Inferior vena cava filter

Inferior vena cava filter - Gunther Tulip.[1]

An inferior vena cava filter (IVC filter) is a type of vascular filter, a medical device that is implanted by interventional radiologists or vascular surgeons into the inferior vena cava to presumably prevent life-threatening pulmonary emboli (PEs).[2] Their effectiveness and safety profile is not well established, and in general, they are only recommended in some high-risk scenarios.[2] They are not intended to be a replacement for medical (drug-based) management of venous thromboembolism (VTE). However, in cases where patients are at high risk of developing a clinically significant PE and cannot be sufficiently anticoagulated, placement of an IVC filter may be recommended.[3]

To date, there has been only one randomized controlled trial completed on IVC filters. This study found that IVC filters reduced the incidence of PE but increased the incidence of deep vein thrombosis (DVT). All patients were on anticoagulation drugs during the study.[4] Results from the PREPIC study and other studies which have shown many long-term complications of IVC filters led to the introduction of retrievable IVC filters. The first retrievable IVC filters were approved by FDA in 2003 and 2004.[5]

In 2012, the American College of Chest Physicians recommended IVC filters for those with contraindications to anticoagulation who either have acute PE or acute proximal (above the knee) deep vein thrombosis (DVT).[6][7]

Medical uses

Inferior vena cava filter as seen on plain X ray of the abdomen

While the ability to retrieve a filter does exist for many models, it cannot be guaranteed that all cases of filter placement will allow for, or be indicated for retrieval. Thus, the requirements and indications for permanent placement of filters is used to decide on when to use both permanent and temporary IVC filters.[8]

Long-term risk factors must be considered as well, to include life expectancy of more than six months following insertion, and the ability of the patient to comply with anticoagulation therapy.[3] The decision to use a filter that is temporary vs permanent basically is tied to the expected duration of time that protection is needed to prevent pulmonary emboli from passing to the heart and lungs. One such guideline is outlined below:[8]

Indication categories

While many studies have been done on the efficacy of Vena Cava filters, there still have not been any major studies done on the actual placement and removal of the filters regarding standard guidelines. Which is why the Society of Interventional Radiology created a multidisciplinary panel that developed the following guidelines to see if someone qualifies for implantation:

Absolute indications

These are patients that should strongly consider having IVC filter placement, as they are at greatest risk of pulmonary embolus.

Relative indications

This is a maybe category; normally it represents patients who could benefit from an IVC filter, but may be just fine without one as well.

Prophylactic indications

These are usually very controversial reasons to do an IVC filter, and most radiologists and doctors generally will not recommend an IVC filter if other options are available instead.

Other indications

Indications for removing IVC filter

There is no current published data confirming the benefit of removing an IVC. Because of this, the Society of Interventional Radiology created a multidisciplinary panel that developed the following guidelines to see if someone qualifies for removal:[3]

Anticoagulation

In those with initial acute proximal DVT or acute PE who had IVC filters placed instead of anticoagulation, and who have their risk of bleeding resolve, the American College of Chest Physicians suggested, in 2012, that they receive a standard course of anticoagulation.[10][11] While IVC filters are associated with a long term risk of DVT,[2] they are not, alone, reason enough to maintain extended anticoagulation.[12]

Side effects

The main function of a vena cava filter is to prevent death from massive pulmonary emboli. Long-term clinical follow-up studies have shown that this is accomplished in 96% of cases having a standard stainless-steel Greenfield filter.[13]

Abdominal radiograph shows that one of the legs (arrows) of the IVC filter is pointed away from the expected IVC lumen.
Axial CT image confirms that one of the legs (arrow) of the IVC filter has migrated out of the IVC wall into an adjacent tissue.

FDA communication

In August, 2010, the FDA released an Initial Communication on the Risk and Adverse events associated with Long Term use of an inferior vena cava filter.[14] Over a period of about 5 years, they identify 921 events. While not the majority of cases, that number still represents a statistical significance of the use of long-term IVCs.

Of these IVC filter side effects, 328 involved device migration, 146 involved embolizations after detachment of device components, 70 involved perforation of the IVC, and 56 involved filter fracture. Much of the medical community believes that this large number of adverse events is related to the heart filter remaining in place for longer than necessary.

