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Difficulty: MediumPhysiological Adaptation

A client is receiving a continuous intravenous heparin infusion for a deep vein thrombosis. The nurse suspects the client may be experiencing covert internal bleeding leading to early hypovolemic shock. Which clinical manifestations support this physiological adaptation? (Select all that apply)

  1. Blood pressure alters from 128/74 mm Hg to 116/88 mm HgAnswer
  2. Resting heart rate increases from 78 to 114 beats per minuteAnswer
  3. C
    Arterial blood gas reveals a PaCO2 of 52 mm Hg
  4. D
    Skin over the extremities is warm and flushed
  5. Hourly urine output drops to 18 mLAnswer

Answer

The assessment findings that indicate early hypovolemic shock are the narrowing pulse pressure, increased heart rate, and decreased urine output.
The correct manifestations demonstrate the body's compensatory mechanisms during early volume loss. As intravascular volume drops, the sympathetic nervous system triggers tachycardia to maintain cardiac output. It also causes peripheral vasoconstriction, which raises the diastolic blood pressure and narrows the pulse pressure. Additionally, decreased renal perfusion stimulates the renin-angiotensin-aldosterone system (RAAS), resulting in decreased urine output (oliguria) to conserve fluid.

Step-by-Step Solution

1
Identify the primary physiological risk for the client.
The client is on a continuous heparin infusion, placing them at high risk for hemorrhage and subsequent hypovolemic shock.
Recognizing the risk helps focus the assessment on signs of volume depletion and physiological compensation.
2
Analyze the provided vital sign trends for compensatory cardiovascular mechanisms.
The heart rate increases significantly, and the pulse pressure narrows (diastolic pressure rises while systolic pressure drops slightly).
The sympathetic nervous system activates immediately to maintain mean arterial pressure by increasing the heart rate and vasoconstricting peripheral vessels.
3
Evaluate systemic organ perfusion markers.
The urine output has dropped below the minimum expected 30 mL/hr.
The body shunts blood away from the kidneys to protect the brain and heart, triggering the RAAS pathway to retain sodium and water.
4
Differentiate these findings from other etiologies and late-stage decompensation.
Warm/flushed skin and hypercapnia (elevated PaCO2) are rejected.
Warm skin indicates vasodilation (seen in early sepsis), and an elevated PaCO2 indicates hypoventilation, whereas early hypovolemic shock causes cool/clammy skin and hyperventilation (low PaCO2).

Key Concept

Early physiological adaptation to hypovolemic shock involves sympathetic nervous system activation, leading to compensatory tachycardia, peripheral vasoconstriction (narrowing pulse pressure, cool skin), and fluid conservation (oliguria).
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Physiological Adaptation

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