Global Cardiology Science and Practice - الأعداد السابقة

Background: Hypertension is a major risk factor for several cardiovascular diseases (CVD). The prevalence of hypertension is increasing in Bangladesh, especially in urban areas. The objective of this study was to estimate the prevalence of hypertension and its risk factors in an urban area of Bangladesh. Methods: We conducted a cross-sectional survey involving participants aged ≥ 25 years in an urban area in Dhaka between June-December 2012, using multi-stage random sampling. Data on socioeconomic status, tobacco use, physical activity, diet, extra-salt use, family history of hypertension, CVD, anthropometric measurements and blood pressure were collected using modified WHO-STEPS protocol. Hypertension and pre-hypertension were defined according to JNC-7. Multiple logistic regressions models were used to identify risk factors associated with hypertension. Results: The overall age-adjusted prevalence hypertension and pre-hypertension among 730 participants was 23.7% and 19%, respectively, which was higher among males compared to females (23.6% vs 21.71% and 21.7% vs 17.0%, respectively). Bivariate analysis showed significant relationship of hypertension with age, BMI, no physical activity, tobacco use, extra salt intake and family history of stroke/cardiovascular disease. In the multivariate model, factors significantly associated with hypertension were older age (OR 19.18, 95% CI 13.58–28.11), smoking (OR 3.47, 95% CI 2.85–5.19), extra salt intake (OR 1.13, 95% CI 1.04–2.21), and high waist circumference (OR 3.41, 95% CI 2.81–5.29). Conclusions: The prevalence of hypertension and pre-hypertension was high among our study participants. Population-based intervention programs and policies for increased awareness about the risk factors, and life-style modification are essential for prevention of hypertension.

Coarctation of the aorta (C) is the sixth most common lesion in congenital heart disease and represents a spectrum of aortic narrowing that varies from a discrete entity to tubular hypoplasia. This condition was once thought to be a relatively simple lesion that would be “cured” upon repair of the narrowing, however, despite relief of the anatomical obstruction the subsequent risk of early morbidity and death persists. This review outlines the optimal management strategy of this disease from neonatal to adult life and provides insights to approach this straightforward but challenging condition.

We report on a young adult with ALCAPA, who was successfully resuscitated after collapsing in ventricular fibrillation while playing football. This was followed by anatomical correction of the anomaly with a smooth recovery and return to his daily activities. The advantages of this approach are discussed in this brief report.

Human genetic discoveries offer a powerful method to implicate pathways of major importance to disease pathobiology and hence provide targets for pharmacological intervention. The genetics of pulmonary arterial hypertension (PAH) strongly implicates loss-of-function of the bone morphogenetic protein type II receptor (BMPR-II) signalling pathway and moreover implicates the endothelial cell as a central cell type involved in disease initiation. We and others have described several approaches to restore BMPR-II function in genetic and non-genetic forms of PAH. Of these, supplementation of endothelial BMP9/10 signalling with exogenous recombinant ligand has been shown to hold considerable promise as a novel large molecule biopharmaceutical therapy. Here, we describe the mechanism of action and discuss potential additional effects of BMP ligand therapy.

It is believed that simultaneous targeting of two or more of the three pathogenic pathways of pulmonary arterial hypertension (the endothelin, nitric oxide, and prostacyclin pathways) is associated with additive or synergistic effects with subsequent increasing efficacy and improving outcomes. However, there is lack of evidence to guide the use of combination strategy among pulmonary arterial hypertension patients and many questions remain to be answered. One of these vital questions is whether the strategy of upfront initiation of combination therapy could improve patients outcomes compared to the strategy of initial monotherapy. The recently published AMBITION trial represents an important forward step towards answering this question by comparing a strategy of first-line combination therapy (ambrisentan and tadalafil) versus first-line monotherapy (ambrisentan or tadalafil) in patients with pulmonary arterial hypertension.

Background: Calcific aortic valve stenosis (CAVS) is seen in a large proportion of individuals over 60 years. It is an active process, influenced by lipid accumulation, mechanical stress, inflammation, and abnormal extracellular matrix turnover. Various biomarkers (BMs) are studied, as regards mechanisms, diagnosis and prognosis. Methods: In the calcified valves calcium deposition, elastin fragmentation and disorganization of cellular matrix were assessed, together with expression of OPN, OPG, osteocalcin (OCN) and RL2.

We prospectively studied the following serum BMs in 60 patients with CAVS and compared them to 20 healthy controls, free from any cardiac disease: Matrix metalloproteinases (MMP) 2 and 9 and tissue inhibitor of metalloproteinase 1 (TIMP1), which regulate collagen turnover, inflammatory factors, i.e. tumor necrosis factor a (TNFa), interleukin 2 (IL2), transforming growth factor β1 (TGF-β1) which regulates fibrosis, fetuin-A (fet-A), osteopontin (OPN), osteoprotegerin (OPG), sclerostin (SOST), and relaxin-2 (RL2) which positively or negatively regulate calcification. Monocyte chemoattractant protein 1 (MCP-1) which regulates migration and infiltration of monocytes/macrophages was also studied as well as malondialdehyde (MDA) an oxidative marker. Results: Extent of tissue valve calcification (Alizarin Red stain) was negatively correlated with tissue elastin, and RL2, and positively correlated with tissue OCN and serum TIMP1 and MCP-1 and negatively with MMP9.

