Heparin-induced thrombocytopenia with thrombosis after endovascular aneurysm repair

Heparin-induced thrombocytopenia is an immune-mediated syndrome that results from unfractionated heparin or low molecular weight heparin exposure. It often remains unrecognized and undertreated and can cause limb and/or life-threatening thrombosis. The authors present 2 cases of thrombosis: one arterial and the other venous that occurred following endovascular abdominal aortic aneurysm repair. To the authors' knowledge, this is only the second report of arterial thrombosis and the first of deep vein thrombosis as a result of heparin-induced thrombocytopenia developing following endovascular abdominal aortic aneurysm repair. This underscores the importance of considering heparin-induced thrombocytopenia as a potential cause for postendovascular thrombotic complications in the patient who develops thrombocytopenia following this procedure.     

Successful salvage of venous thrombosis of a free flap by creation of a venocutaneous fistula

This report describes the creation of a venocutaneous fistula to salvage a free fibular osteocutaneous flap compromised by extensive venous thrombosis. This technique has previously been described for salvage of digital replants, but this is the first report of a venocutaneous fistula being used to salvage a free flap. A 21-year-old woman underwent a 9-cm resection of the distal left tibia for an aneurysmal bone cyst. A contralateral right fibular osteocutaneous free flap was used for reconstruction. On postoperative day 2, the skin paddle showed evidence of venous congestion. Reexploration demonstrated extensive thrombosis throughout the entire venous system of the flap. The venae comitantes were transected as far back as possible and brought to the surface of the skin through two small stab wounds to allow venous egress. After a short course of heparin and dextran, the skin flap healed uneventfully and both osteosynthesis sites consolidated. A venocutaneous fistula provides a path of relatively low resistance for venous outflow, improving the arterial inflow-venous outflow balance for a short time until neovascularization and collateral venous channels develop. The venocutaneous fistula technique may be considered for salvage of free flaps compromised by extensive venous thrombosis.     

Intermittent short saphenous vein phlebotomy: an effective technique of relieving venous congestion in the distally based sural artery flap

INTRODUCTION: Venous congestion is the main cause of failure in the distally based sural artery flap. Herein, we present our technique of phlebotomy to relieve flap congestion. Venous blood is intermittently drained via an exteriorized segment of the short saphenous vein until flap circulation normalizes. METHODS AND MATERIALS: From 2000 to 2005, 34 distally based sural artery flaps were performed. In all patients, an extra 5 cm of the short saphenous vein was incorporated with the flap during harvest. Fourteen flaps were noted to be congested after inset. In 2 patients, supercharging was performed. In the remaining 12 patients, intermittent phlebotomy was performed through an externalized segment of the short saphenous vein on the operating table and hourly thereafter until venous congestion improved. RESULTS: All flaps survived. The mean duration of phlebotomy was 30 hours, and mean blood loss in the first 24 hours was estimated to be 94 mL. The color of the flap was noted improved gradually over this period as it established a more efficient venous drainage. CONCLUSION: Our approach of providing an additional venous outlet for congested flaps contributed to the favorable survival rate noted in this series. Intermittent phlebotomy was a simple and effective way to relieve venous congestion during the immediate postoperative period. As oscillating avalvular veins hypertrophied and multiplied during the ensuing 24-48 hours, venous circulation improved and the short saphenous vein spontaneously stopped draining. Phlebotomy improved flap survival and was a valuable temporizing measure to prevent critical congestion in flaps adapting to a new circulatory pattern.     

