Mark S Whiteley, Oscar F Leveque
BackgroundThe role of incompetent perforating veins (IPVs) in varicose veins is controversial. There are different views on the mechanism of "incompetence" and, hence, the importance of IPVs. Those following CHIVA and "haemodynamic surgery" principles suggest higher velocities in the deep veins cause blood to flow inwards due to the Venturi effect. The senior author of this case has previously proposed that increased pressure by muscle activity forces blood out of any IPV, a phenomenon called "active" reflux. This case report appears to show active reflux in an isolated IPV using infrared thermography.MethodsA 34-year-old lady presented with a tender lower leg varicose vein due to an isolated IPV. She was placed supine and still for 10 minutes, then performed 10 plantar- and dorsi-flexions. Next, she stood up and stood still for 10 minutes. Her leg was monitored throughout using an infra-red camera (IFC).ResultsImmediately on lying, the IFC showed the vein, indicating blood flowing out of the IPV from the warm deep compartment into the colder superficial compartment (passive/diastolic or gravitational reflux). Over 10 minutes, the signal reduced significantly, suggesting no more blood was being pumped out through the IPV. During 10 plantar- and dorsi-flexions, the signal returned strongly, indicating blood being pumped out of the IPV once again. On standing, the signal was strong initially, but after 10 min of standing still, the signal had faded, indicating a lack of passive (gravitational) reflux in the IPV.ConclusionThis case suggests that reflux through this IPV is due to muscle activity and not by passive reflux due to gravity. This could explain why IPVs can cause fasciocutaneous damage and/or varicose veins in the lower limb. If correct, failure to identify and treat IPVs during varicose vein surgery would mean that the procedure would be inadequate.