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2CARDIMACARDIMA®®
FDA Advisory Panel MeetingFDA Advisory Panel Meeting
May 29, 2003May 29, 2003
Cardima®, Inc.Linear Ablation REVELATION® Tx Microcatheter RF Ablation System
3CARDIMACARDIMA®®
Panel PresentationPanel Presentation
Corporate Profile Marianne Baldwin Treatment Options for
Atrial Fibrillation Neal Kay, M.D. Pre-clinical Studies Hugh Calkins, M.D. Protocol Development Hugh Calkins, M.D. Clinical Study Results Abe Kocheril, M.D. Conclusions Neal Kay, M.D.
4CARDIMACARDIMA®®
Indications for UseIndications for Use
Cardima®, Inc., REVELATION® Tx Microcatheter Ablation System is indicated for the treatment of atrial fibrillation in patients with drug refractory paroxysmal atrial fibrillation by mapping, pacing, and ablating with a set of continuous linear lesions in the right atrium.
5CARDIMACARDIMA®®
Since 1993 Cardima has been developing, manufacturing and marketing catheter-based systems for the Electrophysiological field, exclusively.
The catheters include the PATHFINDER™ family of mapping devices, the VENAPORT®, VUEPORT® and NAVIPORT® guiding catheters and the REVELATION® family of mapping and ablation systems.
Cardima BackgroundCardima Background
6CARDIMACARDIMA®®
Currently the company is marketing its diagnostic and guiding catheters in the USA, Canada, EU (CE Mark) and Japan.
The REVELATION® mapping and ablation family of devices is marketed in Canada and EU (CE Mark).
Cardima BackgroundCardima Background
7CARDIMACARDIMA®®
Diagnostic Microcatheters PATHFINDER™ (1997) PATHFINDER™ mini (1998) REVELATION® (1998) TRACER™ (1999)
Guide Catheters VENAPORT® (1995) NAVIPORT® (1998) VUEPORT® (1998)
Surgical Ablation System (2002)
Cardima Commercially Available Products (US)Cardima Commercially Available Products (US)
8CARDIMACARDIMA®®
PATHFINDER™ Mapping CatheterPATHFINDER™ Mapping Catheter
PATHFINDER™ mini
PATHFINDER™
9CARDIMACARDIMA®®
REVELATIONREVELATION®® Series Series
REVELATIONREVELATION®® Tx Tx
10CARDIMACARDIMA®®
Guide CatheterGuide Catheter
NAVIPORT®
8Fr deflectable lumen catheter
11CARDIMACARDIMA®®
Technology ComparisonTechnology Comparison
FEATURES REVELATION® TX CONVENTIONAL RF
Core Construction Angioplasty guidewire technology
Plastic tube
Manufacturing From the “outside-in” From the “inside-out”
Flexibility Very flexible and torqueable
Stiff, deflectable
Electrode Type Fine-wire coiled Sleeve
Ablation Electrode Number
Eight One
Lesion Type Linear Focal
Power Req’d 7-35 W 50-70 W
12CARDIMACARDIMA®®
Lesion Shape ComparisonLesion Shape Comparison
Conventional Endocardial“Hot Tip” Catheter
Cardima LinearCoil Electrode
Tip AblationElectrode Coil Ablation
Electrode
13CARDIMACARDIMA®®
Linear Lesion FormationLinear Lesion Formation
Coil AblationElectrode Thermocouple
14CARDIMACARDIMA®®
Treatment Options for Atrial FibrillationTreatment Options for Atrial Fibrillation
G. Neal Kay, M.D.Professor of Medicine
Director of ElectrophysiologyUniversity of Alabama at Birmingham
Birmingham, AL
15CARDIMACARDIMA®®
US and AF Age DistributionUS and AF Age Distribution
Feinberg WM. Arch Intern Med 1995;155:469-473.
