BACKGROUND: Ventricular arrhythmia is an important cause of mortality in patients with ischemic left ventricular dysfunction. Revascularization with coronary artery bypass graft or percutaneous coronary intervention is often recommended for these patients before implantation of a cardiac defibrillator because it is assumed that this may reduce the incidence of fatal and potentially fatal ventricular arrhythmias, although this premise has not been evaluated in a randomized trial to date. METHODS: Patients with severe left ventricular dysfunction, extensive coronary disease, and viable myocardium were randomly assigned to receive either percutaneous coronary intervention (PCI) plus optimal medical and device therapy (OMT) or OMT alone. The composite primary outcome was all-cause death or aborted sudden death (defined as an appropriate implantable cardioverter defibrillator therapy or a resuscitated cardiac arrest) at a minimum of 24 months, analyzed as time to first event on an intention-to-treat basis. Secondary outcomes included cardiovascular death or aborted sudden death, appropriate implantable cardioverter defibrillator (ICD) therapy or sustained ventricular arrhythmia, and number of appropriate ICD therapies. RESULTS: Between August 28, 2013, and March 19, 2020, 700 patients were enrolled across 40 centers in the United Kingdom. A total of 347 patients were assigned to the PCI+OMT group and 353 to the OMT alone group. The mean age of participants was 69 years; 88% were male; 56% had hypertension; 41% had diabetes; and 53% had a clinical history of myocardial infarction. The median left ventricular ejection fraction was 28%; 53.1% had an implantable defibrillator inserted before randomization or during follow-up. All-cause death or aborted sudden death occurred in 144 patients (41.6%) in the PCI group and 142 patients (40.2%) in the OMT group (hazard ratio, 1.03 [95% CI, 0.82–1.30]; P =0.80). There was no between-group difference in the occurrence of any of the secondary outcomes. CONCLUSIONS: PCI was not associated with a reduction in all-cause mortality or aborted sudden death. In patients with ischemic cardiomyopathy, PCI is not beneficial solely for the purpose of reducing potentially fatal ventricular arrhythmias. REGISTRATION: URL: https://www.clinicaltrials.gov ; Unique identifier: NCT01920048.

Microvascular obstruction (MVO) is a recognised phenomenon following mechanical reperfusion in patients presenting with ST-segment elevation myocardial infarction (STEMI). Invasive and non-invasive modalities to detect and measure the extent of MVO vary in their accuracy, suggesting that this phenomenon may reflect a spectrum of pathophysiological changes at the level of coronary microcirculation. The importance of detecting MVO lies in the observation that its presence adds incremental risk to patients following STEMI treatment. This increased risk is associated with adverse cardiac remodelling seen on cardiac imaging, increased infarct size, and worse patient outcomes. This review provides an outline of the pathophysiology, clinical implications, and prognosis of MVO in STEMI. It describes historic and novel pharmacological and non-pharmacological therapies to address this phenomenon in conjunction with primary PCI.

Heart pumping weakness occurs progressively in all patients with Duchenne muscular dystrophy (DMD), but symptoms only occur very late in the process. Regular imaging assessments of heart function are needed to see how the heart is ‘doing’ and how well it is responding to treatment with heart drugs. Echocardiography (echo) has been the standard type of imaging used for these assessments in the UK. It is widely available but has limitations. Cardiac MRI (CMR), although less readily available and more expensive, is better able to detect tissue changes in the heart before there is any reduction of heart pump function and retains accuracy in all measures even as DMD progresses. An expert panel of cardiologists, muscle specialists and patient representatives was set up to review evidence and provide expert guidance on how to use both echo and CMR best to the benefit of patients with DMD, Becker muscular dystrophy (BMD) and females affected by DMD-gene abnormalities (‘female gene carriers’). The working group concluded that echo should remain the predominant method used in heart checks for patients with DMD in the UK. However, wider use of CMR, performed at times individualised to key decision points after about the age of 10 years, would allow earlier detection of those heart changes prompting the introduction and changes in heart therapies. Similarly, greater use of CMR could contribute to improving cardiac management of males with BMD and females with DMD-gene variations. _______________________ Objective: To provide guidance on the use of cardiac MRI (CMR) in the UK in paediatric and adult patients with Duchenne muscular dystrophy (DMD) or Becker muscular dystrophy (BMD) as well as recommendations for screening and monitoring females with dystrophin-gene variations. Specifically, to examine the ‘added value’ of CMR over echocardiography at selected time points in the assessment of individuals with or at risk of developing cardiac dystrophinopathy. Methods: Initiated by an expert working group of UK-based and US-based imaging cardiologists, neuromuscular clinicians and DMD-patient representatives, draft guidelines were created based on published evidence, current practice and expert opinion. After wider consultation with UK cardiologists, consensus was reached on the optimal use of CMR in clinical decision-making about therapy. Results and conclusions: Echocardiography should remain the predominant modality for cardiac surveillance and to guide therapy for patients with DMD in the UK. However, when tolerated, wider use of CMR at key stages in patients with DMD, older than age 10 years, and for males with BMD and females with DMD-gene variations would allow earlier detection of those with cardiac involvement and inform the earlier initiation of regimes of cardiac medications. In this way, greater use of CMR could contribute to improving cardiac health in each of these patient groups.

