Do you mean “dead twigs” or “twigs without any hint of green growth” - there is a difference! Try snipping back one of the twigs. If it’s dead it’ll be brown all through, slightly shrivelled. A live twig will be plumper, and creamy colour inside, with a layer of green that you may be able to see.
Even if the twigs are dead right back to ground level, Fuchsia will grow back from the roots. Don’t even begin to worry before June