Immunopathogenesis of the antiphospholipid antibody syndrome: an update

The primary antiphospholipid antibody syndrome is characterized clinically by the presence of venous and arterial thrombosis, recurrent fetal loss, and thrombocytopenia. The presence of antiphospholipid antibodies is a central serologic finding in primary antiphospholipid antibody syndrome, and plays a critical role in diagnosis. Contrary to initial reports, it is now widely accepted that these autoantibodies are directed predominantly against two antigens: phospholipid-binding plasma protein beta2-glycoprotein I and prothrombin. The mechanism by which antiphospholipid antibodies cause disease is under vigorous investigation. It is hypothesized that antiphospholipid antibodies induce a procoagulant state by binding to antigens on endothelial cells and trophoblast cell surfaces. Indeed, beta2-glycoprotein I appears to function as a cofactor that facilitates this interaction. The resulting endothelial cell activation is associated with cell-surface expression of adhesion molecules that lead to monocyte adhesion - the first steps in thrombosis. Although the precise mechanism that mediates endothelial cell-platelet interaction have not been fully elucidated, platelet binding to the endothelium appears to be the next phase in thrombosis. Thus, the antiphospholipid antibody may be a triggering or activating factor in placental spiral artery thrombosis and subsequent placental infarction. More recently, a role for annexin V has emerged. Studies suggest that thrombosis in the antiphospholipid syndrome may be due to disruption of the annexin shield by antiphospholipid (and cofactor) antibodies, which results in the increased exposure of trophoblasts and endothelial cells to thrombogenic phospholipids.     

A massive arterial thrombosis of a free anterolateral thigh flap in a patient with antiphospholipid syndrome

The antiphospholipid syndrome is a pathological condition characterized by recurrent thrombotic manifestations in venous and/or arterial vascular systems and by peculiar laboratory findings as anticardiolipin antibodies and/or positive lupus anticoagulant. We present a case of massive pedicle thrombosis of a free anterolateral thigh perforator flap used for tongue reconstruction following hemiglossectomy in a patient with antiphospholipid syndrome, which compelled us to an immediate second reconstruction choice with a radial forearm free flap. This case is an example of how this syndrome, especially if unknown before surgery, can influence the outcome of microsurgical transfer of flaps.     

Free deep inferior epigastric artery perforator flap for reconstruction of soft‐tissue defects in extremities of children

The deep inferior epigastric artery perforator (DIEP) flap has been a valuable tool in breast reconstruction, but seldom in extremity reconstruction. The aim of this report is to present our experience on the use of the DIEP flap for reconstruction of soft‐tissue defects in the extremities of pediatric patients. From January 2007 to February 2011, 22 consecutive free DIEP flap transfers were performed for reconstruction of complex soft‐tissue defects in the extremities of children with a mean age of 5.7 years old (ranging 2–10 years old). The flap design included transverse, oblique, and irregular DIEP flaps, containing one to three perforators in the flap. The flap size ranged from 7 × 4 cm to 18 × 17 cm. Primary donor‐site closure was accomplished in all of patients. The postoperative course was uneventfully in most of cases. The venous congestion was observed in two cases. One case of venous congestion was caused by flap inset with tension. The other case with venous thrombosis ended with partial loss of the flap after salvage procedure. There was one total flap loss due to the arterial thrombosis. The flap survival rate was 95.5%. The mean follow‐up was 12 months (ranging 6–36 months). All reconstructed extremities had satisfactory aesthetic and functional outcomes except two cases undergoing the secondary debulking procedures. The donor sites healed well in all cases without complications. Our experience showed that the free DIEP flap could be an alternative for reconstruction of soft‐tissue defects in the extremities of children. © 2013 Wiley Periodicals, Inc. Microsurgery 33:612–619, 2013.     

Free tissue transfer and deep vein thrombosis

Reconstruction of the post-oncologic defect of the lower limb frequently requires free tissue transfer and these often extensive bone and soft tissue resections can occasionally be compounded by the presence of a deep venous thrombosis (DVT). We describe two patients in whom free tissue transfer was attempted, following extensive resection of a sarcoma in the thigh. Both patients had been diagnosed with DVT prior to surgery and received therapeutic low molecular weight heparin preoperatively. In the first patient, flap failure occurred due to venous congestion initially resulting from poor flow in the reconstructed femoral vein and then thrombosis and failure of the vascular reconstruction. In the second patient the superficial venous system was used for successful microvascular anastomosis leading to survival of the flap. Therefore, patients undergoing lower extremity free tissue transfer who are at high risk of DVT, or when there is a clinical suspicion of DVT, thorough preoperative assessment of the deep and superficial venous system is warranted for reconstruction planning.     

