1
|
Allan RB, Wise NC, Wong YT, Delaney CL. Accuracy and Reliability of Peripheral Artery Calcium Scoring Systems Using an Intravascular Ultrasound Reference Standard. Ann Vasc Surg 2023; 91:233-241. [PMID: 36481677 DOI: 10.1016/j.avsg.2022.11.014] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/16/2022] [Revised: 11/07/2022] [Accepted: 11/09/2022] [Indexed: 12/12/2022]
Abstract
BACKGROUND Peripheral artery calcium scoring systems are commonly used in clinical trials to categorize calcium severity but there are little data on their accuracy and reliability. The purpose of this study was to investigate the accuracy and reliability of these systems. METHODS Angiographic, computed tomography angiography, and intravascular ultrasound (IVUS) imaging were obtained from 47 consecutive cases sourced from a prospectively collected database of patients undergoing femoropopliteal artery endovascular intervention. Two independent blinded readers graded calcium severity using the Peripheral Arterial Calcium Scoring System, Peripheral Academic Research Consortium, and Fanelli calcium scoring systems. IVUS maximum arc of calcium and calcium length were compared between severity grades for each scoring system. The diagnostic accuracy of each scoring system for identifying severe calcium was calculated using the reference standard of an IVUS maximum calcium arc ≥ 180°. Agreement testing was performed between scoring systems and between and within observers for each system. RESULTS IVUS identified calcium in 85% (42/47) of cases, compared to 68% (32/47) of cases with angiography. There were no differences in IVUS calcium parameters between grades of calcium for any of the scoring systems. Severe calcium was detected by IVUS in 30 cases, in 23 cases by Peripheral Arterial Calcium Scoring System (sensitivity: 73%, specificity: 33%, positive predictive value [PPV]: 83%, negative predictive value [NPV]: 22%), in 12 cases by Peripheral Academic Research Consortium (sensitivity: 42%, specificity: 83%, PPV: 92%, NPV: 25%), and in 10 cases by Fanelli (sensitivity: 39%, specificity: 100%, PPV: 100%, NPV: 27%). Agreement between scoring systems was weak to moderate (range: k = 0.55-0.74). Interobserver agreement was weak (k = 0.41-0.54) and intraobserver agreement was highly variable ranging from k = 0.41 to k = 0.92. CONCLUSIONS The poor diagnostic accuracy and weak-to-moderate reliability of calcium scoring systems raise doubts about the use of current calcium scoring systems for use in clinical trials.
Collapse
Affiliation(s)
- Richard B Allan
- Department of Vascular and Endovascular Surgery, Flinders Medical Centre, Bedford Park, South Australia, Australia; College of Medicine and Public Health, Flinders University, Adelaide, South Australia, Australia.
| | - Nadia C Wise
- Department of Vascular and Endovascular Surgery, Flinders Medical Centre, Bedford Park, South Australia, Australia; College of Medicine and Public Health, Flinders University, Adelaide, South Australia, Australia
| | - Yew Toh Wong
- Department of Vascular and Endovascular Surgery, Flinders Medical Centre, Bedford Park, South Australia, Australia; Department of Vascular Surgery, Royal Adelaide Hospital, Adelaide, South Australia, Australia
| | - Christopher L Delaney
- Department of Vascular and Endovascular Surgery, Flinders Medical Centre, Bedford Park, South Australia, Australia; College of Medicine and Public Health, Flinders University, Adelaide, South Australia, Australia
| |
Collapse
|
2
|
Mosarla RC, Armstrong E, Bitton-Faiwiszewski Y, Schneider PA, Secemsky EA. State-of-the-Art Endovascular Therapies for the Femoropopliteal Segment: Are We There Yet? JOURNAL OF THE SOCIETY FOR CARDIOVASCULAR ANGIOGRAPHY & INTERVENTIONS 2022; 1. [PMID: 36268042 PMCID: PMC9581461 DOI: 10.1016/j.jscai.2022.100439] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 12/02/2022]
Abstract
Peripheral arterial disease is an increasingly prevalent condition with significant associated morbidity, mortality, and health care expenditure. Endovascular interventions are appropriate for most patients with either ongoing symptoms of intermittent claudication despite lifestyle and medical optimization or chronic limb-threatening ischemia. The femoropopliteal segment is the most common arterial culprit responsible for claudication and the most commonly revascularized segment. Endovascular approaches to revascularization of the femoropopliteal segment are advancing with an evolving landscape of techniques for arterial access, device-based therapies, vessel preparation, and intraprocedural imaging. These advances have been marked by debate and controversy, notably related to the safety of paclitaxel-based devices and necessity of atherectomy. In this review, we provide a critical overview of the current evidence, practice patterns, emerging evidence, and technological advances for endovascular intervention of the femoropopliteal arterial segment.
