Friday, June 24, 2011

6 Dr. Elizabeth Maloney On The IDSA Lyme Disease Guidelines

Recently, a commenter on Dr. Galland's article shared this link with me on one doctor's analysis of the 2006 IDSA Lyme disease panel guidelines.

Link source: http://www.peh-med.com/content/5/1/9/comments
(In reference to Philosophy, Ethics, and Humanities in Medicine 2010, 5:9 doi:10.1186/1747-5341-5-9)

I wanted to post Dr. Maloney's comment in its entirety here, for your review and consideration.

You can also see a 20 minute video presentation she did on ILADS containing this analysis:
http://www.ilads.org/lyme_disease/media/lyme_video_maloney.html

I will be evaluating her analysis and referring to the studies she cites - but in the meantime, if you are already more familiar with her analysis, please feel free to offer your own perspective on it in comments.



Insufficient Evidence and Poor Outcomes: IDSA Treatment Recommendations
Rightly Ignored

Elizabeth Maloney (2010-07-10 18:18)

Comments from IDSA president, Dr. Richard J. Whitley, suggest that he fully believes that “the best defense is a good offense”. Instead of addressing the shortcomings of the IDSA guidelines on Lyme disease, of which there are many, he assails Dr. Stricker and Ms. Johnson for not providing evidence that long-term treatments are valid.[1] He also tries to distract readers from considering the weak scientific underpinnings of the IDSA guidelines by raising the specter of unending courses of IV antibiotics and “life-threatening drug-resistant superbugs”; readers should not be fooled by such tactics.

Organizations which create treatment guidelines are obligated to prove the validity of their recommendations. This requires them to disclose the strength of their evidence so clinicians can use this information to judge the merits of the treatment recommendations. Because the IDSA Lyme guidelines issued 72 graded recommendations, it is easy for clinicians to lose sight of the fact that 54% of these, including 17 strong recommendations, were based on panel opinion.[2] Other guidelines developers, such as the American Academy of Pediatrics, require that the strength of a recommendation be matched to the strength of the underlying evidence;[3] unlike the IDSA, AAP would not restrict treatment options, via strong recommendations, purely on the basis of panel opinion.

The evidence strength ratings assigned by guidelines panels must be justifiable; even the pedestrian, IDSA-chosen review panel recognized that the strength of the supporting evidence had been stretched to reach the single-dose doxycycline prophylaxis recommendation.[4] And, evaluating the strength of an individual study requires more than a casual glance at the abstract and conclusion. When the article in question is written by a panelist on the 2006 guidelines, the examination should be especially vigorous so as to withstand charges of professional cronyism. This is also true when recommendations are issued to address areas of medical controversy.

This clearly did not happen with the IDSA guidelines. Consider the issue of treatment duration for erythema migrans, a contentious topic. The IDSA guidelines panel cited 8 prospective studies to support its recommendation; of these, only 2 investigated doxycycline regimens employing brief, 10 day treatment durations. In the study by Mazzarotti et al, the authors claimed the 10-day doxycycline arm had a 95% success rate.[5] However, of the 22 patients randomized to and completing this treatment, 7 were immediately retreated with doxycycline or amoxicillin and another patient later required IV ceftriaxone. Thus, 10 days of doxycycline failed to cure 36% of the patients, not 5%. One would think that such a gross overstatement of treatment success would have been caught by a diligent guideline panel; panelist Steere, as one of Mazzarotti’s co-authors, may have been best positioned to prevent the inclusion of this study in the guidelines. The other study, by guidelines panelist Wormser, had excessive drop-out rates.[6] At the study’s completion 49% of the subjects were “unevaluable”; at the earlier 12 month evaluation, 29% of the patients were already “unevaluable.” Biostatisticians warn against drawing outcome conclusions when drop-out rates exceed 20%;[7] thus, the panel also erred in citing the study by Wormser as supportive. If these studies are representative of what the IDSA considers “sound scientific evidence”, perhaps it is premature to be making recommendations in the first place.

After discovering a lack of support for the 10 day doxycycline regimen, I re-evaluated the data from the other 6 trials cited as supportive evidence for the early Lyme disease treatment recommendations.[8-13] During that process, I reanalyzed the outcome data using intent-to-treat methodology (ITT) as opposed to the complete-case(cc) or last-observation-carried-forward (LOCF) methods used in the original papers. ITT is the method preferred because CC and LOCF overstate treatment outcomes.[14] Differences in study designs and in the definitions of treatment success, improvement and failure make direct comparisons difficult but if success is defined as a return to the pre-morbid baseline without relapse during the observation period, then the overall success rates for doxycycline, amoxicillin and cefuroxime are roughly 65%. While this may seem incredulous to many, the review panel, which received my analysis in the course of its deliberations, suggested that future guidelines describe the first-line agents as “effective” rather than “highly effective”.[4]