Management of venous access problems before and after intestinal transplantation: case reports

Patients suffering irreversible loss of intestinal function require total parenteral nutrition (TPN). During long-term TPN, catheter infections are a common problem and intestinal transplantation (ITx) is indicated when patients experience loss of venous access. We report two patients with short bowel syndrome--one before and one after ITx. The patient listed for ITx had several catheter infections with septic temperatures. Staphylococcus aureus, detected in blood cultures, was treated with vancomycin. Packing of the central venous line (CVL) with vancomycin was not successful; the CVL was changed. Search for an infectious focus identified a septic femoral head destruction that was treated by incision and implantation of a hip endoprothesis. Thereafter, the patient was free from infection. The second patient underwent ITx on January 2, 2003, and is free from TPN. ITx was complicated by temporary acute renal failure and heparin-induced thrombocytopenia (HIT) syndrome. After compensation of kidney function, the patient required additional saline solution (1 to 2 L/d) to optimize renal perfusion. A CVL was placed in the external iliac vein (EIV) due to previous loss of venous access. At 2 months after ITx, the CVL was infected and the patient was septic. MR scan revealed only one jugular vein to provide vascular access. Therefore, the CVL was changed from the right to the left EIV. Postoperatively, the patient developed thrombosis of right iliac vein and a wound infection that is probably related to the nearby graft ileostomy. At present, the patient is in good condition with a functioning graft. In conclusion, recurrent CVL infections before ITx might reflect other infectious foci that require intensive diagnostic evaluation. After ITx, CVL infection may cause venous thrombosis. Therefore, a single upper venous access should be preserved for optimal care.     

The use of medicinal leeches in the salvage of flaps with venous congestion.

The use of medicinal leeches (Hirudo medicinalis) for the salvage of tissues with venous congestion has been intermittent over the last two centuries. During the last decade, interest in leech therapy has undergone a resurgence. Hirudo's tricuspid bite injects a highly potent anticoagulant. The site usually bleeds for 1 to 2 hours and under special circumstances may bleed for up to 24 hours. This collective series presents four patients in whom immediate postoperative venous congestion threatened the survival of three tissue replants and one latissimus dorsi flap. Two of the replants were completely salvaged; the other two failed due to infection. Hirudo medicinalis is an important adjunct in preventing flap or replant failure secondary to venous congestion, but its use is associated with significant risks.     

Activated protein C resistance due to factor V Leiden, elevated coagulation factor VIII and postoperative deep vein thrombosis in late breast reconstruction with a free TRAM flap: a report of two cases.

Thromboembolic complications can endanger free flap surgery and cause postoperative morbidity and even mortality. The underlying cause of thrombosis is multifactorial; major surgery may trigger hereditary thrombophilic disorders leading to overt thrombotic events. This paper reports two cases with postoperative deep vein thrombosis after late breast reconstruction with a TRAM flap. Both showed APC resistance due to factor V Leiden and elevated coagulation factor VIII. One of the patients also had an event of both arterial and venous anastomotic thrombosis postoperatively.     

