What are two scenarios that must be in consideration before using HS?
1. Rule out hypoK as cause of HypoNa. Treat K depletion 1st.
2. If 150mEq NaHCO3 must be used, avoid adding to NS (850ml NS added will make 3% HS). If need infusion of NaHCO3, add it to D5W or sterile water