Coronary guidewires
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Transcript of Coronary guidewires
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CORONARY GUIDEWIRES
CHOICE & APPROPRIATE USE IN PCI
Dr Vallabhaneni Sri Ram BhupalNIMS,Hyderabad,India
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CONTENTS
• COMPONENTS OF A GUIDE WIRE• CLASSIFICATION• WIRES FOR DIFFERENT OCCASIONS• GUIDEWIRE MANIPULATION• COMPLICATIONS
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•GRUNTZIG First performed Angioplasty in 1974 •1977 – First coronary angioplasty•Polyvinyl Chloride balloon catheter with short guidewire attached to its tip
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•1982 – Simpson reported First experience with over the balloon system•It had an independently movable guidewire within the balloon dilation catheter
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Purpose
• To reach far end of the vessel• To rail the devices into coronaries • To access the lesion• To cross the lesion atraumatically• To provide support for interventional devices
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4 KEY characteristics1. Torque control
Is an ability to apply rotational force at a proximal end of a guidewire and have that force transmitted efficiently to achieve proper control at the distal end
2. Trackability Is an ability of a wire to follow the wire tip around curves and bends without bucking or kinking, to navigate anatomy of vasculature
3. Steerability Is an ability of a guidewire tip to be delivered to the desired position in a vessel
4. Flexibility Is an ability to bend with direct pressure
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Other features 5. Prolapse tendency
Tendency of the body of a wire not to follow the tip around bends
6. Radiopacity/visibility Is an ability to visualise a guidewire or guidewire tip under fluoroscopy.
7. Tactile feedback Is tactile sensation on a proximal end of a guide wire that physician has that tells him what the distal end of the guidewire is doing
8. Crossing Is an ability of a guidewire to cross lesion with little or no resistance
9. Support Is an ability of a guidewire to support a passage of another device or system over it
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STRUCTURE
CORE-Material Diameter Core taper TIP COILS, COVERS & COATINGS
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Core
• Inner part of the guidewire• Extends through the shaft of the wire from the
proximal to the distal part• Distal taper• Stiffest part of the wire that gives stability and
steerability
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Core Material Core material affects the flexibility, support, steering
and trackability • Stainless steel
– superior torque characteristics, can deliver more push, provides good shapeability and excellent support
– more susceptible to kinking and is less flexible• Nitinol
– pliable but supportive, less torquability than SS– generally considered kink resistant & have a tendency
to return to their original shape, making them potentially less susceptible to deformation during prolonged use
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Core Diameter• Influences the performance of the wire• Larger diameter improves support and allows 1:1
torque response• Smaller diameter enhances the flexibility
Core taper• Variable length• Continuous/segmented• Short taper and smaller number of wide spaces
gradual tapers increases support and transmission of push force
• Longer tapers and larger numbers of segmented tapering increases flexibility
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Tip
• Tapers distally to a variable extent – 2-piece core- distal part of core does not reach
distal tip of wire→ shaping ribbon, extends to distal tip
– 1-piece core- tapered core reaches distal tip.• 2-piece→ easy shaping & durable shape
memory• 1-piece →better force transmission to tip &
greater “tactile response” for operator
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Coils, Covers & Coating
Keeps the diameter at .014 inch• Coils
– Stainless steel– Outer coil Design – Coils placed over tapered core and tip
of the wire– Tip coil Design – Tip alone is covered with coils– Flexibility, support, steering, tracking, visibility & tactile
feedback– Radio opaque platinum coils– Intermediate coils placed on the working length of the wire
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Coils
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Radio-opaque tip
• Visibility of the wire tip is provided by radiopaque platinum coils that are usually placed at the distal tip 2 to 3 cm in length, but maybe much longer.
• Galeo Wires – 3 cm distal radio-opaque tip.• BMW wire – 3 cm distal radio-opaque tip
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• Covers– Polymer or plastic– Lubricity
• Coating– Distal half– Affects lubricity and tracking– Creates tactile feel– Reduces friction – Facilitates movement of wire within the vessel and
deliverability of intervention equipment
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Non-Coated / Hydrophobic wires
Pros• More controllable (and therefore less likely to dissect)• Provide better tactile feel
Cons• Poor trackability• Wire tip becomes stiffer, torque response increases,
but less tip resistance is transmitted to the operator, making it easier to enter a false channel.
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• Hydrophobic coatings are silicone based coatings which repel water and are applied on the working length of the wire, with the exception of the distal tip. They require no activation by liquids to create a "wax-like" surface and to achieve the desired effect— to reduce friction and increase trackability of the wire. Silicone coating has higher friction, more stable feel inside the vessel.
