Adenosine-Induced Transient Cardiac Asystole Enhances Precise Deployment of Stent-Grafts in the Thoracic or Abdominal Aorta

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Abstract
To present a cardiac asystole technique that assists in the accurate deployment of stent-grafts during endovascular repair of thoracic or abdominal aortic aneurysms. In the anesthetized patient, trial doses of intravenous adenosine are delivered until a > or = 20-second period of asystole is recorded. The endograft procedure then proceeds until the device is ready for deployment. The predetermined dose of adenosine is administered, and the device is deployed during asystole. Adenosine-induced transient asystole has been utilized in 16 patients undergoing balloon-expandable endograft exclusion of 6 thoracic aortic and 10 abdominal aortic aneurysms. Asystole lasted for 20 to 30 seconds, during which time the devices were accurately deployed without interference from the aortic flow. There were no clinical sequelae of this technique in any patient. Pharmacologically induced transient asystole appears to be a safe maneuver to preclude endograft movement by systolic blood flow. The technique permits precise placement of balloon-expandable stent-grafts and is applicable to self-expanding devices as well. Interventionists may wish to incorporate adenosine-induced asystole into their aortic aneurysm exclusion procedures.