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IVC phasicity refers to the variability in the diameter of the inferior vena cava (IVC) during the respiratory cycle. During inhalation, the IVC typically expands due to decreased intrathoracic pressure, while during exhalation, it narrows as intrathoracic pressure increases. This phasic change can be used as a clinical indicator of fluid status and right atrial pressure in patients, particularly in critical care settings. Evaluating IVC phasicity helps assess volume responsiveness and guide fluid management.

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1w ago

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