Background: Current guidelines acknowledge that early discharge is not associated with late mortality and that in-hospital length of stay (LOS) of 48–72 h should be considered following successful primary percutaneous coronary intervention (PPCI) in low-risk patients. Recent studies have highlighted the safety of very early discharge after PPCI in highly selected low-risk patients; however, objective tools to guide discharge timing remain limited. The Index of Microcirculatory Resistance (IMR) offers a quantitative assessment of microvascular function and may help identify patients suitable for very early discharge. We aimed to evaluate the feasibility of using IMR to guide very early discharge in patients who underwent uncomplicated PPCI. Study design and objectives: The Safety of Early Discharge Using Index Microcirculatory Resistance in Patients with Acute Myocardial Infarction (SECURE) study is designed to assess the feasibility of using IMR, measured immediately following successful PPCI, to guide early discharge from hospital within 24 h. The SECURE study is a prospective, proof-of-concept, functional non-inferiority, single-centre, randomised, open-label trial to determine if patients with low IMR can be safely discharged when compared to standard discharge policy. The SECURE study will recruit 82 patients with low IMR following successful PPCI. Participants will be 1:1 randomised to either standard discharge timing or very early discharge (within 24 h). The left ventricle ejection fraction will be assessed using cardiac magnetic resonance imaging. A telephone follow-up at 3 months will be arranged. Clinical events are collected as secondary and exploratory safety endpoints. Conclusions: The SECURE study will provide proof-of-concept data about the feasibility of using IMR to guide very early discharge following PPCI. If successful, this study will provide data to plan for a larger study to determine the safety of this personalised approach.

Background: Approximately one million individuals live with heart failure in the UK, and clinicians diagnose around 200 000 new cases each year. Although lifesaving treatments such as heart transplantation (HTx) and left ventricular assist device (LVAD) therapy exist, healthcare providers perform only about 325 of these procedures annually across the UK and Ireland. This gap suggests that many eligible patients do not receive appropriate referrals for HTx or LVAD. Aims: The Transplant Cardiology Working Group conducted the inaugural UK and Ireland National Advanced Heart Failure Audit Report 2024 to promote quality improvement in caring for patients with advanced heart failure (AHF). This first international multicentre audit specifically examined referral patterns for HTx and LVAD therapies to the seven adult heart transplant centres across the UK and Ireland. Results: The audit identified approximately 100 referrals per month for transplant or LVAD assessment. Adjusting for age eligibility, referral rates varied significantly by region, with some areas showing high referral levels and others substantially lower. The audit also found that a considerable number of referred patients had contraindications to HTx or LVAD therapy. Importantly, neither distance to the nearest transplant centre nor the deprivation level of the patient’s postcode influenced referral likelihood, indicating that factors such as clinician awareness or local referral culture may drive variation. Additionally, women remain under-referred, comprising only one in three patients assessed for AHF therapies. Conclusion: This audit provides the first concrete evidence of widespread potential inequity in access to AHF therapies across the UK and Ireland. These findings have important implications for national healthcare planning, including workforce development and allocation of public health resources. Further work is required to investigate barriers to referral, enhance clinician awareness and optimise care pathways for patients in need of both life-prolonging and supportive therapies.