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ERG was one of the earliest recorded biological potential. The first known ERG was recorded by the Swedish physiologist Alarik Frithiof Holmgren, who recorded it in 1865 on an amphibian retina. [12] However, he failed to understand his findings accurately. He thought the responses he recorded were from the optic nerve instead of the retina. [13]
Earliest manifestation [26] Full development [26] Decrease/disappearance [26] Image Stretched/wavy fibres: 1–2 h: Coagulative necrosis: cytoplasmic hypereosinophilia: 1–3 h: 1–3 days; cytoplasmic hypereosinophilia and loss of striations > 3 days: disintegration: Interstitial edema: 4–12 h: Coagulative necrosis: 'nuclear changes' 12–24 ...
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 ...
Although it is well known that gradient echo imaging can detect hemorrhage, it is best detected with SWI. In the example shown here, the gradient echo image shows the region of likely cytotoxic edema whereas the SW image shows the likely localization of the stroke and the vascular territory affected (data acquired at 1.5 T).
First short burst with a detected afterglow and a possible host galaxy (not unique). GRB 050709: z = 0.161 [Ref 6] HETE-2: First short burst with a detected optical counterpart. GRB 050724: z = 0.258 [Ref 7] Swift: First short burst with a detected radio, optical, and X-ray counterpart, as well as an unambiguous association with an elliptical ...
The history of cardiopulmonary resuscitation (CPR) can be traced as far back as the literary works of ancient Egypt (c. 2686 – c. 2181 BC). [1] However, it was not until the 18th century that credible reports of cardiopulmonary resuscitation began to appear in the medical literature.
The best known example is myocardial perfusion imaging. Typically, a radiotracer ( Tc-99 sestamibi , Myoview or thallous chloride 201 ) may be injected during the test. After a suitable waiting period to ensure proper distribution of the radiotracer, scans are acquired with a gamma camera to capture images of the blood flow.
Godfrey Hounsfield, inventor of first CT scanner. Xenon computed tomography is a modern scanning technique that reveals the flow of blood to the areas of the brain. The scan tests for consistent and sufficient blood flow to all areas of the brain by having patients breathe in xenon gas, a contrast agent, to show the areas of high and low blood ...