Common issues relating to failure, to include death (the other 4% of cases) include:

Less common adverse reactions

While these side effects are not common (less than 10-20% of patients), many do report issues stemming from the placement and complication of the IVC while inside of the body.[15]

Numerous small published articles and case studies report describe similar issues to the above. Most notably:

Even though the cases above are the exception, and not the rule, most radiologists object to doing prophylactic filter insertions in patients who do not have thromboembolic diseases.[27] For the most part, whenever possible, interventional radiologists would rather start the patient on anticoagulants than use an IVC, even if requested or referred via a doctor.[28]

MRI

While most IVC filters are made of non-ferromagnetic materials, there are a few types that are weakly ferromagnetic. Accordingly, IVC filters fall under the MRI Safe and MRI Conditional categories depending mostly on type of material used during construction. Rarely will one find an MRI Not Safe IVC filter, as most of the steel, and other ferromagnetic material devices have been discontinued via the FDA.

IVC filters are attached to the vena cava via hooks on their ends. Some are compression springs, which compress outward onto the side wall of the vena cava; however, they still have small hooks that retain their location. These hooks aid in the anchoring and healing process, as they allow the tissues to 'ingrow' around them, securing the IVC in place. It is unlikely, then, after 4 to 6 weeks of healing, that an MRI of 1.5 tesla, up to 3 tesla, will cause any level of dislodging to occur for the IVC filter.

Studies of MR examination of both animals and humans, with implanted IVC filters, have not reported complications or symptomatic filter displacement.[29][30][31][32][33][34]

Several animal studies have even used "real-time" MR for the placement of IVC filters to check for rotation, sheering, and other artifacts.[35][36]

As part of the 'routing' survey for MRI studies, patients who have IVC filters will often need verification from the doctor, or medical records, to state that the IVC is safe for the MRI. Most patients with weakly or non-safe ferromagnetic implants will be given a card, which they keep on their person at all time, that can help isolate if it is safe to do an MRI.

For patients who have been denied MRI scans for safety reasons, doctors usually recommend the CT scan with contrast as an alternative.

Labeling and recommendations

Most IVC filters that have been tested have been labeled as “MRi safe”; the remainder of IVC filters that have been tested are “MR conditional.” Patients who have been treated with nonferromagnetic IVC filters can undergo MR examination any time after filter implantation. In patients who have been treated with a weakly ferromagnetic IVC filter (Gianturco bird nest IVC filter [Cook], stainless steel Greenfield vena cava filter [Boston Scientific]), it is advised that the patient wait at least six weeks before undergoing an MR examination (because these older devices initially may not be anchored as firmly in place as other devices discussed in the present context), unless there is a strong clinical indication to perform the MR examination sooner after implantation, and as long as there is no reason to suspect that the device is not positioned properly or that it is not firmly in place. Most studies of IVC filters have generally been conducted at 1.5 Tesla or less, although many IVC filters have now been evaluated at 3 tesla and deemed acceptable for MR examination.[37][38]

Placement

IVC filters are placed endovascularly, meaning that they are inserted via the blood vessels. Historically, IVC filters were placed surgically, but with modern filters that can be compressed into much thinner catheters, access to the venous system can be obtained via the femoral vein (the large vein in the groin), the internal jugular vein (the large vein in the neck) or the arm veins with one design. Choice of route depends mainly on the number and location of any blood clot within the venous system. To place the filter, a catheter is guided into the IVC using fluoroscopic guidance, then the filter is pushed through the catheter and deployed into the desired location, usually just below the junction of the IVC and the lowest renal vein.[39]

Review of prior cross-sectional imaging or a venogram of the IVC is performed before deploying the filter to assess for potential anatomic variations, thrombi within the IVC, or areas of stenoses, as well as to estimate the diameter of the IVC. Rarely, ultrasound-guided placement is preferred in the setting of contrast allergy, renal insufficiency, and when patient immobility is desired. The size of the IVC may affect which filter is deployed, as some (such as the Birds Nest) are approved to accommodate larger cavae. There are situations where the filter is placed above the renal veins (e.g. pregnant patients or women of childbearing age, renal or gonadal vein thromboses, etc.). Also, if there is duplication of the IVC, the filter is placed above the confluence of the two IVCs [40] or a filter can be placed within each IVC.[41]

Retrieval

The concept of a removable IVC filter was first thought up in 1967.[42] However, it was not until 2003 and 2004 that the United States Food and Drug Administration drafted regulations and requirements on creating devices that were fit for retrieval from the vena cava [43] And still, even while the FDA did approve of the models and designs, it wasn't until 2005 that the Society of Interventional Radiology (SIR) convened a multidisciplinary conference to address the clinical application of nonpermanent vena cava filters.

