Publications by authors named "Justin Nowell"

Neuronal intranuclear inclusion disease (NIID), a neurodegenerative disease previously thought to be rare, is increasingly recognized despite heterogeneous clinical presentations. NIID is pathologically characterized by ubiquitin and p-62 positive intranuclear eosinophilic inclusions that affect multiple organ systems, including the brain, skin, and other tissues. Although the diagnosis of NIID is challenging due to phenotypic heterogeneity, a greater understanding of the clinical and imaging presentations can improve accurate and early diagnosis.

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Objective: To determine the minimum duration of electroencephalography (EEG) data necessary to differentiate EEG features of Lewy body dementia (LBD), that is, dementia with Lewy bodies and Parkinson disease dementia, from non-LBD patients, that is, Alzheimer disease and Parkinson disease.

Methods: We performed quantitative EEG analysis for 16 LBD and 14 non-LBD patients. After artifact removal, a fast Fourier transform was performed on 90, 60, and thirty 2-second epochs to derive dominant frequency; dominant frequency variability; and dominant frequency prevalence.

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Aims: Modern imaging techniques provide evermore-detailed anatomical and physiological information for use in computational fluid dynamics to predict the behaviour of physiological phenomena. Computer modelling can help plan suitable interventions. Our group used magnetic resonance imaging and computational fluid dynamics to study the haemodynamic variables in the ascending aorta in patients with bicuspid aortic valve before and after isolated tissue aortic valve replacement.

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Background: Aortic dissection is a life-threatening complication of bicuspid aortic valve (BAV)-associated aortopathy. In these populations, whilst prophylactic replacement of proximal thoracic aortic aneurysms (TAAs) is generally recommended at threshold diameters ≥5.5 cm, dissection may occur in smaller aortas.

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There have been several investigations comparing the efficacy of percutaneous coronary intervention and coronary artery bypass grafting surgery for treatment of left main stem disease. This includes the Evaluation of XIENCE versus Coronary Artery Bypass Graft Surgery for Effectiveness of Left Main Revascularizaton (EXCEL) trial, which has garnered significant controversy surrounding its experimental design and reporting of its results. The authors review the methodology, results, caveats and statements on the EXCEL trial.

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Objectives: Fractional flow reserve (FFR) measures the drop in perfusion pressure across a stenosis, therefore representing its physiological effect on myocardial blood flow. Its use is widespread in percutaneous coronary interventions, though its role in coronary artery bypass graft (CABG) surgery remains uncertain. This systematic review and meta-analysis aims to evaluate current evidence on outcomes following FFR-guided CABG compared to angiography-guided CABG.

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Article Synopsis
  • The study examines both genetic and haemodynamic theories related to bicuspid aortic valve aortopathy, using advanced imaging and fluid dynamics to better understand blood flow patterns.
  • Key findings indicate that the bicuspid aortic valve leads to abnormal blood flow characteristics such as eccentric flow and increased wall shear stress (WSS), which are linked to aortic dilation and wall thinning.
  • The research suggests that new haemodynamic factors, particularly WSS, should be considered alongside aorta diameter to assess the progression of the disease and make decisions about treatment timing and type.
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Article Synopsis
  • - Recent guidelines advocate for more aggressive surgery in patients with bicuspid aortic valves suffering from aneurysms of the ascending aorta and root, but the impact on the aortic arch post-surgery is unclear.
  • - A study involving 536 patients showed that 168 had bicuspid aortic valves; aortic arch sizes were monitored before and after surgeries for growth over time, with a high rate of successful outcomes.
  • - Results indicated that prophylactic surgery on the aortic arch is unnecessary, as significant changes in arch size were not observed, suggesting long-term monitoring of the aorta in these patients may not be needed.
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Objectives: Significant proportions of aortic dissections occur at aortic diameters <5.5 cm. By indexing aortic area to height and correlating with absolute aortic diameter, we sought to identify those aneurysm patients with aortic diameters <5.

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Objective: Complications of cardiopulmonary bypass (CPB) are rare, but life-threatening events that need prompt and rehearsed actions involving a team. This is not adequately taught to cardiothoracic surgical trainees. The objective of this study was to assess the knowledge of cardiothoracic trainees required to manage these events after simulation-based vs.

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Background: In recent years, cardiothoracic (CT) surgical training has faced several challenges, including a reduction in working hours and trainees favoring shorter training programs. We carried out a national survey in the United Kingdom (UK) to assess the CT 6-year training program.

Methods: All CT trainees in the UK (n = 121) were sent an online survey.

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Optimal thromboprophylaxis following bioprosthetic aortic valve replacement (AVR) remains controversial. The main objective, which is the effective prevention of central nervous or peripheral embolic events, especially in the early postoperative period, will have to be weighed against the haemorrhagic risk that is associated with the utilization of different antithrombotic regimes. Most governing bodies in cardiovascular medicine have issued recommendations on thromboprophylaxis after the surgical implantation of aortic bioprostheses.

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A 60-year old woman presented with dyspnoea and fatigue. She was frail and cachectic (BMI 17.5) with a pancytopenia.

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The present article reports a case involving a 29-year-old man who developed severe cardiac failure (New York Heart Association class IV). He had a complex surgical history, beginning with the repair of an anterior sinus of Valsalva aneurysm and closure of a ventricular septal defect at eight months of age. His residual Valsalva aneurysm and mixed aortic valve disease necessitated mechanical aortic valve replacement at 14 years of age.

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Atrial fibrillation (AF) is associated with substantial morbidity, mortality, and economic burden and confers a lifetime risk of up to 25%. Current medical management involves thromboembolism prevention, rate, and rhythm control. An increased understanding of AF pathophysiology has led to enhanced pharmacological and medical therapies; however this is often limited by toxicity, variable symptom control, and inability to modulate the atrial substrate.

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Purpose: Cardiac pheochromocytoma with multiple endocrine neoplasia syndrome (MENS) is rare. We present a rare case of concurrent cardiac pheochromocytoma and pituitary adenoma, a rare variant of the MEN syndromes and a review of the literature with special emphasis on diagnosis and treatment.

Methods: Different from the single MENS type I or type II, Variant MENS' symptoms and signs are so nontypical that it is easy to make a misdiagnosis or missed diagnosis.

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We describe a bailout procedure when surgical aortic-valve replacement was not possible due to severe calcification of the ascending aorta and the root and a very small annulus. A 21-mm CoreValve Revalving prosthesis was inserted via the aortotomy in the presence of a mitral prosthesis.

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Objective: Inflammation has been implicated in the pathogenesis of postoperative atrial fibrillation (AF). Adipose tissue secretes both pro-inflammatory cytokines such as interleukin-6 (IL-6) and anti-inflammatory mediators such as adiponectin. We set out to examine the association of adiponectin and IL-6, both circulating and locally produced by the epicardial adipose tissue, with AF development after cardiac surgery.

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The life expectancy of the general population is increasing. This has meant that more elderly patients are requiring aortic valve replacement (AVR). The choice of valve replacement and its durability are important.

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