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Radial artery puncture is a medical procedure performed to obtain a sample of arterial blood for gas analysis. Also it is beginning in TRA Trans Radial Access Cardiac coronary angioplasty . A needle is inserted into the radial artery and spontaneously fills with blood. The syringe is either prepacked with a small amount of heparin to prevent coagulation, or must be ''heparinised'', by drawing up a small amount of heparin and squirting it out again. Most commonly, femoral and radial artery puncture is performed to obtain arterial blood sampling for gas analysis. The partial pressures of oxygen (PaO2) and carbon dioxide (PaCO2), and the pH of arterial blood are important in assessing pulmonary function. These data indicate the status of gas exchange between lungs and blood. ==Contraindications== * Cellulitis or other infections over the radial artery * Absence of palpable radial artery pulse * A negative Allen test (see below), which indicates that only one artery supplies the hand. A Positive Allen Test indicates the blood supply to the hand is normal. * Coagulation defects (relative) 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「Radial artery puncture」の詳細全文を読む スポンサード リンク
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