3. Coronary artery
The coronary artery arises just
superior to the aortic valve and
supply the heart
The aortic valve has three cusps –
left coronary (LC),
right coronary (RC)
posterior non-coronary (NC) cusps.
3
4. Right coronary artery
Originates from right
coronary sinus of Valsalva
Courses through the right
AV groove between the
right atrium and right
ventricle to the inferior part
of the septum
4
5. Branches of RCA
Conus artery
Sinu nodal artery
Right coronary artery
Conus branch
SINU NODAL BRANCH
5
AV NODAL ARTERY
6. Conus branch – 1st branch supplies the RVOT
Sinus node artery – 2nd branch - SA node.(in 40%
they originate from LCA)
Acute marginal arteries-Arise at acute angle and
runs along the margin of the right ventricle above
the diaphragm.
Branch to AV node
Posterior descending artery : Supply lower part of
the ventricular septum & adjacent ventricular walls.
Arises from RCA in 85% of case.
6
7. The right coronary artery. Course of
the right coronary artery (RCA)
on a series of axial images
acquired from top to bottom (A-
F). (A-C) The aorta gives rise to
the proximal segment (1), which
courses in an anterolateral
direction. (D) The middle
segment of the RCA takes a
nearly vertical downward
course (2). (E) The RCA then
turns to the left and continues to
the posterior aspect of the heart
(segment 3) along a nearly
horizontal course on the
diaphragmatic surface of the
heart. (F) At the crux of the
heart—the junction of the septa
and walls of the four heart
chambers—the RCA branches
into the posterior descending
artery and right posterolateral
branch (4). Ao, aorta; RV, right
ventricle; LV, left ventricle; LA,
left atrium.
8. Area of distribution
8
RT CORONARY ARTERY----
1)Right atrium
2)Ventricles
i) greater part of Rt. Ventricle
ii) a small part of the Lt ventricle
adjoining posterior IV groove.
3)Posterior part of the IV septum
4)Whole of the conducting system of the heart, except part
of the left br of AV bundle
9. Left coronary artery
Arises from left coronary
cusps
Travels between RVOT
anteriorly and left atrium
posteriorly.
Almost immediately
bifurcate into left anterior
descending and left
circumflex artery.
9
11. The left anterior descending coronary artery. Course of the left anterior descending
coronary artery (LAD) on a series of axial images acquired from top to bottom (A-
H). (A) The aorta gives rise to the left main coronary artery (5), which gives off the
proximal segment (6) of the LAD anteriorly. (B-C) Along its further course, the
artery divides into the middle LAD segment (7) and a diagonal branch (9). (D) In
most individuals, there is a second branching of the LAD. A second diagonal branch
(10) arises from the distal segment (8). (E-H) The distal parts of the LAD can be
followed as they course in the interventricular groove toward the apex. Note that
the diagonal branches may occasionally be larger than the main LAD. Ao, aorta; RV,
right ventricle; LV, left ventricle; LA, left atrium.
12. The left circumflex coronary artery. Course of the left circumflex coronary artery (LCX) on a series of
axial images acquired from top to bottom (A-H). (A) The aorta gives rise to the left main coronary
artery (5), which gives of the proximal segment (11) of the LCX posteriorly. (B-D) Along its further
course, the artery divides into the middle segment of the LCX (13) and a marginal branch (12). (E-
H) The middle segment (13) then gives off a second marginal branch (14). The circumflex branch
turns around the left border and continues on the diaphragmatic surface (distal segment, 15).
Ao, aorta; LA, left atrium; arrow, segment 12
14. Area of Distribution
14
1) Left atrium.
2) Ventricles
i) Greater part of the left ventricle, except the area
adjoining the posterior IV groove.
ii) A small part of the right ventricle adjoining the
anterior IV groove.
3) Anterior part of the IV septum.
4) A part of the left bundle branch of the AV
bundle.
15. DOMINANCE
15
Dominance is described by which coronary
artery branch gives off the posterior
descending artery and supplies the inferior
wall, and is characterized as left, right, or
codominant
18. CT CORONARY ANGIOGRAPHY
18
Coronary computed tomography angiography
(CCTA) is an effective noninvasive method to image
the coronary arteries
MDCT has multiple detector rows which are placed
opposite the x-ray tube which shortens the
examination time and improves the temporal
resolution
19. INDICATION
Screening high risk patients
Evaluation of chest pain with low or moderate
probablity of coronary artery disease
Non invasive evaluation of coronary artery
anamolies
Post CABG
Post stent
32
20. CONTRAINDICATIONS
Absolute contraindication :
1. Hypersensitivity to iodinated contrast agent
2. Pregnancy
Relative contraindication
Irregular rhythm
Renal insufficiency (sr. creatinine > 1.5 mg/ml)
Hyperthyroidism
Inability to hold breath for 10 sec
History of allergy to other medication
Metallic interference (e,g: pacemaker, defibrillator wires) 33
21. PATIENT PREPARATION
21
Avoid caffeine and smoking 12 hours prior to the
procedure to avoid cardiac stimulation.