Dr. Whitley expressed concerns regarding the use of long-term antibiotics in patients with persistent symptoms. There can be no doubt that such approaches carry risks but those risks must be weighed in light of the situation for which they are employed; this is not a case of using sledgehammer to swat a fly. The disease burden in this group is quite high, as the retreatment trials demonstrated.[15-17]

The IDSA guidelines also prohibit retreatment for patients with late neurologic Lyme disease who remain symptomatic following 30 days of ceftriaxone. This restriction is based on scant evidence. The guidelines cite only 4 trials, with a total of 96 patients representing a limited disease spectrum, which can be analyzed in terms of neurologic outcomes.[18-21] In this very small cohort, treatment successfully restored health in only 7 – 35% of the patients. Such a poor outcome is unacceptable for a patient group burdened with a disease causing a profoundly negative impact on the quality of their lives.

While physicians are cautioned to do no harm, it is clear that for the majority of patients with late neurologic Lyme disease, doing nothing more is harmful. To appease those looking for a scientific basis for additional antibiotic therapy, I suggest they read the 1999 study by Logigian et al.[21] In that open label trial using 30 days of ceftriaxone, one patient (who was well at the 6 month evaluation) reported a relapse, supported by a deterioration in his verbal and visual memory, 2 months later. Based on that information, the authors retreated him with 30 additional days of ceftriaxone and he demonstrated sustained improvement. Given that Steere served on the original guidelines panel and co-authored this paper, it is curious that the IDSA recommends against retreatment. Given the poor outcomes to shorter treatment durations and the disease burden, it is unconscionable.

Similarly detailed critiques can be made for the other major recommendations. Rather than shoot the messengers (Dr. Stricker and Ms. Johnson), Dr. Whitley should heed the message: the IDSA failed, in its initial and review efforts, to create impartial, conflict-free, evidence-based guidelines. Moreover, the errors of the guidelines panel were compounded by the review panel, which had an obligation to provide an unbiased review and right these transparent errors. Those of us who understand the situation lack mechanisms to resolve it. The duty remains with the IDSA members; physicians, heal thyselves.

References
1. Whitley RJ. IDSA Response to Stricker and Johnson. http://www.peh-med.com/content/5/1/9/comments
2. Wormser GP, Dattwyler RJ, Shapiro ED, Halperin JJ, Steere AC, Klempner MS, Krause PJ, Bakken JS, Strle F, Stanek G, Bockenstedt L, Fish D, Dumler JS, Nadelman RB. The clinical Assessment, Treatment, and Prevention of Lyme Disease, Human Granulocytic Anaplasmosis, and Babesiosis: Clinical Practice Guidelines by the Infectious Diseases Society of America. Clin Infect Dis 2006;43(9):1089-134.
3. American Academy of Pediatrics: Steering Committee on Quality Improvement and Management. Classifying Recommendations for Clinical Practice Guidelines. Pediatrics 2004;114;874-877.
4. Infectious Diseases Society of America: Final Report of the Lyme Disease Review Panel of the Infectious Diseases Society of America. April 22, 2010. http://www.idsociety.org/Content.aspx?id=16499
5. Massarotti EM, Luger SW, Rahn DW, et al.. Treatment of early Lyme disease. Am J Med 1992; 92:396–403.
6. Wormser GP, Ramanathan R, Nowakowski J, et al.. Duration of antibiotic therapy for early Lyme disease: a randomized, double-blind, placebo-controlled trial. Ann Intern Med 2003; 138:697–704.
7. Schulz K, Grimes D. Sample size slippages in randomised trials: exclusions and the lost and wayward. Lancet 2002; 359: 781–85.
8. Luft BJ, Dattwyler RJ, Johnson RC, et al.. Azithromycin compared with amoxicillin in the treatment of erythema migrans: a double blind, randomized, controlled trial. Ann Intern Med 1996; 124:785–91.
9. Dattwyler RJ, Volkman DJ, Conaty SM, Platkin SP, Luft BJ. Amoxicillin plus probenecid versus doxycycline for treatment of erythema migrans borreliosis. Lancet 1990; 336:1404–6.
10. Eppes SC, Childs JA. Comparative study of cefuroxime axetil versus amoxicillin in children with early Lyme disease. Pediatrics 2002; 109:1173–7.
11. Nadelman RB, Luger SW, Frank E, et al.. Comparison of cefuroxime axetil and doxycycline in the treatment of early Lyme disease. Ann Intern Med 1992; 117:273–80.
12. Luger SW, Paparone P, Wormser GP, et al.. Comparison of cefuroxime axetil and doxycycline in treatment of patients with early Lyme disease associated with erythema migrans. Antimicrob Agents Chemother 1995; 39:661–7.
13. Dattwyler RJ, Luft BJ, Kunkel M, et al.. Ceftriaxone compared with doxycycline for the treatment of acute disseminated Lyme disease. N Engl J Med 1997; 337:289–94.
14. Fitzmaurice GM, Laird NM, Ware JH. Applied Longitudinal Analysis. Hoboken, N.J. Wiley-Interscience, ©2004; pp 391-4.
15. Klempner MS, Hu LT, Evans J, et al. Two controlled trials of antibiotic treatment in patients with persistent symptoms and a history of Lyme disease. N Engl J Med 2001;345(2):85–92.
16. Krupp LB, Hyman LG, Grimson R, et al. Study and treatment of post Lyme disease (STOP-LD): a randomized double masked clinical trial. Neurology 2003;60(12):1923–30.
17. Fallon BA, Keilp JG, Corbera KM, Petkova E, Britton CB, Dwyer E, Slavov I, Cheng J, Dobkin J, Nelson DR, Sackeim HA. A randomized, placebo-controlled trial of repeated IV antibiotic therapy for Lyme encephalopathy. Neurology 2008;70:992-1003.
18. Dattwyler RJ, Halperin JJ, Pass H, Luft BJ. Ceftriaxone as effective therapy for refractory Lyme disease. J Infect Dis 1987;155:1322–5.
19. Dattwyler RJ, Halperin JJ, Volkman DJ, Luft BJ. Treatment of late Lyme borreliosis—randomized comparison of ceftriaxone and penicillin. Lancet 1988; 1:1191–4.
20. Logigian EL, Kaplan RF, Steere AC. Chronic neurologic manifestations of Lyme disease. N Engl J Med 1990; 323:1438–44.
21. Logigian EL, Kaplan RF, Steere AC. Successful treatment of Lyme encephalopathy with intravenous ceftriaxone. J Infect Dis 1999;180:377–83.

