Imaging Strategies for Endovascular Cardiovascular Procedures and Percutaneous Aortic Valves. Roy K Greenberg, MD
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1 Imaging Strategies for Endovascular Cardiovascular Procedures and Percutaneous Aortic Valves Roy K Greenberg, MD
2 Disclosure Research support Cook Inc, Boston Scientific, W.L.Gore, Cordis, Vascutek, Terarecon Consulting, Intellectual Property, Travel Expenses Cook Inc
3 Patient Presentation 83 female Severe aortic stenosis and coronary artery disease PCI of circumflex, and aortic valvuloplasty (2006 ) Complaining of: SOB with minimal exertion, PND, on home oxygen Denies angina and syncope Case 9
4 Echocardiogram Aortic valve Severe calcific AS AVA 0.7 cm 2 by continuity equation Peak gradient 95 mm Hg Mean gradient 59 mm Hg Severe calcification of the aortic cusps Mitral valve Anterior and posterior annular calcification MR 1-2+ Tricuspid valve TR 1+ RVSP 41 mm Hg LVEF 55% with moderate LVH, normal size and function Case 8
5 Root Measurements LVOT CT Measurements Geometry 20 mm (min) Circular 20 mm (max) Echo 18 mm Annulus 23 mm (min) 23 mm (max) Circular 31 mm AVA 0.5 cm cm 2
6 PVT Implantation
7 Transition to Bypass
8 Coronary Artery Wire Access
9 Salvage With Coronary Stents
10 Post Procedure Imaging
11 Purpose of Imaging Avoiding Complications Patient selection Access vessels Femoral, external iliac, common iliac, aorta Valve access Valve sizing Valve characteristics Optimizing technique Predicting complications Preop Echo CT Scanning Intraop Echo Intraop Angiography
12 CT Root Measurements Tops et al. Noninvasive Evaluation of the Aortic Root with Multislice Computed Tomography. JACC Imaging 2008;1:
13 Objective for Valve Analysis ECHO Degree of stenosis B-plane Continuity equation Functional analysis of the heart LV function RV function All valves CT Degree of stenosis Characteristics of the valve, root and annulus Diameter or area measurements Annulus STJ LVOT
14 Interrogating Valve Patients CT Mode = spiral, gated Minimal slice thickness = 0.75 mm Temporal Resolution: Dual Scanner 83msec 64 Row Scanner 165 msec Mode = spiral, non-gated Slice thickness = 3 mm
15 Access Vessels Concerns: Diameter Tortuosity Calcification Imaging Modality CT
16 Ilio-femoral Access Questions Where to make an incision Femoral or distal external iliac Potential need for conduit Predilation, hydrophyllic dialators Conduit construct End-to-end, end-to-side, aortic versus iliac Clamp location Understand anatomy Bailout procedures may be necessary
17 Valve Characteristics Stenosis Mechanism
18 Valve Analysis Tissue Characterization
19 Geometry The Root, Valve, and Ascending Aorta STJ annulus STJ annulus Tubular aorta Aortic Root LV outflow
20 Longitudinal Root Remodeling Control AS 1 = AN to STJ 2 = AN to COR 3 = AN to CUSP Akhtar et al. Submitted JTCVS 2008
21 Valve Area and Volume Systolic Measurement
22 Transfemoral C-arm Orientation RAO 20, caudal 57 LAO 34, cranial 21
23 Trans-apical Orientation
24 Post-procedure Analysis
25 Dimensions: LVOT LVOT Measurements (CT versus Echo) p value <0.05 LVOT (mm) CT Echo Patient
26 Dimensions: Annulus Annulus Measurements (CT versus Echo) p value <0.05 Annulus (mm) CT Echo Patient
27 Dimensions: Sino-tubular Junction Sino-tubular Junction Measurements (CT versus Echo) p value >0.05 NS STJ (mm) CT Echo Patient
28 Aortic Valve Area ECHO versus CT planimetry AVA: Continuity Equation versus CT planimetry p value >0.05 NS AVA (cm^2) Patient ECHO CT
29 Radiation Exposure Scan 4D with narrow z-coverage Additional entire aorta Standard invasive coronary angiography Standard coronary acquisition Standard thoracic aorta Standard thoracoabdominal aorta Exposure 10 msv 14 msv 2-3 msv 11 msv 10 msv 21 msv
30 Intraoperative Imaging What Procedures Will Be Performed In The Operating Room? Open operations Percutaneous procedures Hybrid procedures
31
32 Fundamental Considerations Available space Available budget Services Surgical Interventional Anesthesia Nursing Image quality Endovascular equipment Surgical instruments Anesthetic equipment Other Cardiopulmonary bypass TEE IVUS
33 Imaging Equipment Portable Units Flexibility Image Quality Procedural Duration Integration
34 Imaging Equipment Fixed Systems Floor Mounted Footprint Floor versus ceiling Weight restrictions Competition with other equipment OR lights Anesthesia Cardiopulmonary bypass Sterility Radiation exposure Ceiling Mounted
35 Imaging Equipment Advances Flat Panel Detectors Cine/Digital Subtration Variable Field of View Fusion Imaging OR Floating Point Tables
36 Disposable Materials and Storage Procedural Variety Vascular intervention Coronary intervention Hybrid procedures -Endografts, Valves Regional Storage Restricted Access Surgical Instruments
37 OR Layout Injector Lights Shields Imaging Equipment Monitor Bank A OR Bed Supplies Monitor Bank Supplies Surgeons
38 OR Layout Imaging Equipment Cardiopulmonary Bypass Monitor Bank TEE OR Bed Supplies A Gas Supplies Monitor Bank
39 Safety
40 Equipment Boom
41 Control Room Visibility Communication Storage Record Keeping Training Education
42 OR Data visualization
43 OR Data visualization
44 Updating OR Data Acquisition
45 Imaging Advances Updating OR Data visualization
46 Fusion Imaging
47 3D Data Exportation To Surgical Imaging Courtesy Dr. Indibir Gill
48 Using 3D Datasets to Assist with 2D Imaging
49 CTA Guided Angio Interventions Rotational angio used to acquire 3D vascular imaging data Remote CTA Rotational Angio CT Reference 3D dataset to 2D landmarks Calcium Spine Manually Link 3D dataset to C-arm rotation Appropriate project overlay on 2D image
50 Fusing Datasets
51 Merging 3D Projection To 2D Image
52 Four Dimensional Fusion
53 Fusion With Mathematical Modelling
54 Data Processing 3D Dataset Assume 600 images Segmentation/selection Exportation 2D dataset bit depth 1024x1024 C-arm position Patient position ECG Respiration
55 Everything is a Process.
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