{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,8,27]],"date-time":"2026-08-27T01:08:59Z","timestamp":1787792939386,"version":"build-2784847793"},"reference-count":25,"publisher":"Wiley","issue":"9","license":[{"start":{"date-parts":[[2009,8,26]],"date-time":"2009-08-26T00:00:00Z","timestamp":1251244800000},"content-version":"vor","delay-in-days":0,"URL":"http:\/\/onlinelibrary.wiley.com\/termsAndConditions#vor"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Pacing Clinical Electrophis"],"published-print":{"date-parts":[[2009,9]]},"abstract":"<jats:p> <jats:italic>\n            <jats:bold>Aim:<\/jats:bold> We performed a two\u2010year follow\u2010up comparative study of long\u2010term electrical parameters between the right atrial appendage (RAA) and Bachmann's Bundle (BB) stimulation in myotonic dystrophy type 1 (MD1) patients.<\/jats:italic> <\/jats:p><jats:p> <jats:italic>\n            <jats:bold>Methods:<\/jats:bold> Twenty\u2010five MD1 patients (18 men; age: 54 \u00b1 13 years) with no difference in the electrical parameters between the RAA site and the BB region at implantation were randomized into two groups: in group I (13 patients; age: 52 \u00b1 14 years; four women) the atrial lead was placed in the RAA and in group II (12 patients, age: 56 \u00b1 12 years, three women) the lead was placed in the BB region. Measurements of electrical parameters were recorded at follow\u2010up intervals of 6 weeks and then 12 and 24 months postimplant.<\/jats:italic> <\/jats:p><jats:p> <jats:italic>\n            <jats:bold>Results:<\/jats:bold> There was no statistically significant different in P\u2010wave amplitude, pacing threshold, and impedance values between the two groups at 6 weeks. At 24 months follow\u2010up, the intrinsic P\u2010wave amplitude was 2.05 \u00b1 1.45 mV in the RAA group versus 3.28 \u00b1 1.09 mV in the BB group (P &lt; 0.05); the pacing threshold was 1.85 \u00b1 1.8 V in the RAA group versus 0.50 \u00b1 0.39 V in the BB group (P = 0.03); there were no differences in the atrial impedance between the two groups during the follow\u2010up period.<\/jats:italic> <\/jats:p><jats:p> <jats:italic>\n            <jats:bold>Conclusions:<\/jats:bold> In a direct two\u2010year follow\u2010up comparison between the RAA and BB atrial pacing sites, we showed a statistically significant increased pacing threshold and decreased intrinsic P\u2010wave amplitude during RAA stimulation in MD1 patients.<\/jats:italic> 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