In the case of Crosby and Mitchell, the 2nd hit happened after they failed to diagnose the 1st hit as a concussion.
With Hamhuis, they took precaution before he was ready to play again after the Getzlaf hit, so that leads me to believe the "Keep athletes with known or suspected concussions from play until they have been evaluated and given permission to return to play by a health care professional with experience in evaluating concussions" portion of it was fulfilled.
While a repeat concussion (especially his 4th career one) is never a good thing, I don't think it'll be as bad as Mitchell's concussion.
As well as second impact syndrome repeat concussions are also an issue. Once you have suffered one your chances of suffering another with more severe symptoms are greatly increased according to Dr. Karen Johnston. Dr. Karen Johnston is considered the NHL concussion guru and is a neurosurgeon and the director of the Sports Concussion Clinic at Toronto Rehab, said the study highlights the importance of educating parents and physicians that "a concussion is a brain injury each and every time." But she does not think calling a concussion a "mild traumatic brain injury" will help. In fact, she says the word "mild" could be misleading.
Toronto neurosurgeon Dr. Charles Tator agrees. "Some of us prefer 'concussion' rather than 'mild traumatic brain injury,' especially when we're speaking to the public, because that's a whole mouthful and the term 'mild' is incorrect – because we now know that repeated concussions are causing permanent brain damage," he says.
And multiple concussions have long term effects as well. A University of North Carolina study reported in 2005 that retired NFL players faced a 37 per cent higher risk of Alzheimer's than similarly aged U.S. males. It also found repeated concussions significantly raised the chance they'd suffer dementias such as mild cognitive impairment later in life.
Former NHL enforcer Stu Grimson now a lawyer whose career ended in 2002 because of post-concussion syndrome, believes that any study of retired NHLers won't vary a lot from what's been seen in the NFL. He bases his opinion on what he's read and what he's seen others go through in similar circumstances.
"Here's the one thing the docs will tell you, too, is my generation of athletes will be the ones to more accurately tell the tale of what the effects are later in life for somebody that suffers significant head trauma or even insignificant but repeated head trauma."
The Star found at least 30 players whose careers were ended by concussion – or in large part due to concussion – since 1996, when the issue was given more attention after the early retirement of Brett Lindros.
However Colin Campbell disagrees with the figures and minimized the problem at the time:
"Some are legitimate," said Campbell. "I think some you might find aren't legitimate. ... I think there's a small percentage, not a great percentage, of players who use it as an excuse, `Oh yeah, I've got a concussion.' They can milk it. It's a hard thing to really say that you haven't, you know, if you're trying to get some extra insurance money out of it to get paid an extra year or something."
I think Campbell took a few too many shots to the coconut during his career.
@SteveNash I need my brother in law, Manny Malhotra of the Vancouver Canucks, to have a successful eye surgery tomorrow saving his eye and vision.
wow. scary! but given the technology, surgical equipment and knowledge of today I'm going to be cautiously optimistic. If he doesn't end up back with the team, I hope he can at least make a full or close to full recovery for his private life.
What percentage of vision could Manny possibly have in that eye? It looks bleak. Even if he were to get some vision back in that eye, would it be enough to get his quality of life back? Or a career? Not good news at all.