The phrase "a second impact" is correct and usable in written English.
It can be used in contexts discussing events, consequences, or phenomena that occur after an initial impact or occurrence.
Example: "The study revealed that a second impact could lead to even more severe consequences for the environment."
Alternatives: "a subsequent impact" or "a follow-up impact".
And in many cases the condition began with a previous hit and a second impact was the lethal blow.
"[When] playing on with a concussion there is a second impact syndrome that can be fatal if you were to suffer another blow not long after the first, which hasn't been diagnosed properly: that is playing with people's lives.
And then I feel a second impact of that tragedy, for the person who killed her, to have committed such an impulsive and awful act, to have to live with that.
Individuals must also refrain from activities that could result in a second impact to the head or body, including activities such as playing sports, climbing on playgrounds, and riding bicycles.
However, as England pressed for victory in the closing stages, North suffered a second impact which looked far worse after accidentally clashing heads with his team-mate Richard Hibbard when the pair attempted to stop Mike Brown close to the line.
He was eventually replaced with the referee, Nicola Rizzoli, saying after the match: "Shortly after the blow, Kramer came to me asking: 'Ref, is this the final?'" There are serious risks involved with suffering a second impact if concussed and Dr Ian Beasley, the FA's chief medical officer, hopes managers and players in England can learn to understand when a player could be in danger.
A third impact on our security is the increased need for humanitarian responses in the wake of the severe weather emergencies.
Miller adds that as a first impact, rising seas contaminate freshwater resources.
Art is often about a first impact, and the experience is completely up to the individual.
"I think it's an issue that must be looked at, the possibility of heading contributing to a second-impact syndrome," Lezak, a professor of neurology, psychiatry and neurosurgery at the Oregon Health Sciences University, said.
At his inquest yesterday, the coroner found that he had died as a result of "second impact syndrome".