U.S. population
Population withatrial fibrillation
Age, yr
<5 5-9
10-14
15-19
20-24
25-29
30-34
35-39
40-44
45-49
50-54
55-59
60-64
65-69
70-74
75-79
80-84
85-89
90-94
>95
U.S. populationx 1000
Population with AFx 1000
30,000
20,000
10,000
0
500
400
300
200
100
0
16CARDIMACARDIMA®®
J Am Coll Cardiol. 2001;38:1231-1265. Fuster V, Rydén LE, Asinger RW, et al. ACC/AHA/ESC guidelines for the management of patients with atrial fibrillation: a report of the American College of Cardiology/American Heart Association Task Force on Practice Guidelines and the European Society of Cardiology Committee for Practice Guidelines and Policy Conferences (Committee to Develop Guidelines for the Management of Patients With Atrial Fibrillation.) J Am Coll Cardiol. 2001;38:1231-1265.
Classification of Atrial FibrillationClassification of Atrial Fibrillation
ACC/AHA/ESC GuidelinesACC/AHA/ESC Guidelines
Persistent(Not self-terminating)
Paroxysmal(Self-terminating)
Permanent
First Detected
17CARDIMACARDIMA®®
d,l-Sotalol vs Placebo for AF/AFl:d,l-Sotalol vs Placebo for AF/AFl:Time to Symptomatic Recurrence of AF/AFlTime to Symptomatic Recurrence of AF/AFl
P values are vs placebo.Benditt Am J Cardiol 1999;84:270-277.
Placebo (n=69)
Sotalol 160 mg bid (n=62)
Sotalol 120 mg bid (n=63)
Sotalol 80 mg bid (n=59)
Time (days)
Rec
urre
nce-
Fre
e S
urvi
val
0.5
0.7
0.8
0.9
1.0
0.6
0.1
0.2
0.3
0.4
0.0
0 30 60 90 120 150 180 210 240 270 300 330 360 390
P=.029
P=.325
P=.018
18CARDIMACARDIMA®®
Canadian Trial of Atrial Fibrillation (CTAF)Canadian Trial of Atrial Fibrillation (CTAF)
* Excluded recurrence in first 21 days. Roy, et al NEJM 2000;342:913-920.
Pat
ient
s W
itho
utR
ecur
renc
e, %
100
80
60
40
20
0 1000
200 300 400 500 600
Amiodarone 10 mg/kg x 2 wk, 300 mg x 4 wk, 200 mg/d (n=201)
Propafenone 300-450 mg/d (n=101)
Sotalol 160 mg bid or 80 mg tid (n=101)
Days of Follow-up
19CARDIMACARDIMA®®
Antiarrhythmic DrugsAntiarrhythmic Drugs
CHF
AmiodaroneDofetilide
Non-Pharmacologic Options
Coronary Artery Disease
Sotalol
AmiodaroneDofetilide
HTN
LVFW > 1.4 cm
Yes No
Amiodarone Type 1C
AmiodaroneDofetilide
Sotalol
20CARDIMACARDIMA®®
Right Sided Approach to AFRight Sided Approach to AF
These results demonstrate that there is a place for These results demonstrate that there is a place for right sided treatment of AFright sided treatment of AF
Cardima has demonstrated this approach in a Cardima has demonstrated this approach in a clinical studyclinical study
21CARDIMACARDIMA®®
Pre-clinical StudiesPre-clinical Studies
Hugh Calkins, M.D.Professor of Medicine
Director of ElectrophysiologyThe Johns Hopkins Medical Center
Baltimore, MD
22CARDIMACARDIMA®®
Pre-Clinical StudiesPre-Clinical Studies
Biocompatible
Compliant with applicable ISO 10993 requirements
Reliable
Compliant with mechanical and electrical performance requirements of Massi guidelines
23CARDIMACARDIMA®®
Animal StudiesAnimal Studies
Studies submitted in support of PMA
David Keane, M.D. / Massachusetts General Hospital
Performance of REVELATION® Tx in Right Atrium of a Goat (n=7)
Mauricio Arruda, M.D. / University of Oklahoma
Performance of REVELATION® Tx in the right atrium of a Canine (n=6)
RF Lesion Formation of REVELATION® Tx in Canine Thigh Muscle (n=2)
RF Ablation Using the NavAblator™ in the Right Atrium (n=6)
Additional independent studies performed………..
