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Rule of thumb: carotid ≈ ≥60, femoral ≈ ≥70, radial ≈ ≥80 systolic. Carotid present with absent radial implies ~60–80; 80 is best estimate. Use for rapid shock assessment when cuffs are unreliable; trend findings and treat underlying cause.

The cold zone is safe for medical treatment, command, and staging. The hot zone is for direct hazard contact; the warm zone is for decontamination. Exclusion zone is a synonym for hot zone. Proper zoning ensures responder and patient safety.

Red blood cells transport oxygen bound to hemoglobin and return carbon dioxide to the lungs. White blood cells (Option A) fight infection. Platelets/clotting factors (Option C) control bleeding. BP regulation (Option D) involves kidneys and vasculature. Hypoxia or anemia directly affects RBC function and oxygen delivery.

Airway comes first in ABCs. Severe bleeding (Option A) is a high priority but after airway is secure. Radial pulse (Option B) is circulation. Altered mental status (Option D) is secondary to airway, breathing, and circulation.

Once an advanced airway is in place, continuous compressions are given with asynchronous ventilations at 8–10/min. This avoids pauses. Ratios (Option C) apply only without advanced airway. Hyperventilation reduces perfusion.