disparities on the treatment and management of PAD and offer action items that require strategic partnership with primary care providers, researchers, patients, and their communities. With new technologies and collaborative approaches, optimal management across all population subgroups is possible.

Burden of Peripheral Artery Disease and Its Attributable Risk Factors in 204 Countries and Territories From 1990 to 2019

Background

Data on burden of peripheral artery disease (PAD) and its attributable risk factors are valuable for policymaking. We aimed to estimate the burden and risk factors for PAD from 1990 to 2019.

Methods

We extracted the data on prevalence, incidence, death, years lived with disability (YLDs), and years of life lost (YLLs) from the Global Burden of Disease Study 2019 to measure PAD burden. Moreover, the attributable burden to PAD risk factors was also estimated.

Results

Globally, in 2019, 113,443,017 people lived with PAD and 10,504,092 new cases occurred, resulting in 74,063 deaths, 500,893 YLDs, and 1,035,487 YLLs. The absolute numbers of PAD prevalent and incident cases significantly increased between 1990 and 2019, contrasting with the decline trends in age-standardized prevalence and incidence rates. However, no statistically significant changes were detected in the global age-standardized death or YLL rates. The burden of PAD and its temporal trends varied significantly by location, gender, age group, and social-demographic status. Among all potentially modifiable risk factors, age-standardized PAD deaths worldwide were primarily attributable to high fasting plasma glucose, followed by high systolic blood pressure, tobacco, kidney dysfunction, diet high in sodium, and lead exposure.

Conclusion

PAD remained a serious public health problem worldwide. More strategies aimed at implementing cost-effective interventions and addressing modifiable risk factors should be carried out, especially in regions with high or increasing burden.

Arterial stiffness predicts amputation and death in patients with chronic limb-threatening ischemia

OBJECTIVE

Arterial stiffness indices predict cardiovascular outcomes in patients with coronary or kidney disease; however, there is little data on the prognostic value of arterial stiffness in patients with advanced peripheral arterial disease. We determined whether arterial stiffness indices predict the outcomes of major amputation or death in patients with chronic limb-threatening ischemia (CLTI).

METHODS

Arterial stiffness was prospectively measured using brachial oscillometry in patients with CLTI. After measuring arterial stiffness, patients were followed in 6-month intervals for up to 3 years and evaluated for limb preservation, occurrence of major amputation, or death. Hemodynamic variables and arterial stiffness indices were used to define predictors of amputation or death.

RESULTS

A total of 136 patients presented with CLTI, and 134 (99%) of these patients required limb revascularization. At the end of follow-up (mean, 14 months), 24 patients (18%) were alive with a major amputation, and mortality was 7% (9 patients); 33 patients (24%) progressed to the combined outcome of major amputation or death. Patients having amputation and/or death (n = 33; 24%) initially presented with elevated pulse wave velocity (PWV) (13.41 ± 1.21 m/s vs 11.54 ± 1.65 m/s; P < .001), elevated augmentation index corrected to 75 beats per minute (40.42 ± 6.65% vs 27.12 ± 9.19%; P < .001), and high augmentation pressure (AP) (29.98 ± 4.32 mm Hg vs 13.40 ± 7.05 mm Hg; P < .001) compared with patients with preserved limbs. The initial ankle-brachial index (ABI) was lower in patients having amputation and/or death (0.43 ± 0.94 vs 0.62 ± 0.12; P < .001). Multivariable analysis identified PWV (odds ratio [OR], 2.62; P = .013), AP (OR, 1.56; P < .001), and ABI (OR, 0.01; P < .001) as predictors of amputation or death. ROC analysis identified patients with PWV ≤12.7 m/s (hazard ratio, 4.71; P < .001), AP ≤22.15 mm Hg (hazard ratio, 13.03; P < .001), or ABI >0.52 with an increased rate of limb preservation.

CONCLUSIONS

PWV and AP, measurements of arterial stiffness, as well as the ABI, predict amputation or death in patients with CLTI.

Lipid Optimization in Lower Extremity Peripheral Arterial Disease

AIMS

This review aims to explore the current guidance and issues surrounding lipid optimisation of patients with peripheral arterial disease (PAD).

METHODS

A narrative review of the global PAD guidance, specifically focusing on low density lipoprotein cholesterol (LDL-C) reduction methods including; 'treating to target', 'fire and forget' and LDL-C percentage reduction. Advanced literature searches were carried out in Pubmed and Google Scholar databases comparing most recent PAD lipid guidance.

RESULTS

PAD lipid guidance could be improved internationally to help clinicians implement the best lipid-reduction strategies for their patients and challenge the arbitrary 1.4 mmol/L LDL-C target in line with novel proprotein convertase subtilisin/kexin type 9 inhibitors trials. By educating primary and secondary care staff on the benefits of maximal lipid-reduction therapies, we can reduce major adverse cardiovascular events and major adverse limb events. Championing PAD community clinics may lead to earlier prevention. Research comparing lipid-reduction strategies in practice is needed to improve outcomes internationally, and ongoing practice audited to understand the extent of under-prescribing in PAD.

CONCLUSIONS

This review highlights the current PAD lipid-reduction treatments and the clarity issues of global guidance. Further research is needed to tackle ongoing mortality and morbidity rates in PAD patients against their better off cardiovascular disease (CVD) peers. MESH KEY TERMS: "Cholesterol", "Hydroxymethylglutaryl-CoA Reductase Inhibitors", "Ezetimibe", "Evolocumab", "Alirocumab", "Peripheral Arterial Disease", "Vascular Disease", "Atherosclerosis", "Secondary Prevention", "Lipoprotein, LDL".

Lower extremity arterial interventions in England

INTRODUCTION

The increasing prevalence of diabetes mellitus and advances in endovascular therapies continue to have an impact on the epidemiology and management of lower extremity arterial disease. This study describes trends in lower extremity revascularisation and major lower limb amputation in NHS England over the past two decades (2000-2019).

METHODS

Numbers of lower extremity endovascular interventions, open surgical procedures and major lower limb amputations performed in NHS England between 2000 and 2019 were extracted from publicly available hospital admitted patient care activity reports. Trends in intervention were assessed with linear regression models and chi-square tests for trend.

RESULTS

Over this period, 527,131 revascularisations and 92,053 amputations were performed. The mean age of patients was 67.5 years (standard deviation 1.6 years) and 65.3% were male. The number of lower limb revascularisation procedures increased by 402.4 units/year (95% confidence interval, CI, 290.1-514.6, p < 0.001). The number of endovascular interventions rose by 43.5% (10,912 in 2000 vs 15,657 in 2019; β = 359.5.0, 95% CI 279.3-439.8, p < 0.001) compared with no significant increase in the number of open surgical procedures (8,483 in 2000 vs 7,872 in 2019; β = 42.8, 95% CI -8.3 to 94.0, p = 0.095). The number of major lower limb amputations has decreased by 9.4% (5,418 in 2000 vs 4,907 in 2019; β = -31.0; 95% CI -49.6 to -12.5, R² = 0.42, p = 0.003).

