Significant CIA ectasia or small aneurysm is often associated with AAA. In such cases, the bell-bottom procedure that preserves IIA circulation is a new alternative to the common practice of placement of endograft extensions across the iliac artery bifurcation in patients with at least one CIA diameter of less than 26 mm. Additional benefits include reduced total procedure time. Early technical success appears to justify continued use. However, long-term evaluation is necessary to determine durability because the risk of rupture as the result of potential expansion of the excluded iliac artery or late failure is unknown.
On the basis of the USI data alone, a prediction of arteriographic findings was possible at the 95% level for occlusion and severe stenosis and for ruling out hemodynamically significant stenosis. The addition of velocity data improved prediction in borderline degrees of stenosis. USI was effective for quantifying clinically significant degrees of stenosis.
Normal DUS imaging reliably identifies arteriographically normal carotid arteries after CAS. Carotid velocities are disproportionately elevated with mild and moderate degrees of stenoses, and velocity criteria for quantitating stenoses in these patients require modification. However, DUS appropriately identifies severe recurrent stenoses after CAS.
Historically, patients with mild to moderate neurologic deficits lasting longer than 24 hours were believed to have sustained a completed stroke. They were followed up for 4 to 6 weeks and cerebral angiography was performed if indicated. CT scanning has identified a subset of these patients who have sustained a reversible ischemic neurologic deficit (RIND) rather than a completed stroke. The timing for angiography and surgery for this group has not been established. In an earlier study we found that 21% (4 of 19 patients) suffered a second stroke during the 4- to 6-week waiting period. To avoid this high rate of recurrence, we instituted an aggressive program of CT scan evaluation and surgical therapy for all "stroke patients" with negative CT scans. Two hundred forty-five patients were seen with a persistent neurologic deficit between July 1980 and December 1983. These patients underwent CT scans 1 and 5 days after the initial event. Of these 245 patients, 171 patients (70%) were found to have negative CT scans. Appropriate carotid lesions were found by arteriography in 110 (64%) of the negative CT scan group. There were 61 (55%) men and 49 (45%) women in this group. Eighty-five patients (77%) had previous neurologic symptoms or a cerebrovascular accident. Hypertension was present in 52% and diabetes mellitus in 30%. All 110 patients underwent carotid endarterectomy within 14 days (mean 10 days) of the initial onset of their neurologic deficit; these were all done with shunt protection. No patient suffered another neurologic deficit in the same territory within 30 days after surgery.(ABSTRACT TRUNCATED AT 250 WORDS)
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