Medtronic Revo Pacemaker (Designed to Permit MRI Scanning)

You see, up until the Revo, pacemakers were considered a very potent contraindication to MRI exams. Interference from the MRI acting on the pacemaker could turn the pacer off, turn it into a fairly benign ‘asynchronous mode’, start pacing your heart as if it were a hummingbird’s at 100′s of beats per minute, burn cardiac muscle, or drain the pacer’s battery precipitating an earlier-than-planned replacement.

Some pacemaker patients could still get MRI exams, but you had to be the right kind of pacemaker patient, with the right kind of pacing device, needing the right kind of MRI on the right kind of scanner. Even then, you ought to have had the cardiologist and a code team (to resuscitate you if the MRI and your pacer decided to not cooperate), plus someone to de-program and re-program your pacer. Even with those protections, some insurance companies simply forbid coverage of MRI exams for any pacemaker patient.

Along comes the Medtronic Revo pacemaker. This is the first FDA-approved biostimulation implant that has been specifically designed, from the ground up, to permit MR examinations (though it won’t be the last). It is not, however, carte blanche for MRI examinations. There are important limitations, or conditions, for its safe use.

There are three designations, each with very specific critera, that an object or medical device can obtain to describe its relative safety in the MR environment, ‘MR Safe’, ‘MR Conditional’, and ‘MR Unsafe’. Given the fact that I just described the Revo as having important limitations, or conditions for safe use, which of these three designations do you think the Revo has earned?

If an object receives the ‘MR Safe’ designation, it means that that object would be safe under any allowable MRI conditions. Field strength? Doesn’t matter. Magnetic spatial gradient? Who cares. Time-varying gradient? No worries, mate. RF deposition? Don’t worry your pretty little old head. In short, to receive the ‘MR Safe’ designation there can not be any restrictions on its use.

So here we are, with a pacemaker that isn’t ‘MR Safe’, but is being touted in nearly every medical media (or mass media with a health reporter) as the “MRI Safe pacemaker”.

[We'll ignore, for this entry, the fact that a company has already copyrighted the phrase "MRI Safe", as well as the fact that this company uses the copyrighted name to describe products that aren't classified as 'MR Safe'.]

For the lay person, my hair-splitting must seem awfully pedantic. The problem is that the technologist who will administer a patient’s MRI exam gets the bulk of the information about the patient’s medical history from the patient, himself. If the patient doesn’t remember the brand-name of the pacemaker (and so many of them seem to forget — or at least fail to disclose — that they even have the device, I think remembering the model and manufacturer is very unlikely), they’re probably likely to remember that this particular one was “MRI safe”. Now the technologist, charged with vetting the patient for MRI safety, is being given misleading information about the safety of scanning that patient.

So, my call to healthcare media and reporters is to please… PLEASE stop calling the Revo the “MRI Safe” pacemaker. Call it what it is, the first pacer designed to allow MRI scanning, or the first MR Conditional pacemaker, or even Medtronic’s towering achievement (which it is).

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The Joint Commission (TJC or, to those of us schooled in their acronym more than 3 years ago, JCAHO): TJC has just referenced the 2010 edition of the Guidelines for Design and Construction of Health Care Facilities as the new design and construction standard (effective today). The 2010 Guidelines codifies a number of the MR safety recommendations that have passed from the Joint Commission’s own lips and makes them standards for new construction. In 2011 I will apply whatever cajoling, leveraging, sweet-talking, or shaming that will help the Joint Commission to apply it’s own standards to the thousands of existing MRIs at TJC accredited providers. This began last year with training provided to TJC’s ambulatory care surveyors, forestalled and rebuffed offers of the same for their hospital surveyors.

