<?xml version="1.0" encoding="UTF-8"?><protocol_summary><protocol><id>15754</id><no>OPT-RATE-AF</no><status>Open (affiliates only)</status><title>Optimal pacing Rate for cardiac resynchronization therapy after&#xD;
atrioventricular node ablation in persistent Atrial Fibrillation and heart failure</title><sponsor_type>Institutional</sponsor_type><age_group>Adult</age_group><treatment_type>Treatment</treatment_type><disease_site>Atrial fibrillation</disease_site><PI>Thomaides, Athanasios</PI><institution>Medstar Southern Maryland Hospital Center; Medstar Washington Hospital Center : Jamal Smith</institution><item><contact_id>7058</contact_id><item_description>Jamal Smith</item_description><js_safe_str>Jamal Smith</js_safe_str><email>Jamal.D.Smith@medstar.net</email></item></protocol><sipVersion>2026.1.0 Build 16</sipVersion><copyright> &lt;a href="https://advarra.com" target="_blank"&gt;&amp;copy; 2026 Advarra, Inc.&lt;/a&gt; </copyright></protocol_summary>