Retrievable filters are fitted with a device (varying from model to model) that allows them to be easily snared and pulled back into a catheter and removed from the body, often through the jugular vein. Prior to 2004, filters that had been in the IVC for less than three weeks were considered suitable to attempt retrieval, as filters that have been in place longer might have been overgrown by cells from the IVC wall and there was an increased risk of IVC injury if the filter is dislodged. Newer designs, and developments in techniques mean that some filters can now be left in for prolonged periods and retrievals after a year are now being reported.[44] This would include the ALN, Bard G2 and G2x, Option, Tulip and Celect filters.

It is important to note that the clinical exam prior to the removal of the filter is vital in understanding both the risk and pathophysiological effects removing the filter will have on the patient. Doctors and medical professionals must consider several key factors (see Indications for removing IVC filters).

History

The first IVC filter was created by Kazi Mobin-Uddin, MD.[45][46][47][48] The Mobin-Uddin filter was later replaced by the Greenfield filter developed by Lazar Greenfield which had a lower rate of filter related complications.[47]

References

  1. ↑ Gunther Tulip IVC Filter. Cook Medical. URL: http://www.cookmedical.com/di/di_front/images/dif_bu1.jpg. Accessed on: November 24, 2007.
  2. 1 2 3 Young T, Tang H, Hughes R (2010). Young, Tim, ed. "Vena caval filters for the prevention of pulmonary embolism". Cochrane Database of Systematic Reviews (2): CD006212. doi:10.1002/14651858.CD006212.pub4. PMID 20166079.
  3. 1 2 3 Kaufman, JA; Kinney TB; Streiff MB; et al. (March 2006). "Guidelines for the use of retrievable and convertible vena cava filters: report from the Society of Interventional Radiology multidisciplinary consensus conference". Journal of Vascular Interventional Radiology. 3. 17: 449–459. doi:10.1097/01.rvi.0000203418-39769.0d.
  4. ↑ PREPIC Study, Group (19 July 2005). "Eight-year follow-up of patients with permanent vena cava filters in the prevention of pulmonary embolism: the PREPIC (Prevention du Risque d'Embolie Pulmonaire par Interruption Cave) randomized study.". Circulation. 112 (3): 416–22. doi:10.1161/circulationaha.104.512834. PMID 16009794.
  5. ↑ Kaufman, JA; Kinney, TB; Streiff, MB; Sing, RF; Proctor, MC; Becker, D; Cipolle, M; Comerota, AJ; Millward, SF; Rogers, FB; Sacks, D; Venbrux, AC (NaN). "Guidelines for the use of retrievable and convertible vena cava filters: report from the Society of Interventional Radiology multidisciplinary consensus conference.". Surgery for Obesity and Related Diseases. 2 (2): 200–12. doi:10.1016/j.soard.2006.03.009. PMID 16925346. Check date values in: |date= (help)
  6. ↑ Guyatt et al. 2012, p. 21S: 2.13.2.
  7. ↑ Guyatt et al. 2012, p. 24S: 5.9.2.
  8. 1 2 Kaufman, JA. "Guidelines for the use of retrievable vena cava filters". Touch Briefings. Retrieved 20 December 2010.
  9. ↑ Baumann, DS. "IVC filter placement in bariatric patients". Endovsc Today. Retrieved 2005. Check date values in: |access-date= (help)
  10. ↑ Guyatt et al. 2012, p. 21S: 2.13.3.
  11. ↑ Guyatt et al. 2012, p. 24S: 5.9.3.
  12. ↑ Guyatt et al. 2012, p. 21S: 2.13.
  13. ↑ Greenfield, LJ; Peyton R; Crute S; Barnes R (1981). "Greenfield vena caval filter experience: late results in 156 patients.". Arch Surgical. 116: 1451–1456. doi:10.1001/archsurg.1981.01380230065010.
