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Heart Disease News and Update

Written by admin on Sep 25th, 2008 | Filed under: cardiovascular UPDATE

Heart disease is a number of abnormal conditions affecting the heart and the blood vessels in the heart. Heart disease is the biggest killer of men and women in the developed world. Most people define heart disease as coronary artery disease, but this is just only one of many forms of heart disease. Types of heart disease are Coronary artery disease (CAD), Abnormal Heart Rhythms, Pericarditis, Cardiomyopathies, Congenital Heart Disease, Heart Valve Disease, Heart Failure, and Abnormal Heart Rhythms.

There are many information source to find much more about Heart Conditions. Theheart.org is one of your choice to find more about Acute Coronary Syndrome and the other forms of heart disease. This website consist of many useful information for people and health care professional. There are Acute Coronary Syndrome (ACS), arrhythmia, brain-kidney-peripheral, clinical-cardiology, heart-failure, hypertension, interventional-surgery, lipid-metabolic, prevention,and thrombosis-risk. Complete enough for people who care about their heart condition. If you want more features of information in this web you can join as a member here. Keep update with the new information.

Heart is one of important organ in our body. So don’t ever start your day without monitoring your heart condition. It’s very important for your life today and future. Not only for you but also for your family and your beloved person. Because your life is not only yours.


Rapid short-duration hypothermia with cold saline and endovascular cooling before reperfusion reduces microvascular obstruction and myocardial infarct size

Written by admin on May 15th, 2008 | Filed under: cardiovascular UPDATE

Background:
The aim of this study was to evaluate the combination of a rapid intravenous infusion of cold saline and endovascular hypothermia in a closed chest pig infarct model.
Methods:
Pigs were randomized to pre-reperfusion hypothermia (n = 7), post-reperfusion hypothermia (n = 7) or normothermia (n = 5). A percutaneous coronary intervention balloon was inflated in the left anterior descending artery for 40 min. Hypothermia was started after 25 min of ischemia or immediately after reperfusion by infusion of 1000 ml of 4°C saline and endovascular hypothermia. Area at risk was evaluated by in vivo SPECT. Infarct size was evaluated by ex vivo MRI.
Results:
Pre-reperfusion hypothermia reduced infarct size/area at risk by 43% (46 ± 8%) compared to post-reperfusion hypothermia (80 ± 6%, p < 0.05) and by 39% compared to normothermia (75 ± 5%, p < 0.05). Pre-reperfusion hypothermia infarctions were patchier in appearance with scattered islands of viable myocardium. Pre-reperfusion hypothermia abolished (0%, p < 0.001), and post-reperfusion hypothermia significantly reduced microvascular obstruction (10.3 ± 5%; p < 0.05), compared to normothermia: (30.2 ± 5%).
Conclusion:
Rapid hypothermia with cold saline and endovascular cooling before reperfusion reduces myocardial infarct size and microvascular obstruction. A novel finding is that hypothermia at the onset of reperfusion reduces microvascular obstruction without reducing myocardial infarct size. Intravenous administration of cold saline combined with endovascular hypothermia provides a method for a rapid induction of hypothermia suggesting a potential clinical application.

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Heart-type Fatty acid-binding protein in Acute Myocardial infarction Evaluation (FAME): Background and design of a diagnostic study in primary care

Written by admin on May 15th, 2008 | Filed under: cardiovascular UPDATE

Background:
Currently used biomarkers for cardiac ischemia are elevated in blood plasma after a delay of several hours and therefore unable to detect acute coronary syndrome (ACS) in a very early stage. General practitioners (GPs), however, are often confronted with patients suspected of ACS within hours after onset of complaints. This ongoing study aims to evaluate the added diagnostic value beyond clinical assessment for a rapid bedside test for heart-type fatty-acid binding protein (H-FABP), a biomarker that is detectable as soon as one hour after onset of ischemia.
Methods:
Participating GPs perform a blinded H-FABP rapid bedside test (Cardiodetect®) in patients with symptoms suggestive of ACS such as chest pain or discomfort at rest. All patients, whether referred to hospital or not, undergo electrocardiography (ECG) and venapunction for a plasma troponin test within 12–36 hours after onset of complaints. A final diagnosis will be established by an expert panel consisting of two cardiologists and one general practitioner (blinded to the H-FABP test result), using all available patient information, also including signs and symptoms. The added diagnostic value of the H-FABP test beyond history taking and physical examination will be determined with receiver operating characteristic curves derived from multivariate regression analysis.
Conclusion:
Reasons for presenting the design of our study include the prevention of publication bias and unacknowledged alterations in the study aim, design or data-analysis. To our knowledge this study is the first to assess the diagnostic value of H-FABP outside a hospital-setting. Several previous hospital-based studies showed the potential value of H-FABP in diagnosing ACS. Up to now however it is unclear whether these results are equally promising when the test is used in primary care. The first results are expected in the end of 2008.

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Hypoxia-inducible factor-1alpha is a critical mediator of hypoxia induced apoptosis in cardiac H9c2 and kidney epithelial HK-2 cells

Written by admin on May 15th, 2008 | Filed under: cardiovascular UPDATE

Background:
Hypoxia inducible factor-1 (HIF-1) is a transcription factor that functions to maintain cellular homeostasis in response to hypoxia. There is evidence that HIF-1 can also trigger apoptosis, possibly when cellular responses are inadequate to meet energy demands under hypoxic conditions.
Methods:
Cardiac derived H9c2 and renal tubular epithelial HK-2 cells expressing either the wild type oxygen regulated subunit of HIF-1 (pcDNA3-Hif-1alpha) or a dominant negative version that lacked both DNA binding and transactivation domains (pcDNA3-DN-Hif-1alpha), were maintained in culture and exposed to hypoxia. An RNA interference approach was also employed to selectively knockdown expression of Hif-1alpha. Apoptosis was analyzed in both H9c2 and HK-2 cells by Hoechst and TUNEL staining, caspase 3 activity assays and activation of pro-apoptotic Bcl2 family member Bax.
Results:
Overexpression of pcDNA3-DN-Hif-1alpha led to a significant reduction in hypoxia ainduced apoptosis (17+2%, P<0.01) in H9c2 cells compared to both control-transfected and wild type Hif-1alpha transfected cells. Moreover, selective ablation of HIF-1alpha protein expression by RNA interference in H9c2 cells led to 55% reduction of caspase 3 activity and 46% reduction in the number of apoptotic cells as determined by Hoechst 33258 staining, after hypoxia. Finally, upregulation of the pro-apoptotic protein, Bax, was found in H9c2 cells overexpressing full-length pcDNA3-HA-HIF-1alpha exposed to hypoxia. In HK-2 cells overexpression of wild-type Hif-1alpha led to a two-fold increase in Hif-1alpha levels during hypoxia. This resulted in a 3.4-fold increase in apoptotic cells and a concomitant increase in caspase 3 activity during hypoxia when compared to vector transfected control cells. HIF-1alpha also induced upregulation of Bax in HK-2 cells. In addition, introduction of dominant negative Hif-1alpha constructs in both H9c2 and HK-2 -cells led to decreased active Bax expression.
Conclusions:
These data demonstrate that HIF-1alpha is an important component of the apoptotic signaling machinery in the two cell types.

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