Centers for Medicare / Medicaid (CMS): At least somewhat in response to the public attention that was focused on the issues of radiology / nuclear medicine safety through the ongoing series of articles by Walt Bogdanich of the New York Times, in 2010 CMS began development of a set of radiology / nuclear medicine patient safety standards that they intend to roll-out as a condition of reimbursement. It is anticipated that these will be unveiled in the spring for public comment before being enacted some time later. I know that, last year, MR safety proposals were presented to CMS, and at the anticipated public meeting I will seek to make sure that the single largest healthcare benefits provider in the US includes substantive MR safety standards.

Food and Drug Administration (FDA): Quick as they were to arrange public hearings on radiology safety (after the first couple Bogdanich articles saw print), the FDA has been ‘in the planning and coordination’ stages of a similar meeting on MRI safety for well over six months. Originally proposed for last year September, the prospective date has been nudged enough times that, as of my last inquiry, they’ve stopped even suggesting months, or even seasons, and I was last left with the promise of ‘sometime in 2011… hopefully the first half…’ I will endeavor to see that this meeting takes place (perhaps in concert with the CMS meeting), because I know that smart, capable people within the FDA have done analyses of MRI accidents and have developed an MR safety ‘short list’ of preventions which the FDA has yet to release, to say nothing of promulgate or endorse. Sitting on effective safety solutions when the accident rate is quadrupling is… well… inconceivable.

American College of Radiology (ACR): At the ACR’s presentation at the 2009 annual meeting of the American Healthcare Radiology Administrators (AHRA), the ACR representatives announced that the organization was going to incorporate MR safety standards from it’s own ACR Guidance Document for Safe MR Practices: 2007 in the ACR’s MR accreditation program. In 2010 I was privately told by a very well-placed person within the ACR that the new CMS oversight of the MIPPA accreditation process made it ‘logistically onerous’ to change the existing MR accreditation program (this despite the fact that the ACR was pleased to submit to CMS — and receive prompt approval for — an entirely new breast MR accreditation program). In 2011 we expect to see a new edition of the Guidance Document, which will make the fourth publication appearing under the ACR’s name that speaks to effective solutions for the reduction of MR accidents… and the fourth one that the ACR will have not included as an element of their own MR accreditation program. Whether it’s through meaningful standards passed down from CMS, or by reversing the apparent hypocrisy of the ACR, itself, I will spend 2011 working to see that substantive MR safety standards are incorporated as a part of the ACR’s MR accreditation program.

So what is the monster-list of standards that would be necessary to mitigate the vast majority of MRI accidents and injuries? Well, it turns out that it isn’t long at all, and all of these are already promulgated as best practice recommendations…

1. Provide annual MR safety training for all MR personnel (and MR irregulars)
2. Restrict access to controlled areas of the MR suite for unscreened / unsupervised persons and untested equipment per the ACR 4-zone model
3. Provide uniform and documented screening for all persons entering controlled areas of the MR suite
4. Screen persons and objects with a ferromagnetic-only detector before allowing access to controlled areas of MR suite
5. Provide hearing protection (and ensure proper usage) for all persons remaining in the magnet room during the MR exam
6. Use positioning aids and insulating pads as recommended to separate the MR patient from RF elements and conductive materials (including their own tissues)

These six items would likely cut the rates of MR accidents by more than 90%! These items have also been recommended (or very similar elements) by the Joint Commission, ACR, and others. If they were enforced, however, we could very nearly eliminate MR accidents in governed facilities!

Getting us to enforcement, that is my 2011 New Year’s Resolution, but I won’t make it there alone. Can I count on you to work on this with me?

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In about 4 years, NSF was identified (originally called Nephrogenic Fibrosing Dermopathy), the culprit identified, the population-specific susceptibility deduced, and effective screening protocols developed and deployed. Yes, it is still possible to develop NSF today, but we also have the tools requisite to interdict the agents that trigger the disease, and an industry-wide awareness of the preventative steps which are effective in doing so.