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Hydrophilic• Applied over the entire working length of wire
including tip coils• Attracts water - needs lubrication• Thin, non slippery, solid when dry→ becomes a gel
when wet– ↓friction– ↑trackability– ↓Thrombogenic↓tactile feel- ↑risk of perforationTendency to stick to angioplasty cath
• Useful in negotiating tortuous lesions and in “finding microchannels” in total occlusions
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Shapeability and shaping memory
• Shapeability - allows to modify its distal tip conformation
• Shaping memory - ability of tip to return back to its basal conformation after having been exposed to deformation & stress– Both do not necessarily go in parallel– SS core wires -easier to shape (↑memory- nitinol
core)– 2-piece core + shaping ribbon - easier to shape &
↑memory
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HOW TO CLASSIFY CORONARY GUIDE WIRES?
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CLASSIFICATION
• NO UNIFORM CLASSIFICATION • BUT SOME CATEGORISATION
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Table 14 Categorisation/classes of guidewires
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Classification
Based on Tip Flexibility• Floppy – Eg:- Hi torque balance middle weight, Hi
torque balance,Choice floppy• Intermediate – Eg:- Hi torque intermediate,
Choice intermediate• Standard – Shinobi, Boston ScientificBased on Device support• Light – Eg:- Hi torque balance• Moderate – Eg:- Hi torque balance middle Weight• Extra support – Eg:- Hi torque whisper,Choice
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“Support”
• Indicator of the core strength
• More stronger the core – more support
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Floppy
ES – Extra-Support
Grand-Slam
Iron-man
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Based on coating• Hydrophilic : Eg:- CholCETM PT Floppy• Hydrophobic : Eg:- Asahi softDepending on tip load• Floppy, Balanced & Extra support
• Tip load - force needed to bend a wire when exerted on a straight guide wire tip, at 1 cm from the tip– Floppy - <0.5g– Balanced – 0.5-0.9g– Extra support - >0.9g
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BASED ON CLINICAL SCENARIO
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Commonly Used Workhorse Guidewires
• ATW/ATW Marker• Stabilizer• BMW / BMW Universal• Zinger• Cougar XT• Asahi Light / Medium• Asahi Standard• Asahi Prowater Flex• Choice Floppy• Luge• IQ• Forte Floppy• Runthrough NS• Galeo
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Balance Middleweight Universal wire (Abbott Vascular/Guidant, Santa Clara, CA)
• Quite steerable - tip is suitable for bending in a “J” configuration for distal advancement into the distal vessel bed with minimal trauma while still maintaining some torque
• shape retention relatively poor -any J configuration tends to become magnified over time → consequent loss in steerability
• moderately torquable- progression - minimal friction (light hydrophilic coating) - Dye injection may also be helpful to propagate distal advancement
• suitable for rapid, uncomplicated interventions• low risk to cause dissections/distal perforations• support - low to moderate
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CHOICE FLOPPY
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SELECTION OF GUIDEWIRES FOR SPECIAL LESIONS
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The selection of a guidewire
• Essential component
• INFLUENCED BY• vessel anatomy• the lesion morphology• the devices to be used• operator's experience and preference.
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LEFT MAIN PCI
• The choice of a guidewire is not of critical importance.
• Wire selection usually includes spring tip guidewire designed for frontline lesions, for example, ChoICE™ Floppy (Boston Scientific), Hi-Torque Balance Middleweight (Abbott Vascular)
• FOR LEFT MAIN OR RCA OSTIAL PCI AN EXTRASUPPORT WIRE IS PREFERED
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BIFURCATION PCI
• In the presence of difficulties accessing the side branch some hydrophilic wires such as the ChoICE™ PT Floppy (Boston Scientific), PT Graphix™ (Boston Scientific) or Asahi Fielder (Abbott Vascular) may become useful.
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• These wires have higher risk to perforate the distal vessel if allowed to migrate into small side branches or too distally. Therefore it is important to monitor the distal position of the wire tip. These wires also should not to be jailed because of the risk of wire rupture during pullback.
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MAIN VESSEL TRACKING
Short tapering better
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DISSECTIONS
• ChOICE Floppy • Asahi Soft .• The parallel wire technique can be recommended
if a dissection plane is entered with the first wire
• Ochiai M, Ashida K, Araki H, Ogata N, Okabayashi H, Obara C. The latest wire technique for chronic total occlusion. Ital Heart J 2005;6:489-93..
