Hypoperfusion (Shock): Recognition, Causes & Emergency Response

Hypoperfusion is the medical term for shock—a life-threatening state where blood flow fails to meet tissue oxygen demands. Cells switch to anaerobic metabolism, lactate accumulates, and organs begin to fail. It is a time-critical emergency.

Major Causes (Four Categories)

• Hypovolemic: Blood loss (trauma, GI bleed, ruptured aneurysm, ectopic pregnancy) or fluid loss (severe dehydration, burns, third-spacing).
• Cardiogenic: Pump failure (MI, severe cardiomyopathy, arrhythmia, valve rupture).
• Distributive: Vasodilation/shunting — Septic (most common ICU cause), Anaphylactic, Neurogenic (spinal cord injury), Adrenal crisis.
• Obstructive: Physical blockage — Tension pneumothorax, Cardiac tamponade, Massive PE, Air embolism.

Clinical Recognition (Progressive)

• Compensated: Tachycardia, cool extremities, delayed capillary refill, anxiety, normal BP.
• Decompensated: Hypotension, altered mental status, oliguria, mottled skin, metabolic acidosis.
• Irreversible: Multi-organ failure, refractory hypotension, cardiac arrest.

Immediate Action

1. Call 911 / Activate Code Blue.
2. ABCs: Airway, Breathing, Circulation.
3. Lay flat, elevate legs (unless contraindicated—head trauma, respiratory distress).
4. Oxygen if available.
5. Control obvious bleeding (direct pressure, tourniquet for limb hemorrhage).
6. Do NOT give anything by mouth.

Hospital Management

Rapid IV access → crystalloid bolus (30 mL/kg) → blood products if hemorrhagic → vasopressors (norepinephrine first-line) for distributive → source control (surgery, antibiotics, drainage, pericardiocentesis, thrombolysis/embolectomy for PE).

Shock kills fast. Early recognition and aggressive resuscitation save lives.