Collapse
Affiliation(s)
| | - Ehrin Armstrong
- Adventist Heart and Vascular Institute, St Helena, California
| | | | | | - Eric A. Secemsky
- Harvard Medical School, Boston, Massachusetts
- Richard A. and Susan F. Smith Center for Outcomes Research in Cardiology, Department of Medicine, Beth Israel Deaconess Medical Center, Boston, Massachusetts
- Corresponding author: (E.A. Secemsky)
| |
Collapse
|
3
|
Natesan S, Mosarla RC, Parikh SA, Rosenfield K, Suomi J, Chalyan D, Jaff M, Secemsky EA. Intravascular ultrasound in peripheral venous and arterial interventions: A contemporary systematic review and grading of the quality of evidence. Vasc Med 2022; 27:392-400. [PMID: 35546056 DOI: 10.1177/1358863x221092817] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Although angiography has been the primary imaging modality used in peripheral vascular intervention, this technique has major limitations due to the evaluation of three-dimensional vessels in two dimensions. Intravascular ultrasound (IVUS) is an important adjunctive tool that can address some of these limitations. This systematic review assesses the appropriateness of IVUS as an imaging modality for guiding peripheral intervention through evidence collection and clinical appraisal of studies. Following the Preferred Reporting Items for Systematic Reviews and Meta-Analyses (PRISMA) guidelines, a cohort of 48 studies (29 arterial; 19 venous) detailing IVUS use in peripheral vascular intervention were extracted. Qualitative assessment of the studies evaluated pre- and postprocedure efficacy of IVUS and revealed that IVUS-guided peripheral intervention in arterial and venous diagnosis and treatment was superior to other imaging techniques alone. Each study in the cohort was further assessed for reliability and validity using the Oxford Centre for Evidence Based Medicine (CEBM) level of evidence scale. The majority of both arterial (79.3%) and venous (73.7%) studies received a 2b rating, the second highest level of evidence rating. The evidence to date indicates that IVUS results in better clinical outcomes overall and should be more widely adopted as an adjunctive imaging modality during peripheral intervention. (PROSPERO Registration No.: CRD42021232353).
