Use of inferior vena cava (IVC) filters is linked to a range of side effects, some of which are life-threatening. In general, researchers and the U.S. Food and Drug Administration recommend that the filters be removed as soon as they are not needed because the longer they remain in the body, the higher the chances of complications.
If you've suffered from a fractured filter, device migration, perforation or other complication, you may be eligible for compensation.
Inferior vena cava (IVC) filters are devices that are placed in the largest vein in the body with the intention of trapping clots before they reach the lungs. Since the early 2000s, retrievable IVC filters have been an option in addition to permanent filters.
The FDA has received reports of adverse events linked to the filters, including filter fracture, movement of the filter or fragments to the heart or lungs, perforation, and trouble removing the IVC.
Researchers say that advancements in filter design have reduced the number of complications, but because many complications involve no symptoms, it’s not known exactly how prevalent they are.
Many patients experience no symptoms when complications arise, and researchers have suggested monitoring to ensure that the filters remain in place and are doing what they’re supposed to. In some instances, the side effects can be painful and dangerous.
“It’s like a knife being pushed into your stomach,” one patient told a television reporter about the experience of having her IVCs filter twist and puncture the walls of the artery where it had been implanted three years earlier.
Clare Austin of South Florida said surgeons had to make, approximately, a 10-inch incision in her belly to remove the filter.
“When I woke up I was in horrendous pain. A few days later when I finally saw the incision that was unbelievable”
As a general rule, IVC filter complications are grouped into three categories: those that occur during placement, those problems with the filters that happen after placement, and complications during removal or retrieval of the filter.
To place the filter, a doctor will usually use a catheter inserted through the skin into a large vein in the neck or thigh and thread it to the inferior vena cava in the abdomen. The filter is threaded through the catheter into the vein using image guidance, including X-ray and ultrasound and a contrast agent, or a substance introduced into the body to help the medical professionals see. This procedure is referred to as percutaneous.
The rate of complications from this procedure has been reported to range from 4 to 11 percent.
Other possible complications of the procedure include the guide wire penetrating the vein, bleeding or infection of the insertion site, kidney dysfunction caused by the contrast agent, blood clotting at the insertion site and a condition called arteriovenous fistula (AVF), which is a rare complication involving an abnormal connection between an artery and a vein. The reported incidence of this complication is 0.02 percent.
The rate of bleeding at the access site is estimated between 6 and 15 percent, but significant bleeding that would require a transfusion or surgery is rare. Blood clots at the site range from 2 to 35 percent, with higher rates in patients with blood that tends to clot too much. The studies that found higher rates used ultrasound and found clotting in patients without symptoms.
In a few cases, medical professionals have incorrectly oriented the filter. In one instance, a filter was put in backwards and had to be retrieved.
Sometimes, filters are placed surgically, rather than percutaneously – a medical procedure performed through the skin rather than an open approach with exposed organs or tissue. When this is done, filters are more likely to be placed in the wrong spot, or misplaced.
Other complications relate to problems with the filter itself. For example, the filter might fail to completely open, it may tilt or be placed in the wrong location. The filter may also fracture or migrate to another location in the body.
Medical professionals define tilt as occurring when the filter is angled at greater than 15 degrees. When this happens, patients are at greater risk of pulmonary embolism. This has been found by researchers most commonly with particular filters: Recovery/G2 made by Bard Peripheral Vascular and Günther-Tulip from Fort Wayne Metals.
Researchers disagree on the best way to treat patients whose filters have tilted, with options including retrieval, adjustment and placement of a second filter. The first option can lead to other problems, such as the filter becoming embedded or perforating the vein. Trying to adjust the placement is not recommended by manufacturers, and the placement of a second filter isn’t supported in research literature. Another option is for the doctor to closely monitor the patient and filter.
Medical professionals consider a filter to have significantly migrated if it moves 2 centimeters or more from the initial location. This can happen for several reasons, including the filter being too small and the patient having a catheter. One filter, the Mobin-Uddin, was discontinued in 1986 after being associated with high rates of migration, resulting in several deaths.
