A 50 years old male patient with weight 65 kg, pH 7.05, PCO, 15 mmHg, HCO3 5 mEq/L and base excess/ deficit -40 mEq/L. How much sodium bicarbonate has to be given in first 4 hour
**Core Concept**
Severe metabolic acidosis with a base deficit is a life-threatening condition requiring immediate correction with sodium bicarbonate to restore acid-base balance and improve clinical outcomes. The Henderson-Hasselbalch equation and base deficit calculation are essential in determining the required dose.
**Why the Correct Answer is Right**
To calculate the required dose of sodium bicarbonate, the base deficit (BD) is used. In this case, the base deficit is -40 mEq/L. The calculated dose is 0.5 x base deficit x body weight in kg. Therefore, 0.5 x -40 x 65 = 130 mmol.
**Why Each Wrong Option is Incorrect**
* **Option A:** There is no information to calculate the bicarbonate deficit or the required dose based on it.
* **Option B:** Using the Cockcroft-Gault formula for creatinine clearance is not relevant to calculating the sodium bicarbonate dose in this scenario.
* **Option C:** The bicarbonate deficit is not calculated correctly, as it is not equal to the base deficit in this context.
**Clinical Pearl / High-Yield Fact**
When treating severe metabolic acidosis, it's essential to remember that sodium bicarbonate should only be given if the pH is less than 7.1 or if there is evidence of cardiac instability. Also, the dose should be calculated based on the base deficit, not the bicarbonate deficit.
**Correct Answer:** C. 130