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Acute Aortic Disease.. - Index of

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Endovascular Thoracic <strong>Aortic</strong> Stent Grafting 293<br />

use <strong>of</strong> neurophysiological monitoring in endovascular treatment <strong>of</strong> the thoracic<br />

aorta has been reported to also allow early detection and intervention to augment<br />

spinal cord perfusion pressure to decrease the risk (94). A proposed algorithm to<br />

manage the risk <strong>of</strong> spinal cord ischemia is demonstrated in Figure 12.<br />

The risk <strong>of</strong> stroke in endovascular repair is approximately 3% to 9%, which<br />

is similar to open repair (95). Therefore, stroke rates are 2–3 × higher than paraplegia<br />

rates for thoracic endografting. There are several possible reasons for this high<br />

stroke risk. Endovascular placement <strong>of</strong> thoracic aortic stent grafts requires multiple<br />

Figure 12 Proposed algorithm to manage the risk <strong>of</strong> spinal cord ischemia in patients undergoing<br />

endovascular stent repair <strong>of</strong> descending thoracic aortic aneurysms. Abbreviations:<br />

AAA, abdominal aortic aneurysm; CSF, cerebrospinal fluid; LE, lower extremity; MAP,<br />

mean arterial pressure; Rx, drug therapy; SEP, somatosensory evoked potential. Source:<br />

From Ref. 84.

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