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Coronary Angiography


General Principles

Historical Perspective
Appropriate Use Criteria for Revascularization
Film Quality

Anatomy & Projection Angles

Normal Anatomy

Coronary arteries
Right System
Left System
Left Main
Left Anterior Descending
Median Ramus

Anatomic Variants

Separate Ostia
Anomalous Origins

Projection Angles

Standard Views
Left Coronary Artery
Right Coronary Artery

Epicardial Flow & Myocardial Perfusion

Epicardial Flow

TIMI Frame Count
TIMI Flow Grade
TIMI Grade 0 Flow
TIMI Grade 1 Flow
TIMI Grade 2 Flow
TIMI Grade 3 Flow
TIMI Grade 4 Flow
Pulsatile Flow

Myocardial Perfusion

TIMI Myocardial Perfusion Grade
TMP Grade 0
TMP Grade 0.5
TMP Grade 1
TMP Grade 2
TMP Grade 3

Lesion Complexity

ACC/AHA Lesion-Specific Classification of the Primary Target Stenosis

Preprocedural Lesion Morphology

Intimal Flap
Sawtooth Pattern
Ostial location
Proximal tortuosity
Degenerated SVG
Total occlusion
Coronary Artery Thrombus
TIMI Thrombus Grade
TIMI Thrombus Grade 0
TIMI Thrombus Grade 1
TIMI Thrombus Grade 2
TIMI Thrombus Grade 3
TIMI Thrombus Grade 4
TIMI Thrombus Grade 5
TIMI Thrombus Grade 6

Lesion Morphology

Quantitative Coronary Angiography
Definitions of Preprocedural Lesion Morphology
Irregular Lesion
Disease Extent
Arterial Foreshortening
Infarct Related Artery
Degenerated SVG

Left ventriculography

Quantification of LV Function
Quantification of Mitral Regurgitation

Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1]; Associate Editor(s)-in-Chief: ; Vanessa Cherniauskas, M.D. [2]

Synonyms and Keywords: deceleration of diastolic flow; deceleration time of diastolic flow velocity (DDT)


The deceleration time of diastolic flow may be a parameter to evaluate the degree of microvasculature damage that might predict the residual myocardial viability assessed by angiography.


  • Deceleration is defined as when dye flow down in the artery is slowed at any point during the course of flow.
  • The diastolic deceleration rate (m/s2) refers to the calculation of the rate of decline in flow velocity in diastole.[1]


Microvascular ischemic damage after epicardial coronary artery occlusion affects coronary vascular resistance and may result in perivascular edema in which the generation of capillary leukocyte plugging contributes to prevention of full restoration of myocardial perfusion.[2][3][4] Thus, the deceleration time of diastolic flow velocity may be explained as an increase in coronary vascular resistance caused by such ischemic microvascular impedance which significantly affects total coronary resistance in patients without severe coronary stenosis.[2][3][4][5][6] Hence, this fact explains the reduction in postprocedural coronary systolic flow velocity in patients with no-reflow and is also the reason for a significantly increase in total coronary resistance in patients without severe coronary stenosis.[1][7]

The deceleration time of diastolic flow velocity might reflect the coronary blood flow and is represented by a high ratio of perfused myocardium per functioning coronary microvasculature. So, the degree of reduced systolic antegrade flow or the deceleration time of diastolic flow evidence the level of microvasculature damage and be predictive of residual myocardial viability. Thus, the coronary blood flow velocity pattern seems almost normal in viable myocardium but is reduced in nonviable myocardium due to a systolic retrograde flow and a rapid deceleration of diastolic flow velocity.[5]

Clinical Significance

The coronary blood flow velocity pattern of no-reflow in patients with reperfused AMI is characterized by the occurrence of:

  • Systolic retrograde flow.[1]
  • Diminished systolic antegrade flow.[1]
  • Rapid deceleration of diastolic flow.[1]
  • May occur immediately after reperfusion or shortly thereafter.[8]

Disturbances are present during the deceleration phase of systole related to mild to moderate stenosis.[9]


Deceleration (Left Anterior Descending Artery)
Deceleration (Left Anterior Descending Artery)


  1. 1.0 1.1 1.2 1.3 1.4 Iwakura, K.; Ito, H.; Takiuchi, S.; Taniyama, Y.; Nakatsuchi, Y.; Negoro, S.; Higashino, Y.; Okamura, A.; Masuyama, T. (1996). "Alternation in the coronary blood flow velocity pattern in patients with no reflow and reperfused acute myocardial infarction.". Circulation. 94 (6): 1269–75. PMID 8822979. 
  2. 2.0 2.1 Frame, LH.; Powell, WJ. (1976). "Progressive perfusion impairment during prolonged low flow myocardial ischemia in dogs.". Circ Res. 39 (2): 269–76. PMID 939013. 
  3. 3.0 3.1 Gorman, MW.; Sparks, HV. (1982). "Progressive coronary vasoconstriction during relative ischemia in canine myocardium.". Circ Res. 51 (4): 411–20. PMID 7127678. 
  4. 4.0 4.1 Engler, RL.; Schmid-Schönbein, GW.; Pavelec, RS. (1983). "Leukocyte capillary plugging in myocardial ischemia and reperfusion in the dog.". Am J Pathol. 111 (1): 98–111. PMID 6837725. 
  5. 5.0 5.1 Kawamoto, T.; Yoshida, K.; Akasaka, T.; Hozumi, T.; Takagi, T.; Kaji, S.; Ueda, Y. (1999). "Can coronary blood flow velocity pattern after primary percutaneous transluminal coronary angioplasty [correction of angiography] predict recovery of regional left ventricular function in patients with acute myocardial infarction?". Circulation. 100 (4): 339–45. PMID 10421592. 
  6. Stone, GW.; Grines, CL.; Rothbaum, D.; Browne, KF.; O'Keefe, J.; Overlie, PA.; Donohue, BC.; Chelliah, N.; Vlietstra, R. (1997). "Analysis of the relative costs and effectiveness of primary angioplasty versus tissue-type plasminogen activator: the Primary Angioplasty in Myocardial Infarction (PAMI) trial. The PAMI Trial Investigators.". J Am Coll Cardiol. 29 (5): 901–7. PMID 9120173. 
  7. Nicklas, JM.; Diltz, EA.; O'Neill, WW.; Bourdillon, PD.; Walton, JA.; Pitt, B. (1987). "Quantitative measurement of coronary flow during medical revascularization (thrombolysis or angioplasty) in patients with acute infarction.". J Am Coll Cardiol. 10 (2): 284–9. PMID 2955024. 
  8. Iwakura, K.; Ito, H.; Nishikawa, N.; Hiraoka, K.; Sugimoto, K.; Higashino, Y.; Masuyama, T.; Hori, M.; Fujii, K. (1999). "Early temporal changes in coronary flow velocity patterns in patients with acute myocardial infarction demonstrating the no-reflow phenomenon.". Am J Cardiol. 84 (4): 415–9. PMID 10468079. 
  9. "". Retrieved 13 November 2013.