NR ATBX
AU de Pedro Cuesta,J.; Bleda,M.J.; Rabano,A.; Cruz,M.; Laursen,H.; Molbak,K.; Siden,A.
TI Classification of surgical procedures for epidemiologic assessment of sporadic Creutzfeldt-Jakob disease transmission by surgery
QU European Journal of Epidemiology 2006; 21(8): 595-604
PT journal article; research support, non-u.s. gov't
AB BACKGROUND: In this preparatory phase of a case-control study, we propose and evaluate a new tool for classifying surgical procedures (SPs) in categories useful for epidemiologic research on surgical transmission of sporadic Creutzfeldt-Jakob disease (sCJD). METHODS: All SPs reported to the Swedish National Hospital Discharge Registry in the period 1974-2002, and undergone by 212 Swedish patients with registered diagnosis of CJD at death, hospital discharge or notification, in the period 1987-2002, 1060 age-, sex- and residence-matched controls and 1340 randomly chosen population controls, were reclassified into one of six categories of hypothetical transmission risk level. For that purpose the following two attributes were used: non-disposable instruments involved; and highest assigned ad-hoc risk level for four tissues or anatomical structures contacting such instruments. RESULTS: A total of 1170 different SP codes were reclassified as follows: 3.1% in the high-risk, 59.1% in the lower-risk, 24.4% in the lowest-risk, and 2.1% in the no-risk groups, with 11.3% procedures negatively defined by rubric as "other than..." being assigned to two spurious diluted-high and diluted-lower risk categories. The high-risk group mainly comprised neurosurgical (53%) and ophthalmic (39%) procedures. Sensitivity of neurosurgery and of ophthalmic surgery excluding neurosurgery, for the high- and diluted-high risk vs. other categories was 46% and 84%, while specificity was 98% and 95%, respectively. Sensitivity analysis based on these indices revealed that non-significant odds ratio effects of 1.4 and 1.3 for neurosurgery and ophthalmic surgery corresponded to statistically significant values of 5.1 after reclassification. CONCLUSIONS: This classification might contribute to quantify effects masked by use of body-system SP-categories in case-control studies on sCJD transmission by surgery.
MH Case-Control Studies; Creutzfeldt-Jakob Syndrome/*epidemiology/etiology/*transmission; Humans; Risk Assessment; Risk Factors; Surgical Instruments; Surgical Procedures, Operative/*adverse effects/*classification/methods
AD Department of Applied Epidemiology, National Center for Epidemiology, Carlos III Institute of Health, C/Sinesio Delgado 6, 28029 Madrid, Spain. jpedro@isciii.es
SP englisch
PO Niederlande