Which of the following is NOT a crystalloid?

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Prepare for the NOVA Clinical Anesthesia Exam. Study with flashcards and multiple choice questions, including detailed explanations and hints. Ace your exam with confidence!

Multiple Choice

Which of the following is NOT a crystalloid?

Explanation:
Crystalloids are solutions containing small molecules (electrolytes, sugars) that freely cross capillary walls and distribute quickly between the intravascular and interstitial compartments. Colloids, on the other hand, contain large molecules that remain mainly in the intravascular space and generate oncotic pressure to retain fluid there. Albumin is a protein-based solution, a classic colloid, so it stays in the blood vessels longer and expands plasma volume more efficiently per unit infused. The other options—D5W, normal saline, and Ringer's lactate—are all crystalloids, making albumin the one that is not a crystalloid.

Crystalloids are solutions containing small molecules (electrolytes, sugars) that freely cross capillary walls and distribute quickly between the intravascular and interstitial compartments. Colloids, on the other hand, contain large molecules that remain mainly in the intravascular space and generate oncotic pressure to retain fluid there. Albumin is a protein-based solution, a classic colloid, so it stays in the blood vessels longer and expands plasma volume more efficiently per unit infused. The other options—D5W, normal saline, and Ringer's lactate—are all crystalloids, making albumin the one that is not a crystalloid.

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