Which statement best describes the late signs of shock?

• A. Falling blood pressure, irregular breathing, mottling or cyanosis, absent peripheral pulses
• B. Normal blood pressure with tachycardia
• C. Hyperdynamic pulses with warm skin
• D. Rapid capillary refill and bounding pulses

Answer: (A)

The main idea being tested is how shock progresses from compensation to decompensation and into a late, decompensated state. In the late stage, the body's mechanisms to maintain perfusion fail, so the signs reflect systemic collapse rather than early warning signs.

The statement that describes falling blood pressure, irregular breathing, mottling or cyanosis, and absent peripheral pulses captures those late-stage changes. Blood pressure drops as cardiac output wanes and vascular resistance can no longer be maintained. Breathing becomes irregular as the brain and central control of respiration suffer from hypoperfusion and hypoxia. Mottling and cyanosis indicate severe poor perfusion and inadequate oxygen delivery to tissues. Absent peripheral pulses show the collapse of blood flow to the extremities due to critically low cardiac output and peripheral vasoconstriction failing to preserve essential organ perfusion.

In contrast, normal blood pressure with tachycardia points to an early, compensated phase where the heart speeds up to maintain circulation. Hyperdynamic pulses with warm skin are typical of early distributive or septic shock, where perfusion can be unusually strong in some areas. Rapid capillary refill and bounding pulses suggest preserved or even elevated perfusion, not the perfusion failure seen in late shock. These indicate the body is still compensating rather than in the final, decompensated stage.