At our facility we get PP mag pts. I am fresh out of nursing school and just had a mag pt with crazy BPs (180/100). We get vs q4, if very high BP then more often. We do intake and output, reflexes, and chart how much mag and fluids the mama's have gotten. We usually medicate with labetolol sch and hydrazaline prn for BP more than 150/100 and call MD for possible new parameters are needed.
Hope this answered your question!