CONCLUSIONS

There has been a significant increase in the rate of lower limb revascularisation procedures associated with decreased numbers of major lower limb amputations over the past two decades. These changes in overall trends may affect both service provision and vascular surgery training planning.

Peripheral arterial disease has a strong impact on cardiovascular outcome in patients with acute coronary syndromes: from the START Antiplatelet registry

BACKGROUND

Peripheral arterial disease (PAD) was reported to increase the risk of new cardiovascular events in patients with acute coronary syndromes (ACS). However, most of the evidence comes from randomized clinical trials. We aimed to assess the impact of PAD on cardiovascular outcome and treatment decisions in ACS patients in a current real-life setting.

METHODS

START-ANTIPLATELET is a multicenter registry enrolling ACS patient. Baseline clinical characteristics and treatment at discharge were recorded and follow-up was repeated at 6-months and 1-year. PAD was defined as intermittent claudication and/or previous revascularization.

RESULTS

Among 1442 patients enrolled, 103 (7.1%) had PAD. PAD patients were older (71.8 ± 10.6vs66.2 ± 12.6 yrs., p < 0.0001), more frequently hypertensive (90.3vs68.6%, p< 0.0001), hypercholesterolemic (66vs52%, p= 0.037), diabetic (51.5vs24%, p= 0.0001), obese (28.2vs19.3%, p= 0.029) and with previous TIA (7.8vs2.8%, p= 0.005) or stroke (11.7vs3.1%, p< 0.0001). Clinical presentation and acute treatment were similar in non-PAD and PAD patients, but the latter were discharged significantly less frequently on dual antiplatelet therapy (DAPT) (68.9vs85%, p= 0.005). After a median follow-up time of 11.1 months, major cardio/cerebrovascular event-free survival [MACCE, including cardiovascular death, MI, TIA and stroke, target-vessel revascularization (TVR) and major arterial ischemic events] was significantly shorter (9.0vs11.2 months, p= 0.02; HR 3.2, 2.4-8.4) in PAD patients and net adverse cardiovascular events (NACE = MACCE plus major hemorrhages) were significantly more frequent (19.1%vs10.5%, p = 0.049).

CONCLUSIONS

PAD identifies a subgroup of ACS patients at significantly increased cardiovascular risk, but these patients tend to be undertreated. Patients admitted for ACS should be screened for PAD and optimal medical therapy at discharge should be implemented.

Cause of Death Among Patients With Peripheral Artery Disease

Background:

Peripheral artery disease is common and associated with high mortality. There are limited data detailing causes of death among patients with peripheral artery disease.

Methods:

EUCLID (Examining Use of Ticagrelor in Peripheral Artery Disease) was a randomized clinical trial that assigned patients with peripheral artery disease to clopidogrel or ticagrelor. We describe the causes of death in EUCLID using mortality end points adjudicated through a clinical events classification process. The association between baseline factors and cardiovascular death was evaluated by Cox proportional hazards modeling. The competing risk of noncardiovascular death was assessed by the cumulative incidence function for cardiovascular death and the Fine and Gray method to ascertain the association between baseline characteristics and cardiovascular mortality.

Results:

A total of 1263 out of 13 885 (9.1%) patients died (median follow-up: 30 months). There were 706 patients (55.9%) with a cardiovascular cause of death and 522 (41.3%) with a noncardiovascular cause of death. The most common cause of cardiovascular death was sudden cardiac death (20.1%); while myocardial infarction (5.2%) and ischemic stroke (3.2%) were uncommon. The most common causes of noncardiovascular death were malignancies (17.9%) and infections (11.9%). The factor most associated with a higher risk of cardiovascular death was age per 5 year increase (HR, 1.26 [95% CI, 1.20–1.32]). Female sex was associated with a lower risk of cardiovascular death (HR, 0.68 [95% CI, 0.56–0.82]). To evaluate the effect of noncardiovascular death as a competing risk, we superimposed the cumulative incidence function curve with the Kaplan-Meier curve. These curves closely approximated each other. After accounting for the competing risk of noncardiovascular death, the magnitude and direction of the factors associated with cardiovascular death were minimally changed.

Conclusions:

Among patients with symptomatic peripheral artery disease, noncardiovascular causes of death reflected a high proportion (40%) of deaths. Accounting for noncardiovascular deaths as a competing risk, there was not a significant change in the risk estimation for cardiovascular death.

Registration:

URL: https://www.clinicaltrials.gov ; Unique identifier: NCT01732822.

Diabetes as a risk factor for incident peripheral arterial disease in women compared to men: a systematic review and meta-analysis

Aims/hypothesis

Previous meta-analyses have suggested that diabetes confers a greater excess risk of coronary heart disease, stroke, vascular dementia, and heart failure in women compared to men. While the underlying mechanism that explains such greater excess risk is unknown, in the current meta-analysis we hypothesized that we would find a similar sex difference in the relationship between diabetes and peripheral arterial disease (PAD).

Methods

PubMed MEDLINE, the Cochrane Database of Systematic Reviews, and Embase were systematically searched for prospective population-based cohort studies, with no restriction on publication date, language, or country. We included studies that reported the relative risk (RR), and its variability, for incident PAD associated with diabetes in both sexes. We excluded studies that did not adjust at least for age, and in which participants had pre-existing PAD. In cases where sex-specific results were not reported, study authors were contacted. Random-effects meta-analyses with inverse variance weighting were used to obtain summary sex-specific RRs and the women: men ratio of RRs for PAD. The Newcastle–Ottawa scale was used to assess study quality.

Results

Data from seven cohorts, totalling 2071,260 participants (49.8% women), were included. The relative risk for incident PAD associated with diabetes compared with no diabetes was 1.96 (95% CI 1.29–2.63) in women and 1.84 (95% CI 1.29–2.86) in men, after adjusting for potential confounders. The multiple-adjusted RR ratio was 1.05 (95% CI 0.90–1.22), with virtually no heterogeneity between studies (I² = 0%). All studies scored 6–8, on the Newcastle–Ottawa scale of 0–9, indicating good quality. Eleven of the 12 studies that met review inclusion criteria did not report sex-specific relative risk, and these data were collected through direct correspondence with the study authors.

Conclusion/interpretation

Consistent with other studies, we found evidence that diabetes is an independent risk factor for PAD. However, in contrast to similar studies of other types of cardiovascular disease, we did not find evidence that diabetes confers a greater excess risk in women compared to men for PAD. More research is needed to explain this sex differential between PAD and other forms of CVD, in the sequelae of diabetes. In addition, we found that very few studies reported the sex-specific relative risk for the association between diabetes and PAD, adding to existing evidence for the need for improved reporting of sex-disaggregated results in cardiovascular disease research.