This is a testament to an international confederation of radiologists, nephrologists, pharmacologists and pathologists who collaborated on the challenge of this disease. It is worthy of a self-congratulatory pat on the back for radiology that we were able to sleuth-out the cause, and disciplined enough to execute effective prevention, in such a short time. But lest we spend too much time singing our own accolades, we should remember that more than 92% of MR accidents studied (selected based on the availability of information on causation), were made up burns, projectiles and hearing damage. These aren’t clinical problems, per se, rather they’re operational in nature.

Perhaps that accounts for the disparity in response. MR is a clinical instrument, and NSF was in the clinical wheelhouse. Yes, it extended well beyond radiology, but it was (and still is) essentially a clinical issue.

More often than not you will never find a radiologist actually in an MRI suite, so they are unfamiliar with – and often uncomfortable with – operational concerns. There are, of course, exceptions to this but those are… well… exceptional.

If NSF can be identified, studied, researched, and ultimately almost universally prevented in the course of a handful of years, how is it that we continue to see alarming year-over-year growth in combined burns, projectiles and hearing damage? If we can study a brand new disease and prevent it with nearly 100% effectiveness, why can’t we make sure insulating pads are used, or that ferromagnetic detectors are part of every MRI center, or that we make sure that hearing protection is used (and used properly)?

For these injuries there is no direct-causation mystery. We don’t need expensive animal trials, or chemical analysis of different contrast agents. We don’t need an international interdisciplinary clinical team. We need pads, ferromagnetic detectors, and earmuffs.

So my appeal, made plain in the headline, is for us to let NSF go. Let us not dwell in an anachronistic state of fear, nor linger any longer in self-congratulation. We have other tasks to help make MRI as safe as we know it can be, and we need to redirect our attention to that job ahead of us.

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“Hey, you, MR technologist! Make sure you know what you’re supposed to know to keep people safe around MRI.“

Make no mistake, as someone who spent a decade in college (which included a Masters degree and about half of a 2nd Bachelors), I’m a huge fan of education. What I’m adamantly opposed to – when it comes to MRI safety – is education without any standards or benchmarks, which is precisely where we find ourselves today.

The title of this post really isn’t far off the mark of what the current expectations of safety are. Regulatory, licensing and accreditation bodies seem to be unanimous in their concern that explicit MRI safety standards (even for education) would be ‘burdensome’ to the provider. As a result, many MRI providers find themselves in a position where they aren’t provided support tools to enhance safety, with the rationale that a ‘good tech is all you need.’ But at the same time, nobody has defined what MRI safety knowledge makes the ‘good tech’, well… good.

In a few weeks I’m going to be at the ACR ‘Maximizing Value in Radiology through Quality and Safety Improvements‘ meeting. At that meeting, I’ll be presenting information from a paper written by Dr. Emanuel Kanal and me; a retrospective analysis of FDA adverse event reports on MRI. The data is pretty grim.

Since 2004, reported MRI adverse event reports are up to a number more than 4-times what they were. Of the MR-specific reports, just over 92% of them fall into 3 categories, each of which could be significantly attenuated if existing ‘best practice’ guidance was simply adopted as required standards. Our analysis found that 80% of these adverse events had an explicit, measurable best practices that would have stopped them, and that doesn’t even include benefits to be gained from ill-defined standards for ‘provide MR safety training.’ Presumably enhanced training would both reinforce the explicit performance measures (enhancing the effectiveness of mitigating those 80% of events), and would likely diminish the 20% remainder that weren’t directly combated by the explicit measures.

So while the trend data is very disconcerting, the good news is that we already have the tools to reverse the alarming growth in MRI accidents. This patient safety initiative is so extremely ‘shovel ready’ that it could be deployed with little more than a few words amending existing accreditation and license standards.

In the meantime, imaging providers are slashing staffing ratios, cutting out travel allowances for conferences and training, seeking out less-experienced MR personnel (who will work for a lower salary). So while we admonish MR techs to ‘learn what you don’t know that you don’t know,’ we’re simultaneously taking away the tools that they might actually need to accomplish this near-impossible task.

