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A bleeding trauma patient — hypotensive, tachycardic; fluids and blood, find the bleed. Hypovolemic shock (bleeding — trauma: hypotension, tachycardia, cold clammy, oliguria): stop bleeding (pressure, tourniquet, surgery) + fluids + blood (1:1:1). Cardiogenic (MI — pump failure: dobutamine, revascularize). Distributive — septic (warm, bounding — norepinephrine + antibiotics), anaphylactic (adrenaline IM), neurogenic. Obstructive (tamponade, tension pneumothorax — relieve). Burns (rule of nines — Parkland: 4ml × kg × % — half in 8h; depth — 1st red, 2nd blisters, 3rd insensate white; inhalation — hoarseness, soot — intubate early). The cold clammy skin is hypovolemia — warm bounding is sepsis.