Statin Prescription Rates, Adherence, and Associated Clinical Outcomes Among Women with PAD and ICVD

PURPOSE

This study sought to investigate gender-based disparities in statin prescription rates and adherence among patients with peripheral arterial disease (PAD) and ischemic cerebrovascular disease (ICVD).

METHODS

We identified patients with PAD or ICVD seeking primary care between 2013 and 2014 in the VA healthcare system. We assessed any statin use, high-intensity statin (HIS) use, and statin adherence among women with PAD or ICVD compared with men. We also compared proportion of days covered (PDC) as a measure of statin adherence; PDC ≥ 0.8 deemed a patient statin adherent. Association between statin use (or adherence) and odds of death or myocardial infarction (MI) at 12-month follow-up was also ascertained.

RESULTS

Our analyses included 192,219 males and 3188 females with PAD and 331,352 males and 10,490 females with ICVD. Women with PAD had lower prescription rates of any statin (68.5% vs. 78.7%, OR 0.68, 95% confidence interval (CI) 0.62-0.75), HIS (21.1% vs. 23.7%, OR 0.88, 95% CI 0.79-0.97), and lower statin adherence (PDC ≥ 0.8: 34.6% vs. 45.5%, OR 0.75, 95% CI 0.69-0.82) compared with men. Similar disparities were seen in ICVD patients. Among female patients with PAD or ICVD, statin adherence was associated with lower odds of MI (OR 0.76, 95% CI 0.59-0.98), while use of any statin (OR 0.71, 95% CI 0.56-0.91) and HIS (OR 0.68, 95% CI 0.48-0.97) was associated with lower odds of death at 12 months.

CONCLUSIONS

Women with PAD or ICVD had lower odds of receiving any statins, HIS, or being statin adherent. Targeted clinician- and patient-level interventions are needed to study and address these disparities among patients with PAD and ICVD.

Global, regional, and national prevalence and risk factors for peripheral artery disease in 2015: an updated systematic review and analysis

BACKGROUND

Peripheral artery disease is a major cardiovascular disease that affected 202 million people worldwide in 2010. In the past decade, new epidemiological data on peripheral artery disease have emerged, enabling us to provide updated estimates of the prevalence and risk factors for peripheral artery disease globally and regionally and, for the first time, nationally.

METHODS

For this systematic review and analysis, we did a comprehensive literature search for studies reporting on the prevalence of peripheral artery disease in the general population that were published between Jan 1, 2011, and April 30, 2019, in PubMed, MEDLINE, Embase, the Global Health database, CINAHL, the Global Health Library, the Allied and Complementary Medicine Database, and ProQuest Dissertations and Theses Global. We also included the Global Peripheral Artery Disease Study of 2013 and the China Peripheral Artery Disease Study as sources. Peripheral artery disease had to be defined as an ankle-brachial index lower than or equal to 0·90. With a purpose-built data collection form, data on study characteristics, sample characteristics, prevalence, and risk factors were abstracted from all the included studies identified from the sources. Age-specific and sex-specific prevalence of peripheral artery disease was estimated in both high-income countries (HICs) and low-income and middle-income countries (LMICs). We also did random-effects meta-analyses to pool the odds ratios of 30 risk factors for peripheral artery disease in HICs and LMICs. UN population data were used to generate the number of people affected by the disease in 2015. Finally, we derived the regional and national numbers of people with peripheral artery disease on the basis of a risk factor-based model.

FINDINGS

We included 118 articles for systematic review and analysis. The prevalence of peripheral artery disease increased consistently with age. At younger ages, prevalence was slightly higher in LMICs than HICs (4·32%, 95% CI 3·01-6·29, vs 3·54%, 1·17-10·24, at 40-44 years), but the increase with age was greater in HICs than LMICs, leading to a higher prevalence in HICs than LMICs at older ages (21·24%, 15·22-28·90, vs 12·04%, 8·67-16·60, at 80-84 years). In HICs, prevalence was slightly higher in women than in men up to age 75 years (eg, 7·81%, 3·97-14·77, vs 6·60%, 3·74-11·38, at 55-59 years), whereas in LMICs little difference was found between women and men (eg, 6·40%, 5·06-8·05, vs 6·37%, 4·74-8·49, at 55-59 years). Overall, the global prevalence of peripheral artery disease in people aged 25 years and older was 5·56%, 3·79-8·55, and the prevalence estimate was higher in HICs than that in LMICs (7·37%, 4·35-13·66, vs 5·09%, 3·64-7·24). Smoking, diabetes, hypertension, and hypercholesterolaemia were major risk factors for peripheral artery disease. Globally, a total of 236·62 million people aged 25 years and older were living with peripheral artery disease in 2015, among whom 72·91% were in LMICs. The Western Pacific Region had the most peripheral artery disease cases (74·08 million), whereas the Eastern Mediterranean Region had the least (14·67 million). More than two thirds of the global peripheral artery disease cases were concentrated in 15 individual countries in 2015.

INTERPRETATION

Peripheral artery disease continues to become an increasingly serious public health problem, especially in LMICs. With the demographic trend towards ageing and projected rise in important risk factors, a larger burden of peripheral artery disease is to be expected in the foreseeable future.

FUNDING

None.

Risk factors for reamputations in patients amputated after revascularization for critical limb-threatening ischemia

OBJECTIVE

Despite vascular intervention, patients with critical limb-threatening ischemia (CLTI) have a high risk of amputation. Furthermore, this group has a high risk for stump complications and reamputation. The primary aim of this study was to identify risk factors predicting reamputation after a major lower limb amputation in patients revascularized because of CLTI. The secondary aim was to investigate mortality after major lower limb amputation.

METHODS

There were 288 patients who underwent a major ipsilateral amputation after revascularization because of CLTI in Stockholm, Sweden, during 2007 to 2013. The main outcome was ipsilateral reamputation.

RESULTS

Of 288 patients, 50 patients had a reamputation and 222 died during the 11-year follow-up. Patients with ischemic pain as an indication for primary amputation had nearly four times higher risk for a reamputation compared with those with a nonhealing ulcer (subdistribution hazard ratio, 3.55; confidence interval, 1.55-8.17). Higher age was associated with an increased risk for death in the multivariable analysis (hazard ratio, 1.03; confidence interval, 1.02-1.04).

CONCLUSIONS

Patients with ischemic pain as an indication for amputation have an elevated risk of reamputation. Ischemic pain may be indicative of a more extensive and proximal ischemia compared with patients with foot tissue loss. An extended evaluation of the preoperative circulation before amputation may facilitate the choice of amputation level and could lead to a reduction of reamputations.

Racial and Gender Disparity in Aortoiliac Disease Open Revascularization Procedures

BACKGROUND

The impact of race and gender on surgical outcomes has been studied in infrainguinal revascularization for peripheral arterial disease. The aim of this study is to explore how race and gender affect the outcomes of suprainguinal bypass (SIB) for aortoiliac occlusive disease.

