A. Davies

Acquired Gerbode Defects Associated with Infective Endocarditis.

Infective endocarditis is associated with a high risk of mortality and complications. A very rare complication is the development of an acquired left ventricle to right atrium (Gerbode) defect secondary to bacterial invasion of the membranous septum. We report two complex cases of infective endocarditis complicated by acquired Gerbode defects, outlining the role of two-dimensional (2D) and three-dimensional (3D) transoesophageal imaging.

Heart Failure Hospitalisations in the Hunter New England Area Over 10 years. A Changing Trend

BACKGROUND Heart failure carries a major burden on our health system, mainly related to the high rate of hospital admission. An understanding of the recent trends in heart failure hospitalisation is essential to the future allocation of health resources. Our aim is to analyse the temporal trends in heart failure hospitalisation. METHODS We extracted all separations in the Hunter New England Local Health District between 2005-2014 (n=40,119) with an ICD 10 code for heart failure (I-50) in the first four diagnoses on discharge. The numbers of hospitalisations were age-standardised to the 2001 Australian population and compared based on gender and remoteness. RESULTS There was a decline in the age-standardised hospitalisation. However, there was a clear inflection point between 2009-2010, after which the decline levelled off. The absolute number of hospitalisations increased between 2010 and 2014. Heart failure hospitalisation was higher in males compared to females and rural compared to metropolitan inhabitants. CONCLUSION The gains in heart failure treatment noted in recent years seem to have come to an end. Patients aged 75 years and older are contributing the majority of age-standardised hospitalisations.

Disparities in the incidence of acute myocardial infarction: long-term trends from the Hunter region

Trends in the incidence of acute myocardial infarction (AMI) provide important information for healthcare providers and can allow for accurate planning of future health needs and targeted interventions in areas with an excess burden of cardiovascular disease.

Assessment of cerebral blood flow in adult patients with aortic coarctation.

BACKGROUND Survival into adult life in patients with aortic coarctation is typical following surgical and catheter-based techniques to relieve obstruction. Late sequelae are recognised, including stroke, hypertension, and intracerebral aneurysm formation, with the underlying mechanisms being unclear. We hypothesised that patients with a history of aortic coarctation may have abnormalities of cerebral blood flow compared with controls. METHODS Patients with a history of aortic coarctation underwent assessment of cerebral vascular function. Vascular responsiveness of intracranial vessels to hypercapnia and degree of cerebral artery stiffness using Doppler-derived pulsatility indices were used. Response to photic stimuli was used to assess neurovascular coupling, which reflects endothelial function in response to neuronal activation. Patient results were compared with age- and sex-matched controls. RESULTS A total of 13 adult patients (males=10; 77%) along with 13 controls underwent evaluation. The mean age was 36.1±3.7 years in the patient group. Patients with a background of aortic coarctation were noted to have increased pulse pressure on blood pressure assessment at baseline with increased intracranial artery stiffness compared with controls. Patients with a history of aortic coarctation had less reactive cerebral vasculature to hypercapnic stimuli and impaired neurovascular coupling compared with controls. RESULTS Adult patients with aortic coarctation had increased intracranial artery stiffness compared with controls, in addition to cerebral vasculature showing less responsiveness to hypercapnic and photic stimuli. Further studies are required to assess the aetiology and consequences of these documented abnormalities in cerebral blood flow in terms of stroke risk, cerebral aneurysm formation, and cognitive dysfunction.

Pre-hospital thrombolysis in ST-segment elevation myocardial infarction: a regional Australian experience.

OBJECTIVE The system of care in the Hunter New England Local Health District for patients with ST-segment elevation myocardial infarction (STEMI) foresees pre-hospital thrombolysis (PHT) administered by paramedics to patients more than 60 minutes from the cardiac catheterisation laboratory (CCL), and primary percutaneous coronary intervention (PCI) at the CCL for others. We assessed the safety and effectiveness of the pre-hospital diagnosis strategy, which allocates patients to PHT or primary PCI according to travel time to the CCL. DESIGN, SETTING AND PARTICIPANTS Prospective, non-randomised, consecutive, single-centre case series of STEMI patients diagnosed on the basis of a pre-hospital electrocardiogram (ECG), from August 2008 to August 2013. All patients were treated at the tertiary referral hospital (John Hunter Hospital, Newcastle). MAIN OUTCOME MEASURES The primary efficacy endpoint was all-cause mortality at 12 months; the primary safety endpoint was bleeding. RESULTS STEMI was diagnosed in 484 patients on the basis of pre-hospital ECG; 150 were administered PHT and 334 underwent primary PCI. The median time from first medical contact (FMC) to PHT was 35 minutes (IQR, 28-43 min) and to balloon inflation 130 minutes (IQR, 100-150 min). In the PHT group, 37 patients (27%) needed rescue PCI (median time, 4 h; IQR, 3-5 h). The 12-month all-cause mortality rate was 7.0% (PHT, 6.7%; PCI, 7.2%). The incidence of major bleeding (TIMI criteria) in the PHT group was 1.3%; no patients in the primary PCI group experienced major bleeding. CONCLUSION PHT can be delivered safely by paramedical staff in regional and rural Australia with good clinical outcomes.