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CALCIFIED LESIONS
• ChoICE Floppy (Boston Scientific).• If it fails to cross the lesion, the next step is to
choose floppy hydrophilic wire such as the ChoICE PT Floppy (Boston Scientific) or Asahi Fielder (Abbott Vascular)
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TORTUOUS ANATOMY
• Very floppy wire with support for device delivery could be used
• BMW • FIELDER FC• WHISPER ES• WIGGLE WIRE
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CTO WIRES
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CLASSIFICATION OF CTO WIRES
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CTO guide wire techniques
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Lesion specific CTO approaches
SLIDING
Micro-channels present
CTO’s < 6 months
ISR total occlusions
STAR technique
Hydrophilic wiresFielder,CrosswireNT, HT Pilot, Whisper, Choice PT
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Lesion specific CTO approaches
DRILLING (controlled)
“Workhorse technique”
Most CTOs with discrete
entry point after initial attempt
with soft (intermediate wires)
Stiff , hydrophobic non-tapered wires
MiracleBros (3 g, 4.5 g and 6 g), Persuader (3 g and 6 g)
and Cross-IT XT (100/200/300)
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Lesion specific CTO approaches
Penetration
• Blunt entry point
• Heavily calcific or resistant lesions
• Alternative to “drilling” as the
“work horse technique” after initial soft wire failure
Super stiff tapered wires
Conquest Pro (9 g, 12 g), Cross-IT XT
400, MiracleBros 12
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GUIDEWIRES FOR RETROGRADE TECHNIQUES
– Fielder/FielderFC – X -treme – Whisper – ChoICE PT2– Runthrough / Runthrough Hypercoat
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COMMONLY USED CTO WIRES
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Fielder™ / Fielder FC™ (Asahi Intec Co.)
• Special guidewire - distal coil coated with polymer sleeve & further coated with a hydrophilic coating
• Provides advanced slip performance & trackability for highly stenosed lesion & tortuous vessels
• Very good torque performance • Combines both slide and torque performance • Primary wire used in the retrograde technique of
recanalization of CTO
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Whisper
• Durasteel™ Core-to-tip designed to improve steering, durable shape retention and tactile feedback
• Full Polymer cover with Hydrophilic coating intended for deliverability and smooth lesion access
• Responsease™ “transitionless” core grind designed to provide improved tracking and better torque response
• Tip coils designed to provide softer, shapeable tip and also improve tactile feedback
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SUMMARY OF WIRES
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WORKHORSE WIRES
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EXTRA SUPPORT WIRES
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CTO WIRES
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Guidewire Manipulations
• Two step process• Shaping the wire tip
– It minimizes the amount of force applied to the wire
– For steering into the vessel– For visualization of torquing effort
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Shaping the Wire Tip
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Steering of the wire
• Small alternating rotations to left and right• Excessive rotations should be avoided to
prevent wire tip fracture
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Optimum guide wire positioning
• Should be placed as distally as possible in the target vessel
• Allows extra support when crossing with balloon/stent catheters
• ↓ chance of the wire becoming displaced backwards across the lesion and necessitating re-crossing
Avoid vessel perforation when positioning wires with hydrophilic coatings very distally
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Strategies if Guidewire fails to cross
• Make the guide more coaxial with the lumen of the artery
• Use a balloon to direct the wire• Modify the bend at the tip of the wire• Change the wire
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Complications• Vessel perforations
– Uncommon <1%– Risk factors
• Hydrophilic wires, core to tip• Chronic total occlusions
– Diagnosis• Angiographic diagnosis• Small extraluminal extravasation of blush in the distribution
of target vessel• Emergency echo to r/o pericardial effusion and tamponade
– Prognosis• Extend of extravasation into pericardium
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– Classification• Type I – Extraluminal crater without extravasation• Type II – Containing pericardial or myocardial
blushing • Type III - having≥ 1 mm diameter with contrast
streaming: and cavity spilling– Management
• Reversal of anticoagulations• Prolonged balloon inflation• PTFE covered stent• Coil embolization• Use of gel foams
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Pseudolesions/Concertina effect• Stenosis that appears in any artery after the coronary
guidewire is placed in the artery• Appears in tortuous vessels that have been straightened
out by the guidewire
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Diagnosis• Will disappear if the wire is withdrawn• Replacement of a stiff wire with a flexible floppy
wire eliminates pseudolesion• Microcatheter or a balloon catheter can be
placed distal to the lesionComplications• In some cases cause hemodynamic compromise
and ischemia
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Guidewire Entrapment
Factors• Presence of calcified vessels (Eg:- RCA)• Repeated use of wire for multiple interventions• Repeated attempts at crossing the same lesion
multiple times with the same wire• Two wires my become entrapped when the
“Buddy wire” technique is used• Crossing fresh stent struts
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Management
• Advance a small profile balloon or a small caliber catheter (transit catheter) to the attachment site and pull back gently
• When a second or “buddy wire” gets trapped between a stent and the vessel wall gentle traction can be used
• Surgery
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Guidewire fracture and Embolization
• Risk factors are calcified lesion, bifurcation stenting and prolonged procedures
• Management– Surgery– Snaring the Embolized wire fragment
• The Amplatz Gooseneck Microsnare• The EnSnare Triple Loop Device• The X Pro Micro Elite Snare• The Alligator Retrieval Device
– Push and paste
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THANK YOU
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Husband must obey wife but not reverse
• Operator is husband until his guide wire is not in coronary artery but then you know …..