In the weeks ahead I’ll be able to share more of Dr. Kanal’s and my research, but the take-away is already apparent…

We will continue to injure our MR patients, visitors and techs at increasing rates unless the accrediting bodies (ACR, TJC, and IAC), the regulatory authorities (FDA and individual State departments of health) and 800-pound gorilla payors (CMS) pick up and codify the practice standards that have been laid at their feet.

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Wired UK Illustration by Lee Hasler. Click for Wired UK source.

The UK edition of Wired magazine just ran one of their ‘featurettes’ on this blog and picked their favorite (though, that’s a slightly squint word-choice for potentially deadly accidents) types of projectile accidents. Quote’s from — and a direct link to — the article follow.

Often when I renew my subscription to Wired (the US edition) I get the complimentary tote, or whatever other trinket they’re giving away. This time, however, apparently my renewed subscription coincided with a small feature in the UK edition for this blog! [Perhaps I should start subscriptions to Forbes or Yachting to see if there's content-related good fortune that rubs off from either of those!!]

Below are quotes from the article (the original version of which is just a click away on the article title, below) and some of my added links to related content that aren’t in the online edition of the article. Please do visit the Wired UK site (click on the quoted headline, below) because they have embedded links to other, very interesting related Wired articles.

MRI’s fatal attraction

By Vaughan Bell|06 August 2010

Look out! It’s the dark side of the magnetic force

“It’s like Russian roulette, except that many don’t know that they’re even playing,” says Tobias Gilk, a California-based MRI safety consultant. MRI scanners have electromagnets so powerful that they can dislodge pacemakers, suck in beds from across the room and turn small metal objects into dangerous “ferromagnetic projectiles”. Gilk now collects data and reports of incidents at mrimetaldetector.com/blog.

[Well, maybe not dislodge pacemakers, but certainly disrupt them... sometimes with fatal results.]

Here are six of Wired’s favourite MRI metal menaces.

Floor polisher
This is so common that the internet has whole galleries of trapped cleaning machines. Floor polishers end up stuck in scanners when cleaners stroll into MRI facilities out of hours and only realise they’re in trouble when their equipment starts to gravitate towards the magnet.

[We could establish a very long gallery of floor polisher accident photos. In fact, in the 'Flying Objects' image collection of my friend Moriel Ness Aiver on his website, SimplyPhysics.com, there are quite a number of them to see! And while they don't show you the actual accident, here's a link to a Seattle news story on a floor-polisher meets MRI accident that occurred there.]

Metal gurney
A patient and a metal gurney were both lifted off the ground and pulled towards the magnet as they were accidentally wheeled into the MRI room. The scanner had to be shut down in order to free the bed, and the unlucky patient suffered from foot, ankle and leg fractures.

[Here's a link to the FDA accident report for this specific accident (the news account having been linked above). And here's a link to a popular image showing an ICU bed magnetically adhered to the face of an MRI scanner.]

Pistol
An MRI machine disarmed an off-duty US police officer. She forgot she was carrying her Glock pistol as she accompanied her mother, who was being scanned. The gun was pulled by the magnetic force, jamming her hand between the pistol and the machine and trapping the officer.

[Here's a link to my summary of the news story from that specific incident. There is also a peer-reviewed journal piece on a different, but similar, incident in which the handgun actually fired, despite the presence of two engaged safeties.]

Flat-screen
A member of the public who was inside the scanner solely for research purposes got badly injured when hospital staff walked a flat-screen monitor through the room. The magnetic field tried to put the screen and the participant in the same place; the next stop was casualty.

[Here's the link to the FDA accident report PDF for this one, too.]

Scissors
An MRI technician ended up with a pair of scissors embedded in his forehead as he prepared a patient. Someone entered the scanner room with the scissors in their pocket — they were pulled out by the magnet and collided arrowstyle with the technician’s head.

[There have been multiple accidents involving flying scissors in the MRI room. This one is among the most severe.]

Wheelchair
A wheelchair brought into the danger area shot across the room and pinned a radiographer to the scanner. The staff member was unharmed but a patient waiting for her scan was so frightened she fell off the bed and broke her leg.

