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Cardiac catheterization (heart cath) is the insertion of a catheter into a chamber or vessel of the heart. This is done both for diagnostic and interventional purposes. Subsets of this technique are mainly coronary catheterization, involving the catheterization of the coronary arteries, and catheterization of cardiac chambers and valves of the cardiac system. ==Procedure== "Cardiac catheterization" is a general term for a group of procedures that are performed using this method, such as coronary angiography and left ventricle angiography. Once the catheter is in place, it can be used to perform a number of procedures including angioplasty, percutaneous coronary intervention (PCI), balloon septostomy, electrophysiology study or catheter ablation. Procedures can be diagnostic or therapeutic. For example, coronary angiography is a diagnostic procedure that allows the interventional cardiologist to visualize the coronary vessels. Percutaneous coronary intervention, however, involves the use of mechanical stents to increase blood flow to previously blocked (or occluded) vessels. Other common diagnostic procedures include measuring pressures throughout the four chambers of the heart and evaluating pressure differences across the major heart valves. Interventional cardiologists can also use cardiac catheterization to estimate the cardiac output, the amount of blood pumped by the heart per minute. Cardiac catheterization requires the use of fluoroscopy to visualize the path of the catheter as it enters the heart or as it enters the coronary arteries. The coronary arteries are known as "epicardial vessels" as they are located in the epicardium, the outermost layer of the heart.〔Malouf JF, Edwards WD, Tajik A, Seward JB. Chapter 4. Functional Anatomy of the Heart. In: Fuster V, Walsh RA, Harrington RA. eds. ''Hurst's The Heart, 13e.'' New York, NY: McGraw-Hill; 2011. http://accessmedicine.mhmedical.com/content.aspx?bookid=376&Sectionid=40279729. Accessed May 09, 2015.〕 Fluoroscopy can be conceptually described as continuous x-rays. The use of fluoroscopy requires radiopaque contrast, which in rare cases can lead to contrast-induced kidney injury (see Contrast-induced nephropathy). There are two major categories of cardiac catheterization:〔Leopold JA, Faxon DP. Diagnostic Cardiac Catheterization and Coronary Angiography. In: Kasper D, Fauci A, Hauser S, Longo D, Jameson J, Loscalzo J.eds. 'Harrison's Principles of Internal Medicine, 19e''.'' New York, NY: McGraw-Hill; 2015. http://accessmedicine.mhmedical.com/content.aspx?bookid=1130&Sectionid=79742087. Accessed May 09, 2015. 〕 * Left heart catheterization allows for direct intervention in cases of coronary artery occlusion. This technique is also used to assess the amount of occlusion (or blockage) in a coronary artery, often described as a percentage of occlusion. A thin, flexible wire is inserted into either the femoral artery or the radial artery and threaded toward the heart until it is in the ascending aorta. At this point, the wire can be maneuvered into the coronary ostia and into the coronary arteries. A catheter is guided over the wire and enters either the left or right coronary artery. In this position, the interventional cardiologist can inject contrast and visualize the flow through the vessel. If necessary, the physician utilize percutaneous coronary intervention techniques, including the use of a stent (either bare-metal or drug-eluting) to open the blocked vessel and restore appropriate blood flow. In general, occlusions greater than 70% of the width of the vessel lumen are thought to require intervention. However, in cases where multiple vessels are blocked (so called "three vessel disease"), the interventional cardiologist may opt instead to refer the patient to a cardiothoracic surgeon for coronary artery bypass graft (CABG; see Coronary artery bypass surgery) surgery. * Right heart catheterization allows the physician to determine the pressures within the heart (intracardiac pressures). In this case, the heart is most often accessed via the femoral vein; neither the femoral artery nor the radial artery are used. Values are commonly obtained for the right atrium, right ventricle, pulmonary arteries, and for the pulmonary capillary "wedge" pressures, which approximate the pressure values of the left-sided heart chambers. Right heart catheterizations also allow the physician to estimate the cardiac output, the amount of blood that flows from the heart each minute, and the cardiac index, a hemodynamic parameter that relates the cardiac output to a patient's body surface area. Determination of cardiac output can be done by releasing a small amount of normal saline in one area of the heart and measuring temperature changes over time in another area of the heart. It is important to note that the coronary arteries are not accessed during a right heart catheterization. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Cardiac catheterization」の詳細全文を読む スポンサード リンク
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