Clostridium difficile Guidelines

Clinical Practice Guidelines for Clostridium difficile Infection in Adults and Children: 2017 Update by the Infectious Diseases Society of America (IDSA) and Society for Healthcare Epidemiology of America (SHEA)

Clinical Infectious Diseases, Volume 66, Issue 7, 19 March 2018, Pages e1–e48,https://doi.org/10.1093/cid/cix1085

Summary from Infectious Disease Advisor: Updated C difficile Infection Clinical Guidance From IDSA/SHEA

The comprehensive clinical practice guideline …was endorsed by the Infectious Diseases Society of America (IDSA) and the Society for Healthcare Epidemiology of America (SHEA)…

Recommendations for treatment of CDI in adults… now favors a 10-day course of vancomycin or fidaxomicin rather than metronidazole for first-line therapy of mild/moderate CDI in adults… Fidaxomicin, also a newly recommended first-line therapy for mild/moderate CDI in adults, may reduce the risk for recurrent CDI because of its narrow spectrum compared with vancomycin.

Recommended treatment strategies for recurrent CDI, a complication that occurs in approximately 25% of patients, have also been revised…Following initial CDI treated with a 10-day course of vancomycin, either a several-week tapered and pulsed course of vancomycin or a 10-day course of fidaxomicin is recommended. For most patients, probiotics can be considered because of favorable cost and safety, although definitive efficacy data for probiotics to prevent recurrent CDI are still lacking. For multiply recurrent CDI (ie, at least 3 CDIs), correction of the patient’s underlying intestinal microbiota perturbation with fecal microbiota transplantation (FMT) should be strongly considered..

The diagnosis of CDI… Molecular tests (eg, nucleic acid amplification tests [NAATs], such as polymerase chain reaction), which do not differentiate colonization and infection, are now the most commonly used test for CDI among US hospitals. NAATs have the potential to misdiagnose patients with colonization as having CDI, particularly when used in patients with low likelihood of CDI. Thus, this guideline strongly reinforces the importance of practicing good diagnostic stewardship and limiting C difficile testing to patients with new-onset, unexplained, and clinically significant (ie, at least 3 unformed stools in a 24-hour period) diarrhea…formed stools should not be tested for C difficile, nor should patients be retested within 7 days of a previous negative C difficile test. In pediatric populations, because of the unclear role of C difficile as a cause of diarrhea in infants, children less than 12 months of age should not be tested…

If diagnostic stewardship is not an achievable goal, use of NAAT alone is likely to lead to frequent misdiagnosis of CDI among patients with C difficile colonization. In these cases, NAAT alone should be avoided and a multistep algorithm that incorporates toxin testing is recommended.

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Cumberland Island 2018

Complexity in Cystic Fibrosis Diagnosis

The availability of multiple diagnostic techniques for cystic fibrosis has increased the complexity and created areas of uncertainty.  A recent supplement (J Pediatr 2017; 181S: 1-55) delve into these issues.

“The diagnosis of CF has become increasingly complex, as CFTR mutations resulting in a wide spectrum of dysfunction have been increasingly identified.”

On page S6, 27 consensus recommendations are given.

The article S45-51, reviews cystic fibrosis transmembrane conductance regulator-related metabolic syndrome (CRMS) and cystic fibrosis screen positive, inconclusive diagnosis (CFSPID).  Key points:

  • CRMS and CFSPID are equivalent entities with CRMS being the preferred terminology in the US
  • CRMS/CFSPID are relatively frequent; for every 3 to 5 cases of CF, there is one case of CRMS/CFSPID.
  • The majority of CRMS/CFSPID do NOT develop CF. Approximately 10-20% develop clinical features concerning for CF.

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The Push to Improve Diagnosis

The Institute of Medicine’s (now called the National Academy of Medicine) “Improving Diagnosis in Health Care” (the link includes a link to a 1-hour briefing) is receiving a lot of attention. One recent commentary (H Singh, ML Graber. NEJM 2015; 373: 2493-95) elaborates on this issue. The IOM reports notes that “diagnostic errors affect at least 1 in 20 U.S. adults in outpatient settings each year, or 12 million adults per year.”

The report recommends “strengthening teamwork, reforming the teaching of diagnosis, ensuring that health information technology (IT) supports the diagnostic process, measuring and learning from errors in real-world practice, promoting a culture of diagnostic safety, reforming the malpractice and reimbursement systems, and increasing research funding.”

My take: This report highlights an enormous challenge for the healthcare system.  While IT support in theory sounds like it could help, right now IT isn’t helping much.  Many physicians are bogged down inputting data and trying to find enough time for critical thinking.  There is a lot of work ahead.