Competing interests: None

6 comments:

  1. What is your opinion of the Babesia FISH test?

    John S

    ReplyDelete
  2. John S,

    Been a while since I've seen you here, if you're the same John S? Welcome back.

    I don't have much of an opinion of it... I mean, I haven't read up on Babesia FISH and IFA testing - FISH is supposed to be better than PCR for Babesia is what I know. FISH tests detect ribosomal RNA of the Babesia on air-dried blood smears & is pretty specific - the geimsa stain smear can't differentiate between malaria parasites and Babesia. That said, the treatment is pretty much the same if you have either, anyway.

    Are you looking for any specific information on Babesia FISH tests? Trying to figure out if you have Babesia or not? A good clinical diagnosis and patient history are important here - tests are meant to be supportive.

    And while you're here, what do you think of Dr. Maloney's analysis of the guidelines?

    ReplyDelete
  3. I come and read all the time. I liked the article on the new Lyme tests for dogs. I haven't read the article I commented on. I'll get to it. I read about a third of what you put up. When they are long and technical I would suggest putting up a synopsis; I've had to stop reading one or two when my brain gave out=)


    My FISH test came back positive, I thought the Babesia was gone.

    It is a pain to post here though, for some reason I have to keep hitting post comment like 4 or 5 times.

    John S

    ReplyDelete
  4. John S,

    Good to hear you are enjoying the site and liked the article on the Lyme tests for dogs - anything in particular about that article that interested you? Are you a dog owner, or were you more interested in finding out if similar kinds of tests were available for people?

    Thanks for the feedback on the synopsis. I'll see what I can do about providing one - it may be useful for some of my feed subscribers, too.

    I'm sorry to hear about your positive test. Have you been experiencing any symptoms that map to Babesia at all?

    I have been having trouble on occasion posting comments here, too - I suspected it's Blogger's server being heavily used - but since I now have a data point greater than 1 (me), I'll look into tech support and see what they have to say. Thanks for the reminder/heads-up and sorry it's a pain.

    ReplyDelete
  5. No, I don't have a dog. I just found the test itself intersting.

    I have no Babesia symptoms I know of.

    John S

    ReplyDelete
  6. John S,

    I suppose it's possible you have a subclinical infection and are positive but asymptomatic for Babesia. Your doctor would be the best person to talk to about whether that requires treatment or not.

    ReplyDelete

You can use <b>bold</b>, <i>italics</i>, and <a href="url">link</a> for links.

The Camp Other Song Of The Month


Why is this posted? Just for fun!

Get this widget

Lyme Disease

Borrelia

Bacteria

Microbiology

Related Posts Plugin for WordPress, Blogger...