Collapse
Affiliation(s)
- Sahana Natesan
- Richard A and Susan F Smith Center for Outcomes Research in Cardiology, Beth Israel Deaconess Medical Center, Boston, MA, USA
| | - Ramya C Mosarla
- Division of Cardiology, New York University Grossman School of Medicine, New York, NY, USA
| | - Sahil A Parikh
- Department of Medicine, Center for Interventional Vascular Therapy and Division of Cardiology, Columbia University Medical Center, New York, NY, USA
| | | | - Joanna Suomi
- Richard A and Susan F Smith Center for Outcomes Research in Cardiology, Beth Israel Deaconess Medical Center, Boston, MA, USA.,Independent Medical Writer
| | - David Chalyan
- Department of Radiological Sciences, University of California-Irvine, Irvine, CA, USA
| | - Michael Jaff
- Boston Scientific Corporation, Marlborough, MA, USA.,Harvard Medical School, Boston, MA, USA
| | - Eric A Secemsky
- Richard A and Susan F Smith Center for Outcomes Research in Cardiology, Beth Israel Deaconess Medical Center, Boston, MA, USA.,Harvard Medical School, Boston, MA, USA.,Division of Cardiology, Department of Medicine, Beth Israel Deaconess Medical Center, Boston, MA, USA
| |
Collapse
|
4
|
The Impact of Intravascular Ultrasound on Femoropopliteal Artery Endovascular Interventions: A Randomized Controlled Trial. JACC Cardiovasc Interv 2022; 15:536-546. [PMID: 35272779 DOI: 10.1016/j.jcin.2022.01.001] [Citation(s) in RCA: 29] [Impact Index Per Article: 14.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/19/2021] [Revised: 12/15/2021] [Accepted: 01/04/2022] [Indexed: 12/14/2022]
Abstract
OBJECTIVES The aim of this study was to investigate whether the addition of intravascular ultrasound (IVUS) guidance during femoropopliteal artery interventions reduced the rate of binary restenosis within 12 months compared with angiographic guidance alone. BACKGROUND IVUS is more accurate than angiography for assessment of vessel size and disease severity. Low-level studies suggest that the use of IVUS in femoropopliteal endovascular interventions improves outcomes, but currently, no level 1 evidence exists. METHODS This was a prospective single-center trial of 150 patients undergoing femoropopliteal endovascular intervention, randomized (1:1) to guidance by angiography or angiography and IVUS. The primary outcome measure was freedom from binary restenosis, on duplex ultrasound, within 12 months. Secondary outcomes included clinically driven target lesion revascularization, disagreements in imaging findings between modalities, and changes in treatment caused by IVUS. RESULTS Freedom from binary restenosis at 12 months was significantly higher in the IVUS group (72.4% vs 55.4%; P = 0.008). There was no significant difference between groups for clinically directed target lesion revascularization (84.2% and 82.4%; P = 0.776). Mean vessel diameter was significantly larger with IVUS (5.60 mm vs 5.10 mm; P < 0.001). A change in treatment occurred caused by IVUS in 79% of cases. Binary restenosis was lower in the IVUS group for cases treated with drug-coated balloons (9.1% vs 37.5%; P = 0.001). CONCLUSIONS The use of IVUS resulted in a significant reduction in the rate of restenosis after endovascular intervention. This is the first randomized controlled trial to demonstrate that IVUS improves outcomes in femoropopliteal interventions. This benefit may primarily relate to cases treated with drug-coated balloons. (Does the use of intravascular ultrasound improve outcomes of endovascular interventional procedures for peripheral vascular disease of the superficial femoral artery or popliteal artery?; ACTRN12614000006640).
Collapse
|
5
|
Allan RB, Wise NC, Wong YT, Delaney CL. Comparison of Angiographic Dissection Classification Systems in the Femoropopliteal Arteries Using IVUS Validation and Reliability Testing. J Endovasc Ther 2021; 29:193-203. [PMID: 34609223 DOI: 10.1177/15266028211047952] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
PURPOSE Objective assessment of dissection severity is difficult. Recognition of this has led to the creation of classification systems. This study investigated the performance of the National Heart Lung and Blood Institute (NHLBI) and Kobayashi systems at differentiating severity of femoropopliteal dissection using intravascular ultrasound (IVUS) as the reference standard. Comparison between the 2 systems and the inter- and intra-observer reliability were also investigated. MATERIALS AND METHODS Angiographic and IVUS imaging was assessed in 51 cases sourced from a RCT investigating the use of IVUS in femoropopliteal disease. A total of 2 readers independently scored the angiography images according to NHLBI and Kobayashi dissection classification systems and a consensus score was obtained for each system in each case. The NHLBI classification was condensed into 3 grades of dissection to allow comparison between systems. Dissection length, dissection arc, minimum lumen area, and lumen area stenosis were obtained from the IVUS imaging. IVUS parameters were compared between grades of severity for both systems. Agreement in grading between the systems was assessed and IVUS parameters for each level of dissection severity were compared between systems. Inter and intra-observer agreement tested for each system. RESULTS Dissection was present on IVUS in 92.2% (47/51) of cases and angiography identified 78.7% (37/47) of these. No difference was present in any IVUS parameters between mild and severe dissections with either classification system. No difference in IVUS findings was present for the same grades of dissection between systems. The 2 systems agreed on severity grade in 47 of 51 cases. The inter-observer agreement was for NHLBI was k=0.549 and k=0.627 for Kobayashi. Intra-observer agreement for NHLBI was k=0.633 and k=0.633 and for Kobayashi was k=0.657 and k=0.297. CONCLUSION The lack of difference in IVUS parameters between mild and severe dissection for the NHLBI and Kobayashi systems raises doubts about their ability to effectively differentiate dissection severity. Weak to moderate reliability suggests that variability in interpreting dissection may be higher than acceptable. IVUS imaging is more sensitive for detecting dissection than angiography and research is required to establish the value of adding IVUS to dissection classification systems.
