心臟植入性電子儀器(cied)之歷史"cied overview"_20131019南區
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History and Overview of Cardiac Implantable Electronic Devices
成大醫院心導管室放射師 王亦聖
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Contents Brief of cardiac pacing Overview of battery and generator Lead technology Pacemaker Mode and NBG code
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ECG history
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History of Pacemaker
1958, Siemens-Elema In 1994 Siemens sold its entire pacemaker business to the American company St. Jude Medical
Arne Larsson
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History of Pacemaker
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Indications and CIED Products
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Pacemaker
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Modern Pacemaker
Fully programmable dual chamber pacing Rate response to activity and metabolic changes Telemetry of pacer function Incorporated algorithms to respond to change in
intrinsic rhythms Store patients arrhythmic events
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Pacing System
+
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Pacemaker Components
Connector
Electric component
Battery
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Mercury-ZincBattery
Battery Technology
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Lithium BatteryBattery TechnologyLi-I battery
3,0
[V]
[Ah]
Lithiumiodine
Phase 1 Phase 2
Phase 3
30 µA
2,0 1.8 V
1,0
0 1 2 3 4
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Pacing Lead Unipolar
• Large spike• More sensitive to interference• Pectoral muscle stimulation• More susceptible to EMI• Smaller lead diameter
Bipolar• Small spike• More sensitive to intrinsic
cardiac signals• No myopotential inhibition• EMI protected• Less crosstalk
Cathod “-”
Anode “+”
Anode “+”
Cathod “-”
Unipolar
Bipolar
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Pacing Lead
Passive lead Tined lead
Active lead Screwed lead
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Steroid Delivery MCRD steroid
(Monolithic Controlled Release Delivery) < 1 mg Dexamethasone
Sodium Phosphate
3.53.02.52.01.51.00.5
0 4 8 12 16 20 52
Amplitude (Volt)
Weeks
With steroid
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Myocardial and Epicardial Leads Leads applied directly to the
heart Fixation mechanisms include:
Epicardial stab-in Myocardial screw-in Suture-on
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Fundamentals of Electricity
Ohm’s Law
U = I X RU = Voltage (Volt, V)I = Current (Ampere, A)R = Resistance ( Ohm, )
6 V
I = 6 / 3 = 2 A
12 V
I = 12 / 6 = 2 A
3 6
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Pacing Impedance
Insulation Defect
<250 Ohm
Normal Pacing Impedance300 Ohm~1500 Ohm
Lead fracture
>1500 Ohm
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Battery Capacity and Longevity
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How pacemaker works Pacing : Amplitude (V), Pulse width (ms)
Capture
Noncapture
Pulse Width (ms)
Pu
lse Am
plitu
de (V
)
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How Pacemaker Works Sensing- Choosing sensitivity
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Sensitivity5.0 mV
Sensitivity 1.0 mV
Sensitivity10.0 mV
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Considerations in Sensitivity Programming To make the device more sensitive (to pick up signals it
might be missing), lower the mV setting To make the device less sensitive (to avoid detecting non-
cardiac signals), increase the mV setting Sensitivity should
Pick up low-amplitude cardiac signals Avoid very low-amplitude non-cardiac signals
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NBG Code
I II III IV V
Chamber(s) Paced
Chamber(s) Sensed
Response to Sensing
Rate Modulation
Multisite Pacing
O = None
A = Atrium
V = Ventricle
D = Dual (A + V)
O = None
A = Atrium
V = Ventricle
D = Dual (A + V)
O = None
T = Triggered
I = Inhibited
D = Dual (T + I)
O = None
R = Rate modulation
O = None
A = Atrium
V = Ventricle
D = Dual (A + V)
NASPE/BPEG Generic NASPE is the North American Society of Pacing and Electrophysiology
BPEG is the British Pacing and Electrophysiology Group
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Mode Selection Considerations
Status of Atrial Rhythm Intrinsic Presence of Atrial
Tachyarrhythmias: Acute/Chronic
Status of AV Conduction Normal Slowed Blocked
Presence of Chronotropic Incompetence
Single Chamber ?
Dual Chamber ?
Rate Modulation?
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ICD
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History of the AICD
1969 - Dr. Mirowski and Dr. Morton Mower begin collaborating and develop the first experimental model
MilestonesMilestones
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History of AICD Therapy
1975 - The first device is implanted and tested in an animal
1980 - The first patient is implanted with an AICD device
MilestonesMilestones
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Whats Inside an ICD?
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ICD Leads-DF1 and IS-1
Two DF-1, One IS-1
DF-1 (Shock)IS-1 (Pace/ Sense)
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DF4 Development History Project began in 2004 First submissions September 2007
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Dual Coil Lead
Proximal Shock
Electrode
Distal Shock
Electrode
Single Coil Lead
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Dual coil v.s. Single coil
Dual Coil Single Coil
Advantange Lower DFT May easier to remove
Disadvantage Difficult to remove
Higher DFT
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ICD Modules
Special Functions
Measurements
Electrogram and Data Storage
Rev
ersi
on
Cla
ssif
icat
ion
Sen
sin
gInduction
Th
erap
y
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TherapyHigh Voltage shock
Uses of High Voltage Therapy To terminate:
Ventricular Tachycardia Ventricular Fibrillation
Thanks, I needed that!
Phase 1
Phase 2
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TherapyAnti-tachycardia pacing (ATP)
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PVT
Detection - Fixed Gain/ Sensitivity
NSR
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Automatic Sensitivity Control (ASC)
Automatic Sensitivity Tracking
GAINFILTER COMP
THRESHOLD
Sensed EventFrom Sense/Pace Leads
Threshold adjusts+ and - to adapt
to the signal
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Defib with slow VT and Fast VT
Tach B(Fast VT)
(ATP andCV Shocks)
Treatment
375 ms(160 bpm)
Sinus
Tach A(Slow VT)
(ATP andCV Shocks)
Fib
(Shock)
Non-Treatment Treatment Treatment
500 ms(120 bpm)
300 ms(200 bpm)
>500 ms(<120 bpm)
No therapySVT discrimination, VT therapy deliver when VT indicated
VF therapy deliver
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CRT (Cardiac Resynchronization Therapy)
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Ventricular Resynchronization with CRT
Pacing @ left lateral free wall in addition to right side
Symmetric lateral and septal wall conduction & contraction
More efficient pump
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Coronary Sinus approach
Right Atrial Lead
Right Ventricular Lead
Left Lateral Free wallLV Lead
Optimal LV Lead Placement
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Venograms and LV Lead Placement
LAO AP RAO
Align to CS OS/ Middle Vein
Anterior
Lateral
Posterior
Right
Basal
MidApical
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Final LV Lead Position
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Final LV Lead Position
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Thanks for your attention