B- blocker : Oral or I.V B-blocker is used in patient with
heart rate greater than 65 bpm
oral 50- 100 mg metaprolol administered 45 min to 1
hr before procedure.
or I.V Metaprolol 5 to 20 mg at the time of procedure
Sublingual Nitrates or Nitroglycerine: can be given
immediately before the procedure to dilated the
coronary arteries.
22. Volume and rate of contrast
administration
22
Using 64 detector MDCT technology:
80ml of contrast agent is injected at 6 ml/sec
f/b 40ml saline solution at 4ml/sec
.
23. After contrast administration, CT is obtained in
single breath-hold
Scan volume covers the entire heart from the
proximal ascending aorta (approximately 1–2 cm
below the carina) to the diaphragmatic surface of
the heart
23
25. CAD-RADS is the Coronary Artery Disease-Reporting and Data
System.
CAD-RADS is developed to standardize reporting of coronary
CTA, to improve communication and to guide therapy.
In 2022 CAD RADS was updated to version 2.0
26.
27. In CAD RADS 2.0 there are modifiers that can be added to
the Cad-Rads category:
N: indicates that a study is non-diagnostic
HRP: high-risk plaque (replaces V-vulnerable plaque)
I: ischemia
S: presence of stents
G: coronary artery bypass grafts
E: exceptions
28. Example of a non-diagnostic scan. Both the RCA and LCX are blurred due to
motion artifacts, resulting in CAD RADS N.
36. ⦿ Refers to cardiac muscle that is alive
• presence of cellular, metabolic, and microscopic contractile
function
⦿Two basic mechanisms of reversible ischemic
dysfunction
• myocardial stunning
• myocardial hibernation
37. ⦿Prolonged post-ischemic ventricular dysfunction that
occurs after brief episodes of non-lethal ischemia
⦿Transient LV dysfunction commonly observed following
an acute myocardial infarction treated with prompt
reperfusion.
38. ⦿Myocardium downregulates its contractile function in
the presence of sustained reduced blood flow.
⦿Cardiac myocytes are depleted of their contractile
material and filled with glycogen (PAS-positive
staining)
39. IMAGING VIABLE MYOCARDIUM
o Dobutamine stress echocardiography
o SPECT(Thallium/ technetium)
o 18 FDG PET
o CMR
40. Echocardiography
To asess Resting LV size and function
⦿LV wall thinning is a marker for scarring
⦿LV end-diastolic wall thickness (EDWT) of <6 mm
indicates non viable myocardium
41. Dobutamine stress Echocardiography
o To assess Contractile Reserve
o dobutamine infusion started at 2.5
μg/kg/min, with gradual increase to 5, 7.5, 10
μg/kg/min.
42.
43. NUCLEAR TECHNIQUES
X It utilizes radionuclide-labeled tracers to assess
myocyte integrity and function by measuring regional
tracer concentration in the myocardium.
o Thallium Membrane function
o Tc-99 membrane & mitochondia function
o FDG Glucose Metabolism
o Fatty acid Fatty acid Metabolism
44. Tc 99
Tc 99 labeled radiotracers are taken up by myocytes
across mitochondrial membranes.
The initial uptake and retention of these tracers reflect
cell membrane integrity and mitochondrial function
and thus indicate viability.
46. 18 FDG PET
PET Imaging for viability involves a combination of
Myocardial Perfusion + Metabolic Imaging
N13 Ammonia 18 F-FDG
• Uptake indicates presence Uptake indicates
of blood supply Metabollicaly active cell
49. CARDIAC MRI
Gadolinium based contrast agents are administered at
0.1mmol/kg patient weight and images are taken 10
mins after the injection to demonstrate LATE
GADOLINIUM ENHANCEMENT(LGE).
50. RAPID WASHOUT
NO LATE ENHANCEMENT Retention of Gadolinium in Extra
cellular space causing
LATE GADOLINIUM ENHANCEMENT
51.
52. o LGE =100 % of Ventricle wall thickness s/o Transmural infarct
o LGE > 50% of Ventricle wall thickness s/o Non viable
myocardium
o LGE <50% of Ventricle wall thickness suggests viability
