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CorVascular
CorVascular

Air-plethysmography venous study

MVO / SVC Determination

MVO / SVC determination uses air plethysmography to measure how much the leg veins fill under cuff occlusion (capacitance) and how fast they drain on release (outflow) — screening for venous outflow obstruction.

Air plethysmographyVenous capacitance (SVC)Maximum outflow (MVO)
venous occlusion
plethysmography
baselineplateauSVCreleaseMVO
What is MVO/SVC Determination?

MVO and SVC tests measure the ability of veins to accommodate and expel blood, reflecting venous compliance and outflow. These parameters are essential for evaluating chronic venous insufficiency and planning interventions.

  • Non-invasive and safe
  • Assesses venous capacitance and outflow
  • Guides treatment for venous disorders
How Does It Work?

Using air plethysmography or similar techniques, the limb is elevated and then occluded to measure venous filling and emptying rates. The results provide quantitative data on venous function and capacity.

  • Standardized occlusion and release protocol
  • Real-time monitoring of venous volume changes
  • Automated data capture and analysis
MVO/SVC Test Process

Test Protocol Flow

1
Patient Positioning

Patient lies supine with leg elevated 45° to empty veins

2
Cuff Application

Thigh cuff inflated to occlude venous outflow while arterial inflow continues (typically ~50–80 mmHg)

3
Venous Filling (SVC)

Outflow occluded; blood accumulates and limb volume rises to a plateau — this rise is the venous capacitance

4
Venous Outflow (MVO)

Thigh cuff rapidly released; the rate the limb empties is the maximum venous outflow

SVC (Segmental Venous Capacitance)

How much the limb fills while venous outflow is occluded (measured supine)

Measurement: Plateau Pressure - Baseline Pressure
MVO (Maximum Venous Outflow)

Rate at which the limb empties after the thigh cuff is rapidly released

Measurement: Plateau Pressure - Drop Pressure
Clinical Significance: Lower values indicate venous outflow obstruction
Clinical Value

MVO/SVC determination is invaluable for:

  • Diagnosing chronic venous insufficiency
  • Guiding treatment and monitoring outcomes
  • Supporting early intervention and improved patient care

MVO/SVC determination is a non-invasive functional screen for venous outflow obstruction, complementing duplex ultrasound in the venous workup.

VasoGuard's Implementation

VasoGuard systems streamline MVO/SVC determination with automated workflows, high-precision sensors, and intuitive software. Clinicians benefit from real-time data, comprehensive reporting, and seamless integration with EMR systems.

  • Automated MVO/SVC protocols
  • High-resolution waveform display
  • Comprehensive data management and export
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