Collapse
Affiliation(s)
- Richard Barry Allan
- Department of Vascular and Endovascular Surgery, Flinders Medical Centre, Bedford Park, SA, Australia.,College of Medicine and Public Health, Flinders University, Adelaide, SA, Australia
| | - Nadia Clare Wise
- Department of Vascular and Endovascular Surgery, Flinders Medical Centre, Bedford Park, SA, Australia.,College of Medicine and Public Health, Flinders University, Adelaide, SA, Australia
| | - Yew Toh Wong
- Department of Vascular and Endovascular Surgery, Flinders Medical Centre, Bedford Park, SA, Australia.,College of Medicine and Public Health, Flinders University, Adelaide, SA, Australia
| | - Christopher Luke Delaney
- Department of Vascular and Endovascular Surgery, Flinders Medical Centre, Bedford Park, SA, Australia.,College of Medicine and Public Health, Flinders University, Adelaide, SA, Australia
| |
Collapse
|
6
|
Nair PK, Carr JG, Bigelow B, Bhatt DL, Berwick ZC, Adams G. LumenRECON Guidewire: Pilot Study of a Novel, Nonimaging Technology for Accurate Vessel Sizing and Delivery of Therapy in Femoropopliteal Disease. Circ Cardiovasc Interv 2018; 11:e005333. [PMID: 29311285 DOI: 10.1161/circinterventions.117.005333] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/24/2017] [Accepted: 12/07/2017] [Indexed: 11/16/2022]
Abstract
BACKGROUND Proper vessel sizing during endovascular interventions is crucial to avoid adverse procedural and clinical outcomes. LumenRECON (LR) is a novel, nonimaging, 0.035-inch wire-based technology that uses the physics-based principle of Ohm's law to provide a simple, real-time luminal size while also providing a platform for therapy delivery. This study evaluated the accuracy, reliability, and safety of the LR system in patients presenting for a femoropopliteal artery intervention. METHODS AND RESULTS This multicenter, prospective pilot study of 24 patients presenting for peripheral intervention compared LR measurements of femoropopliteal artery size to angiographic visual estimation, duplex ultrasound, quantitative angiography, and intravascular ultrasound. The primary effectiveness and safety end point was comparison against core laboratory adjudicated intravascular ultrasound values and major adverse events, respectively. Additional preclinical studies were also performed in vitro and in vivo in swine to determine the accuracy of the LR guidewire system. No intra- or postprocedure device-related adverse events occurred. A balloon or stent was successfully delivered in 12 patients (50%) over the LR wire. Differences in repeatability between successive LR measurements was 2.5±0.40% (R2=0.96) with no significant bias. Differences in measurements of LR to other modalities were 0.5±1.7%, 5.0±1.8%, -1.5±2.0%, and 6.8±3.4% for intravascular ultrasound core laboratory, quantitative angiography, angiographic, and duplex ultrasound, respectively. CONCLUSIONS This study demonstrates that through a physics-based principle, LR provides a real-time, safe, reproducible, and accurate vessel size of the femoropopliteal artery during intervention and can additionally serve as a conduit for therapy delivery over its wire-based platform.
