BV BV UNa
  ↓RSW ↑SIADH mEq/L
Nelson-HN 10 (83%) 2 41-203
Wijdicks-SAH      
HN 8 (89%) 1 -
NN 8 (67%) 4  
Sivakumar      
HN 17/18(94%)   43-210
Volume studies-neurosurgical patients
Table 2: Summary of volume studies in neurosurgical patients. Note increased volume in SIADH and evidence of RSW in normonatremic patients. Numbers in parentheses indicate the percent of patients with RSW [23,24,28].