| RSD | reflex sympathetic dystrophy; relative standard deviation |
|---|---|
| RSDS | reflex sympathetic dystrophy syndrome |
| SA | salicylic acid; saline [solution]; salt added; sarcoidosis; sarcoma; scalenus anticus; secondary ame... |
| SNS | Senior Nursing Sister; Society of Neurological Surgeons; sympathetic nervous system |
| SOH | sympathetic orthostatic hypotension |