[As with floor polishers, there have been many, many incidents of not-safe-for-MRI wheelchairs being brought to the MRI room. You can see a couple of these, as well as a sampling of other projectile objects here.]

Wired UK, September 2010

I am very flattered that the editorial staff at Wired UK included information on our humble little blog in their September, 2010 issue. I hope that this sort of attention raising opportunity is not lost on the audiences in the US and elsewhere.

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Well, in case your imaginations have only wrapped around the aftermath, and not the incident, I’ve just recently come across another visual aid that might just help you with the complete picture. Imagine a pair of scissors, an MRI, and a pumpkin…

MRI + scissors + pumkin = Do Not Try This!

Now, the screen shot, above, taken from the video doesn’t do the moving picture justice. I encourage you to take a look at it for yourself. But before you do it is vital to remember that this isn’t just a hypothetical. This accident and many, many other MRI projectile accidents – with, thankfully, less catastrophic outcomes -  occur all the time.

This isn’t simply a gee whiz scientific demonstration. This represents the real nature of projectile threats. It is at our (and our patients’) own peril that we relegate these to intellectual curiosities instead of cautionary tales.

So, with that prelude, you can find the video here.

I hope that every single MRI is adequately protected against similar sorts of accidents. This protection should include, in nearly every instance, ferromagnetic detection screening of patients, visitors, and equipment.

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That’s right, the FDA has updated it’s MRI accident figures available online through the MAUDE database. We were alarmed and astonished when we thought that the rate of increases in MRI accidents was only 270% (from 2004 to 2008). Turns out that the FDA must have found additional accident reports that were in a stack of junk-mail, or got lost between the sofa cushions, which means that the rate if adverse events went up, significantly, in 2008 from the prior calculation.

Somehow, when I did the analysis last year (in 2009) of the 2008 numbers, it was apparently 11% shy of the final total. When we add the (previously uncounted) adverse events, the actual rate of accident growth is 310%!!!

Between 2004 and 2008, MRI Accident Rates Increased 310%

That’s right, in 2008 we were more than 4 times as likely to injure someone during an MR exam than we were just four years earlier!

What would happen in your town if:

• Traffic accidents quadrupled in 4 years?
• Rates of violence in schools quadrupled?
• Divorce rates increased 4x in 4 years?

Alarm bells, that’s what! People for certain would not be complacent.

There would be efforts to figure out why, and fix whatever was going wrong. Reduced speed limits or more traffic enforcement? You bet! Counselors in the schools and demands for greater teacher and parent involvement? Darn right! Lay and religious leaders reassessing the very nature of the marital institution in our society? Abso-friggin-lutely!

So, with an exploding rate of MRI injuries and adverse events, what is being done to identify and curb the source of these incidents? [cue cricket sounds]

NOTHING!

Apart from the continuous efforts of a small cadre of MR safety advocates, whose cries have (apparently) fallen on deaf ears, there are no substantive accreditation, licensure, or regulatory actions that have reversed the trend of the last several years.

The silver-lining may be that the increase from 2008 to 2009 was very modest. Perhaps we’re leveling-off, or perhaps, like 2004, this is just a momentary pause before we skyrocket upwards again. And given the FDA’s marked upward adjustment of the 2008 numbers, it may wind up being another year before we can feel confident about the 2009 accident report numbers.

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If you’d like to watch it, it’s in 3 parts. The first of 3 is available here (requires QuickTime viewer).

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Just a few months ago a service engineer was replacing a fan-blower assembly in an MRI unit (a part that is notoriously ferromagnetic). Working alone in the suite in the evening, after the regular staff had left, the engineer had finished early… or that’s what the security guard thought when he called to her and got no reply.

Turns out that she had been struck and pinned to the MR scanner by the blower assembly, and was unconscious, if not already dead, when the guard checked to see if she was still there.

