Which symptom indicates decompensated shock?

Decompensated shock occurs when the body's compensatory mechanisms are overwhelmed, leading to a significant decline in physiological function. The presence of altered mental status and a drop in blood pressure are key indicators of this state.

Altered mental status suggests that the brain is not receiving adequate perfusion, which can result from inadequate blood volume or reduced cardiac output. When the blood pressure drops significantly, it indicates that the body's systems are struggling to maintain blood flow to vital organs. This scenario showcases that the body's attempts to compensate for the shock are failing, signaling decompensated shock.

In contrast, other symptoms listed do not demonstrate the severity of decompensated shock. For instance, a normal mental status and blood pressure suggest that the body's compensatory mechanisms are still functioning effectively, indicating compensated shock instead. Elevated blood pressure combined with a thready pulse might reflect a body attempting to compensate, but does not indicate decompensation. Similarly, increased heart rate and shallow breathing might be signs of the body responding to stress but do not provide clear evidence of decompensated shock.

Overall, the combination of altered mental status and a drop in blood pressure distinctly points to a critical worsening condition, characteristic of decompensated shock.