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In 1896, E. Haschek and O.T. Lindenthal in Vienna, Austria, reported angiography of blood vessels by taking a series of X-rays after injecting a mixture of petroleum, quicklime, and mercuric sulfide into the hand of a cadaver. [1] Cerebral angiography was first described by Egas Moniz, a Portuguese physician and politician, in 1927. He ...
For all structures except the heart, the images are usually taken using a technique called digital subtraction angiography or DSA. Images in this case are usually taken at 2–3 frames per second, which allows the interventional radiologist to evaluate the flow of the blood through a vessel or vessels. This technique "subtracts" the bones and ...
This is a featured picture, which means that members of the community have identified it as one of the finest images on the English Wikipedia, adding significantly to its accompanying article. If you have a different image of similar quality, be sure to upload it using the proper free license tag, add it to a relevant article, and nominate it.
As part of the pulmonary circulation they carry oxygenated blood back to the heart, as opposed to the veins of the systemic circulation which carry deoxygenated blood. [citation needed] By definition, a vein is a blood vessel that carries blood to the heart, whether oxygenated or deoxygenated.
Capillary blood sampling can be used to test for blood glucose (such as in blood glucose monitoring), hemoglobin, pH and lactate. [ 30 ] [ 31 ] It is generally performed by creating a small cut using a blood lancet , followed by sampling by capillary action on the cut with a test strip or small pipette . [ 32 ]
In the modified Allen test, one hand is examined at a time: [2] The patient is asked to clench their fist for about 30 seconds. Pressure is applied over the ulnar and the radial arteries so as to occlude both of them. Still elevated, the hand is then opened. It should appear blanched (pallor may be observed at the finger nails).
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