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In "4 fold trap", Donnie was in the trap that had absolutely no chance of survival.
Both Leo and Raph were put in lethal traps, but they were set up so there was some chance of escape. A slim chance but still a chance.
Mikey's trap was designed so that it would mutate him. He would still be alive but he wouldn't be the Turtle he had been.
But Donnie trap is essentially a lethal, 3d version of Tetris. And as far as we can tell the game grid descends a seemingly infinite number of levels. And every time he was crushed by a block, or maybe fell off the game grid he would get zapped with high voltage. However, when Leo and the others arrive to free him, Donnie tells him that if he cuts him free he would be fried to death.
We know that Karai at that point in time had it in for Splinter and Leo. Splinter the brain worm forced her to believed he was responsible for her mother's death and her mutation. And Leo because he has defeated her and also because he betrayed her and attempted to the Shredder.
So it's possible Karai had that added feature in Donnie's trap as a fail-safe just in case the other Turtles did survive and escaped. But I think that tidbit was also for April.
While Karai was more experienced as a Kunoichi then April, April has still bested her more than once. And Karai is more than aware of Donnie's infatuation with April since he pretty much advertised that to her by showing up alone to save her in Target: April O'Neil. Even if Donnie's infatuation was one-sided, he still meant something to April so that alone would have been seen as a proverbial "eye for an eye"
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