Ventricular fibrillation kills thousands of Americans each week by inducing abnormal electrical signals that turn their hearts into quivering "bags of worms" no longer able to pump blood. Victims die within minutes, unless the erratic heart rhythms can be halted with massive jolts of electricity from a defibrillator. Medical researchers have moved one step closer to understanding the causes of ventricular fibrillation through a series of high-resolution movies that show how the condition disrupts the electrical signals that normally govern the heart. The high-speed imaging system produced for the research also revealed that ventricular fibrillation may develop in two distinct phases. The movies pinpointed a series of unusual spiral waves that originate with "rotors" near the surface of the heart. The waves rapidly expand, flow across the heart muscle, merge, and even interfere with each other, causing heart cells to contract in an uncoordinated way. The imaging system used by the research team produces detailed information from as many as 16,000 points on a portion of the exterior surface of the heart. Operating at 838 frames per sec, it allowed the team, consisting of researchers and physicists from the U.S. and Canada, to capture the rapid and disorganized waveforms for analysis. The system relies on fluorescent dyes that respond to electrical changes in the cells of the heart muscle. The researchers expose the beating heart to high-intensity lights, then image and intensify specific wavelengths of light returned by the dyes. Knowing how these unique waves form and behave could provide the information needed to design and test control techniques that may provide an alternative to existing defibrillators--which deliver the electrical equivalent of "a bowling ball dropped onto your chest from a two-story building," according to William L. Ditto, professor of physics at the Georgia Institute of Technology, one of the study's co-authors. E-mail email@example.com .
Halloween isn’t just a time for creative costumes. Thanks to the element14 online design community, the holiday this year also brings us a number of creative electronic device design ideas aimed at making your Halloween party a unique experience.
On April 15, 2010, President Barack Obama gave a major speech at the Kennedy Space Center in Florida, announcing that the US would send astronauts to Mars by the mid-2030s. But in order to do so, NASA would first need to ramp up its capabilities through missions directed toward "a series of increasingly demanding targets," i.e. asteroids.
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