Maryn McKenna

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One surgical infection with MRSA: $61,000

December 28, 2009 By Maryn Leave a Comment

From a multi-state, public-private research team — Duke University, Wayne State University, and the Durham, NC VA — comes a precise and alarming calculation of MRSA’s costs in hospitals: For one post-surgery infection, $61,681.

The group compared the course, costs and final outcome of three matched groups of patients from one tertiary-care center and six community hospitals in one infection-control network run by Duke. The three groups were: patients with a MRSA surgical-site infection; patients with a surgical-site infection (SSI) due to MSSA, drug-sensitive staph; and surgery patients who did not experience infections, matched to the other two groups by hospital, type of procedure, and year when the procedure took place. (This same cohort has been described in an earlier prospective study that looked at risks for MRSA SSIs.) Altogether, there were 150 patients with MRSA SSIs, 128 with MSSA SSIs, and 231 uninfected surgery patients to serve as controls.

Here’s what they found. Patients with post-surgical MRSA infections:

  • stayed in the hospital 23 days longer
  • incurred an average extra cost of $61,681
  • were more likely to be readmitted to the hospital within 90 days
  • were more likely to die before 90 days had passed.

The authors write:

Our study represents the largest study to date of outcomes due to SSI due to MRSA. Our findings confirm that SSIs due to MRSA lead to significant patient suffering and provide quantitative estimates of the staggering costs of these infections. SSI due to MRSA led to a 7-fold increased risk of death, a 35-fold increased risk of hospital readmission, more than 3 weeks of additional hospitalization, and more than $60,000 of additional charges compared to uninfected controls.

For just the patients in this study, the excess costs (across 7 hospitals) totalled $19 million.

This is a highly useful study on several axes. First, remarkably, there has not been agreement over whether and how much of a problem MRSA poses in post-surgical settings, particularly when compared to drug-sensitive staph. This study provides careful, thoughtful, well-documented proof that combating MRSA infection is worthwhile. (NB, MRSA infections did not increase the risk of death relative to MSSA infections, which should remind us both of the often-forgotten virulence of MSSA, and also that MRSA’s perils can lie in extended illness and disability as much or more as in early death.) Second, by putting a very specific number on the cost of a post-surgical MRSA infection, it gives healthcare administrators a benchmark against which they can judge the cost of a prevention program. We’ve all heard complaints that prevention programs can be costly and their benefit is hard to measure in a bottom-line way. With this very specific number, that complaint should no longer be valid.

There’s a final point that is implied in the paper but not called out, so let me call it out on the authors’ behalf. These results are very likely an under-estimate of MRSA’s costs. That’s because, first, the specific procedures the patients underwent were cardiothoracic and orthopedic; those are not the surgical procedures most likely to be followed by a MRSA infection. And second, data collection for this study ceased in 2003, about a year after the first emergence of USA300 and several years before that very successful community strain began its current move into hospitals. However much MRSA was extant in 2003, there is more now.

The cite is: Anderson DJ, Kaye KS, Chen LF, Schmader KE, Choi Y, et al. 2009 Clinical and Financial Outcomes Due to Methicillin Resistant Staphylococcus aureus Surgical Site Infection: A Multi-Center Matched Outcomes Study. PLoS ONE 4(12): e8305. doi:10.1371/journal.pone.0008305

Filed Under: hospitals, infection control, MRSA, MSSA, nosocomial, surgery

Reducing errors: Worldwide proof that it’s not so hard

January 14, 2009 By Maryn Leave a Comment

There’s an encouraging joint announcement coming this afternoon from the World Health Organization and the New England Journal of Medicine. (I’ve set the timer on this post to publish when the embargo lifts.)

Using a simple but detailed checklist, eight hospitals in a mix of high-income and resource-poor areas were able to reduce their rates of surgical complications by one-third and their rate of death due to surgical complications by almost one-half.

The checklist study was sponsored by the WHO’s Safe Surgery Saves Lives campaign. It was headed by surgeon and author Atul Gawande, MD, who is lead author of the NEJM paper and has spoken passionately about checklists as a simple, reliable, reproducible, low-cost intervention that can return extraordinary improvements.

The checklist idea originates in medicine with Dr. Peter Provonost, Johns Hopkins University critical-care researcher and MacArthur “genius” fellow. Gawande wrote a profile of Provonost, and plea for checklist implementation, in the New Yorker in Dec. 2007, and followed that article two weeks later with a New York Times op-ed piece.

The checklist idea has been borrowed from other tech-intensive fields, notably aviation. As a licensed pilot, I can testify that no pilot or crew, no matter how experienced, would ever dare take off without running through a checklist. To believe that you can keep everything you need to do in your head without reference to an external reminder is, in aviation, simply not a credible position. It is considered an absurd display of ego that puts others at unnecessary risk. (For a taste of how aviation looks at medicine’s resistance to improvement, see Sir Richard Branson’s comments last month.)

In the current study, one hospital in each of eight cities — Toronto, New Delhi, Amman, Auckland, Manila, London, Seattle and Ifakara, Tanzania — agreed to follow a pre-, during- and post-surgery checklist for every noncardiac surgery on patients older than 16. The study group collected data before implementation of the checklist on 3,733 consecutively enrolled patients, and during the checklist implementation, on 3,955 patients.

The checklist is on the WHO website (.pdf in English) along with toolkits for implementation. If you look, you’ll see it is very simple. For instance, before anesthesia:

  • Patient has confirmed: identity, site, procedure, consent
  • Site marked (or marking confirmed not applicable)
  • Anaesthesia safety check completed
  • Pulse oximeter on patient and functioning
  • Does patient have a known allergy? (No/Yes)
  • Does patient have a difficult airway/aspiration risk? (No/Yes, and equipment/assistance available)
  • Is there a risk of >500ml blood loss (7ml/kg in children)? (No/Yes, and adequate intravenous access and fluids planned)

There are similar short, thorough and noncomplex checklists for before skin incision and before patient leaves the operating room. Amazingly — or not, for those of you who follow the struggle against medical errors — these interventions, simple as they are, were new to most of the study hospitals.

Now, the research team is careful to point out the possible confounders to this study: It introduced changes in systems at the hospitals that may have created independent effects. It may suffer from the Hawthorne effect (“Observation changes the behavior of the observed.”) Given that it used consecutively enrolled patients, it may be affected by secular trends at the individual institutions. And it does not track complications post-discharge.

All that being said, I think we can take this as a very potent argument for the adoption of surgical checklists as a component of campaigns to reduce medical errors. And, as Gawande says in the press release that WHO put out this afternoon, a pointer to possible improvements in other specialties as well:

These findings have implications beyond surgery, suggesting that checklists could increase the safety and reliability of care in numerous medical fields… [I]n specialties ranging from cardiac care to pediatric care, they could become as essential in daily medicine as the stethoscope.

The cite on the study is: Haynes, AB, Weiser, TG, Berry, WR et al. Surgical Safety Checklist to Reduce Morbidity and Mortality in a Global Population. N Eng J Med 2009: 260: 491-9. Published ahead of print Jan. 14, 2009.

UPDATE: The full text has been placed online for free.

Filed Under: checklist, hospitals, human factors, medical errors, surgery, WHO

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