Differential diagnosis of cerebral salt wasting syndrome and the syndrome of inappropriate antidiuretic hormone secretion
| Variable | CSW | SIADH |
|---|---|---|
| *<5 mm Hg. CSW, cerebral salt wasting syndrome; CVP, central venous pressure; PCV, packed cell volume; SIADH, syndrome of inappropriate antidiuretic hormone secretion. ↑, increased; ↓, decreased; N, within normal limits; +, present; −, absent. | ||
| Weight | ↓ | ↑ |
| CVP | ↓* | ↑ or N |
| Postural hypotension | + | − |
| Serum osmolality | ↑ or N | ↓ |
| Serum uric acid | N | ↓ |
| Plasma urea | N or ↑ | ↓ or N |
| PCV | ↑ | ↓ or N |
| Urine sodium | ↑↑ | ↑ |
| Urine volume | ↑↑ | ↓ or N |