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Ketamine, as I currently understand it, is not known for depressing the respiratory system. Usually when people asphyxia during ketamine use it's because they've gone unconscious and then vomit and choke on that, which is one reason why mixing ketamine and alcohol is generally a very bad idea.
"Respiratory: apnea, increased laryngeal, and tracheal secretions, laryngospasm, airway obstruction in infants (may not be drug-related), respiratory depression " see the adverse effects here: https://www.ncbi.nlm.nih.gov/books/NBK470357/
Your reference, at least in this particular quote mentioned in infants so I'm not sure how that translates to teenagers or adults. But, yeah, looks like you're right in at least high doses or very fast IV infusions, which I think this case covers both a high dose and a very rapid IV infusion. But I believe at what would be considered a normal dose there seems to be very little risk of respiratory depression.
"Consequently, ketamine-induced apnea or respiratory depression are transient and rare in case of occurrence, and result frequently from rapid IV infusion."
https://journals.sagepub.com/doi/10.1177/2045125320981498
"Ketamine generally maintains normal pharyngeal and laryngeal reflexes and, therefore, permits spontaneous respiration. It slightly enhances or maintains normal skeletal muscle tone and is associated with cardiovascular and respiratory stimulation. These characteristics make it particularly useful in the emergency department setting for short-term procedures, especially as is often the case when a patient has not been "prepped" for an emergency procedure. Since there is no guarantee of maintenance of the pharyngeal and laryngeal reflexes, there can be no assumption that they will "protect" the airway. Additionally, there may be transient minimal respiratory depression if the medication is administered too rapidly or in too high a dose. Therefore, the physician must be ready to perform emergency intubation." From the same article I linked earlier.
We can go back and forth all day, but ultimately they gave a medication that demanded a higher level of care than was provided and it was an appropriate sentence.
Well, I learned a bit more about ketamine today, so thanks for that. I wasn't attempting to defend what the paramedics did to this person, it was more a slight attempt at defending ketamine against the generalized "ketamine makes you forget to breathe" statement as I felt it made it sound like it's a very common thing.
The dose makes the poison.