What did we learn from Riata™?

The Riata™ 8 French (Fr) and Riata ST™ 7 Fr families of silicone leads have experienced a specific form of insulation abrasion characterized by externalization of conductor cables outside the lead body. Design differences between the 8 Fr and 7 Fr leads make conductor externalization less likely in the smaller diameter lead. The Riata Lead Evaluation Study (RLES) reported on the prevalence of externalized conductors (EC) in patients implanted with Riata™ and Riata ST™ silicone leads and provided details on the incidence of electrical abnormalities in Riata™ and Riata ST™ leads with and without EC. The prevalence of EC was significantly lower for the Riata ST™ leads (7 Fr) as compared with Riata™ leads (8 Fr) (24/259 (9.3 %) vs. 125/517 (24.2 %), P < 0.001), and the majority of leads with EC were not associated with electrical malfunction. The aim of this manuscript is to describe the design of the Riata™ and Riata ST™ families of leads, provide details regarding the mechanisms and rates of lead failure, and discuss recommendations for patient management.