MATERIALS AND METHODS

Patients who underwent SIB were identified from the procedure-targeted National Surgical Quality Improvement Program data set (2011-2016). Patients were stratified into four groups: nonblack males, black males (BM), nonblack females, and black females (BF). Primary outcomes were 30-d major adverse cardiac events, a composite of myocardial infarction, stroke, or death; postoperative bleeding requiring transfusion or intervention; major amputation and prolonged length of stay (>10 d). Predictors of outcomes were determined by multivariable logistic regression analysis.

RESULTS

About 5044 patients were identified. BM were younger, more likely to be smokers, less likely to be on antiplatelet drug or statin, and to receive elective SIB (all P ≤ 0.01). BFs were more likely to be diabetic and functionally dependent (all P ≤ 0.02). Major adverse cardiac events were not significantly different among all groups. BM had a threefold higher risk of amputation (adjusted odds ratio [OR] [95% confidence interval (95% CI)], 3.10 [1.50-6.43]; P < 0.002). Female gender was associated with bleeding in both races, that association was more drastic in BF (OR [95% CI], 2.43 [1.63-3.60]; P < 0.0001), whereas nonblack females (OR [95% CI], 1.46 [1.19-1.80]; P < 0.0001). BF had higher odds of prolonged length of stay (OR [95% CI]: 1.62 [1.08-2.42]; P < 0.019).

CONCLUSIONS

In this large retrospective study, we demonstrated the racial and gender disparity in SIB outcomes. BM had more than threefold increase in amputation risk as compared with nonblack males. Severe bleeding risk was more than doubled in BF. Race and gender consideration is warranted in risk assessment when patients are selected for aortoiliac disease revascularization, which in turn necessitate preoperative risk modification and optimization in addition to enhancing their access to primary preventive care measures.

Body mass index and peripheral artery disease

BACKGROUND AND AIMS

An independent association of body mass index (BMI) with atherosclerotic cardiovascular disease is somewhat controversial and may differ by vascular bed. Sex-specific risk factors for atherosclerosis may further modify these associations. Obesity and peripheral artery disease (PAD) are both more prevalent in women. We sought to determine the association between PAD and BMI using a very large population-based study.

METHODS

Self-referred individuals at >20,000 US sites completed medical questionnaires including height and weight, and were evaluated by screening ankle brachial indices (ABI) for PAD (ABI<0.9).

RESULTS

Among 3,250,350 individuals, the mean age was 63.1 ± 10.5 years and 65.5% were women. The mean BMI was 27.7 ± 5.8 kg/m2. 27.8% of participants were obese (BMI ≥30 kg/m2) - 27.6% females, 28.1% males. Overweight individuals (BMI 25-29.9 kg/m2) exhibited the lowest prevalence of PAD. There was a J-shaped association of BMI with prevalent PAD. After adjustment for age and cardiovascular risk factors, underweight was associated with similarly increased odds of PAD (1.72 vs. 1.39, women and men, respectively). The association of obesity with PAD was predominant in women, with only a slight association of increasing BMI with PAD in men (OR = 2.98 vs. 1.37 for BMI ≥40 kg/m2).

CONCLUSIONS

Our study suggests that increasing BMI is a robust independent risk factor for PAD only in women. This observation requires validation, but highlights the need for further research on sex-specific risk and mechanisms of atherosclerosis.

Peripheral Vascular Disease in Women: Therapeutic Options in 2019

PURPOSE OF REVIEW

In recent years, there have been advances in the prevention, management, and control of peripheral vascular disease (PVD). There is a trend towards aggressive risk factor modification, noninvasive screening, and endovascular revascularization with surgical approaches reserved only for select cases. This article reviews the different management strategies ranging from pharmacotherapy, revascularization, and rehabilitation with an emphasis on the response of women to these therapies.

RECENT FINDINGS

Overall, the representation of women in the majority of the published data in this arena remains poor. Studies examining medical therapy and endovascular and surgical revascularization were not designed to address sex disparities. Nevertheless, we dissect these therapies and their relevant randomized trials. The paucity of data investigating the response of women to the different management options makes it difficult to make any evidence-based recommendations. This not only applies to the type of intervention, but also the appropriate timing and risks entailed.

Differences in risk factors and resource utilization for women undergoing percutaneous coronary intervention and lower extremity peripheral vascular intervention

OBJECTIVE

To investigate the differences in risk factors and in-hospital outcomes for women undergoing percutaneous coronary intervention (PCI) and peripheral vascular intervention (PVI).

BACKGROUND

The clinical impact of coronary artery disease (CAD) and peripheral artery disease (PAD) is well characterized and is associated with high morbidity and mortality. There is lack of data comparing risk factors and in-hospital outcomes for PCI and PVI, particularly in women.

METHODS

Only female hospitalizations (age ≥ 18 years) who underwent PCI or PVI from 2005 to 2014 were identified using appropriate International Classification of Diseases-Ninth Revision, Clinical Modification codes from the National Inpatient Sample database. Charlson's Comorbidity Index (CCI) was selected as the primary endpoint of the study. Coprimary endpoint was the cost of hospitalizations associated with PCI or PVI.

RESULTS

Of the 2,461,328 female hospitalizations that were included, 85.6% (N = 2,105,236) underwent PCI and 14.4% (N = 356,092) received PVI. Compared to PCI, PVI hospitalizations were 3.2 years older (p < .001) and consisted of significantly more hospitalizations above 80 years of age (26.5% vs. 18.6%; p < .001). Hospitalizations with CCI ≥3 were significantly higher in the PVI cohort (29.1% vs. 24%; p < .001). CCI in women increased during the study period for both groups. PVI hospitalizations had a significantly longer length of stay (3 days vs. 2 days; p < .001) and cost of hospitalization ($23,610 vs. $20,571; p < .001), compared to PCI. Finally, the mean cost of hospitalizations increased during the study period for PCI and PVI.

CONCLUSION

Women hospitalized for PVI had a greater risk-profile and resource utilization as demonstrated by the longer length of stay and higher cost compared to PCI.

Association between critical limb ischemia and arterial stiffness measured by brachial artery oscillometry

Background

Elevated arterial stiffness is associated with increased cardiovascular mortality. The relationship between arterial stiffness and critical limb ischemia (CLI) is not well established.

Objectives

The objective of this study is to analyze the relationship between arterial stiffness indices and the degree of limb ischemia measured by the ankle-brachial index (ABI).

Methods

A cross-sectional study comparing patients with CLI and controls. Arterial stiffness was measured using brachial artery oscillometry. The arterial stiffness indices pulse wave velocity (PWV) and augmentation index normalized to 75 beats/min (AIx@75) were determined. Multiple linear regression was applied to identify predictors of arterial stiffness indices.