  14. ↑ Food and Drug Administration. "Inferior Vena Cava (IVC) Filters: initial Communication: Risk of Adverse Events with Long Term Usage". United States Food and Drug Administration. Retrieved 2015-03-15.
  15. ↑ Ferris, EJ; McCowen TC; Carver DK; McFarland DR (1993). "Percutaneous inferior vena cava filters: follow-up of seven designs in 320 patients". Radiology. 188: 851–856. doi:10.1148/radiology.188.3.8351361.
  16. ↑ Taheri, SA; Kulaylat MN; Johnson E; Hoover E (1992). "A complication of the Greenfield filter: fracture and distal migration of two struts, a case report". J Vascular Surgery. 16: 96–99. doi:10.1016/0741-5214(92)90424-7.
  17. ↑ Kalavakunta, Jagadeesh K.; Thomas, Christopher S.; Gupta, Vishal (2009-11-01). "A needle through the heart: rare complication of inferior vena caval filters". The Journal of Invasive Cardiology. 21 (11): E221–223. ISSN 1557-2501. PMID 19901424.
  18. ↑ Appleberg, M; Crozier JA (1991). "Duodenal penetration by a Greenfield caval filter". Aust N Z J Surgical. 61: 957–960. doi:10.1111/j.1445-2197.1991.tb00017.x.
  19. ↑ Howerton, RM; Watkins M; Feldman L (1991). "Late arterial hemorrage secondary to a Greenfield filter requiring operative intervention". Surgery. 109: 265–268.
  20. ↑ Lahey, SJ; Meyer LP; Karchmer AW; et al. (1991). "Misplaced caval filter and subsequent pericardial tamponade". Ann Thorac Surgery. 51: 299–300. doi:10.1016/0003-4975(91)90805-z.
  21. ↑ Puram, B; Maley TJ; White NM; Rotman HH; Miller G (1990). "Acute myocardial infarction resulting from the migration of a Greenfield filter". Chest. 98: 1510–1511. doi:10.1378/chest.98.6.1510.
  22. ↑ Bach, JR; Zaneuski R; Lee H (1990). "Cardiac arrhythmias from a malpositioned Greenfield filter in a traumatic quadriplegic". American Journal of Physical Medicine & Rehabilitation. 69: 251–253. doi:10.1097/00002060-199010000-00005.
  23. ↑ Villard, J; Detry L; Clermont A; Pinet F (1987). "Eight cases of Greenfield filters in the right heart cavities: their surgical treatment". Ann Radiologic. 30: 102–104.
  24. ↑ Poillaud, C; Paillard F; Biron Y; Gouffault J (1988). "Proximal migration of a caval filter: apropos of a case". Annual Cardiological Angeiol (Paris). 37: 129–131.
  25. ↑ LaPlante, JS; Contractor FM; Kiproff PM; Khoury MB (1993). "Migration of the Simon nitinol vena cava filter to the chest". AJR. 160: 385–386. doi:10.2214/ajr.160.2.8424358.
  26. ↑ Kupferschmid, JP; Dickson CS; Townsend RN; Diamond DL (1992). "Small-bowel obstruction from an extruded Greenfield filter strut: an unusual late complication". Journal of Vascular Surgery. 16: 113–115. doi:10.1016/0741-5214(92)90427-a.
  27. ↑ Emerson, RH, Jr; Cross R; Head WC (1991). "Prophylactic and early therapeutic use of the Greenfield filter in hip and knee joint arthroplasty". Journal of Arthroplasty. 6: 129–135. doi:10.1016/s0883-5403(11)80007-0.
  28. ↑ Olin, JW; Young JR; Graor RA; Ruschhaupt WF; Beven EG; Bay JW (1987). "Treatment of deep-vein thrombosis and pulmonary emboli in patients with primary and metastatic brain tumors: anticoagulants or inferior vena cava filters?". Archives of Internal Medicine. 147: 2177–2179. doi:10.1001/archinte.147.12.2177.
  29. ↑ Watanabe AT, Teitelbaum GP, Gomes AS, Roehm JO Jr (1990). "MR imaging of the bird's nest filter". Radiology. 177: 578–579. doi:10.1148/radiology.177.2.2217801.
  30. ↑ Kiproff PM, Deeb ZL, Contractor FM, Khoury MB (1991). "Magnetic resonance characteristics of the LGM vena cava filter: technical note". Cardiovasc Intervent Radiol. 14: 254–255. doi:10.1007/bf02578474.
