The acid base status of a patient reveals a pH = 7.46 and pCO2=30 mm Hg. The patient has a paially compensated primary:
**Question:** The acid base status of a patient reveals a pH = 7.46 and pCO2=30 mm Hg. The patient has a paially compensated primary:
A. respiratory alkalosis
B. respiratory acidosis
C. respiratory compensation
D. primary acidosis
**Core Concept:**
Acid-base disorders are categorized into primary and secondary disorders based on the primary disturbance that leads to the imbalance in the body's pH. In this question, we are evaluating the pH and pCO2 values to determine the primary acid-base disturbance.
**Why the Correct Answer is Right:**
In this scenario, the patient has a pH of 7.46, which is slightly alkalotic (normal range: 7.35-7.45). Additionally, the pCO2 is elevated at 30 mm Hg (normal range: 35 mm Hg - 45 mm Hg). This combination of values indicates that the patient has a respiratory alkalosis.
**Why Each Wrong Option is Incorrect:**
A. **Respiratory acidosis (Option A)** is characterized by a pH <7.35 and a normal or slightly elevated pCO2, which is not the case in this scenario. B. **Respiratory acidosis (Option B)** also involves a pH <7.35 and normal or elevated pCO2, which is not consistent with the provided values. C. **Respiratory compensation (Option C)** is a state where the body counteracts a primary respiratory acidosis by increasing pCO2, which is not the case in this scenario. D. **Primary acidosis (Option D)** is a state with a pH +2 mEq/L) due to an increase in pCO2 (carbon dioxide), which results in alkalemia (base excess > +2 mEq/L) and hypocapnia (lowered pCO2).
**Why the Correct Answer is Right:**
The correct answer, respiratory alkalosis, occurs when the patient's respiratory system is functioning abnormally, leading to an increase in pCO2. This condition results in alkalemia and hypocapnia, as demonstrated by the pH of 7.46 and pCO2 of 30 mm Hg. The patient's respiratory system is compensating for an underlying primary acidosis by increasing pCO2, preventing a severe alkalosis.
**Why Each Wrong Option is Incorrect:**
A. Respiratory acidosis (Option A) is the opposite state where pCO2 is low, resulting in acidemia (base excess < -2 mEq/L) and hypercapnia (elevated pCO2). Since the patient has alkalemia and hypocapnia, respiratory acidosis is ruled