In a state of Hypovolemia (mostly Hypovolemia, but I'd like to think Hypoperfusion due to any cause), perfusion to organs is maintained by 4 mechanisms:
(Life) SA-VER
(1) Sympatho-Adrenal System
(2) Vasopressin
(3) Endogenous digitalis-like factor
(4) Renin-Angiotensin system.
When I originally heard of this mnemonic, it also included for A: Atrial Natriuretic peptide. I didnt think that appropriate, because ANP is secreted in response to Hypervolemia, and acts by decreasing cardiac output. That's hardly going to save any lives.
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