CHAPTER 40 FLUID AND ELECTROLYTES
2025 to 2026 COMPLETE STUDY GUIDE
REVIEW NOTES PRACTICE QUESTIONS
and DETAILED RATIONALES
What causes hypervolemia (Isotonic overhydration) (3) -CORRECT
ANSWER-1. Inadequately controlled IV therapy (too fast)
2. CHF, kidney disease
3. Sodium overload
What does hypervolemia cause (7) -CORRECT ANSWER-1. edema
2. weight gain
3. crackles
4. distended neck veins
5. bounding pulse
6. increased urine output
7. increased BP
Fluid Volume Excess lab values -CORRECT ANSWER-decreased serum
osmolality ( \/ 285 mOsm/kg
decreased hematocrit ( \/ 45% males. \/ 37% females)
decreased Blood Urea Nitrogen (BUN) level ( \/ 12mg/dL)
, decreased serum sodium level ( \/ 135 mEq/L)
decreased urinary specific gravity ( \/ 1.002)
What kind of electrolyte is sodium? -CORRECT ANSWER-Major
extracellular electrolyte
Cation or Anion: Sodium -CORRECT ANSWER-Cation
What does Sodium do involving fluids? -CORRECT ANSWER-Regulates
ECF volume
What follows Sodium? -CORRECT ANSWER-Water
What is the importance of sodium in the body -CORRECT ANSWER-
Necessary for muscle contraction and transmission of nerve impulses
Hyponatremia lab value -CORRECT ANSWER-Na Less than 135mEq/L
Dilutional causes of Hyponatremia (3) -CORRECT ANSWER-1.
Increased fluid intake
2. IV's
3. tap water edemas
TRUE Causes of Hyponatremia (3) -CORRECT ANSWER-1. Vomiting
2. diarrhea
3. hemorrhage