Collapse
Affiliation(s)
- Pradeep K Nair
- From the Cardiovascular Institute of the South, Houma, LA (P.K.N.); Cardiovascular Associates of East Texas, Tyler (J.G.C.); Heart Center of Indiana, Indianapolis (B.B.); Brigham and Women's Hospital, Harvard Medical School, Boston, MA (D.L.B.); 3DT Holdings, LLC, San Diego, CA (Z.C.B.); and North Carolina Heart and Vascular Research Center, Raleigh (G.A.).
| | - Jeffrey G Carr
- From the Cardiovascular Institute of the South, Houma, LA (P.K.N.); Cardiovascular Associates of East Texas, Tyler (J.G.C.); Heart Center of Indiana, Indianapolis (B.B.); Brigham and Women's Hospital, Harvard Medical School, Boston, MA (D.L.B.); 3DT Holdings, LLC, San Diego, CA (Z.C.B.); and North Carolina Heart and Vascular Research Center, Raleigh (G.A.)
| | - Brian Bigelow
- From the Cardiovascular Institute of the South, Houma, LA (P.K.N.); Cardiovascular Associates of East Texas, Tyler (J.G.C.); Heart Center of Indiana, Indianapolis (B.B.); Brigham and Women's Hospital, Harvard Medical School, Boston, MA (D.L.B.); 3DT Holdings, LLC, San Diego, CA (Z.C.B.); and North Carolina Heart and Vascular Research Center, Raleigh (G.A.)
| | - Deepak L Bhatt
- From the Cardiovascular Institute of the South, Houma, LA (P.K.N.); Cardiovascular Associates of East Texas, Tyler (J.G.C.); Heart Center of Indiana, Indianapolis (B.B.); Brigham and Women's Hospital, Harvard Medical School, Boston, MA (D.L.B.); 3DT Holdings, LLC, San Diego, CA (Z.C.B.); and North Carolina Heart and Vascular Research Center, Raleigh (G.A.)
| | - Zachary C Berwick
- From the Cardiovascular Institute of the South, Houma, LA (P.K.N.); Cardiovascular Associates of East Texas, Tyler (J.G.C.); Heart Center of Indiana, Indianapolis (B.B.); Brigham and Women's Hospital, Harvard Medical School, Boston, MA (D.L.B.); 3DT Holdings, LLC, San Diego, CA (Z.C.B.); and North Carolina Heart and Vascular Research Center, Raleigh (G.A.)
| | - George Adams
- From the Cardiovascular Institute of the South, Houma, LA (P.K.N.); Cardiovascular Associates of East Texas, Tyler (J.G.C.); Heart Center of Indiana, Indianapolis (B.B.); Brigham and Women's Hospital, Harvard Medical School, Boston, MA (D.L.B.); 3DT Holdings, LLC, San Diego, CA (Z.C.B.); and North Carolina Heart and Vascular Research Center, Raleigh (G.A.)
