If it's actually gross negligence then it's not just potentially career ending in England and Wales, it's potentially imprisonable (manslaughter by gross negligence, max penalty life imprisonment). You're also entirely liable to being sacked and being struck off the medical register. And the victim's family can and will win a medical malpractice claim against the hospital here (albeit probably for less money than the US: the big payouts here are for cases where long term care is needed).
What we need are better staffing ratios and a proper process for designing out error. The Healthcare Safety Investigation Branch[0] has set out to do for hospitals what the Air Accidents Investigation Branch and NTSB do for aviation safety. Let's hope it helps.