Guidewire Selection for Tight Lesions in Coronary Angioplasty (PCI)

Basic Guidewire Anatomy (Relevant to Choice)

Guidewire Categories and Their Role in Tight Lesions

1. Workhorse Wires (Start Here for Most Tight Lesions)

• Examples: Runthrough NS (Terumo), BMW Universal, Sion (Asahi), Hi-Torque Balanced Middleweight
• Properties: Soft atraumatic tip, moderate support, good torquability, adequate tactile feedback
• Principle: Always start with the least aggressive wire that can safely cross the lesion. A softer wire causes less vessel injury - both at the lesion site and in proximal/distal segments.

2. Polymer-Jacketed / Hydrophilic Wires (For Tight + Calcified or Angulated Lesions)

• Examples:
  • Fielder FC / Fielder XT (Asahi) - very low tip load (0.8g), excellent trackability, hydrophilic body
  • Whisper (Abbott) - hydrophilic tip, good for tight angulated segments
  • Pilot 50 / Pilot 150 (Abbott) - slightly higher tip load, polymer jacket, excellent for tight fibrous lesions
  • Sion Black (Asahi) - hydrophilic, low friction, good for tortuous tight lesions
• Properties: The hydrophilic/polymer coat dramatically reduces friction - letting the wire slide through tight spaces that resist conventional wires. The ideal crossing wire for a heavy calcified tight lesion has a soft tip with polymer/hydrophilic cover or a hybrid design (hydrophobic tip + hydrophilic body).

Key rule: For crossing a tight calcified lesion: use Runthrough, Fielder, Whisper, or Pilot 50.

3. Stiff Tip / High Tip-Load Wires (For Very Tight Fibrous or Near-Occluded Lesions)

• Examples:
  • Miracle Bros 3, 6, 12 (Asahi) - tip loads of 3g, 6g, 12g respectively; hydrophobic tip for tactile feedback
  • Fielder XT-R (Asahi) - tapered tip, 0.6g, for tight microchannels
  • Confianza Pro 12 (Asahi) - very stiff penetrating wire (12g tip load), mainly for CTO caps
• Use: When a soft wire deflects off a hard, tight lesion without crossing; a higher tip load provides the penetrating force needed.
• Caution: Stiff wires carry a higher risk of perforation and dissection. Use only when necessary and with careful technique.

4. Support / Extra-Support Wires (For Device Delivery After Crossing)

• Examples: Iron Man, Hi-Torque Balance HeavyWeight, Mailman, Hi-Torque All-Star, CHOICE Extra Support
• Properties: Very stiff shaft to straighten the vessel and provide a firm rail for device delivery
• Important: These are NOT primarily crossing wires. The standard approach is to first cross with a workhorse wire, then exchange to a support wire via microcatheter. All balloon/stent delivery should occur over a workhorse or support wire - NOT over a hydrophilic or CTO wire.

Step-by-Step Approach to a Tight Lesion

Tight lesion identified
         |
Step 1: Attempt crossing with WORKHORSE wire
(Runthrough, BMW, Sion)
         |
         ├─ Success → Deliver devices over workhorse
         |
         └─ Failure (fibrous/calcified/angulated)
                  |
Step 2: Escalate to POLYMER-JACKETED / HYDROPHILIC wire
(Fielder FC/XT, Whisper, Pilot 50, Sion Black)
                  |
                  ├─ Success → Exchange back to workhorse before stent delivery
                  |
                  └─ Failure (very tight, hard cap, sub-total)
                           |
Step 3: Try STIFF-TIP wire
(MiracleBros 3→6→12, Confianza Pro)
                           |
                           └─ If device delivery is still difficult after crossing:
                              Exchange to EXTRA-SUPPORT wire via microcatheter
                              (Iron Man, Mailman, HeavyWeight)

Special Scenarios

Critical Principles to Remember

1. Always start soft: A softer, less aggressive wire has a lower risk of causing vessel injury (dissection, perforation, pseudolesion).
2. Hydrophilic/polymer jacket = better trackability through tight spaces but reduced tactile feedback. Use carefully near side branches.
3. Never deliver stents over a CTO or hydrophilic wire - always exchange for a workhorse wire before balloon/stent delivery to avoid pseudolesions and wire bias.
4. Microcatheter-assisted wire exchange is the gold standard for changing wire type without losing lesion position.
5. Buddy wire technique: A second wire advanced parallel to the first (or into a side branch) straightens the vessel and provides a firm rail for equipment delivery through tight lesions.
6. Avoid stiff wires in heavily calcified vessels for device delivery - they can create wire bias and paradoxically hinder stent passage.

Key Wire Examples by Brand