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Difficulty: MediumPhysiological Adaptation

An emergency department nurse is evaluating a client with type 1 diabetes mellitus who was brought in with pronounced weakness, altered mental status, and a two-day history of a gastrointestinal viral infection. The client's initial arterial blood gas (ABG) analysis reveals a pH of 7.22, PaCO2 of 28 mm Hg, and HCO3 of 13 mEq/L. Based on these physiological parameters and the suspected underlying condition, which of the following assessment findings should the nurse expect? (Select all that apply.)

  1. Deep, rapid, and unlabored respiratory patternAnswer
  2. Tachycardia accompanied by weak, thready peripheral pulsesAnswer
  3. Decreased skin turgor and parched mucous membranesAnswer
  4. D
    Hyperactive deep tendon reflexes and muscle tetany
  5. E
    Jugular venous distention with an elevated central venous pressure

Answer

The expected assessment findings are a deep, rapid, and unlabored respiratory pattern; tachycardia accompanied by weak, thready peripheral pulses; and decreased skin turgor with parched mucous membranes.
The client is experiencing diabetic ketoacidosis (DKA), evidenced by the severe metabolic acidosis on the ABG analysis. The body physiologically adapts to metabolic acidosis by increasing the rate and depth of respirations (Kussmaul respirations) to expel excess carbon dioxide. Furthermore, DKA causes severe osmotic diuresis, leading to profound dehydration and impending hypovolemic shock, which manifest as poor skin turgor, dry mucous membranes, tachycardia, and weak peripheral pulses.

Step-by-Step Solution

1
Analyze the arterial blood gas (ABG) values.
The pH is 7.22 (acidemia), HCO3 is 13 mEq/L (metabolic acidosis), and PaCO2 is 28 mm Hg (partial respiratory compensation).
Accurate ABG interpretation is essential to determine the primary acid-base imbalance and the body's compensatory mechanisms.
2
Correlate the ABG results and clinical history with a specific pathophysiological state.
The combination of type 1 diabetes, a precipitating infection, and severe metabolic acidosis indicates the development of diabetic ketoacidosis (DKA).
Identifying the underlying condition allows the nurse to anticipate systemic physiological adaptations and potential complications.
3
Identify expected assessment findings based on the pathophysiology of DKA.
The nurse should expect Kussmaul respirations (to compensate for acidosis) and signs of profound dehydration and early hypovolemic shock (due to osmotic diuresis).
Clinical manifestations are direct results of the body's attempts to manage severe acidosis and profound fluid volume deficit.
4
Evaluate each option against the expected physiological findings.
Select the options describing Kussmaul respirations, tachycardia with weak pulses, and poor skin turgor. Reject options describing alkalosis (tetany) or fluid overload (jugular venous distention).
Distinguishing between expected signs and distractors representing opposing physiological states ensures correct clinical judgment.

Key Concept

Physiological adaptation and compensatory mechanisms in Diabetic Ketoacidosis (DKA) and Metabolic Acidosis
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Topics

Physiological Adaptation

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