Publications by authors named "Horrigan M"

Background: Complex Revascularisation in High-Risk Indicated Patients (CHIP) is emerging in Percutaneous Coronary Intervention (PCI). We document the frequency and outcomes following CHIP PCI in the Australian population, to understand risk and guide clinical decision-making. We propose a scoring system to define CHIP procedures.

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Article Synopsis
  • The study investigates how daily mean temperature and common pollutants relate to atrial fibrillation (AF) cases in emergency departments from 2014 to 2020.
  • It analyzed data from over 82,000 AF presentations and found that elevated levels of Particulate Matter (PM 2.5) and nitrous dioxide (NO2) significantly increased AF cases, while temperature and other pollutants did not have a notable effect.
  • The findings suggest that higher PM 2.5 and NO2 levels contribute to increased AF risk, highlighting the need for better environmental policies and patient guidance in areas with elevated pollution levels.
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Background: Guidelines and international appropriate use criteria increasingly endorse non-invasive stress testing to evaluate patients with suspected chronic coronary disease (CCD). We sought to review the real-world utilisation of non-invasive stress testing and investigate whether their use prior to PCI associates with outcomes in patients with CCD.

Methods: Consecutive patients from a multicentre registry who underwent PCI for CCD between 2006 and 2018 were included.

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Background: Atrial fibrillation (AF) is a growing burden on healthcare resources, despite improvements in prevention and management. AF is a common cause of hospitalisation, and Emergency Medical Services (EMS) use. However, there is a paucity of data describing the burden of AF on EMS.

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Purpose Of Review: Coronary angiography-associated acute ischaemic stroke (CAAIS) is an uncommon event but is associated with significant mortality and morbidity. The incidence of CAAIS has increased with a rise in the volume of coronary angiography (CA) and percutaneous coronary intervention (PCI) performed. Intravenous thrombolysis (IVT) is utilized in the general management of acute ischaemic stroke; however, it is associated with a higher risk of intracranial hemorrhage (ICH).

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Background: Current evidence suggests that percutaneous coronary intervention for unprotected left main coronary artery disease (LMPCI) in selected patients is a safe alternative to coronary artery bypass grafting. However, real-world long-term survival data is limited.

Methods: We analyzed 24,644 patients from the MIG (Melbourne Interventional Group) registry between 2005 and 2020.

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Background: Percutaneous coronary intervention (PCI) in stable ischaemic heart disease (SIHD) has not been shown to improve prognosis but can alleviate symptoms and improve quality of life. Appropriately selected patients with symptoms refractory to medical therapy therefore stand to benefit, provided safety is proven.

Methods: Consecutive patients undergoing PCI for SIHD between 2005-2018 in a prospective registry were included.

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Aim    The primary aim was to ascertain long-term rates of atrial fibrillation (AF) recurrence in this all-comer patient population undergoing elective electrical cardioversion (DCR). Secondary aims included procedural DCR success, clinical predictors of long-term maintenance of sinus rhythm (SR) and AF related hospitalizations.Material and Methods    A retrospective cohort study was conducted.

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Importance: Prehospital point-of-care troponin testing and paramedic risk stratification might improve the efficiency of chest pain care pathways compared with existing processes with equivalent health outcomes, but the association with health care costs is unclear.

Objective: To analyze whether prehospital point-of-care troponin testing and paramedic risk stratification could result in cost savings compared with existing chest pain care pathways.

Design, Setting, And Participants: In this economic evaluation of adults with acute chest pain without ST-segment elevation, cost-minimization analysis was used to assess linked ambulance, emergency, and hospital attendance in the state of Victoria, Australia, between January 1, 2015, and June 30, 2019.

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Background: Pulmonary arterial hypertension (PAH) has a progressive, unremitting clinical course. Vasoreactivity testing (VdT) during right heart catheterisation (RHC) identifies a subgroup with excellent long-term response to calcium channel blockade (CCB). Reporting on these patients is limited.

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Background And Purpose: Research into the temporal relationship between atrial tachyarrhythmias (atrial tachycardia [AT] and atrial fibrillation [AF]) and stroke has produced conflicting findings. Systematic categorization of stroke subtypes may help clarify the discussion.

Objectives: The objective of the study was to examine the presence and timing of AT/AF in relation to ischemic stroke subtypes, categorized as either cardioembolic (CE) or non-CE.

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Background: Pulmonary hypertension (PH) is an important complication of interstitial lung disease (ILD), as its development confers a poor prognosis. There are no specific recommendations for methods of assessment for PH in ILD populations.

