Publications by authors named "Dale Murdoch"

Background: Historically, differences in timely reperfusion and outcomes have been described in females who suffer ST-segment elevation myocardial infarction (STEMI). However, there have been improvements in the treatment of STEMI patients with contemporary Percutaneous Coronary Intervention (PCI) strategies.

Methods: Comparisons between sexes were performed on STEMI patients treated with primary PCI over a 4-year period (January 1, 2017-December 31, 2020) from the Queensland Cardiac Outcomes Registry.

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• Transseptal MV implantation is performed for many indications. • Previous ViV procedures do not preclude further ViV insertion. • Appropriate sizing of transseptal MVs is essential to reduce complications.

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Background: This study aimed to determine how patients trade-off the benefits and risks of two different types of procedures used to treat heart valve disease (HVD). It also aimed to determine patients' preferences for HVD treatments (predicted uptake) and the relative importance of each treatment attribute.

Methods: A discrete choice experiment (DCE) was conducted in Australia and Japan with patients who required a heart valve procedure.

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Background Prehospital activation of the cardiac catheter laboratory is associated with significant improvements in ST-segment-elevation myocardial infarction (STEMI) performance measures. However, there are equivocal data, particularly within Australia, regarding its influence on mortality. We assessed the association of prehospital activation on performance measures and mortality in patients with STEMI treated with primary percutaneous coronary intervention from the Queensland Cardiac Outcomes Registry (QCOR).

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Background/purpose: This prospective, open-label, single-arm study evaluated transcatheter aortic valve replacement (TAVR) in patients with severe aortic stenosis with ACURATE Prime XL, an iteration of the ACURATE neo2 device designed with improved radial force and adaptations for compatibility with a larger annulus diameter (≥ 26.5 mm and ≤ 29 mm based on pre-procedure diagnostic imaging).

Methods: The composite primary device success endpoint was based on Valve Academic Research Consortium (VARC)-2 criteria.

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Article Synopsis
  • Previous studies suggest that the wall motion score index (WMSI) might better predict cardiac events than left ventricular ejection fraction (LVEF) in post-myocardial infarction cases, but research specific to ST-segment elevation myocardial infarction (STEMI) is limited.
  • In a study involving 1,181 STEMI patients treated with primary percutaneous coronary intervention (PCI), WMSI was found to be a more effective predictor of 12-month mortality compared to LVEF, with significant differences in survival rates.
  • The findings indicate that while both WMSI and LVEF are strong predictors, WMSI outperforms traditional risk scores like TIMI and GRACE in forecasting outcomes for STEMI
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Objectives: We assessed sex differences in treatment and outcomes in ST-segment elevation myocardial infarction (STEMI) patients treated with primary percutaneous coronary intervention (PCI).

Background: Historically, delays to timely reperfusion and poorer outcomes have been described in women who suffer STEMI. However, whether these sex discrepancies still exist with contemporary STEMI treatment remains to be evaluated.

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Introduction: Pre-hospital activation and direct cardiac catheterisation laboratory (CCL) transfer of ST segment elevation myocardial infarction (STEMI) has previously been shown to improve door-to-balloon (DTB) times yet there is limited outcome data in the Australian context. We aimed to assess the impact of pre-hospital activation on STEMI performance measures and mortality.

Methods: Prospective cohort study of consecutive ambulance transported STEMI patients treated with primary percutaneous coronary intervention (PCI) patients over a 10-year period (1 January 2008-31 December 2017) at The Prince Charles Hospital, a large quaternary referral centre in Brisbane, Queensland Australia.

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Aims: This study sought to investigate patient and operator radiation dose in patients undergoing percutaneous coronary intervention (PCI) and the impact of body mass index (BMI) on patient and operator dose.

Methods: In patients undergoing PCI, radiation dose parameters, baseline characteristics and procedural data were collected in a tertiary centre for 3.5 years.

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Article Synopsis
  • Valve-in-valve treatment (VIV-TAVR) is a heart procedure used for patients with failing heart valves.
  • The study checked how having moderate mitral regurgitation (MR), a heart problem, affected patients getting this treatment.
  • Results showed that patients with moderate MR improved after the procedure, and it didn’t lead to more deaths or strokes over two years compared to those with mild MR.
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Objectives: To perform clinical and echocardiographic follow-up beyond 1 year in consecutive patients with severe bicuspid aortic stenosis (AS) undergoing transcatheter aortic valve replacement (TAVR) with a current generation balloon-expandable valve.

