Publications (2)3.84 Total impact
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Article: Computed tomography versus color duplex ultrasound for surveillance of abdominal aortic stent-grafts.
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ABSTRACT: To compare the ability of computed tomography (CT) and color duplex ultrasound (CDUS) to detect endoleak and accurately measure aortic aneurysm diameters after endovascular repair. Between February 2000 and October 2004, 178 consecutive patients (156 men; mean age 74 years, range 49-89) were treated with aortic stent-grafts (86 Ancure, 55 AneuRx, and 37 Excluder). The follow-up protocol included serial CT and CDUS at 1 month and every 6 months thereafter. Sensitivity, specificity, positive predictive value, negative predictive value, and Kappa statistics (kappa) were calculated using CT as the gold standard; Bland-Altman analysis was used to determine the 95% limits of agreement. Paired and unpaired t tests and correlation coefficients were used to compare the methods. Follow-up ranged from 1 to 53 months (mean 16), during which 367 paired CT and CDUS studies were acquired. The mean diameter of the AAA sac after repair was 5.15 cm by CT versus 4.99 cm by CDUS (p=0.07); 93% of paired studies were somewhat similar (<or=5 mm). Mean pre to postoperative AAA size changes throughout follow-up were -0.60 mm for CT versus -0.58 mm for CDUS (p=0.78). Thirty-four (19%) endoleaks were detected (26 early and 8 late). Versus CT, the sensitivity, specificity, positive predictive value, and negative predictive value of CDUS for detecting endoleaks were 68%, 99%, 85%, and 97%, respectively (kappa=0.73). CDUS was more accurate in detecting type I endoleak than type II (88% versus 50%, p=0.046). Although CDUS has good correlation to CT in measuring the size of AAAs, it has a lower sensitivity in detecting endoleak, particularly type II. Therefore, CT scans should remain the primary imaging modality for the diagnosis of endoleak.Journal of Endovascular Therapy 10/2005; 12(5):568-73. · 2.86 Impact Factor -
Article: Complications of diagnostic carotid/cerebral arteriography when performed by a vascular surgeon.
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ABSTRACT: Carotid stenting has recently been considered as an alternative treatment to carotid endarterectomy for certain patients with carotid stenosis. Hence, performing carotid arteriography with minimal morbidity and mortality is essential. The purpose of this study was to audit complications of diagnostic carotid/cerebral arteriography performed by a vascular surgeon with experience in endovascular interventions. One hundred one consecutive patients underwent 4-vessel arch aortography with selective carotid, subclavian, and/or vertebral arteriography with use of the Seldinger technique. Demographic data, indications, procedure approach (transfemoral, brachial), number of arteries punctured, type of selective injection, contrast volume, and procedure time were analyzed. Minor complications were those that do not significantly alter the health or activity of the patient or require extra hospitalization or treatment. Other complications were defined as major complications. The technical success rate was 99% (100/101 patients). These included the following: 82 patients with right carotid artery, 82 with left carotid artery, 15 with right subclavian artery, 21 with left subclavian artery, 11 with right vertebral artery, and 17 with left vertebral artery (a total of 228 selective injections). Indications for procedures included the following: transient ischemic attack (TIA)/stroke symptoms in 66%, asymptomatic carotid stenosis in 22%, upper limb claudication in 4%, and vertebrobasilar insufficiency in 4%. Right femoral puncture was used in 79%, left femoral in 12%, and left brachial in 9%. The mean amount of contrast used was 101 cc (45-250 cc) and the mean procedure time was 46 minutes (22-132 minutes). There were 5 complications in the whole series: 3 major complications (3%), including 1 minor stroke (1%) with carotid injection, 1 TIA, and 1 major retroperitoneal bleeding; and 2 (2%) minor complications. The major complication rate in this series compares favorably to published rates of 5.7% to 9.1%. There was no association between complications and specific risk factors except for a longer catheterization time (66 minutes versus 45 minutes, p=0.011). Carotid/cerebral arteriography can be done safely by experienced vascular surgeons with minimal perioperative complications that compare favorably with what has been reported in the radiology literature.Vascular and Endovascular Surgery 40(3):189-95. · 0.99 Impact Factor
