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Difficulty: MediumPhysiological Adaptation

An adult client is receiving care in the intensive care unit for massive gastrointestinal hemorrhage. Despite aggressive fluid resuscitation, the bleeding persists. Which assessment findings suggest that the client has entered the progressive (uncompensated) stage of hypovolemic shock? Select all that apply.

  1. Mean arterial pressure (MAP) of 54 mm Hg54\text{ mm Hg}Answer
  2. Arterial blood gas demonstrating a pH of 7.227.22 and an HCO3−\text{HCO}_3^- of 14 mEq/L14\text{ mEq/L}Answer
  3. C
    A widening pulse pressure from 40 mm Hg40\text{ mm Hg} to 55 mm Hg55\text{ mm Hg}
  4. D
    Arterial blood gas demonstrating a pH of 7.457.45 and a PaCO2\text{PaCO}_2 of 30 mm Hg30\text{ mm Hg}
  5. Urine output of 10 mL/hr10\text{ mL/hr} over the past two hoursAnswer

Answer

The findings indicating the progressive stage of hypovolemic shock are a MAP of 54 mm Hg, an ABG showing metabolic acidosis (pH 7.22, HCO3- 14 mEq/L), and severe oliguria (10 mL/hr).
The progressive (uncompensated) stage of shock is characterized by the failure of compensatory mechanisms to maintain adequate tissue perfusion. A mean arterial pressure (MAP) below 65 mm Hg65\text{ mm Hg} indicates significant hypotension and loss of hemodynamic compensation. Tissue hypoxia forces cells into anaerobic metabolism, producing lactic acid and resulting in severe metabolic acidosis (pH 7.227.22, HCO3−\text{HCO}_3^- 14 mEq/L14\text{ mEq/L}). Additionally, severe vasoconstriction and hypoperfusion to the kidneys cause profound oliguria, such as a urine output of 10 mL/hr10\text{ mL/hr}.

Step-by-Step Solution

1
Analyze the client's clinical scenario.
The client has a severe hemorrhage leading to hypovolemia. The task is to identify signs of progressive (uncompensated) shock.
Understanding the sequential stages of shock is necessary to differentiate early compensatory signs from late progressive signs.
2
Evaluate the hemodynamic parameters.
A MAP below 65 mm Hg (e.g., 54 mm Hg) indicates failure of compensatory mechanisms and inadequate tissue perfusion.
Compensatory mechanisms initially maintain blood pressure; profound hypotension marks the transition to the progressive stage.
3
Interpret the arterial blood gas (ABG) values.
A pH of 7.22 with an HCO3- of 14 mEq/L indicates uncompensated metabolic acidosis, typical of progressive shock. A pH of 7.45 indicates alkalosis, which is an early compensatory sign.
Anaerobic metabolism in progressive shock generates lactic acid, leading to severe metabolic acidosis.
4
Assess organ perfusion indicators such as urine output and pulse pressure.
Urine output of 10 mL/hr reflects severe renal hypoperfusion. Pulse pressure typically narrows in hypovolemic shock, not widens.
Oliguria is a classic sign of progressive shock due to the shunting of blood away from the kidneys.

Key Concept

In the progressive (uncompensated) stage of hypovolemic shock, compensatory mechanisms fail, leading to significant hypotension (MAP < 65 mm Hg), altered tissue perfusion (profound oliguria), and anaerobic metabolism causing metabolic acidosis.
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Physiological Adaptation

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