Which of the following is NOT a sign of shock?

Delirium is not considered a typical sign of shock. Shock is a critical condition that occurs when the body is not getting enough blood flow, which can lead to multi-organ failure if not addressed quickly. The physiological responses to shock include changes that affect the skin, eyes, breathing, and pulse.

Pale, cold, and clammy skin is often seen in shock as a result of poor circulation and vasoconstriction, aiming to preserve blood flow to vital organs. Likewise, vacant eyes with dilated pupils are also characteristic indicators due to decreased blood flow and the body's response to stress. Irregular breathing and pulse are direct results of the body's attempt to compensate for the reduced oxygen and blood flow, reflecting the physiological strain that shock imposes.

Delirium, while it can occur in various medical emergencies, is not specific to shock. It can arise from multiple causes, including infections, metabolic disturbances, or drug effects. Thus, identifying the signs of shock should focus on the physiological changes in circulation and response, making delirium the option that does not fit in this context.