This tragic story is something of a departure from my typical mantra of patient and staff safety. Yes, this was a trained individual who knew about the risks of the MR environment and materials she was working with. And yes, this was a vendor, and not a hospital worker or patient. But this is a repeatable condition, and an accident which, because there have been MRI accidents involving such a tremendous variety of ferromagnetic materials, deserves a little analysis for a ‘lessons-learned’ output.

One of the (theorized) main contributing factors to this accident is the design of the magnet room. Since the advent of active shielding, we’ve seen MRI rooms go from the size of racquetball courts to office cubicles. In this case, the clearances around the magnet were uncomfortably tight, and what space there was between the magnet and the walls of the suite was purportedly infringed by shelves, storage and clutter.

By failing to provide an appropriately-sized room to accommodate not only the MRI unit itself, but also the service and storage needs, the layout may have substantially increased the likelihood of an accident.

And while conventional screening methodologies wouldn’t have helped in this particular scenario (the object already in the MRI room), it’s not like this is the only strange thing that has been brought into a MRI room to be ‘sucked’ into the scanner. Yes, we all know about oxygen tanks (well, apparently we don’t, as there was another one reported recently, here), but they aren’t all!

Personal computers, iPods, filing cabinets, desk chairs, anesthesia machines, cribs, gurneys, wheelchairs, dollies, staplers, power tools, axes, roller skates, ‘sand’ bags, hampers, mop-buckets, and the list goes on, and on, and on… All of these, and many, many more objects have found their way into MRI scanner rooms. Sometimes the people involved, like in the circumstances surrounding the recent fatality, know that they’re taking a risk. But at least as often the accident occurs because the person is unaware of what they’re doing.

The magnets don’t take vacations. They’re not on just when ‘taking the picture’. They’re not turned off for the night when the last patient is done for the day. The risks are omnipresent, which demands that we are equally vigilant about providing the appropriate protections for everyone and everything that approaches the MRI room.

In the weeks ahead, I hope to have information for you about some of the efforts in the works that may help codify some of these expectations at the point of care. Suffice it to say that right now, for the first time in the U.S., substantive consideration is being given to explicit MRI safety requirements at the point of care. This is still all in the formative stages, and lots of work remains to be done. But perhaps when it is, there’s an umbrella drink and sandy beach with my name on them.

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About fifteen years ago, there was a fire at a medical office building in Stockton. The smoke was so thick that the firefighters searching the building didn’t see the MRI warning signs on the door they went through. Once inside the room, one firefighter felt his pike (a long stick with a hook at the end used to pull apart loose materials to look for fire) pulled to the MRI scanner.

Immediately recognizing the hazard, the firefighter went and told the incident commander of the risk. But before a warning could be broadcast to the other firefighters, a different fireman, this one with an axe on his belt, approached the MRI scanner and was pulled, bodily, to the scanner by the attractive forces acting on the axe-head.

Fortunately, no serious injuries resulted. (click here for an article on this incident)

Fast-forward to March of 2010, when Stockton MRI goes up in flames.

Stockton, California, MRI Center on Fire.

This time, the firefighters’ hoses, axes and pikes are supplemented with their acute awareness of the hazards of MRI. No firefighter will enter the MRI scanner room without confirming that the magnet is not at field, first. The fire, which didn’t originate in the scanner room, will be fought from all locations except the magnet room.

Apparently, however, one of the MRI’s at the center was in cahoots with the MRI from the fire 15 years earlier, and desperately wanted its very own firefighter souvenir. According to the newspaper report, the magnetic field from the MRI within the building pulled an axe out of the hands of a firefighter who was working on the roof of the imaging center!

As before, the accident did not result in any injuries. Unlike the prior incident, this MRI was denied its own firefighter souvenir .

The moral of this story is that if you’re a firefighter, be very cautious of the MRI’s in Stockton, California. In fact, since we don’t know how far this MRI conspiracy goes, it might be wise for geared-up firefighters to be extraordinarily cautious near all MRI’s!

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