Aims: To determine current assessment practices for PH in an Australian ILD centre.

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Background: Primary percutaneous coronary intervention (PCI) for patients with ST-elevation myocardial infarction (STEMI) is recommended within 90 min of first medical contact. Those without pre-hospital notification (PN) are less likely to meet reperfusion targets and are an understudied subset of the STEMI population.

Methods: An observational cohort study from a multicentre PCI registry of consecutive patients undergoing primary PCI for STEMI between 2012 and 2017.

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A panel discusses ongoing and prospective developments in the US labor market. Michael Horrigan points out that job losses in the COVID recession were heavily concentrated among women, minorities, and less-educated workers. In turn, these groups have shown less progress regaining jobs, and many have left the labor force.

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Aims: We report the 2-year outcomes of the MitrAl ValvE RepaIr Clinical (MAVERIC) trial. Functional mitral regurgitation (FMR) is associated with poor outcomes for which there remains an unmet clinical need. ARTO is a transcatheter annular reduction device for the treatment of FMR and an emerging alternative for patients at high surgical risk.

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Article Synopsis
  • The study aimed to evaluate if providing surgical report cards (SuReps) to surgeons enhanced patient outcomes after prostate cancer surgery, focusing on oncologic, urinary, and sexual functions.
  • Conducted at The Ottawa Hospital, the research involved 422 patients undergoing radical prostatectomy, comparing pre and post intervention outcomes related to erectile function, urinary continence, and surgical margins.
  • While nerve-sparing surgery rates increased with report card feedback, functional outcomes remained unchanged, indicating that surgical report cards alone didn't improve patient results; further adjustments and longer feedback periods may be warranted for better outcomes.
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Background: Increasingly, fractional flow reserve (FFR) is employed to assess coronary artery stenoses although there is limited real world long-term outcome data with a recent report questioning its safety. This study aimed to assess the in-hospital complications and clinical outcomes up to 10 years after FFR-guided revascularisation at a tertiary Australian hospital.

Methods: The cohort comprised 274 consecutive patients undergoing FFR from 2010 to 2015 with follow-up to 2020.

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Coronary artery disease (CAD) confers increased perioperative risk in patients undergoing liver transplantation (LT). Although routine screening for CAD is recommended, there are limited data on the effectiveness of screening strategies. We evaluated the safety and efficacy of a 3-tiered cardiac risk-assessment protocol that stratifies patients based on age and traditional cardiac risk factors.

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Background And Purpose: Postoperative atrial fibrillation (POAF) is the commonest cardiovascular complication following liver transplantation (LT). This study sought to assess a possible association of POAF with subsequent thromboembolic events in patients undergoing LT.

Methods: A retrospective cohort study of consecutive adults undergoing LT between 2010 and 2018 was undertaken.

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Aims: The aim of this study was to assess the one-year safety and efficacy of the transcatheter ARTO system in the treatment of functional mitral regurgitation (FMR).

Methods And Results: MAVERIC is a multicentre, prospective, non-randomised pre-commercial study. Eligible patients were on guideline-recommended therapy for NYHA Class II-IV systolic heart failure and had an FMR grade ≥2+.

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Background: A history of cancer is incorporated into the surgical risk assessment of patients undergoing surgical aortic valve replacement through the Society for Thoracic Surgeons score. However, the prognostic significance of cancer in patients treated with transcatheter aortic valve replacement (TAVR) is unclear. As the cancer survivorship population increases, it is imperative to establish the efficacy and safety of TAVR in patients with severe symptomatic aortic stenosis (AS) and a history of malignancy.

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Background: Combination drug therapy for pulmonary arterial hypertension (PAH) is the international standard of care for most patients, however in Australia there are barriers to drug access. This study evaluates current treatment of PAH patients in Australia and the consistency of therapy with international guidelines.

Methods: Cross-sectional analysis of patients with Group 1 PAH enrolled in the Pulmonary Hypertension Society of Australia and New Zealand Registry (PHSANZ) at 31 December 2017.

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Background: Transcatheter aortic valve replacement (TAVR) has revolutionised the treatment of severe aortic stenosis (AS), though its safety and efficacy in low-risk patients remains to be established.

Methods: A systematic review of PubMed, Medline and EMBASE identified four randomised controlled trials (RCTs) in patients at low surgical risk comparing TAVR to surgical aortic valve replacement (SAVR). A meta-analysis was performed with a primary outcome of a composite of all-cause mortality and stroke at longest available follow-up.

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