Results

Patients in the CLI group had higher PWV (12.1±1.9 m/s vs. 10.1±1.9 m/s, p < 0.01) and AIx@75 (31.8±7.8% vs. 17.5±10.8%, p < 0.01) than controls. Central systolic pressure was higher in the CLI group (129.2±18.4 mmHg vs. 115.2±13.1 mmHg, p < 0.01). There was an inverse relationship between AIx@75 and ABI (Pearson coefficient = 0.24, p = 0.048), but there was no relationship between ABI and PWV (Pearson coefficient = 0.19, p = 0.12). In multiple regression analysis, reduced ABI was a predictor of elevated levels of AIx@75 (β = -25.02, p < 0.01).

Conclusions

Patients with CLI have high arterial stiffness measured by brachial artery oscillometry. The degree of limb ischemia, as measured by the ABI, is a predictor of increased AIx@75. The increased AIx@75 observed in CLI may have implications for the prognosis of this group of patients with advanced atherosclerosis.

Therapeutic effect of Cnidium officinale Makino extract on ovariectomized hind-limb ischemic mice

BACKGROUND

Cnidium officinale Makino (COM) has been used traditionally to treat female sexual disorders, such as amenorrhea, hypomenorrhea and oligomenorrhea, by improving blood circulation.

METHODS

The present study aimed to investigate the alleviating effect of COM extracts on surgical injury-induced ischemia in the hind-limb of mice. In this study, female C57BL/6 mice were ovariectomized, and the vessels of the hind-limb were excised after ligation by surgical silk (6-0). The mice were orally administered with COM (150 or 300 mg/kg/day) for 3 weeks, and the blood flow rate of hind-limbs was evaluated by using a laser Doppler system after hind-limb ischemic surgery in an in vivo study. Additionally, the migration and tube formation of human umbilical vein endothelial cells (HUVECs) were evaluated in an in vitro study.

RESULTS

The blood flow rate was synchronized to the nonischemic lesion of the hind-limb, and its elevation compared to the vehicle was observed at 14 and 21 days after hind-limb ischemic surgery in COM-treated groups. The number of capillaries increase in a dose-dependent manner in the COM-treated groups (150 and 300 mg/kg). In HUVECs, the activities of cell migration were significantly increased by 50 and 75 μg/mL for the COM-treated groups. In addition, the number of tubule branches and junctions was also increased by doses of COM (50 and/or 75 μg/mL).

CONCLUSION

The results of our study suggested that the COM extract may have therapeutic application for the treatment of hind-limb ischemic damage, which is due to the improvement of the peripheral angiogenetic system.

Readmissions to an alternate hospital in patients undergoing vascular intervention for claudication and critical limb ischemia associated with significantly higher mortality

BACKGROUND

Hospital readmissions with 30 days after vascular surgical interventions have been associated with increased morbidity, mortality, and cost. Readmission rates, now a Centers for Medicare and Medicaid Services quality measure, have been studied in databases that have excluded certain payer types and states and have not accounted for readmission to a hospital different from that of the index admission. More accurate and nationally representative data are needed, because this fragmentation of care could lead to flawed conclusions. The purpose of the present study was to examine the incidence and risk factors for readmission to a nonindex hospital for patients admitted for claudication or critical limb ischemia (CLI). We also examined how this disruption of patient care affects mortality.

METHODS

The 2013 to 2014 Nationwide Readmissions Database was queried for all patients admitted for claudication or CLI who had undergone angioplasty, lower extremity bypass, or aortobifemoral bypass. The outcomes of interest were 30- and 365-day readmission rates to any hospital, 30- and 365-day readmission rates to a nonindex hospital, and mortality rates. Multivariable logistic regression was used to identify risk factors for readmission to a nonindex hospital. The most common readmission diagnoses and diagnosis-related groups were identified.

RESULTS

A total of 92,769 patients had been admitted with peripheral vascular disease (33,055 with claudication and 59,714 with CLI). The 30- and 365-day readmission rate was 8.97% and 21.49% and 19.26% and 40.36%, for claudication and CLI, respectively. Of the 30- and 365-day readmissions, 20.47% and 24.92% had occurred at a nonindex hospital, respectively. Significantly higher mortality rates were found for patients with 30- or 365-day readmissions to different hospitals (odds ratio, 1.4 and 1.8, respectively). Multivariable analysis revealed that procedural indication and angioplasty are not significant risk factors for readmission to a different hospital. However, female sex, length of stay >7 days, and Charlson Comorbidity Index >3 remained significant risk factors for nonindex readmissions. The most common disease groups for nonindex readmission were "septicemia and disseminated infections" (6.5%), "heart failure" (6.4%), "other vascular procedures" (6.1%), and "amputation of lower limb except toes" (4.0%).

CONCLUSIONS

Previously unreported, ≥1 in 4 readmissions after lower extremity vascular procedures for peripheral vascular disease will occur at a nonindex hospital. This fragmentation of care is associated with increased mortality and has serious implications for guiding outcome and quality measures. With a sizeable portion of patients missed by current metrics, concern exists that providers are using flawed data. Further study into social- and patient-specific risk factors might provide methods to prevent these readmissions and improve outcomes in this difficult patient population.

Open repair versus endovascular treatment of complex aortoiliac lesions in low risk patients

OBJECTIVE

The aim of the present study was to compare open surgical repair (OSR) versus endovascular repair (ER) using self-expanding covered stents for complex TransAtlantic Inter-Society Consensus II (TASC) class C or D aortoiliac lesions in low-risk patients, with a specific subanalysis for younger patients.

METHODS

A single-center retrospective review of TASC C/D lesions treated from January 2008 to December 2017 was conducted. Patients with associated aortic aneurysm or lesions involving the entire infrarenal aorta were excluded. Thirty-day outcomes, long-term patency, limb salvage, and freedom from related reinterventions were compared between OSR and ER. "Low surgical risk" was defined as a Society for Vascular Surgery comorbidity score of ≤0.7 and age <75 years. Patients were considered "young" if aged ≤60 years. The follow-up results were analyzed using Kaplan-Meier curves. Major clinical and anatomic characteristics were evaluated for their association with patency using Cox proportional hazards.

