Researchers conducted tests on beating mouse hearts whose cells had been genetically engineered to express proteins that react to light and alter electrical activity within the organ.When they triggered ventricular fibrillation in a mouse heart, a light pulse of one second applied to the heart was enough to restore normal rhythm.end-of."It shows for the first time experimentally that light can be used for defibrillation of cardiac arrhythmia," said Mr Bruegmann.The study appears in the Journal of Clinical Investigation. "This is a very important result," said Tobias Bruegmann, from University of Bonn."
We are working towards optical defibrillation of the heart, where light will be given to a patient who is experiencing cardiac arrest, and we will be able to restore the normal functioning of the heart in a gentle and painless manner," said Natalia Trayanova, from Johns Hopkins University.Current devices deliver electric pulses that are extremely painful led vapor tight fixture suppliers and can damage heart tissue, researchers said."In addition to demonstrating the feasibility of optogenetic defibrillation in a virtual heart of a patient, the simulations revealed the precise ways in which light alters the collective electrical behaviour of the cells in the heart to achieve the desired arrhythmia termination," Mr Trayanova said.Current devices deliver electric pulses that are extremely painful and can damage heart tissue, researchers said. The red light, which has a longer wavelength, was more effective in the virtual human tests.Researchers from the Johns Hopkins University in the US and University of Bonn in Germany said that light-based treatment should provide a safer and gentler remedy for patients at high risk of arrhythmia - irregular heartbeat that can cause sudden cardiac death within minutes.To do so, however, the method had to be tweaked for the human heart by using red light to stimulate the heart cells, instead of the blue light used in mice.
"Our simulations show that a light pulse to the heart could stop the cardiac arrhythmia in this patient," said Patrick M Boyle, a Johns Hopkins research professor.To find if this technique could help human patients, researchers performed an analogous experiment within a detailed computer model of a human heart, one derived from MRI scans taken of a patient who had experienced a heart attack and was now at risk of arrhythmia.(Photo: Pixabay) Current devices deliver electric pulses that are extremely painful and can damage heart tissue, researchers said.
Washington: Scientists have shown that beams of light could replace harsh electric shocks to treat patients reeling from arrhythmia - a deadly heart rhythm disorder. Boyle explained that the blue light used in the much smaller mouse hearts was not powerful enough to fully penetrate human heart tissue. This idea springs from advances in the field of optogenetics, in which light-sensitive proteins are embedded in living tissue, enabling the use of light sources to modify electrical activity in cells.