Identification of Stevens–Johnson syndrome and toxic epidermal necrolysis in electronic health record databases1. (24th April 2015)

• Record Type: Journal Article
• Authors: Davis, Robert L.; Gallagher, Mia A.; Asgari, Maryam M.; Eide, Melody J.; Margolis, David J.; Macy, Eric; Burmester, James K.; Selvam, Nandini; Boscarino, Joseph A.; Cromwell, Lee F.; Feigelson, Heather S.; Kuntz, Jennifer L.; Pawloski, Pamala A.; Penfold, Robert B.; Raebel, Marsha A.; Sridhar, Gayathri; Wu, Ann; La Grenade, Lois A.; Pacanowski, Michael A.; Pinheiro, Simone P.
• Is Part Of: Pharmacoepidemiology and drug safety. Volume 24:Number 7(2015:Jul.)
• Page Start: 684
• Page End: 692
• Publication Date: 2015-04-24
• Subjects: Pharmacoepidemiology -- Periodicals; Chemotherapy -- Periodicals; Epidemiology -- Periodicals; 615.705
• DOI: 10.1002/pds.3778
• Languages: English
• ISSNs: 1053-8569

Abstract

<abstract abstract-type="main"> <title>Abstract</title> <sec id="pds3778-sec-0001" sec-type="section"> <title>Background</title> <p>Stevens–Johnson syndrome (SJS) and toxic epidermal necrolysis (TEN) carry a high mortality risk. While identifying clinical and genetic risk factors for these conditions has been hindered by their rarity, large electronic health databases hold promise for identifying large numbers of cases for study, especially with the introduction in 2008 of ICD‐9 codes more specific for these conditions.</p> </sec> <sec id="pds3778-sec-0002" sec-type="section"> <title>Objective</title> <p>The objective of this study is to estimate the validity of ICD‐9 codes for ascertaining SJS/TEN in 12 collaborating research units in the USA, covering almost 60 million lives.</p> </sec> <sec id="pds3778-sec-0003" sec-type="section"> <title>Methods</title> <p>From the electronic databases at each site, we ascertained potential cases of SJS/TEN using ICD‐9 codes. At five sites, a subset of medical records was abstracted and standardized criteria applied by board‐certified dermatologists to adjudicate diagnoses. Multivariate logistic regression was used to identify factors independently associated with validated SJS/TEN cases.</p> </sec> <sec id="pds3778-sec-0004" sec-type="section"> <title>Results</title> <p>A total of 56 591 potential cases of SJS/TEN were identified. A subset of 276 charts was selected for adjudication and 39 (of the 276) were confirmed as SJS/TEN. Patients with the ICD‐9 codes introduced after 2008 were more likely to be confirmed as cases (OR 3.32; 95%CI 0.82, 13.47) than those identified in earlier years. Likelihood of case status increased with length of hospitalization. Applying the probability of case status to the 56 591 potential cases, we estimated 475–875 to be valid SJS/TEN cases.</p> </sec> <sec id="pds3778-sec-0005" sec-type="section"> <title>Conclusion</title> <p>Newer ICD‐9 codes, along with length of hospitalization, identified patients with a high likelihood of SJS/TEN. This is important for identification of subjects for future pharmacogenomics studies. Copyright © 2015 John Wiley & Sons, Ltd.</p> </sec> </abstract>