Publications by authors named "Shivshankar Thanigaimani"

Article Synopsis
  • - Peripheral artery disease affects around 250 million people, and recent trials (BEST-CLI and BASIL-2) have aimed to determine whether bypass surgery or endovascular intervention is more effective for lower limb treatment.
  • - A systematic review of 13 studies with 3840 patients found no significant differences in major amputation or mortality rates between the two intervention methods, suggesting they are similarly effective in these outcomes.
  • - However, bypass surgery resulted in a significantly lower rate of re-intervention compared to endovascular treatment, indicating it may be a better long-term option for some patients.
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Article Synopsis
  • The study investigated the link between 25-hydroxy vitamin D (25(OH)D) levels and the risk and progression of abdominal aortic aneurysm (AAA).
  • Researchers recruited 4,673 participants, finding that higher 25(OH)D levels were associated with a reduced likelihood of being diagnosed with AAA, with a significant decrease in odds noted in both Queensland and Western Australia.
  • However, among participants with small AAA, those with higher vitamin D levels experienced faster AAA growth, suggesting a paradox where high vitamin D is linked to both lower diagnosis rates and quicker aneurysm expansion, warranting further investigation.
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Introduction: Minor amputation is commonly needed to treat diabetes-related foot disease (DFD). Remoteness of residence is known to limit access to healthcare and has previously been associated with poor outcomes. The primary aim of this study was to examine the associations between ethnicity and remoteness of residency with the risk of major amputation and death following initial treatment of DFD by minor amputation.

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This retrospective analysis of an ongoing prospective cohort study aimed to assess the outcome of revascularisation for treating lifestyle-limiting intermittent claudication caused by peripheral artery disease (PAD) in Aboriginal and Torres Strait Islander Peoples and non-Indigenous North Queenslanders. Consenting patients with PAD who underwent endovascular or open revascularisation procedures for treating lifestyle-limiting intermittent claudication were included. The primary outcome measure was major adverse limb events (MALEs), defined as major amputation or the requirement for repeat open or endovascular revascularisation.

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Objective: The aim of this study was to compare the efficacy of different endovascular revascularisation procedures for treating chronic limb threatening ischaemia (CLTI) using network meta-analysis (NMA).

Data Sources: The databases PubMed and Cochrane Central Register for Controlled Trials were searched on 14 March 2023.

Review Methods: A NMA of randomised controlled trials (RCTs) reporting the efficacy of different endovascular revascularisation techniques for treating CLTI was performed according to PRISMA guidelines.

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Article Synopsis
  • The systematic review and meta-analysis evaluated the effect of angiotensin II blockade (ACE inhibitors and ARBs) on the growth and events of abdominal aortic aneurysms (AAAs).
  • Eleven studies involving over 58,000 patients were analyzed, revealing that while ACE inhibitors did not significantly reduce AAA growth or repair, they were linked to a lower risk of AAA rupture and related events.
  • ARBs showed no significant associations with reducing AAA growth or risk, highlighting the need for further research in this area.
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Background: Abdominal aortic aneurysm is a weakening and expansion of the abdominal aorta. Currently, there is no drug treatment to limit abdominal aortic aneurysm growth. The glycocalyx is the outermost layer of the cell surface, mainly composed of glycosaminoglycans and proteoglycans.

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Article Synopsis
  • * Current treatments focus on surgical revascularisation, but many patients can't undergo surgery, and surgical success is variable; research is exploring new medical targets to treat ischaemia.
  • * Recent studies identify various biological pathways and novel therapies that may enhance blood flow recovery and healing in ischaemic limbs, but translating these findings into effective clinical treatments remains a challenge.
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Abdominal aortic aneurysm (AAA) causes ∼170 000 deaths annually worldwide. Most guidelines recommend asymptomatic small AAAs (30 to <50 mm in women; 30 to <55 mm in men) are monitored by imaging and large asymptomatic, symptomatic, and ruptured AAAs are considered for surgical repair. Advances in AAA repair techniques have occurred, but a remaining priority is therapies to limit AAA growth and rupture.

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Introduction: This study examined the relative efficacy of growth factor therapies in healing diabetes-related foot ulcers (DFU).

Methods: PubMed and Cochrane databases were searched for randomized controlled trials testing growth factor therapies for treating DFU. The primary outcome was complete wound closure.

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Major adverse cardiovascular events (MACE), including myocardial infarction (MI), stroke and cardiovascular death, cause substantial morbidity and mortality. This review assessed the incidence rate of MACE and the association with modifiable risk factors (diabetes, hypertension) and medication use (aspirin, statins) in patients with unrepaired abdominal aortic aneurysm (AAA). Electronic databases were searched systematically for observational studies reporting the incidence of MI, stroke or cardiovascular death in patients with unrepaired AAAs.