Newer filters have much lower migration levels, estimated at less than 1 percent. Researchers say 90 percent of migration incidents happened more than 30 days after placement.
Migration has been found twice as often with permanent filters as with retrievable filters. When migration into the cardiopulmonary system happens, it can be fatal, and it requires immediate medical intervention, including possible open-heart surgery.
Sometimes the filter is defective and fails to open completely. This also can happen for other reasons, including an error on the part of the doctor who places the filter. This failure to open happens between 0.7 percent to 13.9 percent of the time, and with one type of filter — the titanium Greenfield filter — can happen in as many as 71 percent of cases. When this happens, the filter’s performance can be decreased by as much as 80 percent, especially for catching smaller clots.
Another possible complication is called caval thrombosis, or blood clotting in the vena cava. Rates have been estimated to range between 2 percent to 30 percent. When there are symptoms, they include pain and swelling in the lower extremities. The cause isn’t known, but can be related to the fact that patients already have higher risk for clotting, as well as the increased clotting from the presence of a foreign body in the vena cava. It may also represent clots that have been captured by the filter, as intended.
Filter fracture is a late complication, usually seen in filters that have been in place for more than a year. Researchers suggest that this may mean that the structure of the filter wears down over time. Consequently, promptly removing retrievable filters after they are no longer needed can prevent this complication from happening.
In one study, researchers looked at 80 patients who had two particular brands of filters placed in them between 2004 and 2009, the Bard Recovery and the Bard G2 filters. A total of 13, or 16 percent of the patients had at least one of their filters’ struts fracture. In five cases, the strut had lodged in the patients’ hearts. Three of the patients had life-threatening conditions.
Sometimes the filter perforates the vein. This happens more often with retrievable filters that have been left in place longer than intended. Serious, but rare cases, have involved perforation of the duodenum, the aorta, and the renal pelvis.
If a patient with a filter experiences non-specific abdominal or back pain, the physician should suspect possible perforation.
Pain experienced by patients with an IVC filter is often related to complications of the device that may be defective or malfunctioning. Some complications of an IVC filter that can cause severe pain include IVC perforation, embolization or a blocked filter.
IVC filters can also become embedded in or perforate the IVC wall. But because blood vessels do not contain nerve endings, it’s unlikely that patients will experience any pain associated to complications directly affecting the vein and they will consequently be unaware of a problem.
However, once an IVC filter has pierced all the way through the vessel, or if it breaks apart moving through the bloodstream, it can affect other areas of the body resulting in pain.
Pain associated with IVC complications can affect the abdomen, back, heart or legs.
Abdominal or back pain associated with an IVC filter is typically due to perforation of the blood vessel and migration of the device or parts of the device to other areas of the body within the abdominal region or the spine.
Perforation and migration account for about 22 percent and 20 percent of all reported complications, respectively.
A case report in 2016, involved a 49-year-old woman who suffered from severe abdominal pain and previous back pain. Her other symptoms included nausea, anorexia, non-bloody vomiting and loose stools (diarrhea). A CT scan showed migration of all four struts of her IVC filter.
The struts had penetrated a nearby blood vessel (the aorta), part of the spine, muscle located adjacent to the lower spine and pelvic region, and tissues located between various organs and the abdominal wall.
Open surgery was needed to remove the IVC filter and repair the patient’s injuries.
Leg pain associated with IVC filters is often due to a blockage in the device. When several clots become trapped in the filter, clot formation down the IVC can cause swelling in the legs, which can be painful.
Other signs and symptoms of a problem might include darkening of the skin and ulceration in the lower extremities.
An issue with the IVC filter causing leg pain might be difficult for patients to identify apart from the underlying condition of deep vein thrombosis (DVT) for which they are being treated. Any leg pain that is severe or worsens suddenly or over time, should be evaluated by a doctor.