| |
Collapse
|
7
|
Assessment of the Vessel Lumen Diameter and Degree of Stenosis in the Superficial Femoral Artery before Intervention: Comparison of Different Algorithms. J Vasc Interv Radiol 2009; 20:192-202. [DOI: 10.1016/j.jvir.2008.10.010] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/09/2008] [Revised: 10/07/2008] [Accepted: 10/13/2008] [Indexed: 11/19/2022] Open
|
8
|
Tatò F, Hoffmann U, Weber C, Reiser M, Rieger J. Comparison of angiography, duplex sonography and intravascular ultrasound for the graduation of femoropopliteal stenoses before and after balloon angioplasty. ULTRASOUND IN MEDICINE & BIOLOGY 2006; 32:1837-43. [PMID: 17169696 DOI: 10.1016/j.ultrasmedbio.2006.06.015] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/26/2006] [Revised: 06/05/2006] [Accepted: 06/15/2006] [Indexed: 05/13/2023]
Abstract
The graduation of femoropopliteal stenoses by either digital subtraction angiography (DSA) or duplex sonography remains challenging, particularly after percutaneous transluminal angioplasty (PTA). More accurate assessment of stenosis might be achieved with intravascular ultrasound (IVUS). We investigated the relationship between DSA, IVUS and duplex before and after 32 femoropopliteal PTAs. Over the whole range of stenoses, peak systolic velocity (PSV) and peak velocity ratio (PVR) correlated better with DSA-stenosis (R(2) = .72 and 0.74, respectively, p < 0.01) than with IVUS-stenosis (R(2) = 0.58 and 0.50, p < 0.01). Within the subgroup of preinterventional (51 to 99%) stenoses, PVR was significantly correlated only with DSA-stenosis (R(2) = 0.60, p < 0.01). Severe dissection after PTA was associated with a disproportionate rise in PSV and large discrepancies between IVUS and DSA. Unexpectedly, our data show that intrastenotic flow acceleration assessed by duplex sonography correlates better with DSA- than with IVUS-stenosis. The concordance between duplex sonography, DSA and IVUS was particularly weak in postinterventional measurements, casting some doubt on the reliability of these methods for the assessment of residual stenosis after femoropopliteal PTA.
Collapse
Affiliation(s)
- Federico Tatò
- Division of Vascular Medicine of the Medical Policlinic, Ludwig-Maximilians University of Munich, Munich, Germany.
| | | | | | | | | |
Collapse
|
9
|
Abstract
This article reviews the fundamental techniques to quantify the physiological severity of (coronary) stenoses. Although a wide survey of different techniques and applications is provided, the focus of this review is on: 1) the assessment of the immediate effect of the stenoses on blood flow (i.e., the hemodynamic severity), and not on the assessment of the pathology of the vessel itself; 2) the flow reserve methods to defining the physiological severity of stenoses; and 3) the determination of blood flow and tissue perfusion by X-ray angiography (a short survey of other imaging modalities is provided as well). Although the practical implementation of the techniques is illustrated by applying them to coronary stenoses, most of the issues involved are of interest in other application areas (using other imaging modalities) as well. This review consists of four parts. The first part deals with the definition of stenoses severity; the second part with tracer kinetic theory necessary to determine flows by imaging; the third part focusses on (cardiac) imaging modalities, with an emphasis on X-ray angiography; and the last part illustrates the practical implementation of the techniques in cardiology.
Collapse
Affiliation(s)
- M Schrijver
- Chair of Signals and Systems, Faculty of Electrical Engineering, University of Twente, Enschede, The Netherlands.
| |
Collapse
|
10
|
Giudice R, Scoccianti M. Simple technique to decrease total clamping time during combined iliac and femoral endovascular procedures. J Endovasc Ther 2003; 10:126-9. [PMID: 12751943 DOI: 10.1177/152660280301000124] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
PURPOSE To describe an alternative method of gaining vascular access while preserving blood flow to the profunda femoral artery during combined iliac and superficial femoral artery (SFA) recanalization. TECHNIQUE A sheath is introduced through the occluded SFA to reduce the total ischemic time when both the external iliac artery and SFA are obstructed. After iliac stenting and remote endarterectomy of the SFA with stent-graft deployment, blood flow to the profunda is interrupted only briefly when the proximal anastomosis of the femoral endobypass is completed. CONCLUSIONS Sheath insertion into the proximal portion of an occluded SFA can be an effective option in reducing ischemic time when dealing with combined iliac and femoral endovascular procedures.
