Intensive Care Medicine (ICM) Practice Exam

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Prepare for the Intensive Care Medicine Exam with detailed flashcards and multiple choice questions. Each question comes with hints and explanations to get you exam-ready!

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Which of the following methods can be used to enlarge a vein before drawing blood?

Applying ice to the area
Lowering the limb
Holding the breath
Elevating the limb

The correct answer is: Lowering the limb

Lowering the limb is an effective method to enlarge a vein before drawing blood because it increases venous filling. When the limb is lowered, gravity assists in pooling blood in the veins, thereby making them more engorged and prominent. This can facilitate easier access for venipuncture. In contrast, other methods are either not effective or not appropriate in this context. While applying ice may constrict blood vessels, holding the breath can create tension that may not contribute to vein visibility. Elevating the limb can lead to decreased blood return to the area, making veins less prominent. Therefore, lowering the limb is the most effective and commonly utilized method to enhance vein visibility for blood draws.