Direct true lumen cannulation for type A aortic dissection (Samurai technique) in emergency scenarios

Abstract

Choosing the optimal arterial cannulation site in type A aortic dissection may be challenging. Aortic dissection is a dynamic condition that can change at any time. Thus all the alternatives available should be known by surgeons in order to adapt to the possible problems that may arise. In this video tutorial, we present a patient with acute type A aortic dissection who, after cardiopulmonary bypass with axillary arterial cannulation, developed a major complication: intraoperative malperfusion due to pressurization of the false lumen. The patient developed occlusion of the right coronary artery with electrocardiogram changes, inferior akinesia, and ventricular arrhythmias. Cerebral saturation was also significantly decreased. This scenario of acute malperfusion calls for immediate action. We proceeded to switch the cardiopulmonary bypass configuration from axillary to direct true lumen cannulation. This technique, also known as the Samurai technique, is feasible in most cases and advantageous in this emergency situation, allowing prompt reestablishment of adequate perfusion of the true lumen . Some authors even advocate more widespread use of this technique because it may ensure antegrade perfusion while avoiding progression of the dissection flap and reduce the rate of the most common complications of other cannulation sites such as plexus injury during axillary cannulation or cerebral embolization through mobilization of thrombi or calcification from femoral retrograde perfusion. This technique is useful in cases of circumferential dissection and in patients with relative contraindications for peripheral cannulation such as morbid obesity or peripheral arterial occlusion by atherosclerosis or by the dissection itself.

Keywords: Acute type A aortic dissection; Direct true lumen cannulation; Malperfusion; Samurai technique.