Collapse
Affiliation(s)
- Rocco Giudice
- Division of Vascular Surgery, Endovascular Surgery Unit, S. Giovanni-Addolorata Hospital Complex, Rome, Italy
| | | |
Collapse
|
11
|
Giudice R, Scoccianti M. Simple Technique to Decrease Total Clamping Time During Combined Iliac and Femoral Endovascular Procedures. J Endovasc Ther 2003. [DOI: 10.1583/1545-1550(2003)010<0126:sttdtc>2.0.co;2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
|
12
|
Sehgal V, Li Z, Palta JR, Smith KM, Bolch WE. Application of imaging-derived parameters to dosimetry of intravascular brachytherapy sources: perturbation effects of residual plaque burden. Med Phys 2002; 29:1580-9. [PMID: 12148741 DOI: 10.1118/1.1485053] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022] Open
Abstract
The dosimetric effect of geometric and material heterogeneities on intravascular brachytherapy dose delivery has been studied recently. Residual plaque within the coronary vessel appears to have an impact on the uniform delivery of radiation dose to the arterial tissue. In this study, we have examined the effect of residual plaque burden and post-PCI (percutaneous coronary intervention) plaque configuration on the dose to the arterial wall from clinical intravascular brachytherapy beta-emitting sources containing 32P and 90Sr/90Y. Monte Carlo simulations using the MCNP4B code were performed for these catheter-based sources with residual plaque burden ranging between 25% and 50%. The residual plaque burden values were derived from post-PCI data provided in several recent clinical studies. Dose calculations were performed for three different values of plaque density (1.45 g cm(-3), 2.20 g cm(-3), and 3.1 g cm(-3)) and three different plaque morphologies for the same residual plaque burden. The dose perturbation factor (DPF), defined as the ratio of dose at 2 mm radial distance for a given case to the dose at the same radial distance in homogeneous water medium, was determined for each of the three different plaque densities. The range of DPF values was 0.81-1.01, 0.62-0.99, and 0.41-0.97 for different plaque densities for the 32P source. Corresponding DPF values for the 90Sr/90Y source were 0.90-1.01, 0.84-1.01, and 0.62-1.01. The results indicate the need for accurate assessment of post-PCI clinical measurements such as minimal lumen diameter and residual plaque burden and incorporation of these values into dose calculations.
Collapse
Affiliation(s)
- Varun Sehgal
- Department of Radiation Oncology, University of Florida, Gainesville 32610-0385, USA
| | | | | | | | | |
Collapse
|
13
|
Cooper BZ, Kirwin JD, Panetta TF, Weinreb FM, Ramirez JA, Najjar JG, Blattman SB, Rodino W, Song M. Accuracy of intravascular ultrasound for diameter measurement of phantom arteries. J Surg Res 2001; 100:99-105. [PMID: 11516211 DOI: 10.1006/jsre.2001.6214] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
BACKGROUND Uniplanar quantitative angiography (QA) is the standard method for measuring vessel diameter during surgical and endovascular procedures. Intravascular ultrasound (IVUS), a relatively new technology, is another means of obtaining this measurement. This study was designed to validate the accuracy of these two modalities by comparing each to direct caliper measurement, the gold standard, using phantom femoral artery segments (PAS). MATERIALS AND METHODS PAS diameter was measured with a 12.5-MHz mechanically rotating IVUS catheter (Boston Scientific Corp.) and QA (OEC Corp.) was compared to the direct caliper measurement (Mitutoyo Corp.) at 60 different locations within PAS. At each location minimal lumen diameter and perpendicular lumen diameter were measured and their mean was calculated. The intraclass correlation coefficients (ICCC) between direct caliper measurement and IVUS and uniplanar and biplanar angiography were calculated. Fisher's Z transformation was used to compare the correlation coefficients. RESULTS The ICCC for IVUS was 0.89. The ICCCs for uniplanar and biplanar angiography were 0.73 and 0.82, respectively. IVUS correlated more closely with direct caliper measurement than uniplanar and biplanar angiography (P = 0.00008, 0.02) Biplanar angiography correlated more closely with direct caliper measurement than uniplanar angiography (P = 0.04). CONCLUSIONS IVUS more accurately measures lumen diameter than uniplanar or biplanar angiography. Diameter measurement with biplanar angiography is more accurate than uniplanar angiography.
