ZEPHYR / SCIENCE PHOTO LIBRARY ZEPHYR / SCIENCE PHOTO LIBRARY
Stroke treatment. Coloured angiogram of the brain of a 48 year old patient before (left) and after (right) treatment for a massive cerebrovascular accident (CVA), or stroke. The stroke occurred due to a blocked middle cerebral artery causing areas of ischaemia (lack of blood flow) to parts of the brain. In the right-hand image, blood flow has returned after the blockage was targeted with thrombolytic (clot-busting) drugs (urokinase) and anticoagulants (heparin) using a catheter. The treatment causes the symptoms of the stroke, such as hemiparesis and aphasia (trouble producing and understanding speech), to fade. Angiograms use a contrast dye to highlight blood vessels.
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