RESULTS

Overall, 114 patients (OSR, n = 56; ER, n = 58) were treated, of whom, 70 patients (63%) had bilateral iliac disease involvement, for a total of 182 limbs revascularized (OSR, n = 96; ER, n = 86). Iliac lesions were classified by limb as TASC C (n = 71; 39%) or D (n = 111; 61%). Their mean age was 61.4 ± 8.4 years, and the mean Society for Vascular Surgery comorbidity score was 0.51 ± 0.39, without statistically significant differences between the OSR and ER groups (0.48 ± 0.29 vs 0.56 ± 0.47; P = .357). At 30 days, the ER group had had a shorter length of hospitalization (8.5 ± 6.2 vs 2.6 ± 0.8 days; P < .001) and intensive care unit stay (0.1 ± 0.6 vs 0.9 ± 0.5 day; P < .001) than the OSR group. The cumulative medical (OSR, 7%; ER, 5%; P = .714) and surgical (OSR, 10%; ER, 8%; P = .759) complication rates were similar. At 5 years, the primary patency rate was similar between the two groups (OSR, 87.3%; ER, 81.4%; P = .317). This result was confirmed in the subgroup of "young" patients (OSR, 84.7; ER, 75.0; P = .272). The limb salvage (OSR, 98.9%; ER, 98.4%; P = .920) and freedom from related reintervention (OSR, 74.4%; ER, 73.0%; P = .703) rates were similar. This trend was also confirmed in the "young" patients for both limb salvage (OSR, 98.5%; ER, 97.6%; P = .896) and freedom from related reintervention (OSR, 76.9%; ER, 63.6%; P = .223). Multivariate analysis indicated that the only independent negative predictor of patency was female gender in the ER group (hazard ratio, 2.89; 95% confidence interval, 1.45-26.60; P = .024).

CONCLUSIONS

In the case of severe aortoiliac obstructive lesions in low-risk and young patients, ER using a covered stent can be considered as valid as OSR. In addition, it allows for shorter hospitalization and maintains a similar patency rate in the long term. However, for female patients, OSR remains the reference standard of treatment.

Ameliorating effects of Cuscuta chinensis Lamak extract on hind‑limb ischemia, and angiogenic‑ or inflammatory associated factors in ovariectomized mice

Cuscuta chinensis Lamak (CCL) has traditionally been used in Korea to treat sexual disorders and skin problems. The aim of the present study was to investigate the effects of CCL extract on surgical injury‑induced ischemia in the hind limbs of mice. Specifically, female C57BL/6 mice were ovariectomized, and their hind‑limb vessels were ligated with surgical silk (6‑0) and excised. CCL (150 or 450 mg/kg/BW) was then administered to the mice for 3 weeks, and the blood flow rate was evaluated using a laser Doppler system at ‑7, 0, 7, 14 and 21 days following hind‑limb ischemia. The serum expression profiles of angiogenic and inflammatory mediators were measured using an antibody array, and the transcript levels were reverse transcription‑quantitative polymerase chain reaction. The rate of hind limb blood flow was normalized to non‑ischemic lesions and revealed to be markedly elevated at 14 and 21 days following ischemia when compared with the vehicle group. The density of capillaries in the hind limbs was also significantly increased following treatment with CCL in a dose‑dependent manner. In addition, the transcriptional expression of angiogenetic factors were upregulated, whereas that of inflammatory cytokines were downregulated. Finally, vascular endothelial cell migration and tube formation were evaluated in vitro using human umbilical vein endothelial cells (HUVECs) and identified to be significantly increased following treatment with CCL. Overall, the results of the present study indicate that CCL extract exhibits therapeutic potential for the treatment of hind‑limb ischemia as it promotes peripheral angiogenic and anti‑inflammatory effects in mice.

Peripheral artery disease risk factors in Jeddah, Saudi Arabia: a retrospective study

Background

Peripheral artery disease (PAD) is a major health problem in Saudi Arabia with considerable implications for morbidity and mortality. Many risk factors have been established for developing PAD, but the prevalence of these risk factors is variable from one country to another.

Aim

To identify the risk factors for PAD and study their prevalence in Jeddah, Saudi Arabia.

Methods

A retrospective chart review study was conducted in a tertiary center in Jeddah from July 2012 to September 2015. All patients with PAD were recruited into this study, and their data were analyzed using IBM SPSS. Correlation between PAD and various risk factors was studied using Spearman's coefficient.

Results

A total of 261 patients were recruited, of which 55% were males. Hypertension, diabetes type 2, and obesity were found among 34.2%, 33.3%, and 29.2% of the patients, respectively. About 45% had a history of previous vascular surgery, and amputation was performed in 6.9% particularly in legs. Hypertension and metabolic syndrome were the only risk factors that showed a significant correlation with PAD (P=0.039 and 0.040, respectively).

Conclusion

The most prevalent risk factors for PAD in Jeddah were hypertension, diabetes, obesity, and smoking. Hypertension and metabolic syndrome were the only risk factors significantly associated with PAD. Males were often more affected by PAD than females. The most commonly affected site was the lower limbs.

Association of sex and height with a lower ankle brachial index in the general population

The ankle-brachial index (ABI) is a predictor of cardiovascular events, mortality and functional status. Some studies have noted a higher prevalence of peripheral artery disease in females compared to males. Differences in height might account for these observed sex differences, but findings are conflicting. The 2003-2004 National Health and Nutrition Examination Survey (NHANES) cohort includes participants from 15 geographic locations, selected annually to represent the general population. Sample-weighted multivariable linear and logistic regression modeling was performed with ABI as the dependent variable and height and sex as primary exposure variables of interest. There were 3052 participants with ABI data (mean age 57 years, 51% female). The mean (±SE) ABI was 1.09 (±0.006) and 1.13 (±0.005) for females and males, respectively ( p < 0.0001). Shorter height was associated with a low ABI (OR 0.91 per 4 cm, 95% CI: 0.86-0.96; p=0.001). In a fully adjusted model, female sex was associated with a low ABI (OR 1.34, 95% CI: 1.04-1.72; p=0.025) independent of height and traditional cardiovascular disease (CVD) risk factors. Age, diabetes, tobacco use, known CVD, hypertension and race were associated with a low ABI (all p < 0.001). The ABI was 0.03 lower in females than in males in the general population and in a healthy cohort. Lower ABI values in healthy females do not appear to be due to occult vascular disease but rather a normal phenomenon with some contribution from height. Therefore, population sex-specific ABI thresholds should be utilized in the diagnosis of peripheral artery disease to account for these intrinsic differences.

Risk allele of gene variant rs6584389 is associated with increased intima-media thickness in patients with type 2 diabetes

BACKGROUND

Genome-wide association studies identified several gene variants associated with peripheral arterial disease (PAD). Among them, rs6584389 A>C was significantly associated with PAD defined by decreased ankle-brachial index (ABI). The aim of this study was to investigate whether the rs6584389 variant is also associated with the earlier stages of atherosclerosis assessed by intima-media thickness (IMT) or pulse-wave velocity (PWV) in clinically asymptomatic subjects with type 2 diabetes (T2DM), a group of patients with a high cardiovascular risk.

PATIENTS AND METHODS

In total, 111 patients with T2DM (56 females, 55 males) with a mean age 63.0 ± 9.1 years were consecutively included in the study. IMT was measured by ultrasound using 7 MHz linear transducer. PWV was measured using a piezoelectric method. Genotyping for rs6584389 was performed by PCR-HRMA method.

