Images in Vascular Medicine: Collateral damage–Complications related to compensatory drainage pathways in inferior vena cava atresia - Scorecard - MDSpire
Clinical Scorecard: Vascular Medicine Images: Complications of Collateral Venous Drainage in Inferior Vena Cava Atresia
At a Glance
Category
Detail
Condition
Clinical topic addressed by the source article: Vascular Medicine Images
Key Mechanisms
Collateral pathways partially compensate for IVC atresia and may resemble native venous anatomy, creating a risk of stent misplacement. The authors describe that, after deep venous flow is reestablished, persistently dilated collaterals may act as a venous reservoir, sequestering blood while standing and decreasing cardiac preload.
Target Population
Patients or participants described in the source article.
Care Setting
Care setting described in the source article.
Key Highlights
CT venography showed marked IVC hypoplasia, segmental iliocaval atresia, and numerous collateral veins; a prior stent traversed an iliolumbar collateral rather than the native iliac vein.
IVUS and venography demonstrated longstanding obstruction of both iliocaval pathways; sharp recanalization and IVUS-guided stent reconstruction restored brisk inline flow.
At six weeks, stents were patent and bilateral Villalta scores had decreased from 15 to 7; six-month CT venography showed continued patency and fewer collateral veins.
Orthostatic hypotension with compensatory tachycardia developed despite imaging evidence of stent patency. Duplex imaging showed persistent epigastric venous enlargement and reflux, and residual lower-extremity varicosities.
The authors propose that persistently dilated collaterals may act as a venous reservoir after reconstruction and state that excision of redundant collaterals may be required to resolve orthostatic hypotension.
Guideline-Based Recommendations
Diagnosis
In this case, CT venography showed IVC hypoplasia, iliocaval atresia, collateral pathways, and the course of a previously placed stent.
In this case, IVUS and venography demonstrated chronic iliocaval obstruction and guided recanalization and reconstruction.
Management
In this case, sharp recanalization was used after blunt passage through the left-sided lesion was unsuccessful, followed by serial venoplasty and IVUS-guided stent reconstruction.
The authors state that IVUS together with rotational fluoroscopy can reduce the hazard of mistaking enlarged collaterals for native venous anatomy.
Staged superficial venous treatment in this case included bilateral saphenous ablations, phlebectomy, and removal of the enlarged left epigastric vein.
Monitoring & Follow-up
Follow-up in this case included duplex ultrasound at six weeks to assess stent patency and Villalta scores, and CT venography at six months to assess patency and collateral veins.
After reconstruction, this patient developed orthostatic hypotension and compensatory tachycardia; duplex imaging showed persistent epigastric venous enlargement and reflux, and residual lower-extremity varicosities.
Risks
The authors note that collateral veins resembling native venous anatomy can lead to inadvertent stent misplacement when fluoroscopy is used alone.
The authors propose that, after deep venous flow is reestablished, persistently dilated collaterals may sequester blood while standing and decrease cardiac preload, causing orthostatic hypotension.
Patient & Prescribing Data
One 45-year-old man with severe postthrombotic syndrome, heterozygous Factor V Leiden thrombophilia, bilateral leg swelling, and IVC hypoplasia with iliocaval atresia.
The patient underwent IVUS-guided iliocaval stent reconstruction and staged superficial venous treatment. Symptoms resolved, Villalta scores fell from 15 to 7 at six weeks, and imaging showed patent stents; orthostatic hypotension with compensatory tachycardia nevertheless developed.
Clinical Best Practices
The authors describe CT venography as showing collateral anatomy and the course of the previously placed stent in this case.
The authors state that IVUS with rotational fluoroscopy can reduce the risk of collateral-related stent misplacement.
In this case, follow-up assessed deep venous patency and persistent collateral enlargement; orthostatic symptoms developed despite patent stents.
The authors state that excision of redundant collaterals may be required to resolve orthostatic hypotension after reconstruction; the excerpt does not report that this was performed.
