Hi Jessica, i think this may depend on each individual country's medical safety standards. In NZ Ketamine is certainly used for surgical purposes too. Ofcause, prior to surgery surgeons should do a survey with you, go through medications/ substances that you are allergic to. For me for example, i can not take paracetamol. Ofcause if i had surgeries that means whatever pain med the doctors will prescribe me afterwards, should definitely not contain paracetamol. Anesthetic should be a same, but if there's not risk of allergy, or not any known allergy, maybe Ketamine is standard sole anaesthetic agent in Korea.
Here's the New Zealand medsafe datasheet, this means it is medically safety approved in NZ Ministry of Health, therefore a good chance it is also in Korea and many other countries. However, each country is different, and it is only safe under a qualified medical anesthetist. As for its uses in veterinary purposes, well yes sure, many drugs we use on humans are used on animals, and vice versa. Chemicals and chemicals, they work pretty much the same on living organisms, it is just used in different dosages.
http://www.medsafe.govt.nz/profs/datasheet/k/ketamineinf.pdf
Note in the precaution section: "Post-operative confusional states may occur during the recovery period (see
Precautions, Emergence Reaction). " <-- this is very very common, confusion occurs in most patients after operations.
As for abuse, yes its true, any central nervous system depressant can be abused in the wrong hands. However, you shouldnt be concerned as this is one off thing. You won't be on this med on regular basis, therefore there's no chance of dependency developing. Adverse however, is maybe what we are concerned about here. Unfortunately, all meds come with it, and especially anesthesia, will give a "trip" like experience, and feel abit sick after the med wears off. I see it all the time, patients start to get confused, and move their arms about in bed after surgery. If you are not allergic to any of the components of ketamine, you shouldnt be concerned about it, if its done by a safe anesthetist ofcause.
The main concern here is the danger of CNS depressants in the wrong hands; if it's not done by a ethical, professional/ medical qualified anesthetist with experience, no matter what anesthesia is used - Ketamine or not, there is chance of mortality. That is why i think clinical practitioners experiences/ qualifications and any clinic incident histories are very important to look into. If not managed and monitored properly, anesthetics can be dangerous and lethal by stopping respiration and contraction of heart.