Digoxin Error, What should have been done?

I had another question that is bothering me to no end.

I have been "orienting" at the LTC home and have been pretty much passing meds on my own.

There is a situation where one day, I had to hold a residents Digoxin dose d/t an AHR of 50.

According to the MAR, he had been getting the dose every day and an AHR was recorded every day. (I know for a fact that the nurse doesn't even check HR on him, as I shadowed with her)

Anyway, the next day, I caught a discrepency in the MAR and what was actually in the med box. (I know I should have caught it my first day, but I did catch it on my second day)

The MAR and Drs order calls for 0.125 of Dig

The pharmacy has been sending only half of that. 0.06

So, he has only been getting half of his Dig AND with that, he had the bradycardia. Without that one days dose that I held on him, his HR was too erratic for me to count properly.

The RN that has been "orienting" me did nothing. Even during shift change, at report, I had to remind her of this. The nurse getting report was irked that the RN didn't try to fix the meds.

And I am irked that no one seemed to care about his health, or checking on him at all that day. All that RN thinks she has to do is pass meds and do paperwork. She says the Aids check the residents, but I feel a personal responsibility....Is it unreasonable to go in occasionally and check on my residents to make sure they're still breathing?

Am I being anal? Am I being a newbie? I have to ask you guys on here because I don't think I would get a good answer at my job.

Thanks again!