Acute myocardial infarction in disseminated mucormycosis infection

A 26 year old female with a history of cystic fibrosis (homozygous delta F508) and bilateral lung transplant presented with a bi-frontal headache one month post bilateral sinus surgery for chronic sinusitis. The provisional diagnosis was bacterial sinusitis. Although nasal swabs had grown Candida and Staphylococcus aureus, …

Specificity of Myocardial Perfusion Imaging: Issues With Proposed MBS Item Review

Myocardial perfusion scanning (MPS) is commonly used to assess patients with an intermediate to high risk of coronary artery disease. Concerns have been raised about the accuracy of this test. There is little recent data regarding the specificity of the MPS in the context of current medical therapy. The primary objective of this study is to determine the specificity of MPS in diagnosing obstructive coronary artery disease. A total of 184 patients fulfilled study criteria. The overall specificity of MPS for obstructive coronary artery disease was 54%.The only demographic variable that influenced specificity was gender: males with a specificity of 66% and females with a specificity of 29% (p-value=0.001). These results suggest that the real world specificity of MPS is lower than previously indicated, particularly in the female population. The limitations proposed by the Cardiac Services Committee Report are therefore unlikely to improve patient outcomes.

Trends in the Incidence of First Acute Myocardial Infarction in Metropolitan and Regional Areas of the Hunter Region

INTRODUCTION There is conflicting information regarding the contemporary incidence of first acute myocardial infarction (AMI) in Australia. We sought to document the regional variations in first AMI incidence in a large health district. METHODS We identified all patients presenting with first AMI in the Hunter region of New South Wales from 2004 to 2013. We calculated age and gender adjusted incidence of AMI and evaluated differences between patients from regional and metropolitan areas. We assessed 30-day and 12-month outcomes, including mortality, through linkage with the NSW Registry of Births Deaths and Marriages. RESULTS The incidence of first AMI in regional areas was persistently higher throughout the study compared to metropolitan areas (IRR 1.244; 95% CI 1.14-1.35; p≤0.001). There were no significant differences between regional and metropolitan areas in 30-day and 12-month outcomes following presentation with first AMI. CONCLUSIONS The study demonstrates persistently higher rates in regional compared to metropolitan areas, supporting the need for implementation of targeted intervention and prevention strategies.

Groin Haemostasis with a Purse String Suture for Patients Following Catheter Ablation Procedures (GITAR Study)

BACKGROUND The most frequent complications from percutaneous electrophysiology procedures relate to vascular access. We sought to perform the first randomised controlled trial for femoral venous haemostasis utilising a simple and novel purse string suture (PSS) technique. METHODS We randomised 200 consecutive patients who were referred for electrophysiology procedures at two different hospitals to either 10minutes of manual pressure or a PSS over the femoral vein and determined the incidence of vascular access site complications. RESULTS The mean age was 61.8±12.1years and 138 (69%) were male. Bleeding requiring addition pressure or a FemStop (Abbott Laboratories, Abbott Park, IL, USA) for complete haemostasis occurred in 17/99 (17%) patients in the PSS arm and 19/101 (19%) patients in the manual pressure arm (p=0.72). There were no cases of haematoma prolonging hospital stay, arterio-venous fistula, pseudoaneurysm or retroperitoneal bleeding. The mean duration to achieve haemostasis was 45seconds in the PSS arm and 10minutes 44seconds in the manual pressure arm (p<0.001). Pain/discomfort associated with haemostasis occurred in 15/99 (15%) patients in the PSS arm and in 29/101 (29%) patients receiving manual pressure (p=0.03). CONCLUSIONS In this randomised trial we demonstrate that an easy to perform PSS is as effective at achieving haemostasis as 10minutes of manual pressure for catheter ablation procedures. The PSS is considerably faster to perform and is more comfortable for patients than manual pressure.

Outcomes following heart failure hospitalization in a regional Australian setting between 2005 and 2014: HF in regional Australia

The aim of the current study is to examine 10 year trends in mortality and readmission following heart failure (HF) hospitalization in metropolitan and regional Australian settings.