Detecting myocardial ischemia with 2(推荐3篇)

Detecting Myocardial Ischemia with 2: Article 1

Introduction:

Myocardial ischemia is a condition characterized by reduced blood flow to the heart muscle, leading to inadequate oxygen supply. Early detection of myocardial ischemia is crucial for timely intervention and prevention of further complications. In recent years, there have been significant advancements in medical technology, specifically in the field of diagnostic imaging, which have revolutionized the detection of myocardial ischemia. This article aims to explore two innovative techniques used for detecting myocardial ischemia: cardiac magnetic resonance imaging (MRI) and coronary angiography.

Cardiac Magnetic Resonance Imaging (MRI):

Cardiac MRI is a non-invasive technique that uses magnetic fields and radio waves to generate detailed images of the heart. It provides valuable information about the structure and function of the heart, making it an effective tool for detecting myocardial ischemia. One of the key advantages of cardiac MRI is its ability to visualize the heart muscle in real-time, allowing for the assessment of blood flow and tissue perfusion. By identifying areas of reduced blood flow or oxygen supply, cardiac MRI can help diagnose myocardial ischemia accurately.

Coronary Angiography:

Coronary angiography is an invasive procedure that involves the injection of a contrast dye into the coronary arteries to visualize any blockages or narrowing. It is considered the gold standard for diagnosing coronary artery disease, which is a leading cause of myocardial ischemia. During the procedure, a catheter is inserted into a blood vessel, usually in the groin or wrist, and guided to the heart. The contrast dye is then injected, and X-ray images are taken to identify any abnormalities in the coronary arteries. Coronary angiography provides precise information about the location and severity of blockages, enabling physicians to determine the most appropriate treatment plan for patients with myocardial ischemia.

Comparison and Conclusion:

Both cardiac MRI and coronary angiography are valuable techniques for detecting myocardial ischemia. While cardiac MRI is non-invasive and provides real-time imaging, coronary angiography offers detailed information about the coronary arteries and blockages. The choice of technique depends on various factors such as patient characteristics, clinical presentation, and the availability of resources. In some cases, a combination of both techniques may be necessary to obtain a comprehensive assessment of myocardial ischemia.

In conclusion, the advancement in medical technology has significantly improved the detection of myocardial ischemia. Cardiac MRI and coronary angiography are two innovative techniques that have proven to be effective in diagnosing this condition. Early detection of myocardial ischemia using these techniques allows for timely intervention and better patient outcomes. Further research and development in this field are needed to enhance the accuracy and accessibility of these diagnostic tools.

Word Count: 438

Detecting Myocardial Ischemia with 2: Article 2

Introduction:

Myocardial ischemia is a common condition that occurs when the blood flow to the heart muscle is reduced, leading to inadequate oxygen supply. Timely detection of myocardial ischemia is crucial for effective management and prevention of complications. In recent years, two innovative techniques have emerged as promising tools for detecting myocardial ischemia: stress echocardiography and positron emission tomography (PET) imaging. This article aims to explore these techniques and their role in the detection of myocardial ischemia.

Stress Echocardiography:

Stress echocardiography is a non-invasive imaging technique that combines echocardiography with physical or pharmacological stress to assess the heart's response to increased workload. During the procedure, ultrasound images of the heart are obtained before and after the administration of a stressor, such as exercise or medication. By comparing the images, physicians can identify areas of reduced blood flow or abnormal motion, indicating myocardial ischemia. Stress echocardiography is widely used due to its high sensitivity and specificity in detecting myocardial ischemia, making it a valuable tool in clinical practice.

Positron Emission Tomography (PET) Imaging:

PET imaging is a nuclear medicine technique that uses a radioactive tracer to visualize the metabolic activity of tissues. In the context of myocardial ischemia, PET imaging can assess the regional blood flow and myocardial viability. A radioactive tracer, such as rubidium-82 or nitrogen-13 ammonia, is injected into the patient's bloodstream. The tracer is taken up by the heart tissue, and its distribution is captured by a PET scanner. Areas with reduced blood flow or viability indicate myocardial ischemia. PET imaging offers high sensitivity and specificity, making it a valuable tool in detecting myocardial ischemia and guiding treatment decisions.

Comparison and Conclusion:

Both stress echocardiography and PET imaging are valuable techniques for the detection of myocardial ischemia. Stress echocardiography is non-invasive, widely available, and cost-effective, making it suitable for routine clinical use. On the other hand, PET imaging offers excellent image quality and provides additional information about myocardial viability, which can aid in treatment planning. The choice of technique depends on various factors, including patient characteristics, resource availability, and clinical indication.

In conclusion, stress echocardiography and PET imaging are promising techniques for detecting myocardial ischemia. Their non-invasive nature, high sensitivity, and specificity make them valuable tools in clinical practice. Further research and advancements in these techniques are needed to enhance their accuracy and accessibility, ultimately improving patient outcomes in the management of myocardial ischemia.

Word Count: 415

Detecting myocardial ischemia with 2 篇三

Detecting myocardial ischemia with 2-D CVIB imaging method--an in vivo animal experiment study

A 2-D cyclic variation of i

ntegrated backscatter (CVIB) imaging method was established for detecting myocardial ischemia. To demonstrate the feasibility and validity of this method, animal experiments were conducted. Acute myocardial ischemia was induced by occluding left anterior descending coronary artery in 10 anesthetized open-chest dogs. While scanning the normal hearts and the ischemic hearts with a B scanner, digital radiofrequency data were acquired by a real-time acquisition system in synchronism. The offline analysis to the radio-frequency signal with the 2-D CVIB imaging method was performed to verify the consistency between the imaging result and the design of the experiment. In addition, 4 dogs in experiment were treated with the heart pacemaker in order to investigate the influence of changing in heart rate on the detection of ischemic myocardium with the proposed method. The experimental result showed that the 2-D CVIB imaging method succeeded in detecting the ischemic myocardium and is a new non-invasive way for the cardiologists to both quantitatively and visually evaluate the contractile performance of the myocardium.

作 者： JIANG Yong BAI Jing YING Kui CHENG Kezheng YU Can 作者单位： JIANG Yong,BAI Jing,YING Kui,YU Can(Department of Biomedical Engineering, Tsinghua Univeristy, Beijing 100084, China)

CHENG Kezheng(Fuwai Hospital, Beijing 100037, China)

刊 名：自然科学进展(英文版) SCI 英文刊名： PROGRESS IN NATURAL SCIENCE 年，卷(期)： 200414(11) 分类号： Q95 关键词： integrated backscatter (IB) myocardial ischemia cyclic variation of integrated backscatter (CVIB) animal study