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{| class="wikitable" border="1"
==Table 2==
{| class="wikitable" style="font-size:90%; border:1px solid darkgray;"  cellspacing="0"  


|+'''Characteristics of Type A, B, and C Lesions'''


|-
! style="width:300px; border-bottom:1px solid darkgray; background-color:#f2f2f2" | Lesion-Specific Characteristics


|-
| style="border-bottom:1px solid darkgray" | '''Type A lesions (minimally complex)'''
|-
| style="border-bottom:1px solid darkgray; padding-left:12px" | Discrete (length <10 mm)
|-
| style="border-bottom:1px solid darkgray; padding-left:12px" | Concentric
|-
| style="border-bottom:1px solid darkgray; padding-left:12px" | Readily accessible
|-
| style="border-bottom:1px solid darkgray; padding-left:12px" | Nonangulated segment (<45°)
|-
| style="border-bottom:1px solid darkgray; padding-left:12px" | Smooth contour
|-
| style="border-bottom:1px solid darkgray; padding-left:12px" | Little or no calcification
|-
| style="border-bottom:1px solid darkgray; padding-left:12px" | Less than totally occlusive
|-
| style="border-bottom:1px solid darkgray; padding-left:12px" | Not ostial in location
|-
| style="border-bottom:1px solid darkgray; padding-left:12px" | No major side branch involvement
|-
| style="border-bottom:1px solid darkgray; padding-left:12px" | Absence of thrombus


|-
| style="border-bottom:1px solid darkgray" | '''Type B lesions (moderately complex)<sup>&lowast;</sup>'''
|-
| style="border-bottom:1px solid darkgray; padding-left:12px" | Tubular (length 10 to 20 mm)
|-
| style="border-bottom:1px solid darkgray; padding-left:12px" | Eccentric
|-
| style="border-bottom:1px solid darkgray; padding-left:12px" | Moderate tortuosity of proximal segment
|-
| style="border-bottom:1px solid darkgray; padding-left:12px" | Moderately angulated segment (&gt;45&deg;, &lt;90&deg;)
|-
| style="border-bottom:1px solid darkgray; padding-left:12px" | Irregular contour
|-
| style="border-bottom:1px solid darkgray; padding-left:12px" | Moderate or heavy calcification
|-
| style="border-bottom:1px solid darkgray; padding-left:12px" | Total occlusions &lt;3 mo old
|-
| style="border-bottom:1px solid darkgray; padding-left:12px" | Ostial in location
|-
| style="border-bottom:1px solid darkgray; padding-left:12px" | Bifurcation lesions requiring double guide wires
|-
| style="border-bottom:1px solid darkgray; padding-left:12px" | Some thrombus present


|-
|-
|<!--col1--><small>image</small>
| style="border-bottom:1px solid darkgray" | '''Type C lesions (severely complex)'''
|<!--col2--><small>image</small>
|-
|<!--col3--><small>image</small>
| style="border-bottom:1px solid darkgray; padding-left:12px" | Diffuse (length &gt;2 cm)
|<!--col4--><small>image</small>
|-
| style="border-bottom:1px solid darkgray; padding-left:12px" | Excessive tortuosity of proximal segment
|-
| style="border-bottom:1px solid darkgray; padding-left:12px" | Extremely angulated segments &gt;90&deg;
|-
| style="border-bottom:1px solid darkgray; padding-left:12px" | Total occlusions &gt;3 mo old and/or bridging collaterals
|-
|-
|<!--col1-->[[Image:JJ00009.jpg|200px]]
| style="border-bottom:1px solid darkgray; padding-left:12px" | Inability to protect major side branches
|<!--col2-->[[Image:JJ00010.jpg|200px]]
|<!--col3-->[[Image:JJ00011.jpg|200px]]
|<!--col4-->
|-
|-
|<!--col1--><small>image</small>
| style="border-bottom:1px solid darkgray; padding-left:12px" | Degenerated vein grafts with friable lesions
|<!--col2--><small>image</small>
|<!--col3--><small>image</small>
|<!--col4-->
|}<!--end wikitable-->


|-
| <ul>
<li><sup>&lowast;</sup> Although the risk of abrupt vessel closure may be moderately high with Type B lesions, the likelihood of a major complication may be low in certain instances such as in the dilation of total occlusions &lt;3 mo old or when abundant collateral channels supply the distal vessel.</li>
</ul>


 
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Latest revision as of 05:54, 17 September 2009

Table 2

Characteristics of Type A, B, and C Lesions
Lesion-Specific Characteristics
Type A lesions (minimally complex)
Discrete (length <10 mm)
Concentric
Readily accessible
Nonangulated segment (<45°)
Smooth contour
Little or no calcification
Less than totally occlusive
Not ostial in location
No major side branch involvement
Absence of thrombus
Type B lesions (moderately complex)∗
Tubular (length 10 to 20 mm)
Eccentric
Moderate tortuosity of proximal segment
Moderately angulated segment (>45°, <90°)
Irregular contour
Moderate or heavy calcification
Total occlusions <3 mo old
Ostial in location
Bifurcation lesions requiring double guide wires
Some thrombus present
Type C lesions (severely complex)
Diffuse (length >2 cm)
Excessive tortuosity of proximal segment
Extremely angulated segments >90°
Total occlusions >3 mo old and/or bridging collaterals
Inability to protect major side branches
Degenerated vein grafts with friable lesions
  • ∗ Although the risk of abrupt vessel closure may be moderately high with Type B lesions, the likelihood of a major complication may be low in certain instances such as in the dilation of total occlusions <3 mo old or when abundant collateral channels supply the distal vessel.
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