Hemodynamic Ohm's law analog
MAP, CO, SVR relationship
Mnemonic device
MAP = CO × SVR
Mapping
MAP
Mean arterial pressure (your goal)
CO
Cardiac output = HR × stroke volume (preload + afterload + contractility)
SVR
Systemic vascular resistance (vascular tone — drops in sepsis, drops with volatile anesthetic)
Clinical note: If MAP is low: figure out which side dropped. Hot/dry/distended = ↓SVR (give vasopressor). Cold/clamped = ↓CO (give fluid + inotrope).