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Objective: The aim of this study was to systematically review the incidence and risk factors for 30 day re-admission to hospital following an index admission to treat diabetes related foot disease (DFD).

Data Sources: A literature search was conducted using Medline/PubMed, Scopus, Cochrane Library, and CINAHL databases.

Methods: The study was performed according to the Preferred Reporting Items for Systematic Reviews and Meta-Analysis (PRISMA) guidelines.

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Background: In the present study, we examined the association of immunosuppressant drug prescriptions with the growth of small abdominal aortic aneurysms (AAAs).

Methods: Participants with an AAA measuring between 30 and 50 mm were recruited from four Australian centers. AAA growth was monitored by ultrasound.

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Objective: This study aimed to examine the association between serum microRNAs (miRNAs) and diagnosis and growth of abdominal aortic aneurysm (AAA), and to test their diagnostic and prognostic value.

Methods: The expression levels of 800 miRNA tags were assessed in 108 patients with AAA, 12 age and sex matched healthy controls (HCs), and 12 patients with peripheral artery disease (PAD) using NanoString technology. Findings were assessed in an independent sample of 66 patients with AAA and 29 age and sex matched HCs by reverse transcriptase polymerase chain reaction.

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This study aimed to investigate whether home exercise programs informed by wearable activity monitors improved walking ability of patients with peripheral artery disease (PAD). A systematic literature search was performed to identify randomised controlled trials (RCT) testing home exercise that were or were not informed by wearable activity monitors. The primary outcome was the change in walking distance measured by a six-minute walking test or treadmill test over the course of the trial.

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Inflammation is strongly implicated in the pathogenesis of abdominal aortic aneurysms (AAA). This review examined the potential role of biologic disease-modifying anti-rheumatic drugs (bDMARDs) as repurposed drugs for treating AAA. Published evidence from clinical and preclinical studies was examined.

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Article Synopsis
  • The study aimed to investigate the role of the NLRP3 inflammasome in abdominal aortic aneurysm (AAA) using a mouse model and to determine if colchicine could inhibit AAA growth.
  • Researchers induced AAA in mice and assessed the activation of inflammasome markers and changes in aortic diameter compared to control mice.
  • Results showed that NLRP3 was indeed upregulated in AAA, but treatment with colchicine did not significantly affect the growth of the aneurysms over 80 days.
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Sclerostin is most recognized for its role in controlling bone formation but is also expressed in the heart, aorta, coronary, and peripheral arteries. This review summarizes research on sclerostin's role in cardiovascular disease. Rodent studies have found sclerostin to be expressed at sites of arterial calcification.

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Objective: The role of atherosclerosis in abdominal aortic aneurysm (AAA) pathogenesis is controversial. The aim of this study was to compare AAA growth in patients who did and did not have concurrent athero-occlusive disease (AOD).

Methods: Patients with an AAA measuring 35 - 49 mm in maximum diameter were recruited as part of the TElmisartan in the management of abdominal aortic aneurysm (TEDY) trial.

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Introduction: Diabetes-related wounds, particularly diabetes-related foot ulcers, are mainly caused by lack of foot sensation and high plantar tissue stress secondary to peripheral neuropathy, ischemia secondary to peripheral artery disease, and dysfunctional wound healing. Current management of diabetes-related wounds involves the offloading of high foot pressures and the treatment of ischemia through revascularization. Despite these treatments, the global burden of diabetes-related wounds is growing, and thus, novel therapies are needed.

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Background: The aim of this systematic review was to pool evidence from studies testing if pentagalloyl glucose (PGG) limited aortic expansion in animal models of abdominal aortic aneurysm (AAA).

Methods: The review was conducted according to the PRISMA guidelines and registered with PROSPERO. The primary outcome was aortic expansion assessed by direct measurement.

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Objective: This review aimed to systematically pool evidence from randomized clinical trials on the efficacy of interventions in assisting smoking cessation in participants with peripheral artery disease (PAD).

Methods: Publicly available databases were searched for randomized clinical trials testing the effect of interventional programs in achieving smoking cessation in participants with PAD who were current smokers. The primary outcome was smoking cessation at the end of follow-up.

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Objective: A meta-analysis of the association between metformin prescription and abdominal aortic aneurysm (AAA) growth and events (rupture or surgical repair) was performed.

Methods: Open source databases were searched for observational studies reporting the association between metformin prescription and AAA growth or events. Meta-analyses were performed using random effects models.

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