When an IVC filter has a strut that breaks loose and makes its’ way through the bloodstream to the heart or lungs, called embolization, patients can suffer from severe chest pain similar to a heart attack.
Adverse event reports submitted to the U.S Food and Drug Administration (FDA) between 2005 and 2010, included 146 reports of embolization out of 921 total reports.
Embolization of IVC filters to the heart and lungs can have serious and sometimes deadly consequences. Signs and symptoms of the serious condition might include coughing up blood, heart attack, swelling in the legs, difficulty breathing or shortness of breath, and loss of consciousness.
Open heart surgery may be needed to repair damage caused by IVC filter embolization to the heart.
Patients with IVC filters have a risk of deep venous thrombosis (blood clot in lower-body vein). The risk doubles two years after a filter is placed. The incidence of this complication has been estimated to be as high as 43 percent.
Retrieving the filter comes with possible problems, including fracturing the filter and injuring the inferior vena cava, tearing the wall of the blood vessel or hemorrhage.
Despite the possibility of complications from the removal procedure, experts still recommend removing the IVC filter as soon as it’s no longer needed because the risks of leaving it in place too long outweigh the risks of removing it.
In 2010, the U.S. Food and Drug Administration (FDA) issued its first safety communication regarding IVC filters. The agency recommended removal of the IVC filter once protection from pulmonary embolism (PE) was no longer needed.
The FDA’s safety advisement and recommendation came after receiving and reviewing more than 900 adverse event reports related to the anticoagulation device over a five-year period.
Adverse events reported included device migration, embolization (passage of the device or parts of the device to the heart or lungs), perforation of the IVC and organs, and filter fractures.
These events often occurred long after the patient’s risk of pulmonary embolism (PE) had subsided, yet the filter remained in the body.
In 2014, the FDA issued an updated safety communication regarding the use and removal of IVC filters.
The notice contained no new safety concerns.
Instead, in its’ updated safety communication, the FDA reported that after a patient’s risk for pulmonary embolism (PE) has passed, removal of an IVC filter is favorable between 29 and 54 days after implantation.
A mathematical model developed by the federal agency using publicly available data from medical literature, suggested the time period during which the risk of having an IVC filter begins to outweigh its’ benefits when PE prevention is no longer needed.
In reaching its conclusion, the FDA concluded that IVC filter complications may be avoided if the anticoagulation device is promptly removed after the risk for PE has subsided.
The FDA, in its’ notice, also required the collection of additional clinical data for IVC filters currently marketed in the U.S. The agency believes these studies could answer safety questions that still exist for both permanent and retrievable filters.
In 2015, the FDA issued a warning letter to C.R. Bard, the manufacturer of several IVC filters and the Recovery Cone Removal System. The agency noted that the removal system was never cleared and therefore, there was presumably no approved method for removing the manufacturer’s IVC filters.
Bard was also admonished by the regulatory agency for not following good manufacturing practices in the manufacture, packaging and storage of its IVC filters, and for not establishing and maintaining appropriate procedures to receive, review and evaluate complaints related to its anticoagulation devices.
The FDA further noted that the company failed to report information about defects associated with its IVC filters that could possibly result in serious injury or death.
Prior to the 2010 FDA advisory, IVC filter placements had increased more than 22 percent since 2005.
This increase was followed by an even greater decrease in the rate of IVC filter placements after the issuance of the agency’s safety warning. From 2010 to 2014, IVC filter use declined by 29 percent.
Even with the drastic reduction in IVC filter placements, one study found that implantation rates in the U.S. are still high compared to those of five large countries in Europe.
Researchers used data retrieved from the National Inpatient Sample (NIS) database to identify all patients that had an IVC filter implantation in the U.S. from January 2005 to December 2014.
Using this information, the research team determined IVC filter placements in the U.S. to be 25-fold higher than select European countries, despite the controversy surrounding the anticoagulation device.
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