from the TLS:

On my first visit to Moscow, I met one of Lenin’s embalmers. “When I began, the body was in a poor state”, said Styopa, whose expertise was the use of electricity. Skin grafts and a new partial-vacuum glass sarcophagus had helped to inhibit decay, but Styopa’s shock treatment had reversed it. “Once every two or three months, a high-voltage charge was applied to keep up the tone. But the first time we tried it I overestimated the power needed. Lenin suddenly sat up from the table, his arms shook, and his lips started to quiver. I thought he was going to speak. It was quite a shock. After that, we reduced the voltage.”