Long story short.. We responded to a home. Pt. had a chest pain every time he breathes. Vitals are stable, my partner was going to give Nitro but then he said we can't because in our protocol book, after giving nitro Pt. needed to be IV. since we were all basics and cant IV. We ended up giving Aspirin instead. The question is, why does the patient needed to be in IV after giving Nitro? i didn't learn "IV after giving nitro" in emt class as far as i can remember. Any help would greatly be appreciated