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We have developed a blood flow measurement system using Doppler ultrasound flow sensors fabricated of thin and flexible piezoelectric-polymer films. These flow sensors can be wrapped around a blood vessel and accurately measure flow. The innovation that makes this flow sensor possible is the diffraction-grating transducer. A conventional transducer produces(More)
PURPOSE To investigate the safety and effectiveness of a novel thrombolytic, alfimeprase, in catheter-directed thrombolysis (CDT) of acute peripheral arterial occlusions (PAO). METHODS Between April 2005 and March 2007, patients with acute PAO (Rutherford class I or IIa) of a lower extremity and onset of symptoms within 14 days prior to randomization were(More)
OBJECTIVE Reports of fatality following carbon dioxide digital subtraction angiography (CO2-DSA) have raised concerns regarding its safety. This study reviews the safety of CO2-DSA. DESIGN Single-institution retrospective review. SETTING Tertiary care teaching hospital in Los Angeles, California. PATIENTS A total of 951 patients who underwent 1007(More)
This work uses ultrasound signals to track the 3D location of a catheter. Our system provides 3D coordinate data and not images. The coordinates can be registered with preoperative, 3D CT image data to provide a “GPS” like navigation system for catheter based minimally invasive surgery. We used three ultrasound piston transducers as(More)
No standard presently exists for the use of systemic heparin during angioaccess surgery to decrease the incidence of postoperative thrombotic complications. Our objective was to study the effects of intraoperatively administered heparin on 30-day patency and postoperative bleeding complications in patients undergoing autogenous arteriovenous (AV) fistula(More)
Early hospital readmission among vascular surgery patients is a focus of Medicare's new reimbursement structure. We aim to identify factors associated with 30-day readmission after lower extremity interventions to treat peripheral artery disease (PAD). Retrospective analysis of 174 consecutive patients discharged from the vascular surgery service between(More)
OBJECTIVE The objective of this study was to describe the outcomes of patients with acute aortic syndrome (AAS) during and after transfer to a regional aortic center by a rapid transport system. METHODS Review of patients with AAS who were transferred by a rapid transport system to a regional aortic center was performed. Data regarding demographics,(More)
OBJECTIVE Image-guided surgery provides a mechanism to accurately and quickly assess the location of surgical tools relative to a preoperative image. Traditional image-guided surgery relies on infrared or radiofrequency triangulation to determine an instrument location relative to a preoperative image and has been primarily used in head and neck procedures.(More)
OBJECTIVE This study evaluated the correlation of ultrasound (US)-derived aortic aneurysm diameter measurements with centerline, three-dimensional (3-D) reconstruction computed tomography (CT) measurements after endovascular aortic aneurysm repair (EVAR). METHODS Concurrent CT and US examinations from 82 patients undergoing post-EVAR surveillance were(More)
OBJECTIVE In modern health care, vascular surgeons frequently serve as a unique resource to other surgical specialties for vascular exposure, repair, reconstruction, or control. These services occur both in planned and unplanned clinical settings. We analyzed the frequency, outcomes, and value of vascular services in this setting to other surgical(More)