I've worked in LTC for 13 years and have worked am and night shift as the charge nuse with no one to fall back on and have trained several nurses it sounds like your nurses need retrained on what they do before calling you. You might try telling them what to do ie get manual vitals and assesment ask for them then proceed coaching your nurse thru the process they be lazy or unsure but this way you know the pt ok and the nurses are doing the work and learning to think