Timby's Introductory Medical-Surgical Nursing Thirteenth, North American Edition - Caring for Clients With Fluid, Electrolyte, and Acid? Base Imbalances Related

Review Timby's Introductory Medical-Surgical Nursing Thirteenth, North American Edition - Caring for Clients With Fluid, Electrolyte, and Acid? Base Imbalances related questions and content

Upon shift report, the nurse states the following laboratory values: $\mathrm{pH}, 7.44 ; \mathrm{PCO}_2, 30 \mathrm{mmHg}$; and $\mathrm{HCO}_3, 21 \mathrm{mEq} / \mathrm{L}$ for a client with noted acid-base disturbances. Which acid-base imbalance do both nurses agree is the client's current state?

  • A. Compensated respiratory alkalosis
  • B. Uncompensated respiratory alkalosis
  • C. Compensated metabolic acidosis
  • D. Compensated metabolic alkalosis
Correct Answer: A

Rationale: The question states that the client has a history of acid-base disturbance. The nurse would first note that the $\mathrm{pH}$ has returned to close to normal indicating compensation. The nurse then assess the $\mathrm{PCO}_2$ (normal: 35 to $45 \mathrm{~mm} \mathrm{Hg}$ ) and $\mathrm{HCO}_3$ (normal: 22 to $27 \mathrm{mEq} / \mathrm{L}$ ) levels. In a respiratory condition, the $\mathrm{pH}$ and the $\mathrm{PCO}_2$ move in opposite directions; thus, the $\mathrm{pH}$ rises and the $\mathrm{PCO}_2$ drops (alkalosis) or vice versa (acidosis). In a metabolic condition, the $\mathrm{pH}$ and the bicarbonate move in the same direction; if the $\mathrm{pH}$ is low, the bicarbonate level will be low, also. In this client, the $\mathrm{pH}$ is at the high end of normal, indicating compensation and alkalosis. The $\mathrm{PCO}_2$ is low, indicating a respiratory condition (opposite direction of the $\mathrm{pH}$ ).