wow, i'm sorry.
i would get it examined by a vet.
the La200 could it have been old...dark in color
it could have been anaphalaptic shock. It might not have been noticeable right away or the signs not recognized.
Could have been an air bubble in the needle.
Bad heart?
IBR...a PI that went unnoticed?
So many reasons best for a vet exam to be sure.