A patient is diagnosed with chloroquine resistant falciparum malaria. His treating physician advises nurse to administer quinine by IV infusion. The preferred IV fluid for quinine infusion is:
Quinine is an antimalarial drug, and when given intravenously, it's important to use the correct diluent to prevent precipitation or adverse reactions. I remember that quinine can form insoluble complexes with certain ions. Specifically, calcium ions might cause precipitation. So, the IV fluid should not contain calcium.
Now, the correct answer is likely a fluid that doesn't have calcium. Common IV fluids include normal saline (0.9% NaCl), dextrose in water, and others. Normal saline contains sodium and chloride but no calcium. Dextrose solutions might also be acceptable. However, some fluids like Ringer's lactate contain calcium, so they would be contraindicated here.
Looking at the options, if the correct answer is the one that's calcium-free, then the preferred fluid would be something like 5% dextrose in water or normal saline. Wait, but quinine is typically diluted in 5% dextrose in water (D5W) because it's more compatible. Normal saline is also possible, but I need to confirm. Also, some sources mention that quinine should not be mixed with solutions containing calcium, so the correct fluid is one that's calcium-free. So the correct answer is probably 5% dextrose in water. Let me check the options again. The options here are not listed, but the correct answer is the one that doesn't contain calcium. So if the options include normal saline (which is acceptable) and Ringer's lactate (which contains calcium), the correct answer would be the one without calcium. Wait, but quinine is usually given in 5% dextrose. Maybe the correct answer is 5% dextrose in water. Therefore, the preferred IV fluid is 5% dextrose in water (D5W) because it doesn't contain calcium, preventing precipitation. If the options include D5W, that's the right answer. The other options that include calcium, like Ringer's lactate, are incorrect. Also, normal saline is okay, but quinine is more commonly diluted in dextrose. So the answer is D5W.
**Core Concept**
Quinine, an antimalarial agent, must be diluted in a calcium-free solution to prevent precipitation. Calcium ions (Ca²⁺) in certain IV fluids form insoluble complexes with quinine, risking intravenous precipitation and tissue damage. This principle is critical in safe quinine administration.
**Why the Correct Answer is Right**
The preferred IV fluid for quinine is **5% dextrose in water (D5W)**. Quinine forms a precipitate when mixed with calcium-containing solutions (e.g., Ringer’s lactate or normal saline with added calcium). D5W is calcium-free, ensuring stability and safety. Quinine’s solubility in dextrose-based fluids prevents chemical incompatibility, which could otherwise cause life-threatening reactions like hypotension or arrhythmias.
**Why Each Wrong Option is Incorrect**
**Option A:** *Normal saline (0.9% NaCl)* contains no calcium but is not the preferred choice for quinine