24CARDIMACARDIMA®®
Right Atrial Multipolar Catheter Ablation ofAtrial Fibrillation in a Pace-Induced Goat Model
Keane D, Guerrero L, Ettelson L, McGovern B, Ruskin JJACC 1997;32A.
• 8 goats• AF (> 5 min) inducible at baseline• 4 linear lesions with Cardima microcatheters• AF no longer inducible in 8 of 8 goats• Transmural linear lesions were achieved
25CARDIMACARDIMA®®
Can Microcatheters Produce Linear Lesions without Can Microcatheters Produce Linear Lesions without Sacrificing Transmurality in the Canine Atrium?Sacrificing Transmurality in the Canine Atrium?
Asirvatham S, Mayo FoundationCirculation 1999; 100(18):1-374
• 14 dogs• Linear right and left atrial lesions with Cardima microcatheters• 30 linear lesions with 8 pole 3.7 Fr microcatheters• 36 linear lesions with 10 pole 4mm ablation catheter
Ablation Strategy Cardima vs Stnd multipolar abl catheterWidth 4.2+1 vs 5.4 + 1.6Depth 1.4 + 0.6 versus 1.3 + 0.7Volume 29 +15 versus 42 + 62Lesion formation 98% vs 95%Transmural lesion 89% vs 85%
26CARDIMACARDIMA®®
NavAblator Canine StudyNavAblator Canine StudyUniversity of OklahomaUniversity of Oklahoma
Mauricio ArrudaMauricio Arruda
• 6 dogs• NavAblator catheter for isthmus ablation
Lesion length: 20 – 30 mmLesion depth: 1.0 to 3.5 mmComplete linear isthmus lesion in 5 of 6 dogs
27CARDIMACARDIMA®®
Prospective Comparison of Lesions Created Using a Multipolar Prospective Comparison of Lesions Created Using a Multipolar Microcatheter Ablation System with Those Created Using Microcatheter Ablation System with Those Created Using
a Pullback Approach with Standard RF Ablation a Pullback Approach with Standard RF Ablation In the Canine AtriumIn the Canine Atrium
Jumrussirikil P, Atiga W, Lardo A, Berger R, Halperin H, Hutchins G, Calkins HJumrussirikil P, Atiga W, Lardo A, Berger R, Halperin H, Hutchins G, Calkins HPACE 2000; 23:203-213.PACE 2000; 23:203-213.
• 10 dogs• 4 with standard pullback approach• 6 with Cardima microcatheters• 4 linear lesions: intercaval, septal, flutter, & anterior lines• One month to animal sacrifice• Compared lesion size and shape and complications
28CARDIMACARDIMA®®
Linear Atrial Ablation Using the Drag and Burn TechniqueLinear Atrial Ablation Using the Drag and Burn Technique
Jumrussirikil et al; PACE 2000; 23:203-213.
29CARDIMACARDIMA®®
Linear Atrial Ablation Using the Cardima MultielectrodeAblation Catheter
Jumrussirikil et al; PACE 2000; 23:203-213.
30CARDIMACARDIMA®®
0
1
2
3
4
5
6
MICRO STND
Wid
th o
f L
esio
n(m
m)
2.62.6
4.94.9
Comparison of Lesion Width
p < 0.05
Jumrussirikil et al; PACE 2000; 23:203-213.
CARDIMACARDIMA®®
29.4
21
0
10
20
30
40
50
60
70
80
Length (mm)
CardimaStnd RF
Comparison of Lesion Length
p = 0.NS
Jumrussirikil et al; PACE 2000; 23:203-213.