Collapse
Affiliation(s)
- B Z Cooper
- Department of Surgery, SUNY-Downstate Medical Center, Brooklyn, New York 11203, USA
| | | | | | | | | | | | | | | | | |
Collapse
|
14
|
Hagenaars T, Gussenhoven EJ, van der Linden E, Bom N. Reproducibility of calcified lesion quantification: a longitudinal intravascular ultrasound study. ULTRASOUND IN MEDICINE & BIOLOGY 2000; 26:1075-1079. [PMID: 11053741 DOI: 10.1016/s0301-5629(00)00246-5] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
Abstract
In view of a prospective intravascular ultrasound (IVUS) study, the reproducibility of the extent of the calcified lesion in IVUS images derived from separate pull-back maneuvers was assessed. Patients (n = 34) were imaged with IVUS before and after percutaneous transluminal angioplasty (PTA) and at 1-y follow-up. In the presence of a calcified lesion, the largest arc and the length of the matched calcified lesions was assessed. Interobserver differences in arc measurements were low (< or = 0.7%), with low coefficients of variation (< or = 5.8%). Similarly, interexamination differences in arc and length measurements were small (< or = 1.1%), with low coefficients of variation (< or = 3.2%). At follow-up, a nonsignificant increase in both the arc (1.9%) and length (1.7%) of the calcified lesion was observed. This study showed that measurements of the calcified lesion are highly reproducible; changes seen at 1-y follow-up were not significant. We conclude that IVUS may be used to monitor the effect of medical intervention on the extent of the calcified lesion in a longitudinal study.
Collapse
Affiliation(s)
- T Hagenaars
- Department of Cardiology, Erasmus Medical Center Rotterdam, Rotterdam, The Netherlands
| | | | | | | |
Collapse
|
15
|
Cothren RM, Shekhar R, Tuzcu EM, Nissen SE, Cornhill JF, Vince DG. Three-dimensional reconstruction of the coronary artery wall by image fusion of intravascular ultrasound and bi-plane angiography. INTERNATIONAL JOURNAL OF CARDIAC IMAGING 2000; 16:69-85. [PMID: 10928342 DOI: 10.1023/a:1006304419505] [Citation(s) in RCA: 33] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Abstract
BACKGROUND Intravascular ultrasound (IVUS) is becoming increasingly accepted for assessing coronary anatomy. However, its utility in visualizing and quantifying coronary morphology has been limited by its 2D tomographic nature. This study presents a 3D reconstruction technique that accurately preserves 3D geometric information. METHODS AND RESULTS Images obtained from manual IVUS pullbacks and continuous bi-plane angiography were fused, using angiography to reconstruct the transducer trajectory and aid in solving for the correct rotational orientation. A novel 3D active surface method automatically identified the luminal and medial-adventitial borders which, when superimposed on the transducer trajectory, could be surface-rendered for visualization and morphometry. Segmentation agreed well with manual assessment, and 3D luminal shape matched that of angiography when projected to 2D. CONCLUSIONS We conclude that this method provides an accurate reconstruction of the vessel's anatomy, which accounts for the true curvature of the vessel.
Collapse
Affiliation(s)
- R M Cothren
- Department of Biomedical Engineering, The Cleveland Clinic Foundation, Ohio 44195, USA
| | | | | | | | | | | |
Collapse
|
16
|
van Sambeek MR, Gussenhoven EJ. Practical application of intravascular ultrasound in endovascular interventions. Eur J Vasc Endovasc Surg 1999; 18:463-5. [PMID: 10637139 DOI: 10.1053/ejvs.1999.0910] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
|