Occult antithrombin III deficiency: a potentially lethal complication of the postphlebitic limb

Chronic venous insufficiency is a frequent sequel to lower extremity venous thrombosis. A relatively uncommon, but potentially lethal, cause of the thrombosis is congenital antithrombin III deficiency. Recognition and treatment of this occult deficiency is critical. The following report describes a family treated by the authors for this problem. In one generation of nine siblings, three males had documentation of the disease with functional antithrombin III levels in the range of 50% to 60%. Before evaluation for the deficiency one female sibling died at the age of 20 years as a consequence of a proven pulmonary embolus. Antithrombin III levels in another female sibling, who was free of symptoms, were normal (80% to 120%). Four other siblings who were free of symptoms (one female, three males) refused evaluation. All three men with the deficiency had severe, chronic, bilateral, lower extremity, venous insufficiency manifested by pain, varicosities, edema, pigmentation, and ulceration. Despite chronic warfarin therapy, one experienced recurrent pulmonary embolization with eventual loss of perfusion of the entire right lung. Ascending venography in the symptomatic males with the deficiency revealed evidence of recurrent and diffuse venous thrombosis with partial recanalization. Recurrent lower extremity venous thrombosis consequent to antithrombin III deficiency causes a particularly fulminant postphlebitic syndrome with characteristic venographic findings. Although potentially lethal if unrecognized and treated simply as venous insufficiency, chronic therapy with warfarin offers palliation and prolongs life.     

Der ein- und zweizeitige distal gestielte Suralislappen

Background

The distally pedicled suralis flap is used to cover local defects of the distal lower leg, ankle and hind foot. It is a local flap with no need for microvascular anastomosis, a constant blood supply and ease of elevation. Disadvantages are lack of sensation, donor site morbidity and venous congestion.

Methods and material

This study includes 25 patients. Apart from the defect extent, cause and location, complications were also determined.

Results

The defect site was located in the hind foot in 5 cases and the distal lower leg in 14 cases. In four patients the soft tissue of the lateral calcaneal region and in two cases the sole of the foot were affected. Severe venous congestion, which was only detected in 180° turned flaps, was seen in five cases. In five patients we successfully performed a two-stage flap transposition procedure to avoid venous congestion.

Conclusion

The sural flap remains a reliable solution for soft tissue defects. Under inappropriate circumstances (small pedicle or severe torque of pedicle) venous congestion or even thrombosis is possible. A two-stage approach with conditioning of venous drainage can have a positive effect on these problems.     

Replantation of an amputated nasal tip with open venous drainage

Replantation of small parts often results in failure. The impractical size and the frequent absence of veins suitable for anastomosis, together with venous congestion and thrombosis, are the main problems. A case is described of an amputated nasal tip and successful replantation by means of microsurgical arterial repair and open venous drainage due to absence of suitable veins in the specimen. In cases in which there is no possibility of repairing the venous system, open venous drainage may be an easy and feasible method to prevent venous congestion and replant failure. © 1993 Wiley-Liss Inc.     

Successful Liver Transplantation in a Patient With Budd-Chiari Syndrome Caused by Homozygous Factor V Leiden

Budd-Chiari syndrome (BCS) is a rare form of portal hypertension characterized by hepatic venous outflow obstruction. Although hematologic disorders are the most common cause of this syndrome, to date, 30% of the cases have been classified as idiopathic. Resistance to activated protein C caused by factor V Leiden is the most common cause of thrombophilia; its role in the pathogenesis of BCS is now becoming apparent. We report successful liver transplantation in a patient with BCS caused by homozygous factor V Leiden. The patient was administered standard heparin anticoagulation until activated protein C resistance was normalized by the liver allograft. Liver transplantation corrected the thrombophilic state. The patient has excellent graft function, is not on anticoagulation therapy, and has had no recurrent venous thrombosis at 5 months posttransplantation. Activated protein C resistance caused by the factor V Leiden mutation may be responsible for idiopathic cases of BCS. To avoid unnecessary long-term anticoagulation after liver transplantation, factor V Leiden should be considered as a pathogenic factor in BCS. In addition, because of the high prevalence of factor V Leiden in the world population, cadaveric organ donors with a history of venous thrombosis should be screened for activated protein C resistance lest thrombophilia be transmitted to the recipient. (Liver Transpl 2000;6:654-656.)     

