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Difficulty: MediumPhysiological Adaptation

An adult client presents to the emergency department after three days of intractable diarrhea. Initial assessment reveals a blood pressure of 106/82 mm Hg, an apical pulse of 118 beats per minute, and a respiratory rate of 28 breaths per minute. Laboratory analysis indicates a pH of 7.29, PaCO2 of 32 mm Hg, and HCO3 of 15 mEq/L. Based on these clinical findings, what is the most accurate conclusion regarding the client's condition?

  1. The client is in the compensatory stage of hypovolemic shock with partially compensated metabolic acidosis.Answer
  2. B
    The client is demonstrating stable cardiovascular function but has developed uncompensated respiratory acidosis.
  3. C
    The client is experiencing irreversible hypovolemic shock combined with a primary respiratory alkalosis.
  4. D
    The client has progressed to decompensated shock and is exhibiting uncompensated metabolic alkalosis.

Answer

The client is in the compensatory stage of hypovolemic shock with partially compensated metabolic acidosis.
The correct interpretation requires synthesizing two distinct physiological adaptations. First, the severe fluid loss from diarrhea has triggered the compensatory stage of hypovolemic shock, evidenced by tachycardia and a narrowed pulse pressure (24 mm Hg) while systolic pressure remains maintained. Second, the loss of alkaline intestinal secretions has caused a primary metabolic acidosis (pH 7.29, HCO3 15). The tachypnea (RR 28) and resulting low PaCO2 (32 mm Hg) represent the respiratory system's partial compensation to buffer the acidotic state.

Step-by-Step Solution

1
Analyze the client's vital signs and hemodynamic status.
The client has a narrowed pulse pressure (106 - 82 = 24 mm Hg) and tachycardia (118 bpm), while still maintaining a systolic blood pressure above 100 mm Hg.
These are classic hallmark indicators of the compensatory (early) stage of hypovolemic shock, as the sympathetic nervous system attempts to maintain cardiac output in response to severe fluid loss.
2
Interpret the primary acid-base imbalance from the arterial blood gas values.
The pH is 7.29 (acidosis) and the HCO3 is 15 mEq/L (acidotic).
Because the pH and the bicarbonate level are moving in the same physiological direction, the primary disorder is a metabolic acidosis, which is expected due to the loss of bicarbonate-rich fluids in severe diarrhea.
3
Determine the level of respiratory compensation.
The PaCO2 is 32 mm Hg (alkalotic) and the respiratory rate is elevated (28 breaths/min).
The lungs are attempting to compensate for the metabolic acidosis by blowing off excess carbon dioxide through tachypnea. Because the pH (7.29) has not yet returned to a normal range (7.35 - 7.45), it is considered partially compensated.

Key Concept

Recognition of early hemodynamic deterioration and accurate arterial blood gas interpretation.
Estimated Time:1m 30s
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Topics

Physiological Adaptation

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