Got a med question that I'm stumped on and I'm probably reading too much in to it as it sometimes the case.Mag sulfate bolus of 4 grams iv over 30 minutes followed by maintenance infusion of 2grams/hour. Pharmacy has provided 1000mL LR with 20 grams mag sulfate.What rate for loading dose?What rate for maintenance dose?Does the 1000mL of LR play a part in this at all? If you want 4 grams in 30 minutes you've got to give 8grams/hr. Am I on the right track? What's next? Thanks for helping a newbie!
cayenne06, MSN, CNM 1,394 Posts Specializes in Reproductive & Public Health. Has 10 years experience. Nov 12, 2014 Yes, you are right that you need to give 8 grams an hour, but you need to figure out mL/hr because that is generally how you program a pump, and it also allows you to "double check" yourself, so to speak- making sure your calculations for g/h and mL/h match up. So yes, the 1000mL of LR is a factor in this problem. Does that help?
KelRN215, BSN, RN 1 Article; 7,349 Posts Specializes in Pedi. Has 16 years experience. Nov 23, 2014 Got a med question that I'm stumped on and I'm probably reading too much in to it as it sometimes the case.Mag sulfate bolus of 4 grams iv over 30 minutes followed by maintenance infusion of 2grams/hour. Pharmacy has provided 1000mL LR with 20 grams mag sulfate.What rate for loading dose?What rate for maintenance dose?Does the 1000mL of LR play a part in this at all? If you want 4 grams in 30 minutes you've got to give 8grams/hr. Am I on the right track? What's next? Thanks for helping a newbie!Well yes, but you can't program a pump to give 8 grams/hr. The 1000 mL LR definitely DOES factor into this equation. If you have 20g/1000 mL, how many mL for 4g? Double that and that's your mL/hr rate for the bolus since you want to give 4g in 30 min.
beckyg323 3 Posts Nov 24, 2014 Thanks so much for your help! Was way over-thinking the question and it was really only desired/have!
nurseprnRN, BSN, RN 2 Articles; 5,114 Posts Nov 24, 2014 Well yes, but you can't program a pump to give 8 grams/hr. The 1000 mL LR definitely DOES factor into this equation. If you have 20g/1000 mL, how many mL for 4g? Double that and that's your mL/hr rate for the bolus since you want to give 4g in 30 min.This may seem stupid, but be sure you set the end volume to 200cc even though you hung a liter bag, because you sure as hell don't want to get distracted and come back an hour and a half later to discover you've given your patient a triple dose. (Some pumps may or may not have a multiprogram feature.)
