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MVO/SVC

The MVO/SVC test determines the Maximum Venous Outflow (MVO) and the Segmental Venous Capacitance (SVC).

The patient lies in a supine position with the legs slightly elevated. A venous occluding cuff is placed on the thigh and a Pulse Volume Recording (PVR) pressure cuff is placed on the calve.

Initially, the sensor (PVR or PPG) is measured and a baseline is determined. Then the thigh cuff is inflated to occlude the venous return (around 60 mmHg) and the changes in the sensor signal are recorded. Once a plateau is reached, the occluding cuff is rapidly deflated. The sensor signal also quickly returns back to the initial baseline. The clinician then determines MVO and SVC based on the sensor signal to determine venous functionality.

Bilateral Simultaneous MVO/SVC Test

Above is an example of a Bilateral Maximum Venous
Outflow (MVO)/Segmental Venous Capacitance (SVC)

specialty test measured with Viasonix FALCON/Pro. Both legs
were measured simultaneously. The graphs above
show the complete measurements and the graphs
below present a zoom-in on the deflation part (blue
rectangle). The resulted MVO/SVC ratio is displayed on the
schematic picture.




MVO/SVC Graph

Single MVO/SVC measurement performed on left leg of
a patient
. The vertical dashed lines indicate the inflation
and deflation times. The horizontal lines indicate the baseline
and plateau.

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