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Normal inferior vena cava: caliber changes observed by dynamic ultrasound
AJR. American Journal of Roentgenology
|August 1, 1980
Summary
Sonography of the inferior vena cava (IVC) is clearest during breath holding or at end expiration. Respiration and the Valsalva maneuver reduce IVC size, hindering optimal visualization for accurate sonographic assessment.
Area of Science:
- Medical Imaging
- Cardiovascular Physiology
- Diagnostic Sonography
Background:
- Conflicting reports exist regarding normal inferior vena cava (IVC) caliber variations during physiologic maneuvers.
- Accurate sonographic assessment of the IVC is crucial for various clinical applications.
Purpose of the Study:
- To investigate the dynamic changes in the caliber of the normal inferior vena cava (IVC) during different respiratory phases and the Valsalva maneuver.
- To determine optimal conditions for visualizing the IVC using sonography.
Main Methods:
- Dynamic sonographic scanning was performed on 25 healthy volunteers.
- The upper portion of the inferior vena cava was observed during simple breath holding, end expiration, inspiration, and Valsalva maneuver.
Main Results:
- Optimal distension and visualization of the IVC were achieved during simple breath holding or at end expiration.
- Inspiration and the Valsalva maneuver generally decreased the IVC caliber in most subjects, impeding visualization.
Conclusions:
- End-expiratory breath hold provides the best sonographic visualization of the inferior vena cava.
- Clinicians should consider respiratory phase and maneuvers when performing IVC sonography to ensure accurate assessment.