How much gray area is between yes he had a concussion to no he did not? It is possible it is more of a 10 days of observation/monitoring is needed?
The degree of injury must be considered first, because one might not see it at the onset unless it's a severe case in which one could actually immediately tell. the body has a very generalized response to shock and actual trauma is very difficult to separate and that is why history, physical examination and diagnostic examinations are analyzed as a whole before one could give an actual diagnosis.
I've re-watched the videos of the aftermath several times as painful as it is to see just to get a clearer idea of how they were after. Honestly, I'm swaying with the concussion side but I don't think I'm the right person to ask because I'm emotionally involved at the moment. As a disclosure, I am a pediatrician which by definition covers both Han & Yuzu's age. I am not a neurologist nor a neurosurgeon though, who I think has the best idea whether Yuzu had a concussion or not.
From the videos, after the impact both was still conscious as I could see movements. Temporary disorientation from the shock of the injury is expected whatever kind of injury it is. Let me give an example, a couple of days before my 15th birthday, I crossed a street and was almost hit by a vehicle who did not saw me because there was a vehicle ahead of them. I lost my balanced, fell and kinda hit their side mirror on the process. I can remember to this day that even if i wasn't actually hit, I was just in shock. I totally understand Yuzu's state of mind, because I refused to be brought to a hospital and kept on saying I'm totally fine.
Basing on the video, I first thought Yuzu was nauseous after he fell on the ice so that was actually my first red flag. Turns out he swallowed some blood and just coughed it out. The dizziness and disorientation could have been signs but it could have been due to the shock. However that both of their coaches said they went "unconscious" was my neon light sign that they were concussed. In my experienced and from what I recall from my ER days, once someone becomes unconscious then you label presume they are concussed until ruled out. That is why I still disagree with the ISU's decision to let him skate. I don't know the doctors who examined him and i don't know the extent of their training so I'm not going to delved into that.
I'm just going to leave out some words here so you would understand it from my medical point of view.
Usually a person with a "possible head injury" must be brought to the ER to rule out that possibility. In our Forensic/Legal Medicine class the rule is DO NOT UNDERESTIMATE a head injury. Let's say I was the doctor at the scene, I will label them first with the working impression of Cerebral concussion versus Cerebral Contusion until all means of determining it is not has been exhausted. Determining their vital signs, Glasgow Coma Score (GCS), their alertness/sensorium, orientation and coherence, a complete Neuro Exam will probably the first thing I will do & believed what the doctors actually did. I think they passed this stage thus they were allowed to compete.
However, as a doctor our brain has been impressed with the principle of Non-maleficence or DO NO HARM, which is mentioned several times in the Hippocratic Oath. That is why I tend to be on the side of caution, meaning passing the preliminary exam is not enough to allow them to step back on the ice. However, in Bioethics, there's a principle involving voluntary consent and assent in Pediatrics. In short we only don't need a consent but also an assent. Meaning, Yuzu or Han needs to agree.
As with the information I could gather from the news, here are some facts I could wean from it. Their GCS score falls into the minor head injury category, the risk classification of their minor head injury is low. However, even if the scan is clear, head injury precautions should be monitored for at least 24-72 hours (critical period) and if nothing happens then it's safe to say that they are clear of the immediate effects which are the primary concerns of physicians. Countries adhere to different protocols so this is not really a rigid checklist.
Cerebral Concussion - is an abrupt, brief loss of consciousness immediately after head injury and it's symptoms varies according to the degree of injury. It is often wide spread and the effects could be microscopic/not apparent.
Cerebral Contusion - are more localized and effects are more macroscopic.
It is possible to have both of them.
GCS score - is the most commonly use scale to immediately assess one's consciousness. It ranges from 15 (normal) to 3 (deep coma/brain dead/dead). It is however not enough to determine extent of injury.
Actually, I think its possible that the article just means that the results will be released on the 10th... as in, tomorrow (today in Japan?). Maybe.
I hope that is the case although I highly doubt it is.