Examkin

Soru

Zorluk: OrtaPhysiological Adaptation

A surgical unit nurse is evaluating the clinical status of four clients who recently underwent major abdominal procedures. Based on the documented assessments, which client finding should the nurse recognize as the earliest physiological indicator of a developing hemorrhagic shock state?

  1. A
    An arterial blood gas result showing a pH of 7.377.37, PaO2\text{PaO}_2 of 9292 mm Hg, and PaCO2\text{PaCO}_2 of 4242 mm Hg
  2. B
    A sudden decline in systolic blood pressure below 9090 mm Hg accompanied by severe diaphoresis
  3. A resting heart rate increasing from 7676 to 9898 beats per minute and a progressively narrowing pulse pressureCevap
  4. D
    A transient drop in blood pressure accompanied by dizziness immediately upon transitioning from a supine to a standing position

Cevap

The earliest indicator is a resting heart rate increasing from 76 to 98 beats per minute and a progressively narrowing pulse pressure.
During the initial (compensated) stage of hemorrhagic shock, the body's physiological adaptation involves activating the sympathetic nervous system to maintain adequate tissue perfusion. This response triggers peripheral vasoconstriction (which elevates diastolic pressure and narrows the pulse pressure) and an increased heart rate to sustain cardiac output long before the systolic blood pressure drops.

Adım Adım Çözüm

1
Analyze the physiological phases of hemorrhagic shock.
Identify that the initial (compensatory) stage involves sympathetic nervous system activation to maintain cardiac output before blood pressure falls.
Understanding the timeline of shock progression is necessary to distinguish early signs from late decompensation.
2
Evaluate the clinical findings in each option against the compensatory shock phase.
Tachycardia and a narrowing pulse pressure match the expected peripheral vasoconstriction of the compensatory phase.
Vasoconstriction raises diastolic blood pressure, narrowing the gap between systolic and diastolic values (pulse pressure) while the heart pumps faster to compensate for volume loss.
3
Rule out alternative distractors reflecting late shock, normal findings, or positional changes.
Severe hypotension is a late sign, the ABG values are entirely normal, and orthostatic changes upon standing are expected positional responses.
Eliminating findings that do not fit the specific criteria of 'earliest systemic shock indicator' confirms the correct choice.

Anahtar Kavram

Early Compensatory Mechanisms in Hypovolemic/Hemorrhagic Shock
Bu soruyu puanla

Konular

Physiological Adaptation

Bu konudan daha fazla soru