Table 2.
Volume studies in neuro-surgical patients.
| ↓Blood Volume in RSW | ↑Blood Volume in SIADH | Urine Na mEq/L | ||
|---|---|---|---|---|
| HN11 hyponatremia | 10 (83%) | 2 | 41–203 | |
| HN12 hyponatremia | 8 (89%) | 1 | – | |
| NN12 normonatremia | 8 (67%) | 4 | ||
| HN13 hyponatremia | 17/18 (94%) | 43–210 | ||
| HN14 Hyponatremia | F | 9/18 (50%) | – | |
| HN14 Hyponatremia | M | 1/7 (14%) |
Volume studies in neurosurgical patients by gold-standard radioisotope dilution methods. Note high prevalence of RSW as compared to SIADH, especially in patients with subarachnoid hemorrhage but also with other neurosurgical diseases and RSW occurring in normonatremic patients. HN, hyponatremia; NN, normonatremia; F, female; M, male. Superscript numbers refer to Nelson et al. (11), Wijdicks et al. (12), Sivakumar et al. (13), and Solomon et al. (14).