Background: Treatment of bicuspid aortic valve disease with TAVR remains controversial and late follow-up data is still scarce.

Methods: We collected baseline characteristics, procedural data, 30-day and mid-term clinical follow-up findings from six centers in Europe and Canada from patients with bicuspid AS treated with TAVR using the SAPIEN 3 valve.

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Background: Transcatheter aortic valve replacement (TAVR) for degenerated surgical bioprosthetic aortic valves is associated with favorable early outcomes. However, little is known about the durability and longer-term outcomes associated with this therapy.

Objectives: The aim of this study was to examine late outcomes after valve-in-valve TAVR.

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Objectives: To demonstrate safety, feasibility and short-term clinical outcomes after transcatheter aortic valve-in-valve (ViV) implantation under local anesthesia without contrast aortography or echocardiographic guidance.

Background: Transcatheter ViV implantation is an emerging treatment modality for patients with degenerative surgical bioprostheses. Given the radiopaque properties of the surgical aortic valve (SAV) frame, ViV procedures can often be performed with fluoroscopic guidance alone.

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The coexistence of chronic kidney disease (CKD) and severe aortic stenosis (AS) is common, and the prevalence of both is rising. The 2 conditions are inherently linked in that significant CKD may accelerate the development of AS and severe AS may result in deteriorating kidney function. The volume of and indications for transcatheter aortic valve implantation (TAVI) procedures are ever-increasing, and there are many challenges that need to be considered in patients with concomitant severe AS and CKD being assessed for TAVI.

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Background: Severe mitral regurgitation (MR) conveys significant morbidity and mortality, and surgical repair or replacement may not be a desirable option.

Objectives: The purpose of this study was to evaluate the feasibility of a percutaneous transseptal transcatheter mitral valve replacement (TMVR) system.

Methods: This first-in-human study was conducted between August 2017 and August 2018.

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Objectives: The authors sought to prospectively determine the safety and efficacy of next-day discharge using the Vancouver 3M (Multidisciplinary, Multimodality, but Minimalist) Clinical Pathway.

Background: Transfemoral transcatheter aortic valve replacement (TAVR) is an alternative to surgery in high- and intermediate-risk patients; however, hospital stays average at least 6 days in most trials. The Vancouver 3M Clinical Pathway is focused on next-day discharge, made possible by the use of objective screening criteria as well as streamlined peri- and post-procedural management guidelines.

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Objectives: The authors assessed the effect of valve-in-valve (VIV) transcatheter aortic valve replacement (TAVR) followed by bioprosthetic valve fracture (BVF), testing different transcatheter heart valve (THV) designs in an ex vivo bench study.

Background: Bioprosthetic valve fracture can be performed to improve residual transvalvular gradients following VIV TAVR.

Methods: The authors evaluated VIV TAVR and BVF with the SAPIEN 3 (S3) (Edwards Lifesciences, Irvine, California) and ACURATE neo (Boston Scientific Corporation, Natick, Massachusetts) THVs.

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Transcatheter valve-in-valve (VIV) procedures are less invasive than re-do open heart surgery, and have proven relatively safe and effective. In large multicentre registries morbidity and mortality risks are generally lower than with surgery, and improvement in quality of life can be profound. Outcomes continue to improve with advances in transcatheter heart valve (THV) technology, techniques, and expertise.

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Introduction: Diagnostic coronary angiography (CA) uses ionising radiation with relatively high doses, which impact on both patients and staff. This study sought to identify which patient and procedural factors impact patient and operator dose the most during CA.

Methods: Patient and procedure related variables impacting on Kerma area product (P ) and operator dose (OD) were collected for 16 months.

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Aims: We aimed to assess the impact of implant depth on hydrodynamic function following valve-in-valve (VIV) transcatheter aortic valve replacement (TAVR) using the ACURATE neo transcatheter heart valve (THV) through an ex vivo bench study.

Methods And Results: Multiple implantation depths were tested at incremental depths of 2 mm using a small size ACURATE neo valve for VIV TAVR in 19 mm, 21 mm, 23 mm, and 25 mm Mitroflow bioprosthetic valves. Multimodality imaging and hydrodynamic evaluation was performed at each implantation depth.

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