Researchers at Vanderbilt University Medical Center and colleagues have identified a gene that increases the risk for a severe and potentially life-threatening reaction to the commonly prescribed antibiotic vancomycin.
Routine testing for this gene could improve patient safety and reduce unnecessary avoidance of other antibiotics, they reported in the Journal of Allergy and Clinical Immunology.
"We think this test will be important in the clinical care of patients starting vancomycin and will prevent mortality and short- and long-term complications," said the paper's senior author, Elizabeth Phillips, MD, an internationally known expert on severe adverse drug reactions. "This observation also represents significant progress as we zero in on the mechanisms of these life-threatening immune-mediated drug reactions," she said.
Vancomycin is commonly given in the hospital or as home intravenous therapy for several weeks in combination with other powerful antibiotics to treat serious and potentially life-threatening bacterial infections.
Within two to eight weeks of initiating antibiotic therapy, however, some patients develop a severe reaction known as DRESS -- Drug Rash with Eosinophilia and Systemic Symptoms -- characterized by fever, widespread skin rash and internal organ damage caused by an aberrant T-cell mediated immune response to the drug.
When DRESS develops, all treatment is stopped. The mortality rate that results, often from a combination of organ damage, the need for strong immunosuppressants such as steroids and compromised treatment options for the underlying infection, approaches 10 percent.
While the true incidence of DRESS is not known, every year in the United States "hundreds of thousands of patients are at risk," said Phillips, the John A. Oates Professor of Clinical Research and professor of Medicine, Pharmacology and Pathology, Microbiology and Immunology at VUMC and Vanderbilt University School of Medicine.
For several years, vancomycin has been known to be a common antibiotic trigger for DRESS, however the genetic risk factors predisposing specific patients were not known.
This new finding shows that vancomycin-associated DRESS occurs in patients who carry specific variations in human leukocyte antigen (HLA) genes. HLA genes encode proteins that present foreign peptides (antigens) to T cells (a kind of white blood cell) to stimulate an immune response.
To better understand the HLA-DRESS connection, the researchers searched VUMC's biobank, BioVU, which contains nearly 250,000 unique, research-ready DNA samples linked to de-identified patient records.
Through a detailed search mechanism and review of the records they were able to identify that patients in the databank who developed DRESS while taking vancomycin had an over-representation of the genetic variant HLA-A*32:01.
The researchers confirmed their findings in a prospective cohort of patients from VUMC and Australia who had been diagnosed with DRESS.
Since many patients who develop DRESS are often exposed to multiple antibiotics and other drugs simultaneously, the researchers used a specific diagnostic test developed in their laboratories called gamma-interferon ELISpot, which exposed patients' white blood cells to vancomycin and other concurrently administered antibiotics.
This test enabled them to determine which drug was most likely causing DRESS.
Combining the BioVU and prospective data, the researchers found that 86 percent of patients who developed probable vancomycin-associated DRESS carried HLA-A*32:01, compared to none of the matched control patients who received vancomycin for several weeks and did not develop a reaction to it.
By conducting a survival analysis of the BioVU patients with HLA-A*32:01 versus controls who did not carry the risk allele, the researchers determined that approximately 20 percent of patients who started vancomycin and who carried the HLA variant developed DRESS within four weeks.
In conjunction with this work, the group has developed a simple and inexpensive diagnostic test for HLA-A*32:01 that can be set up in routine diagnostic laboratories.
First author Katherine Konvinse, MS, a Vanderbilt MD/PhD student, led the laboratory work.
Other Vanderbilt contributors were Cosmin Bejan, PhD, Simon Mallal, MBBS, Mark Pilkinton, MD, PhD, Christian Shaffer, Katie White, MD, PhD, Kristina Williams, RN, CCRP, and Jeffrey Zwerner, MD, PhD.
Source: Vanderbilt University Medical Center
Dear Helpdesk: Working in a Toxic Health Care Environment
March 28th 2024Dear Helpdesk is your steadfast companion, offering life coaching and workplace advice from 2 seasoned IPs for some of your most challenging real-life situations. Let us help you navigate the intersection between work and life, guiding you to navigate the dynamic world of infection prevention with confidence and grace. This article is on handling a toxic health care environment.
Product Locator: Spring and Early Mother's Day Gift Guide for Infection Prevention Personnel
March 27th 2024Whether it's a spring holiday, birthdays, or no reason at all, infection prevention personnel love to give and receive gifts that help at the end of a stressful day. Infection Control Today® offers some gift ideas for infection prevention personnel and their families.
Catching Up With Vangie Dennis, AORN 2022-2023 President at AORN 2024
March 26th 2024Infection Control Today (ICT) had the privilege of catching up with Vangie Dennis, MSN, RN, CNOR, CMLSO, at the Association of periOperative Registered Nurses' (AORN’s) International Surgical Conference & Expo 2024. As the former president of AORN and an esteemed figure in perioperative services, Vangie Dennis shared insights into her recent endeavors and the exciting new chapter she's embarked upon.
How To Optimize Your Time Management Strategies for the Busy Infection Preventionist
March 25th 2024Is your calendar resembling a chaotic masterpiece of overlapping tasks? Join the club of infection preventionists striving to balance responsibilities. Dive into proven strategies from a fellow infection preventionist to reclaim control of your time, streamline tasks, and boost productivity effectively. This is an IP Lifeline article.