Tissue OCN was positively correlated with OPN and negatively with the elastin. Tissue OPN was negatively correlated with elastin and OPG. Tissue OPN OPG and RL2 were not correlated with serum levels In the serum we found in patients statistically lower TIMP1, fet-A and RL2 levels, while all other BMs were higher compared to the healthy group. Positive correlations between SOST and IL2, OPG and MDA but negative with TNFa and OPN were found; also MMP9 was negatively correlated with TNFa and MCP-1 was negatively correlated with TIMP1. Conclusion: We found that many BMs expressing calcification, collagen breakdown, or formation, and inflammation are increased in the valve tissue and in the serum of patients with CAVS as compared with healthy group. Our findings may give new insights towards diagnosis but also therapy. Thus antisclerostin, and antiflammatory agents could be tried for preventing aortic calcification progression.

An 11-year old boy was admitted to our intensive care unit following a successfully resuscitated ventricular fibrillation (VF) cardiac arrest during mild physical activity. Six months earlier he was diagnosed with non-obstructive hypertrophic cardiomyopathy (HCM) after an ECG at a pre-sport participating screening had shown left ventricular hypertrophy, marked repolarization abnormalities, and ST depression (Figure 1). There was no family history of HCM or sudden cardiac death (SCD). The child had been completely asymptomatic before the event; specifically, he had never experienced syncopal episodes. Maximal left ventricular wall thickness on echocardiography was 18 mm (z-score 4,5) and an Echo-bike and a 24h Holter monitor had been completely unremarkable. He was on no medications.

Surgical treatment of coronary heart disease has shown its life saving benefits in millions of patients for more than half a century. Attempts to create less invasive ways to achieve similar results have attracted great attention since the introduction of balloon angioplasty in 1977. The fascination with such techniques was hampered by a 30% recurrence rate and a 5% rate of abrupt closure, requiring emergency bypass surgery in most instances.

Angioplasty lost much of its unpredictability with the introduction of stents in 1986. The use of potent anti-platelet regimes added further safety, but recurrence remained a definite thread until the introduction of anti-mitotic coatings during the early years of this century. Very late thrombosis, however, continues to haunt interventionist and patients. Vanishing poly-lactic acid stents time still fail to exhibit comparable mechanical properties at present. So far bypass surgery has not yet lost its attraction in complicated and diffuse disease, despite its much higher patient discomfort.

Takotsubo cardiomyopathy (TTC) is an acute cardiac condition characterized by transient left ventricular dysfunction with wall motion abnormalities, most commonly in the form of apical ballooning. Despite being considered as a generally benign condition, many studies have emphasized potentially sinister outcomes associated with TTC. In this article, we review the most recent results of the International Takotsubo Registry, which investigated the clinical features, prognostic predictors, and outcomes of 1750 patients.

Shikany et al used data from 17,418 participants in the REGARDS study, a national, population-based, longitudinal study of white and black adults aged ≥ 45 years, enrolled between 2003–2007. They examined 536 acute coronary heart disease events at follow-up (median 5.8 years) in relation to five dietary patterns (Convenience, Plant-based, Sweets, Southern, and Alcohol and Salad). After adjustment for baseline variables, the highest consumers of the Southern pattern experienced a 56% higher hazard for acute CHD.

As the global burden of atrial fibrillation (AF) and its attendant economic impact on the healthcare system surges, there is increasing interest in the secondary prevention of AF with various therapies. Of the several identified risk factors for AF, obesity is an important contributor that may be managed with intensive lifestyle modification. Prior studies have demonstrated the short-term and long-term benefits of weight loss in reduction of AF symptoms. In the LEGACY study [Long-Term Effect of Goal-Directed Weight Management in an Atrial Fibrillation Cohort: A Long-Term Follow-Up Study], the investigators evaluated the long-term effects of a weight management program on AF symptoms. Of the 355 patients included in this cohort, outcomes such as AF symptom burden, arrhythmia-free survival, inflammatory markers and structural cardiac changes all appear to have improved in the intense weight loss group as compared to the 2 other groups. Further, the benefits of weight loss appear to be lost when > 5% weight fluctuation (WF) occurred over the 5-year follow-up period. In this review, we discuss the design of the weight management clinic and its impact on the management of AF in the LEGACY study. Given that weight management appears to be an effective intervention that will not have the marketing and financial push that pharmaceutical and device based therapies enjoy, it behooves administrators of AF clinics to develop innovative funding strategies to incorporate weight management programs in order to improve patient-centered outcomes.

The pulmonary circulation is a high-flow/low-pressure system, coupled with a flow generator chamber–the right ventricle–, which is relatively unable to tolerate increases in afterload. A right heart catheterization, using a fluid-filled, balloon-tipped Swan-Ganz catheter allows the measurement of all hemodynamic parameters characterizing the pulmonary circulation: the inflow pressure, an acceptable estimate the outflow pressure, and the pulmonary blood flow. However, the study of the pulmonary circulation as a continuous flow system is an oversimplification and a thorough evaluation of the pulmonary circulation requires a correct understanding of the load that the pulmonary vascular bed imposes on the right ventricle, which includes static and dynamic components. This is critical to assess the prognosis of patients with pulmonary hypertension or with heart failure.

Pulmonary compliance is a measure of arterial distensibility and, either alone or in combination with pulmonary vascular resistance, gives clinicians the possibility of a good prognostic stratification of patients with heart failure or with pulmonary hypertension. The measurement of pulmonary arterial compliance should be included in the routine clinical evaluation of such patients.