RESULTS

The carriers of the risk C-allele of rs6584389 variant had significantly higher mean left-side IMT (AA: 0.67 ± 0.12, AC 0.77 ± 0.21, CC 0.78 ± 0.22 mm; p = 0.04). In multiple linear regression analysis, rs6586389 genotype was significantly associated with all measured IMT parameters. The presence of each risk C-allele predicted an increase in left-side IMT by 0.056 mm (p = 0.017), right-side IMT by 0.053 mm (p = 0.039), average IMT by 0.054 mm (p = 0.023), and maximal IMT by 0.058 mm (p = 0.021). Age and HbA1c levels were also significantly associated with increased IMT in all multivariate models.

CONCLUSIONS

Gene variant rs6584389 A>C near to PAX2 gene was associated with increased carotid IMT in patients with type 2 diabetes independently of the other main risk factors for atherosclerosis.

Consideration of Sex Differences in Design and Reporting of Experimental Arterial Pathology Studies-Statement From ATVB Council

There are many differences in arterial diseases between men and women, including prevalence, clinical manifestations, treatments, and prognosis. The new policy of the National Institutes of Health, which requires the inclusion of sex as a biological variable for preclinical studies, aims to foster new mechanistic insights and to enhance our understanding of sex differences in human diseases. The purpose of this statement is to suggest guidelines for designing and reporting sex as a biological variable in animal models of atherosclerosis, thoracic and abdominal aortic aneurysms, and peripheral arterial disease. We briefly review sex differences of these human diseases and their animal models, followed by suggestions on experimental design and reporting of animal studies for these vascular pathologies.

Exaggerated cardiovascular responses to treadmill running in rats with peripheral arterial insufficiency

Patients with atherosclerotic peripheral artery disease have an augmented pressor response to treadmill walking, but the underlying mechanisms remain poorly understood and difficult to isolate because of the confounding presence of numerous cardiovascular risk factors. In the present study, we tested the hypothesis that a chronic deficit in muscle blood flow capacity would be sufficient to trigger an exaggerated pressor response to dynamic exercise. Sprague-Dawley rats (5 male and 5 female) were instrumented with radiotelemetry devices to measure the cardiovascular responses to treadmill running before and after bilateral femoral artery ligation, which has been previously shown to reduce the blood flow capacity of distal hindlimb muscles by >60%. Treadmill running evoked reproducible increases in mean arterial pressure (MAP) and heart rate (HR), which were significantly augmented 3 days after femoral artery ligation in both male rats [ΔMAP: +10 ± 1 (SE) vs. +18 ± 3 mmHg and ΔHR: +94 ± 12 vs. +148 ± 15 beats/min, P < 0.05] and female rats (ΔMAP: +16 ± 3 vs. +30 ± 5 mmHg and ΔHR: +128 ± 20 vs. +178 ± 19 beats/min, P < 0.05). Similar exaggerated MAP and HR responses were observed at repeated intervals between 3 and 65 days postligation. These findings indicate that a chronic deficit in muscle blood flow capacity is an important, persistent cause of the abnormal pressor and cardioaccelerator responses to dynamic exercise in both male and female rats with peripheral arterial insufficiency. NEW & NOTEWORTHY Using radiotelemetry to assess cardiovascular effects of exercise, we showed that femoral artery obstruction in male and female rats is an important, persistent cause of exaggerated pressor and cardioaccelerator responses to treadmill running. This translational model reproduces the abnormal cardiovascular response to exercise seen in patients with peripheral artery disease. Listen to this article's corresponding podcast at http://ajpheart.podbean.com/e/treadmill-bp-in-simulated-peripheral-artery-disease/ .

Cryopreserved saphenous vein as a last-ditch conduit for limb salvage

OBJECTIVE

In patients lacking autogenous vein suitable for infrainguinal bypass, cryopreserved saphenous vein (CSV) allograft (CryoLife, Inc, Kennesaw, Ga) may be an acceptable alternative. The purpose of this study was to examine outcomes of CSV conduit for infrainguinal revascularization.

METHODS

Between February 2008 and August 2015, 70 patients underwent infrainguinal bypass grafts in 73 limbs using CSV. All patients lacked suitable arm or leg vein. Demographic data and patient outcomes were retrospectively collected using electronic medical records.

RESULTS

The mean age of our cohort was 70 ± 14 years, and 36 (51%) were male; 47 (67%) were white, 39 (56%) had coronary artery disease, 27 (39%) had diabetes, 56 (80%) had hypertension, and 50 (71%) were former or current smokers. Median follow-up was 304 days (interquartile range, 130-991 days). Indications for the index operation included rest pain (27%), tissue loss (55%), and prosthetic graft infection (18%); 62 of 73 (85%) bypasses were performed for critical limb ischemia, and 45 of 73 (62%) were redo operations. Distal targets included superficial femoral artery or popliteal (38%), tibial (55%), and pedal (7%). All grafts had a minimum diameter of 3 mm. At 30 days, 55 of 64 grafts (86%) were patent; 9 were lost to early follow-up. The only significant risk factors associated with 30-day failure were ABO mismatch (43% vs 10%; P = .05) and donor blood type B or AB (40% vs 9%; P = .03). Estimated overall 1-year primary patency was 35%. In a multivariate analysis, nonblack race (P = .05), donor B or AB blood type (P = .01), and bypass to a tibial or pedal target (P = .05) were independently associated with loss of primary patency. There were 20 (27%) major amputations, and all grafts in these limbs had occluded at the time of amputation. Of the 33 limbs with ischemic tissue loss that had long-term follow-up, 17 of 33 (52%) went on to graft occlusion, 10 of 33 (30%) had a major amputation, and 24 of 33 (73%) had complete healing of the index wound.

CONCLUSIONS

In the setting of a multidisciplinary team with aggressive wound care, CSV may be a reasonable choice for infrainguinal revascularization in patients with ischemic tissue loss who lack autogenous conduit. However, poor midterm to long-term patency suggests that optimal selection of patients is needed to derive meaningful clinical benefit.

Comparison of Lower Extremity Endovascular Intervention Outcomes in Women Versus Men

This study examined a gender difference in 12-month patient outcomes after endovascular intervention for symptomatic peripheral artery disease (PAD) utilizing propensity score-matched Excellence in Peripheral Artery Disease registry data. Mortality and repeat intervention outcomes after endovascular treatment in women compared with men in the existing literature are inconsistent and confounded by other risk factors. The study included 1,084 patients who underwent 1,702 endovascular procedures, at 8 non-Veterans Administration hospitals from January 2005 to October 2015. Frailty hazard ratios by gender for time-to-event analysis were estimated. Women made up about 40% of the study population. After propensity score matching, 449 women and 449 men were included in the analysis, in which women had similar baseline patient and lesion characteristics, laboratory data, procedural characteristics, and medical therapy as men. Within 12-month postintervention, women were at a lower risk of mortality than men (p = 0.05); however, they underwent significantly more frequent repeat revascularization procedures (p = 0.04). In subgroup analysis, women with superficial femoral artery disease were also at higher risk of 12-month repeat intervention than men (p <0.01) and had a higher mortality risk, albeit with an attenuated significance (p = 0.07). Women with PAD are at a higher risk of 12-month repeat intervention than men.

