lv lead implantation tools: choices of lv leads
TRANSCRIPT
LV lead implantation tools: Management of complex
anatomy
June 19, 2016振興醫院 心臟內科 張鴻猷醫師
Getting Started
Getting Started
• Backup pacing should be readily available (LBBB + RBBB = complete heart block)
• RV lead first Can be used to provide backup pacing May also provide a landmark for coronary sinus Helps to visualize tricuspid valve, which can help locate CS ostium May be more difficult to cannulate the CS with the lead implanted
• LV lead first May be easier to cannulate the CS Additional method may be necessary to provide backup pacing May be more likely to dislodge when going to place RV lead
Getting Started
• Use preferred method to access subclavian vein
• Use lead introducer ( 9.0 Fr) to maintain access
• Prepare all delivery system components before procedure begins– Flush all lumens with heparinized saline– Flush and test the venogram balloon catheter – Wet the guide wire with heparinized saline
Implant Procedure
Six-Step Implant Process
1. Cannulate coronary sinus
2. Perform venograms
3. Select target vein and leads
4. Place leads
5. Measure final electrical measurements
6. Remove implant tools
1. Cannulate CS
Attain Command Family
RAPIDO Cut-Away Family
MB2Standard or high takeoffs of the CS
MultipurposeStandard or high takeoffs of the CS
Curve allows cradling in a medium to large size RA
Extended HookVertical takeoff of CS
Use with an inner catheter (Attain Select® II) to reach across a large dilated RA
AmplatzBypasses Eustachian Ridge or Thebesian valve near or blocking CS
Common obstacles to a CRT case
• Variable CS ostium location• Dilated right atrium• Valves obstructing catheter or lead
advancement• Severe kinking of the vein• Small vessel size of CS
Best solution: Preprocedural venography
Autopsied HeartsLarge K9 Heart
(approximately the size of normal human heart)
Heart from MIRACLE study patient
Anatomy of The CS –Variations in Height over the RA Floor
• HF pts tended to have higher CS origin than non-HF pts (p<0.001)
• Height of CS origin slightly more variable in HF pts
1.2
0.6
2.2
1.4
0.30
0.5
1
1.5
2
2.5
HF non-HFHe
ight
(in
Cm)
Tough Coronary Sinus Cannulation
Contrast flushing test at LAO in low RAChange sheath of different curveUse coronary angiography catheter (for
example: Amplatz)Deflectable EP catheterLate phase coronary angiography
Cannulate CS
Advancing Deflectable Cath.
CathSheath
LAO: 50oImages compliments of Dr. Randy Lieberman
Valves obstructing catheter or lead advancement
Tricuspid annulus
Coronary sinus
Thebesian valveMembranous valve covering postero-inferior aspect of CS ostium
In 10-20% of cases, can impede CS cannulation
2. Perform CS Venograms
Perform Venogram: tipsPerform Venogram: tips• Consider tracking balloon over a guide wire
• Balloon can be inflated and deflated several times
• Proof shot first
• Prolonged contrast solution (10-20cc) for retrograde filling of vessels, two or more views
Why perform a venogram?
Provide a Visualization of Cardiac Venous Anatomy
Increase Chance of Successful Lead Placement
Insight into size and tortuosity of veins
KNOWN PROBLEMS:-venous trauma (advancing balloon too far)-vein dissection-added risk to patients with renal insufficiency
Complication of VenogramComplication of Venogram
Tamponade
Total occlusion of Coronary Sinus?Total occlusion of Coronary Sinus?