Successful free flap salvage upon venous congestion in bilateral breast reconstruction using a venous cross-over bypass: A case report

Abdominal free flaps such as the muscle sparing transverse rectus abdominis myocutaneous (ms-TRAM) or deep inferior epigastric artery perforator (DIEP) flap represent the gold standard in autologous breast reconstruction. We describe a salvage procedure during bilateral free flap breast reconstruction due to insufficient venous drainage using a venous cross-over bypass. A 54-year-old woman with a thrombosis of the left subclavian port-system in the medical history was elected for simultaneous bilateral breast reconstruction with ms-TRAM and DIEP flaps. Intraoperatively, a venous congestion of the DIEP flap, which was connected to the left cranial internal mammary vessels, appeared. In the absence of sufficient ipsilateral venous recipient vessels, we performed a salvage procedure requiring a 15 cm small saphenous vein graft and presternal subcutaneous tunneling. The flap vein was anastomosed end-to-end with the contralateral caudal internal mammary vein using a coupler system. The postoperative course was uneventful and both flaps survived. We describe the cross-over venous emergency bypass as a useful tool in unexpected venous thrombosis during bilateral free flap breast reconstruction.     

Impact of vasopressors on outcomes in head and neck free tissue transfer

Objectives/Hypothesis: The primary objective of the study was to determine the frequency of intraoperative vasopressor administration among patients undergoing free tissue transfer for head and neck reconstruction, and the secondary objective was to determine the impact of intraoperative vasopressor on free tissue transfer outcomes, including the impact of cumulative vasopressor dose and timing of intraoperative vasopressor administration. Study design/Methods: A retrospective review was performed of all patients undergoing free tissue transfer for head and neck reconstruction at the University Health Network between 2004 to 2008. Results: From 2004 to 2008 inclusive, 485 patients underwent 496 free tissue transfers for head and neck reconstruction. The complete failure rate was 2.2% (11 of 485 patients). The partial failure rate was 1.4%, and the operative take‐back rate for venous congestion or arterial thrombosis was 1.6%. This gave a total major flap complication rate of 5.2%, which was used as the primary free tissue transfer outcome measure. Of the 485 patients who underwent free tissue transfer, 320 (66.0%) received intraoperative vasopressor. Of these patients, the majority (97.5%) received phenylephrine and/or ephedrine. There was no significant relationship between receiving intraoperative vasopressor and major free flap complications, which were defined as complete failure, partial failure, or operative take‐back for venous congestion or arterial thrombosis. Conclusion: Intraoperative vasopressors are used routinely in free tissue transfer for the reconstruction of head and neck defects. The use of intraoperative vasopressors does not appear to adversely affect free tissue transfer outcomes. © 2011 Wiley Periodicals, Inc. Microsurgery, 2012.     

Salvage operations of free tissue transfer following internal jugular venous thrombosis: a review of 4 cases

The internal jugular vein (IJV) is used as the optimal recipient for free-tissue transfer in reconstruction following modified radical neck dissection. Some reports documented rare cases of flap compromise following IJV thrombosis, but large sample studies are few. We present cases of emergent exploration and an analysis of factors to improve salvage rates of compromise due to IJV thrombosis. From a survey of 756 patients, four developed congestion due to IJV thrombosis and returned to the operating room. A restrospective analysis was made from the case records.This represents a rate of 0.5% for the entire series. Three flaps survived,and one failed. Detection of compromise ranged from 7-25 h postoperatively. All four IJVs recovered to provide adequate drainage after thrombectomy.While flap compromise following IJV thrombosis is rare, careful observation and early exploration are crucial for salvage, as in other microvascular venous crises.     

