Two things surprise me both with the OP and DannyH...
How on earth did you get sorted and out so quick!
Admittedly It's been a few years since I've landed in hospital with DKA, but when I have, each time I was in for a couple of weeks, each time I spent a week or so on the sliding scale to stabilise my bloods, then weren't allowed home until I had gone 48 hours clear of ketone's... And there's nothing worse then going 46 hours ketone free then finding them again, and having to stay for another couple of days...
Hanna
You aren't medically qualified to determine whether a sliding scale is appropriate treatment for a T1 if they are conscious, which shows because it seems that you don't really understand what the sliding scale treatment is about, and the dire straights the patient is actually in...
When you go into DKA crisis, not only are the level of your ketone's dangerous, but their effects mess up your electrolytes as well, you are dehydrated and in a life threatening situation..
So you need fluids quickly to rehydrate, and your electrolytes need to be stabilised asap, the most effective way of doing this is to deliver insulin straight into the blood stream but mixing it with the saline hydration solution...
Injecting insulin into the fat layer, costs precious time with several problems such as slow adsorption, uneven adsorption, increased insulin resistance etc...
Sliding Scales are done on a formula, body weight, BG levles etc to determine how much insulin to saline is required, the objective is to bring the BG down, stabilise the electrolytes and rehydrated the patient...
It's an emergency treatment to start, then it's a stabilising treatment take the sliding scale away too early before everything is stable, it's likely that you will drop back into a DKA crisis very quickly indeed..