  31. ↑ Kim D, Edelman RR, Margolin CJ, Porter DH, McArdle CR, Schlam BW, Gianturco LE, Siegel JB, Simon M (1992). "The Simon nitinol filter: evaluation by MR and ultrasound". Angiology. 43: 541–548. doi:10.1177/000331979204300701.
  32. ↑ Grassi CJ, Matsumoto AH, Teitelbaum GP (1992). "Vena caval occlusion after Simon nitinol filter placement: identification with MR imaging in patients with malignancy". J Vasc Interv Radiol. 3: 535–539. doi:10.1016/s1051-0443(92)72008-9.
  33. ↑ Bartels LW, Bakker CJ, Viergever MA (2002). "Improved lumen visualization in metallic vascular implants by reducing RF artifacts". Magn Reson Med. 47: 171–180. doi:10.1002/mrm.10004.
  34. ↑ Liebman CE, Messersmith RN, Levin DN, Lu CT (1988). "MR imaging of inferior vena caval filters: safety and artifacts". AJR Am J Roentgenol. 150: 1174–1176. doi:10.2214/ajr.150.5.1174.
  35. ↑ Bucker A, Neuerburg JM, Adam GB, Glowinski A, Schaeffter T, Rasche V, van Vaals JJ, Günther RW (2001). "Real-time MR guidance for inferior vena cava filter placement in an animal model". J Vasc Interv Radiol. 12: 753–756. doi:10.1016/s1051-0443(07)61448-1.
  36. ↑ Frahm C, Gehl HB, Lorch H, Zwaan M, Drobnitzky M, Laub GA, Weiss HD (1998). "MR-guided placement of a temporary vena cava filter: technique and feasibility". J Magn Reson Imaging. 8: 105–109. doi:10.1002/jmri.1880080121.
  37. ↑ MRI safety. Institute for Magnetic Resonance Safety, Education, and Research Web site. Available at: http://www.MRIsafety.com. Accessed June 19, 2006.
  38. ↑ Shellock FG. Reference Manual for Magnetic Resonance Safety, Implants, and Devices: 2006 Edition. Los Angeles, Calif: Biomedical Research Publishing Group; 2006.
  39. ↑ Kinney, Thomas; Cameron, S; Sass, P; Zoller, M; Wigler, M (1 September 2006). "Inferior Vena Cava Filters". Seminars in Interventional Radiology. 23 (3): 230–239. doi:10.1055/s-2006-948760. PMC 3036373Freely accessible. PMID 21326769.
  40. ↑ Mano, Tatsumi T; Sakai H; et al. (2004). "A case of deep venous thrombosis with a double inferior vena cava effectively treated by suprarenal filter implantation.". pn Heart. 45: 1063–1069. doi:10.1536/jhj.45.1063.
  41. ↑ Sartori, MT; Zampieri P; Andres AL; Prandoni P; Motta R; Miotto D (2006). "Double vena cava filter insertion in congenital duplicated inferior vena cava: a case report and literature review.". Haematologica. 6. 91 (ECR30).
  42. ↑ Williams R, Schenk W (1970). "A removable intracaval filter for prevention of pulmonary embolism: early experience with the use of the Eichelter catheter in patients". Surgery. 68: 999–1008.
  43. ↑ Kaufman J (2004). "Retrievable vena cava filters". Tech Vasc Interv Radiol. 7: 96–104.
  44. ↑ McKenzie S, et al. "An Australian experience of retrievable inferior vena cava filters in patients with increased risk of thromboembolic disease". International angiology. 29 (1): 53–57.
  45. ↑ Mobin-Uddin K, Callard GM, Bolooki H, Rubinson R, Michie D, Jude JR (1972). "Transvenous caval interruption with umbrella filter." (fee required). New England Journal of Medicine. 286: 55–8. doi:10.1056/NEJM197201132860202. PMID 5006878.
  46. ↑ Cain, PG (1995). "Comment on "Treatment of venous disease — The innovators". Journal of Vascular Surgery. 22: 341–2. doi:10.1016/s0741-5214(95)70156-7.
  47. 1 2 Galanaud JP, Laroche JP, Righini M (2013). "The history and historical treatments of deep vein thrombosis". Journal of Thrombosis and Haemostasis. 11: 402–11. doi:10.1111/jth.12127.
  48. ↑ Hussain, SA (1999). "Kazi Mobin-Uddin, 1930-1999". Journal of Vascular Surgery. 32: 406–7. doi:10.1067/mva.2000.108645.

Cited literature

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