The venae comitantes clipping test for the evaluation of the venous drainage of the radial forearm free flap

Risks of failure of the radial forearm free flap (FRFF) are mainly related to venous congestion. Two different venous drainage system have been described for the FRFF, but the choice of the best one is still controversial. The superficial systems have a larger diameter and a thicker wall veins which makes them easier to anastomose. The deep system provides most part of the venous outflow if the caliber of the venae comitantes (VCs) is adequate. We propose an intra‐operative method to evaluate the FRFF venous drainage: the VCs clipping test. The test has been used in the choice of the vein to anastomose in 12 consecutive patients with oral cavity post oncological defects reconstructed with the FRFF. The cephalic vein was included in the flap; the VCs were individually clipped with small liga‐clips and divided with the radial artery still patent. The flap was kept with arterial inflow and superficial venous outflow till the recipient site was ready. If there were no signs of venous stasis, the VCs were kept clipped and the cephalic vein anastomosis was made. If clinical signs of venous stasis were revealed, the largest of the VCs was anastomosed to a vein of adequate caliber in the neck. No signs of flap venous congestion were observed in the postoperative period. No flap necrosis occurred. In this small series of patients the venae comitantes clipping test showed to be an easy, reliable and reproducible method to assess intra‐operatively which vein to anastomose. © 2015 Wiley Periodicals, Inc. Microsurgery 36:647–650, 2016.     

Augmentation of venous drainage by a venous anastomosis for pedicled flaps

Recently several studies have addressed the venous problem and confirmed that venous ischemia is more injurious to tissue viability than arterial ischemia of equivalent duration. There are different methods of managing venous-compromised pedicled flaps. Between June 1996 and November 2003, our center treated two submental, five Becker, nine posterior interosseous, three distally based sural, and three colon pedicled flaps (22 flaps in total), which had venous congestion either at the time of flap elevation or immediately after inset of the flap. These cases of venous congestion were managed with an immediate additional venous anastamosis. After vein anastomosis, venous congestion reduced gradually, then improved, and finally disappeared completely in the postoperative follow-up days with all flaps surviving in their entirety. Reexploration was not required for the microsurgical venous anastomosis. In conclusion, flap necrosis resulting from venous congestion causes prolonged hospitalization, multiple debridements, and additional procedures to cover the exposed structures. Additional vein anastomosis, which is a simple, rapid, and reliable auxiliary procedure, may increase complete flap survival and lead to successful end results, both functional and cosmetic.     

Venous congestion as a central mechanism of radiculopathies

Compression of roots/nerves can disrupt some of their functions, but does not necessarily cause pain. This is illustrated by the frequency of nearly asymptomatic spinal stenosis or disc herniations. In fact, pain of radiculopathies (and nerve entrapments) may mostly be the consequence of intraneural oedema induced by microscopical venous stasis around roots/spinal ganglia (or nerves) not or poorly shown by imaging. This narrative review first lists arguments for a role of congestion of vasa-nervorum in the pathophysiology of radiculopathies, including those induced by disc herniation and spinal stenosis, but also other sources of overpressures in spinal venous plexuses (pregnancy, vena cava atresia and thrombosis, portal hypertension, epidural varices, arterio-venous fistula, vertebral hemangioma or hemangioblastoma). It also details sources of venous congestion around nerves outside the spine, from pelvis (May-Thurner syndrome, Nut-cracker syndrome) to buttocks (superior and inferior gluteal veins), and even thighs and legs. A better recognition of a preeminent role of venous congestion in radiculopathies, plexopathies, and nerve entrapments, should have major consequences: (i) discard the dogma that compression is mandatory to induce root/nerve suffering, since root/nerve adherences in two locations can impair blood flow in vasa-nervorum through root/nerve stretching; (ii) implementation of sensitive techniques to visualise impingement of blood flow around or within roots and nerves; (iii) better prevention of roots/nerves adherence, or arachnoiditis induced by extravascular fibrin deposition secondary to venous stasis.; (iv) optimizing treatments dampening clot formation and/or extravascular fibrin leakage in the intradural/peridural spaces, or around roots/nerves, like guided injection of tissue plasminogen activator.