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WEDNESDAY, Nov. 9, 2016 (HealthDay News) -- High-frequency electrical stimulation of the spinal cord may relieve severe chronic back pain more effectively than conventional low-frequency stimulation, a new study finds.

In initial testing, the device -- called the Senza system -- reduced leg and back pain scores by at least half in 80 percent of patients. After two years, 76 percent of the patients with chronic back pain still had reduced pain, as did 73 percent of patients with chronic leg pain, the researchers found.

"Over the last 40 years, we have used low-frequency stimulation for leg and back pain, and it was relatively successful with about 50 percent of patients getting about 50 percent of their pain relieved," said lead researcher Dr.

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