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change into a duplex
(used technically of a device or process) having two parts; "a duplex transaction"
allowing communication in opposite directions simultaneously; "duplex system"; "duplex telephony"

PrepTutorEJDIC

2倍の,2重の,複式の / =duplex apartment
(音楽が)2拍子の,偶数拍子の

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出典(authority):フリー百科事典『ウィキペディア（Wikipedia）』「2013/12/16 02:15:38」(JST)

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Duplex ultrasonography (more commonly but less correctly known as duplex ultrasound) is a form of medical ultrasonography that incorporates two elements:

Grayscale Ultrasound to visualize the structure or architecture of the body part. No motion or bloodflow is assessed. This is the way plaque is directly imaged in a blood vessel, with the reader typically commenting on crossectional narrowing (greater than 70% is typically considered worthy of treatment).

Color-doppler Ultrasound to visualize the flow or movement of a structure, typically used to image blood within an artery. Blood flow velocities increase through a region of narrowing, like a finger pressing up against the end of a running garden hose. Increased velocities indicate a region of narrowing or resistance (velocities greater than 250 cm/s typically considered worthy of treatment).

Both displays are presented on the same screen ("duplex") to facilitate interpretation.

Vascular ultrasonography[edit]

Vascular ultrasonography is the main branch of radiology that uses duplex. Vascular ultrasonography, a subspeciality within ultrasonography, helps determine multiple factors within the circulatory system. It can evaluate central (abdominal) and peripheral arteries and veins; it helps determine the amount of vascular stenosis (narrowing) or occlusion (complete blockage) within an artery; it assists in ruling out aneurysmal disease; and it is the main aid to rule out thrombotic events. Duplex is an inexpensive, non-invasive way to determine pathology. Duplex evaluation is usually done prior to any invasive testing or surgical procedure.^[1] Ultrasound duplex scanning can provide additional information that may guide therapeutic decisions. The location and severity of arterial narrowings and occlusions can be identified. The vascular technologist can map disease in lower-extremity segments with great accuracy — though duplex scanning is more time-consuming than other lower-extremity arterial studies.

References[edit]

^ Robert A. Weiss, Craig Feied, Margaret A. Weiss (2001). Vein Diagnosis and Treatment: A Comprehensive Approach. McGraw-Hill Professional. ISBN 0-07-069201-7.

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English Journal

Renal artery duplex ultrasound criteria for the detection of significant in-stent restenosis.

Del Conde I1, Galin ID, Trost B, Kang J, Lookstein R, Woodward M, Gustavson S, Cambria RP, Jaff MR, Olin JW.Author information 1Zena and Michael A. Wiener Cardiovascular Institute and Marie-Josée and Henry R. Kravis Center for Cardiovascular Health, Icahn School of Medicine at Mount Sinai, New York, New York.AbstractOBJECTIVES: To define velocity criteria by ultrasonography for the detection of hemodynamically significant (>60%) renal artery in-stent restenosis (ISR).
Catheterization and cardiovascular interventions : official journal of the Society for Cardiac Angiography & Interventions.Catheter Cardiovasc Interv.2014 Mar 1;83(4):612-8. doi: 10.1002/ccd.25270. Epub 2013 Nov 14.
OBJECTIVES: To define velocity criteria by ultrasonography for the detection of hemodynamically significant (>60%) renal artery in-stent restenosis (ISR).BACKGROUND: The restenosis rate after renal artery stenting ranges between 10% and 20%. While duplex ultrasound criteria have been validated fo
PMID 24155154

Impact of contralateral carotid or vertebral artery occlusion in patients undergoing carotid endarterectomy or carotid artery stenting.

Yang SS1, Kim YW2, Kim DI1, Kim KH3, Jeon P3, Kim GM4, Chung CS4, Lee KH4.Author information 1Division of Vascular Surgery, Department of Surgery, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, South Korea.2Division of Vascular Surgery, Department of Surgery, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, South Korea. Electronic address: ywkim@skku.edu.3Department of Radiology, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, South Korea.4Department of Neurology, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, South Korea.AbstractOBJECTIVE: To determine the impact of contralateral carotid occlusion (CCO) and/or vertebral artery occlusion (VAO) on the development of early postoperative neurologic complications after carotid endarterectomy (CEA) or carotid artery stenting (CAS).
Journal of vascular surgery.J Vasc Surg.2014 Mar;59(3):749-55. doi: 10.1016/j.jvs.2013.10.055. Epub 2013 Dec 19.
OBJECTIVE: To determine the impact of contralateral carotid occlusion (CCO) and/or vertebral artery occlusion (VAO) on the development of early postoperative neurologic complications after carotid endarterectomy (CEA) or carotid artery stenting (CAS).METHODS: A retrospective analysis was conducted u
PMID 24360588

Renal blood flow before and after portosystemic shunt in children with portal hypertension.

Aliev MM1, Yuldashev RZ, Adilova GS, Yusupaileva GA.Author information 1Department of Pediatric Surgery, Tashkent Pediatric Medical Institute, Tashkent, Uzbekistan.AbstractINTRODUCTION: Variceal haemorrhage in children with extrahepatic portal hypertension is best controlled by an effective decompressive shunt, but long-term follow up of children who have had splenorenal shunt due to extrahepatic portal hypertension (EHPH) gave evidence for assuming the risk of renal venous hypertension (RVH).
Pediatric surgery international.Pediatr Surg Int.2014 Mar;30(3):295-9. doi: 10.1007/s00383-014-3463-4.
INTRODUCTION: Variceal haemorrhage in children with extrahepatic portal hypertension is best controlled by an effective decompressive shunt, but long-term follow up of children who have had splenorenal shunt due to extrahepatic portal hypertension (EHPH) gave evidence for assuming the risk of renal
PMID 24448909

Japanese Journal

Portal hemodynamic effects of sorafenib in patients with advanced hepatocellular carcinoma : a prospective cohort study

HIDAKA Hisashi,NAKAZAWA Takahide,KANEKO Toru,MINAMINO Tsutomu,TAKADA Juichi,TANAKA Yoshiaki,OKUWAKI Yusuke,WATANABE Masaaki,SHIBUYA Akitaka,KOIZUMI Wasaburo
Journal of gastroenterology 47(9), 1030-1035, 2012-09-01
NAID 10031122090

Prospective randomized comparative study of visual foam sclerotherapy alone or in combination with ultrasound-guided foam sclerotherapy for treatment of superficial venous insufficiency: Preliminary report.

YAMAKI Takashi,HAMAHATA Atsumori,SOEJIMA Kazutaka,KONO Taro,NOZAKI Motohiro,SAKURAI Hiroyuki
European journal of vascular and endovascular surgery 43(3), 343-347, 2012-03-00
… Assessments included duplex ultrasonography, evaluation of Venous Clinical Severity Scores (VCSS) and CEAP (clinical, etiologic, anatomic, and pathophysiologic) scores. …
NAID 120005262902

大伏在静脈大腿静脈接合部破格例の検討

猪狩公宏,広川雅之,内山英俊,豊福崇浩,工藤敏文,地引政利,栗原伸久,井上芳徳
静脈学 23(1), 25-29, 2012-02-25
… Patients and Methods: Between April 2005 and March 2010, 2,552 limbs of 1,563 patients with complaints of varicose veins underwent ultrasonography. … Ultrasonography was used to identify the anatomical variation of the SFJ, especially the relationship to the femoral artery. … Conclusions: It is important to investigate the anomaly of the SFJ using preoperative duplex ultrasound, although its incidence is lower than that of the sapheno-popliteal junction. …
NAID 10030353095