Importance of Multiple Views
Notice the origin of the lateral target vessel
LAO View RAO View
Images compliments of Dr. Seth Worley
Target Lateral Branch
Target Lateral Branch
Collateral filling of cardiac veins
Narrowing or stenotic CS
3. Select Target Vein & LV Lead
Cardiac Veins Anatomy
A. Lateral (marginal) cardiac veinB. Postero-lateral cardiac veinC. Posterior cardiac veinD. Middle cardiac veinE. Great cardiac veinA
BC
D
E
Target: Left ventricular free wall
A
BCD
E
LAO View
Veins in the 2-5 o’clock positions (LAO) are the best
RAO & LAO Venogram
Prioritize Several Target Veins on the Left Postero-Lateral Free Wall
Select vessels that:• Maximize separation between RV and LV
leads• Avoid infarcted myocardium and phrenic
nerve stimulation• Are small enough to securely wedge lead
tip
Lead PlacementLead Placement
AP view LAO 40º view
LAO 40º view shows good LAO 40º view shows good separation between the separation between the
RV and LV leadsRV and LV leads
AP view shows RV AP view shows RV placement near placement near
interventricular septuminterventricular septum
Images compliments of Dr. Daniel Gras
4. Place the LV lead
LV Lead DeliveryLV Lead Delivery
• Select LV lead: Bipolar or unipolar, Curved or straight
• Select delivery system: Stylet driven, Over the wire, Inner sheath
• Similar technique as PCI
• Position the guidewire as distal as possible
• Exchange more stiff wire if more support is needed
• Advance sheath for added support
• Buddy wire technique for acute angulation
Branch vein delivery system
Size:• 7.1 Fr (2.4 mm) Out Diameter• 5.7 Fr (1.9 mm) Inner Diameter• 65 cm length• 90°or 130°Function:• Branch vein selection• Delivery 4 Fr (1.3 mm) LV lead
Select the LV LeadSelect the LV Lead
Attain StarFix®
Attain Ability®
4193
4194
Leads Lead Body Size
Polarity Designed for:
Attain® OTW Model 4193
4 Fr (1.3 mm)
Unipolar Placement in smallerveins with moderate
to great tortuosity
Attain OTW Model 4194
6.2 Fr (2.0 mm)
True bipolar
Easy trackability andpushability in medium to
large veins
Attain Starfix
Model 41955 Fr (1.7
mm)Unipolar Placement in a variety of
vein positions with active fixation (deployable lobes)
Attain Ability
Model 41964 Fr (1.3
mm)Bipolar(dual
electrode)
Improved trackability into smaller veins
Programmable repositioning of pacing
vectors
Attain StarFixAttain StarFix®®
• First active fixation left-heart lead
• More placement options– Vein sizes– Vein locations
• Soft, polyurethane deployable lobes
• 5 Fr lead body, 5.3 Fr electrode with tip seal
Compromise due to Phrenic Nerve Stimulation
Phrenic nerve stimulation can occur in all LV locations and tends to occur more often in
mid-lateral regions where the lead is often targeted for
placement
1. Biffi, M et al. Europace 2012.
Attain® Performa™ FamilyAttain® Performa™ Family
Quadripolar
Short-spacedipole
Special design
S-shape curve
16 Programmable Vectors + VectorExpress™
Programming Flexibility and Reverse Polarity Benefits1,2
1. Medtronic Attain Performa 4598, 4298, 4398 LV Lead manuals.2. Demmer W. VectorExpress Performance Results. Medtronic data on file. January 2013.
21 mm1.3 mm
21 mm
Different CurvesDifferent Curves
Performa S 4598Performa S 4598
Medium to large vessel size
Fixation and tracking through vessel will be different than double cant shape
– Curves oppose each other
– Three curves
Performa Straight 4398Performa Straight 4398
Small vessel size Acute vessel
curvatureEnsure lead is deep
seated and wedged Trackability is
better than 4298 and 4598 due to the distal shape
Attain Performa 4298Attain Performa 4298Medium vessel sizeModerate vessel
curvatureFixation force most
similar to 4196 due to similar construction at proximal cant
Attain® Performa™ 4598
(5.3 F, S- shape)
Attain Performa 4298
(5.3 F, canted)
Attain Performa 4398
(5.3 F, straight with tines)
Large,Low
tortuosity vessels
Small,High
tortuosity vessels
Attain StarFix®
4195 (5 F, deployable
lobes)
Attain Ability® Plus4296
(5.3 F, canted)
Attain Ability4196
(4 F, canted)
Attain Ability Straight
4396(4 F, straight
with tines)
Different Curves vs Cardiac VeinsDifferent Curves vs Cardiac Veins
Coronary venous stents for lead retention
5. Take Electrical Measurements
LV Lead Threshold TestLV Lead Threshold Test
R-wave: ≥ 5.0 mVVoltage threshold @ 0.5 ms: ≤ 3.0 VImpedance @ 5 V/0.5 ms : 250 - 1000 Ohms10 V for phrenic nerve
RV Lead TestRV Lead Test
• R-wave: ≥ 5 mV• Threshold @ 0.5 ms: ≤ 1 V• Impedance @ 5 V/0.5 ms: 250 –1000 Ohms
RA Lead TestRA Lead Test• R-wave: ≥ 2 mV• Threshold @ 0.5 ms: ≤ 1.5 V• Impedance @ 5 V/0.5 ms: 250 –1000 Ohms
ECG Capture TemplatesECG Capture Templates
RV stimulationRV stimulation
Biventricular Biventricular stimulationstimulation
(LV + RV)(LV + RV)
Intrinsic RhythmIntrinsic Rhythm
LV stimulationLV stimulationRVRV
LVLV
PSAPSA ++ --
RVRV
LVLVPSAPSA
RVRV
LVLV
PSAPSA --
++
++
----
6. Remove Delivery System Tools
Prepare for Catheter RemovalPrepare for Catheter Removal
1. Insert a stylet into the lead. 2. Remove the valve.3. Place towels for support.
Slitting the Guiding CatheterSlitting the Guiding Catheter Keep slitter blade in
center of hub and parallel to guide catheter
ALWAYS watch hands during slitting process!
Slitting the Guiding CatheterSlitting the Guiding Catheter
Keep slitter blade parallel with guide catheter hub
Turn your body away from patient, pull catheter in single smooth motion toward your LEFT hip
Conclusion
Thank you for Thank you for your attention !!!your attention !!!