History and Science of CO 2 Digital Subtraction Angiography
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1 History and Science of CO 2 Digital Subtraction Angiography Kyung Cho, M.D. University of Michigan
2 The First Use of CO 2 as a Nonvascular Contrast Agent 1920s Carelli and Sordelli of Buenos Aires performed retroperitoneal pneumography with CO 2 for visualization of the kidneys and adrenal masses Presacral insufflation with CO 2 has replaced air or oxygen insufflation, thus eliminating the hazard of air emboli Carelli HH and Sordelli E. Un Nuevo procedimento para explorar el ninon Rev Assoc Med Argent 34: , 1921
3 CO 2 Angiocardiogram 1950s to 1970s Antecubital vein injection of 100 cc of CO 2 with pt in LLD CO 2 Radiolucent gas trapped in right atrium Opaque band above gas represents pericardial space Normal band thickness is 3 mm
4 CO 2 Capnocavography CO 2 inferior venacavography with the intravenous injection of 80 cc of CO 2 CO 2 Radiology 92:606,1969
5 Pioneer of CO 2 Angiography Dick Hawkins, M.D CO 2 Aortogram
6 Celiac Arteriogram with Air Inadvertent room air injection (70 cc) in celiac artery with good visualization of major arteries AJR 139:19,1982
7 Renal CO 2 Arteriogram AJR139:19,1982 CO 2 arteriogram obtained in 1971 with 20 cc of CO 2.
8 Renal CO 2 DSA CO 2 aortogram in severely hypertensive man. Aortic injection of 35 cc/sec for a total of 75 cc. Digital subtraction imaging AJR 139:19, 1982
9 The Evolution of CO 2 Delivery Techniques Hand held Syringe Standard Angio Injector CO 2 Cylinder (animals only) different dedicated models
10 A B (A) Early model hand-held CO 2 injector. (B) Angiojet computerized CO 2 injector (Angiodynamics)
11 The plastic bag CO 2 delivery system AJR 176:229, 2001
12 AngioFlush Bag System AngioDynamics (discontinued)
13 MERITMEDICAL Custom Waste Bag and Contrast Delivery Set
14 CO 2 mmander and AngiAssist Delivery system
15 Science of CO 2 Angiography
16 Unique CO 2 Properties Negative contrast High solubility Low viscosity Buoyancy Compressibility
17 Properties of CO 2, O 2, N 2, Iodine and Gd CO2 O2 N2 Molecular wt solubility Atomic Number CO 2 C = 6, O =8 Iodine 53 Gd 64
18 Comparative Radiopacity of Saline, Iodine, Gd and CO 2 Saline Omnipaque 240 Gd CO 2 in arm vein
19 CO 2 Angioscopy CO 2 angioscopy shows origin of right renal artery Total displacement of blood without arterial flow from branches
20 CO 2 Cholangiogram CO 2 injection in bile duct fills intra-and extrahepatic ducts Peripheral displacement of contrast medium
21 CVIR;29:637,2006 Air Volume Percent Changes over Time in 20 cc CO 2 -filled Syringes Air Volume Percent of Syringe cc Upright 20 cc Inverted 20 cc Horizontal Time (min.)
22 The Solubility of CO 2 5 cc of CO 2 injected into IVC in L lateral decubitus Cross-table lateral DSA of CO 2 trapped in right atrium CO 2 Complete gas absorption in 45 sec
23 Aortoiliac Occlusive Disease: CO 2 DSA 3F dilator inserted into L external iliac artery (arrow) Injection of 30 cc of CO 2 in L external iliac artery CO 2 filling iliac, collaterals, inflow and outflow vessels
24 Celiac Stenosis: Median Arcuate Ligament Compression A B (A) Celiac DSA with contrast medium showing flow defect at origin of GDA. (B) CO 2 injection fills both celiac and SMA branches
25 CT with intra-aortic injection of CO 2 and contrast medium: CO 2 displaces blood whereas contrast is mixed with blood CO 2 Contrast
26 Buoyant CO 2 is trapped in AAA CO 2 A CO 2 aortogram X-table Lat
27 Lateral CO 2 Aortogram:Median Arcuate Ligament Compression EX INS X-table lateral
28 CO 2 Bubble Flow in a 9.5 mm Tube of a Pulsatile Flow Model 30 0 inclination CO2 Blood
29 CO 2 Dispersal from Different Catheter Design Endhole Halo Pigtail
30 CO 2 Filling of 15.9 mm Tube in a Pulsatile Flow Model: Supine vs elevation 65% CO 2 CO 2 84 %
31 Superior venacavogram with intravenous CO 2 injection Supine LLD: X-table Lat CO 2 in PA CO 2 in RA
32 Buoyant CO 2 injected into right hepatic vein filling anterior, middle and left hepatic veins
33 Buoyant, less viscous CO 2 injected into wedged right hepatic vein fills the portal, right, middle and left hepatic veins
34 Diagram of the hepatic microcirculation
35 CO2 compression during Wedged Hepatic Venogram
36 Buoyant, compressible CO 2 injected into celiac artery flows backwards, filling the aorta, superior mesenteric and renal arteries
37 CO 2 Renal DSA CO 2 Renal DSA Renal artery aneurysm CO 2 injection via microcatheter
38 Safety and Tolerance Study of CO 2 as a Venous Contrast Agent in Swine The hemodynamic and ventilatory responses to intracaval injections of ascending doses of CO 2
39 Polygraph tracing of blood pressure, pulmonary artery pressure and CVP following intracaval injection of CO 2 at 3.2 cc/kg in swine
40 Average percent changes in systemic blood pressure following intracaval injections of ascending doses of CO 2 in swine Supine 80 BP % Change in SBP CO 2 ( cc/kg) Time (min.)
41 Average percent changes of ETCO 2 following intracaval injections of ascending doses of CO 2 in swine Supine ET CO 2 CO2 (cc/kg) 0.0 % change in ET CO Time (min.)
42 Continuous Monitoring during CO 2 Angiography Pulse oximetry (oxygenation) ECG/HR (Circulation) BP (Circulation) Respirations (oxygenation) Capnography (Ventilation & Perfusion)
43 End-tidal CO 2 monitoring: Increasing Patient Safety during Procedural Sedation and CO 2 angiography EtCO 2 Detect early signs of hypoventilation Information on RR, depth, & apnea Desaturation (SpO 2 )-a late sign of respiratory compromise in hypoventilation.
44 Conclusions CO 2 has been used as a contrast agent in the nonvascular system since 1920s, in the venous system since 1950s and in the arterial system since 1970s. Intravenous CO 2 in doses of cc/kg caused no cardiopulmonary effects in swine. CO 2 is the only safe, proven contrast agent in patients with contrast allergy and renal failure.
45 A thorough knowledge of CO 2 properties, and facile catheterization and imaging techniques are essential in obtaining a successful CO 2 angiogram for the vascular diagnosis and intervention. Blood pressure monitoring and capnography provide the earliest sign of vapor lock in the pulmonary artery from the inadvertent injection of large volume of CO 2 or air.
46 CO 2 is useful as a contrast agent in various vascular diagnosis and interventions, including angioplasty, stenting, thrombolysis, embolization, filter placement, TIPS, and EVAR. Both the plastic bag system and CO 2 mmander with AngiAssist allow for a safe, simple CO 2 delivery for CO 2 angiography.
47 CO 2 Angiography
48 University of Michigan
49 History and Science of CO 2 Digital Subtraction Angiography Kyung Cho, M.D. University of Michigan
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