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].