A mitochondrial cytopathy presenting with persistent troponin elevation: case report.

Background: Mitochondrial diseases represent an important potential cause of cardiomyopathy and should be considered in patients presenting with multisystem manifestations. Timely diagnosis of a mitochondrial disorder is needed as it can have reproductive implications for the offspring of the proband. Case Summary: We describe a case of undifferentiated rising and persistent troponin elevation in a 70-year-old female with only mild heart failure symptoms and signs. An eventual diagnosis of a mitochondrial cytopathy was made after genetic testing, striated muscle, and endomyocardial biopsy. Multidisciplinary involvement was vital in securing the ultimate diagnosis and is a key lesson from this case. On follow up, with institution of heart failure therapy including cardiac resynchronisation device therapy there was improvement in exercise tolerance and symptoms. Discussion: For discussion is the investigation of undifferentiated cardiomyopathies and consideration of mitochondrial disorders as an important diagnosis to exclude prior to diagnosis as an idiopathic cardiomyopathy.

Composite Echocardiographic Score to Predict Long-Term Survival Following Myocardial Infarction.

BACKGROUND: Whilst the left ventricular ejection fraction (LVEF) remains the primary echocardiographic measure widely utilised for risk stratification following myocardial infarction (MI), it has a number of well recognised limitations. The aim of this study was to compare the prognostic utility of a composite echocardiographic score (EchoScore) composed of prognostically validated measures of left-ventricular (LV) size, geometry and function, to the utility of LVEF alone, for predicting survival following MI. METHODS: Retrospective data on 394 consecutive patients with a first-ever MI were included. Comprehensive echocardiography was performed within 24 hours of admission for all patients. EchoScore consisted of LVEF<50%, left atrial volume index>34 mL/m2, average E/e >14, E/A ratio>2, abnormal LV mass index, and abnormal LV end-systolic volume index. A single point was allocated for each measure to derive a score out of 6. The primary outcome measure was all-cause mortality. RESULTS: At a median follow-up of 24 months there were 33 deaths. On Kaplan-Meier analysis, a high EchoScore (>3) displayed significant association with all-cause mortality (log-rank χ2=74.48 p<0.001), and was a better predictor than LVEF<35% (log-rank χ2=17.01 p<0.001). On Cox proportional-hazards multivariate analysis incorporating significant clinical and echocardiographic predictors, a high EchoScore was the strongest independent predictor of all-cause mortality (HR 6.44 95%CI 2.94-14.01 p<0.001), and the addition of EchoScore resulted in greater increment in model power compared to addition of LVEF (model χ2 56.29 vs 44.71 p<0.001, Harrell's C values 0.83 vs 0.79). CONCLUSIONS: A composite echocardiographic score composed of prognostically validated measures of LV size, geometry, and function is superior to LVEF alone for predicting survival following MI.

Right Heart Catheterisation: How To Do It.

Right heart catheterisation (RHC) is a minimally invasive procedure that provides direct haemodynamic measurement of intracardiac and pulmonary pressures. It is the gold standard investigation for the diagnosis and management of pulmonary hypertension. This article will describe how to perform right heart catheterisation, indications and contraindications.

Efficacy and effectiveness of high-dose versus standard-dose influenza vaccination for older adults: a systematic review and meta-analysis.

BACKGROUND: Influenza is responsible for a significant disease burden annually, especially in older adults. This study reviews the relative vaccine efficacy or effectiveness (rVE) of high-dose inactivated trivalent influenza vaccine (HD-IIV3) compared to standard-dose influenza vaccines (SD-IIV3) in adults ≥65 against influenza-associated outcomes to inform evidence-based decision-making to shift clinical practice and standard of care in this population. METHODS: A systematic review was conducted for studies assessing the rVE of HD-IIV3 against probable/laboratory-confirmed influenza-like illness (ILI), hospital admissions, and death in adults ≥65. Results from individual seasons were meta-analyzed and a random-effects model was used to estimate pooled rVEs. RESULTS: After screening 992 studies, seven studies were meta-analyzed. HD-IIV3 demonstrated better protection against ILI compared to SD-IIV3 (rVE = 19.5%; 95% CI: 8.6-29.0%). HD-IIV3 was also more effective at preventing hospital admissions from all-causes (rVE = 9.1%; 95% CI: 2.4-15.3%), as well as from influenza (rVE = 17.8%; 95% CI: 8.1-26.5%), pneumonia (rVE = 24.3%, 95% CI: 13.9-33.4%), and cardiorespiratory events (rVE = 18.2%; 95% CI: 6.8-28.1%). rVE against post-influenza mortality was 22.2% (95% CI: -18.2-48.8%) and 2.5% (95% CI: -5.2-9.5%) against all-cause mortality. CONCLUSIONS: Available evidence suggests HD-IIV3 is more effective than SD-IIV3 at reducing the clinical outcomes associated with influenza infection in older adults and should be considered for routine use in the 65+ population.

Left Ventricular Fibrosis and Systolic Hypertension Persist in a Repaired Aortic Coarctation Model.

BACKGROUND: Despite successful repair in early life, patients with coarctation of the aorta (CoA) are predisposed to several cardiovascular complications in later life related to systemic hypertension or left ventricular (LV) dysfunction, or both, the pathogenesis of which is unclear. METHODS: Three-week-old Sprague-Dawley rats underwent transverse aortic constriction (TAC) or a sham operation, with release of the constriction 3 weeks later. Twenty-five weeks after the repair operation, animals underwent hemodynamic assessment, LV gene profiling, and histologic analysis. RESULTS: Animals with repaired aortic constriction exhibited a significantly elevated central systolic pressure (116 ± 5 mm Hg vs 103 ± 4 mm Hg; p < 0.05) despite the absence of any significant pressure gradient across the former constriction site compared with shams (5 ± 4 mm Hg vs 0 ± 2 mm Hg; p = 0.2). They also had more than a 2-fold increase in LV collagen deposition (4.86% ± 0.24% vs 2.40% ± 0.18%; p < 0.001). However, no significant differences were noted between the groups in maximum LV pressure (116 ± 3 mm Hg vs 107 ± 3 mm Hg; p = 0.1), LV mass indexed to tibial length (p = 0.07), or myocyte size. There was no significant differential expression of hypertrophy or fibrosis-related genes in the left ventricles of the repaired animals compared with shams. CONCLUSIONS: Despite successful early relief of simulated CoA in early life, relative hypertension and LV fibrosis were demonstrable late consequences in this animal model. This abnormal fibrosis persists in the absence of altered LV hemodynamics and gene expression.