There are a fairly large number of older cases, yes. Probably not many here on SaSu, but generally - even with tricyclic AD's - self poisonings are rarely successful, but can have nasty complications.
Because of these complications (and probably because enough patients died), amitriptyline isn't prescribed as first line AD anymore and usually isn't prescribed to patients who have tried to CBT in the past.
You can find studies that list either a small number of patients who tried to self-poison with amitriptyline and their individual outcomes. Or you look for studies that list the percentage of successful/failed poisonings.
Try the BMJ for example. Or Journal of Emergency Medicine and a few key words.
Like the one below - A study of 250 patients.
I assume that this includes many unplanned, accidental poisonings though (especially those in children).