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Zorluk: OrtaPhysiological Adaptation

A nurse is caring for a client who experienced massive hematemesis secondary to a bleeding peptic ulcer. The bleeding has been medically managed, but the nurse is performing frequent assessments to monitor for hypovolemic shock. Which assessment finding indicates the client is currently in the initial compensatory stage of shock?

  1. A narrowing pulse pressure with a slight increase in diastolic blood pressureCevap
  2. B
    A sudden decline in systolic blood pressure to 84 mm Hg84\text{ mm Hg}
  3. C
    An arterial blood gas showing a pH of 7.317.31 and a PaCO2PaCO_2 of 50 mm Hg50\text{ mm Hg}
  4. D
    Profound lethargy and an inability to respond to verbal stimuli

Cevap

A narrowing pulse pressure with a slight increase in diastolic blood pressure is the correct early indicator.
During the initial compensatory stage of hypovolemic shock, the body attempts to maintain cardiac output and tissue perfusion through sympathetic nervous system activation. This leads to peripheral vasoconstriction, which elevates the diastolic blood pressure while the systolic pressure remains stable, resulting in a narrowed pulse pressure. Recognizing this subtle change allows for early intervention before hemodynamic collapse occurs.

Adım Adım Çözüm

1
Recall the sequential stages of shock and their associated clinical manifestations.
The stages are compensatory (early), progressive (intermediate), and irreversible (late). The compensatory stage relies on neural, hormonal, and biochemical mechanisms to maintain perfusion.
Identifying the physiological adaptations that occur in each stage is necessary to pinpoint early assessment findings.
2
Analyze how the body dynamically compensates for acute fluid volume loss in the early stage.
The sympathetic nervous system triggers widespread vasoconstriction. This selectively raises the diastolic pressure while the systolic pressure remains relatively normal, effectively narrowing the pulse pressure.
This specific physiological adaptation helps maintain blood flow to vital organs during initial volume depletion before profound hypotension occurs.
3
Evaluate and eliminate the incorrect options based on the expected timeline of shock progression.
Hypotension and unresponsiveness are identified as late (progressive) signs, while respiratory acidosis contradicts the early compensatory hyperventilation (which causes respiratory alkalosis).
Systematically ruling out late signs and opposing acid-base imbalances confirms the correct early indicator.

Anahtar Kavram

Pathophysiology of Shock and Compensatory Mechanisms
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Konular

Physiological Adaptation

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