Mechanism of venous drainage Varicose veins Deep vein thrombosis

1. Venous drainage
Dr Rajiv Ranjan
RIMS, Ranchi

2. Initiation

3. 2 integrated & coexisting
Venous systems
superficial venous system : primary, suprafascial,more
distensible & lies in loose connective tissue
Deep venous system : secondary(conduit), subfascial, thicker
walled & surrounded by dense connective tissue
Account for 80-90% of venous return

4. Venous return mechanism
Deep fascia

5. Venous return mechanism
Intramuscular pump
Soleal pump
Sole pump
Pterygoid plexus

6. Venous return mechanism
venae comitantes

7. Venous return mechanism
Respiratory pump

8. Venous return mechanism
SNS

9. Venous return mechanism
Valves

10. Venous return mechanism

11. Varicose vein
Valves prevent downward & outward flow

12. Trendelenburg Test
Test devised to show competency of the valves in the
superficial and deep veins in patients with varicose veins
Torniquet placed at
a) Upper thigh
b) Above knee
c) Below knee
Checks valvular incompetence of perforator as well as
superficial veins

13. Trendelenburg Test

14. Cause :
injury,
surgery,
certain medications and
limited movement