Strain gauge plethysmography measures which specific physical change in the limb?

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Prepare for the Clinical Sonography III Exam with flashcards and multiple choice questions. Each question includes hints and explanations. Excel in your exam!

Multiple Choice

Strain gauge plethysmography measures which specific physical change in the limb?

Explanation:
Strain gauge plethysmography works by sensing how much the limb expands as blood flows into it. When the limb’s volume increases, its circumference grows and the attached strain gauge stretches. The system detects the resulting length change (strain) of the gauge, and this is used to infer the limb’s volume change. So the specific physical change being measured is the length (strain) change of the gauge itself, which mirrors limb volume changes. The other options describe aspects not directly measured by this method: direct blood volume, cuff pressure, or skin electrical resistance.

Strain gauge plethysmography works by sensing how much the limb expands as blood flows into it. When the limb’s volume increases, its circumference grows and the attached strain gauge stretches. The system detects the resulting length change (strain) of the gauge, and this is used to infer the limb’s volume change. So the specific physical change being measured is the length (strain) change of the gauge itself, which mirrors limb volume changes. The other options describe aspects not directly measured by this method: direct blood volume, cuff pressure, or skin electrical resistance.

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