Advances in our understanding of the influence of gender on patient outcomes with peripheral arterial disease co-occurring with diabetes

Peripheral arterial disease is an important predictor of cardiovascular morbidity and mortality. Patients with peripheral arterial disease are at a higher risk of myocardial infarction and stroke. The well-known coronary artery disease risk factors such as diabetes, hypertension, smoking and dyslipidemia are also risk factors for peripheral arterial disease. Hyperglycemia is an important mediator in the pathogenesis of this disease in diabetics, more so in women. The morbidity and poor outcomes associated with peripheral arterial disease in women are emerging. Women are more likely to present at an older age are often asymptomatic and have poorer outcomes with revascularization. Women experience specific sex-related challenges in the various diagnostic methods which could lead to a delay in diagnosis. This is a group which needs close attention and aggressive risk factor modification.

Do Women Have Worse Amputation-Free Survival Than Men Following Endovascular Procedures for Peripheral Arterial Disease? An Evaluation of the California State-Wide Database

Objectives:

Female gender has been shown to negatively affect the outcomes of surgical bypass for peripheral arterial disease (PAD). We examined gender-related disparities in outcomes of endovascular PAD procedures in a large population-based study.

Methods:

We used discharge data from California hospitals to identify patients who had PAD interventions during 2005 to 2009. Logistic regression was used for 12-month reintervention, and Cox proportional hazard regression was used for amputation-free survival comparisons.

Results:

A total of 25 635 patients had endovascular procedures (11 389 [44.4%] women). Women were more likely than men (34.5% vs 30.1%, P < .0001) to have critical limb ischemia (CLI). Twelve-month reintervention rate in women was similar to men. Amputation-free survival was better among women than men (hazard ratio 0.84, 95% confidence interval [CI] 0.76-0.93, P = .0006).

Conclusion:

Despite presenting more frequently with CLI, women had better amputation-free survival than men following endovascular procedures. Future research should determine whether findings favor one type of PAD treatment modality over another for women.

Challenges associated with peripheral arterial disease in women

Peripheral arterial disease (PAD) is an increasingly recognized disorder that is associated with functional impairment, quality-of-life deterioration, increased risk of cardiovascular ischemic events, and increased risk of total and cardiovascular mortality. Although earlier studies suggested that PAD was more common in men, recent reports based on more sensitive tests have shown that the prevalence of PAD in women is at least the same as in men, if not higher. PAD tends to present itself asymptomatically or with atypical symptoms more frequently in women than in men, and is associated with comorbidities or situations particularly or exclusively found in the female sex, such as osteoporosis, hypothyroidism, the use of oral contraceptives, and a history of complications during pregnancy. Fat-distribution patterns and differential vascular characteristics in women may influence the interpretation of diagnostic methods, whereas sex-related vulnerability to drugs typically used in subjects with PAD, differences in risk-factor distribution among sexes, and distinct responses to revascularization procedures in men and women must be taken into account for proper disease management. All these issues pose important challenges associated with PAD in women. Of note, this group has classically been underrepresented in research studies. As a consequence, several sex-related challenges regarding diagnosis and management issues should be acknowledged, and research gaps should be addressed in order to successfully deal with this major health issue.

Lifestyle and dietary risk factors for peripheral artery disease

Peripheral artery disease (PAD) usually refers to ischemia of the lower limb vessels. Currently, the estimated number of cases in the world is 202 million. PAD is the third leading cause of atherosclerotic cardiovascular morbidity. The measurement of the ankle-brachial index (ABI) is recommended as a first-line noninvasive test for screening and diagnosis of PAD. An ABI <0.90 is an independent predictor of cardiovascular events and this measurement is useful to identify patients at moderate to high risk of cardiovascular disease. However, there is insufficient evidence to assess the benefits and harms of screening for PAD with the ABI in asymptomatic adults. Lifestyle modifications, including smoking cessation, dietary changes and physical activity, are currently the most cost-effective interventions. Inverse associations with PAD have been reported for some subtypes of dietary fats, fiber, antioxidants (vitamins E and C), folate, vitamins B6, B12 and D, flavonoids, and fruits and vegetables. A possible inverse association between better adherence to the Mediterranean diet and the risk of symptomatic PAD has also been reported in a large randomized clinical trial. Therefore, a Mediterranean-style diet could be effective in the primary and secondary prevention of PAD, although further experimental studies are needed to better clarify this association.  (Circ J 2014; 78: 553-559).

Outcomes of endovascular lower extremity interventions depend more on indication than physician specialty

OBJECTIVE

Outcomes of endovascular lower extremity interventions (eLEIs) have been recently linked to provider specialty; however, the indication for intervention was not examined. We sought to compare outcomes between specialties performing eLEI for different indications, in a recent statewide inpatient discharge dataset.

METHODS

The Florida hospital discharge data from 2005 to 2009 were reviewed for patients with LEI during hospitalization. We assigned provider specialty as interventional radiology (IR), interventional cardiology (IC), or vascular surgery (VS) based on provider-associated procedures. Clinical indication was claudication or critical limb ischemia (CLI). We limited our analysis to patients without concomitant open surgery during hospitalization. We compared mortality, length of stay (LOS), major use of intensive care unit (ICU), discharge disposition, and total charges between specialties with regression models, both unadjusted and adjusted for demographic and clinical characteristics.

RESULTS

A total of 15,398 patients (47% with CLI) had an eLEI. Clinical indication was significantly associated with provider type (P < .001) and outcomes. VS and IR were more likely than IC to treat CLI patients (VS 59%, IR 65%, IC 26%; P < .001). IC performed the majority of procedures on claudicants (VS 30%, IC 57%, IR 13%; P < .001), while VS performed the majority of procedures on CLI patients (VS 50%, IC 23%, IR 27%; P < .001). Adjusted analyses demonstrated no difference in mortality rates between the three specialties (odds ratio [OR] VS: reference, IR: 1.24, IC: 0.79; P = NS for both). However, compared with VS, IR-treated patients were less likely to be discharged home (OR, 0.74; P < .001), LOS was longer (β, 1.16 days; P < .001), major ICU use was more common (OR, 1.49; P < .001), and total charges were higher (β, $341; P = .001). CLI predicted poorer results for all outcomes: death (OR, 4.19; P < .001), discharge home (OR, 0.50; P < .001), increased LOS (β, 3.26 days; P < .001), major ICU use (OR, 1.95; P < .001), and total charges (β, $18,730; P < .001).

CONCLUSIONS

The majority of eLEI done by VS are for CLI, whereas the majority of patients treated by IC are claudicants. Although provider specialty does correlate with several clinical results, the clinical indication for eLEI is a stronger predictor of adverse outcomes. Future analyses of eLEI should adjust for clinical indication.