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Zorluk: KolayInterpreting Laboratory Results

Match the following arterial blood gas (ABG) profiles on room air to their most appropriate primary acid-base disorder.

  • pH=7.22\text{pH} = 7.22, pCO2=65 mmHg\text{pCO}_2 = 65 \text{ mmHg}, HCO3−=26 mEq/L\text{HCO}_3^- = 26 \text{ mEq/L}Acute respiratory acidosis
  • pH=7.54\text{pH} = 7.54, pCO2=25 mmHg\text{pCO}_2 = 25 \text{ mmHg}, HCO3−=22 mEq/L\text{HCO}_3^- = 22 \text{ mEq/L}Acute respiratory alkalosis
  • pH=7.25\text{pH} = 7.25, pCO2=30 mmHg\text{pCO}_2 = 30 \text{ mmHg}, HCO3−=12 mEq/L\text{HCO}_3^- = 12 \text{ mEq/L}Metabolic acidosis
  • pH=7.48\text{pH} = 7.48, pCO2=42 mmHg\text{pCO}_2 = 42 \text{ mmHg}, HCO3−=32 mEq/L\text{HCO}_3^- = 32 \text{ mEq/L}Metabolic alkalosis

Cevap

Each ABG profile matches a specific acid-base disorder determined by analyzing the directional deviation of pH combined with the primary altering variable (pCO2 for respiratory, HCO3 for metabolic).
Correctly identifying simple acid-base disorders requires a two-step approach: first, defining the primary disorder based on pH (acidosis vs. alkalosis), and second, identifying the driving variable (pCO2 for respiratory vs. bicarbonate for metabolic).

Adım Adım Çözüm

1
Examine the pH to determine the primary state of the blood.
A pH below 7.35 indicates primary acidemia, while a pH above 7.45 indicates primary alkalemia.
The physiological compensatory mechanisms never fully overcorrect the pH, meaning the pH value always points reliably toward the primary underlying disorder.
2
Evaluate the pCO2 and HCO3 to see which value aligns with the pH shift.
Identifies whether the root cause is respiratory or metabolic.
If the pH and pCO2 move in opposite directions, the disorder is respiratory. If the pH and HCO3 move in the same direction, the disorder is metabolic.

Anahtar Kavram

Basic acid-base disorders can be successfully identified by confirming the direction of the pH derangement and matching it to the primary abnormality in either pCO2 or bicarbonate.
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Interpreting Laboratory Results

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