32CARDIMACARDIMA®®
0
0.5
1
1.5
2
2.5
3
3.5
4
4.5
5
MICRO STND
Dep
th o
f L
esio
n(m
m)
2.42.4
Comparison of Lesion Depth
2.12.1
Jumrussirikil et al; PACE 2000; 23:203-213.
33CARDIMACARDIMA®®
Multipolar Microcatheter Pullback Approach
25 in 25 lesions (100%) 6 in 16 lesions (37%)
Comparison of Lesions Linearity
p < 0.05
Jumrussirikil et al; PACE 2000; 23:203-213.
34CARDIMACARDIMA®®
Continuous 18/25 (72%)
Continuous 6/16(37%)
Comparison of Lesion Continuity
Multipolar Microcatheter Pullback Approach
p < 0.05Jumrussirikil et al; PACE 2000; 23:203-213.
35CARDIMACARDIMA®®
Anchor10/16 (62%)
Multipolar Microcatheter Pullback Approach
Comparison of Lesion Anchoring to an Anatomic Structure
Anchor 23/25 (92%)
p < 0.05
Jumrussirikil et al; PACE 2000; 23:203-213.
36CARDIMACARDIMA®®
ConclusionsConclusions
1) Atrial lesions created using MICRO1) Atrial lesions created using MICRO
are narrower, more continuous, more are narrower, more continuous, more
linear, and more likely to be anchored to an linear, and more likely to be anchored to an
anatomic structure than those created with anatomic structure than those created with
STND. STND.
2) These differences in lesions characteristics may 2) These differences in lesions characteristics may
facilitate cure of atrial fibrillation with a catheter facilitate cure of atrial fibrillation with a catheter
based MAZE procedure.based MAZE procedure.
Jumrussirikil et al; PACE 2000; 23:203-213.
37CARDIMACARDIMA®®
Rationale for a Right Atrial ProcedureRationale for a Right Atrial Procedure
Very likely lower risk than left atrial ablation
May be more widely applicable
With lower risks, physicians are likely to offer a right atrial ablation procedure to highly symptomatic patients
38CARDIMACARDIMA®®
Protocol Development and Study DesignProtocol Development and Study Design
Hugh Calkins, M.D.Professor of Medicine
Director of ElectrophysiologyThe Johns Hopkins Medical Center
Baltimore, MD
40CARDIMACARDIMA®®
Protocol Development ChronologyProtocol Development Chronology1996 Initial Study Design Collaboration with MGH, FDA, CARDIMA®
1997 Phase Ia Mapping Study (PATHFINDER™ AF)
1998 Phase IIa Mapping and Ablation (REVELATION® Tx)
1998 Circulatory Systems Recommendations for Clinical Trial DesignAdvisory Panel for AF Studies
19981998 Phase IIbPhase IIb Mapping and Ablation Mapping and Ablation (REVELATION(REVELATION®® Tx) Tx)
2000 Circulatory Systems Recommendations for Clinical Trial DesignAdvisory Panel for AF Studies
2000 Phase IIIPhase III Mapping and AblationMapping and Ablation(REVELATION(REVELATION®® Tx and Tx and
NAVABLATORNAVABLATOR™™))
41CARDIMACARDIMA®®
STUDY PARAMETER PANEL GUIDANCE CARDIMA STUDY
Trial Design Single Arm Non-Randomized
Control group Patient as own control
Patient Population Failed 2 AADs or amiodarone
Baseline AF Two episodes over three months *
FDA Advisory Panel Recommendations
* 3 episodes per month
42CARDIMACARDIMA®®
PARAMETER PANEL GUIDANCE CARDIMA STUDY
Long-Term Success
50-75% reduction in frequency of symptomatic AF episodes
Six months evaluation of therapy effectiveness
Safety Incidence of Major Complications
Quality of Life “Improved quality of life may be a very important outcome.”
FDA Advisory Panel Recommendations (cont’d…)
43CARDIMACARDIMA®®
• Reduction in symptomatic AF episodes
• Safety
• Improvement in quality of life
Study ObjectivesStudy Objectives
44CARDIMACARDIMA®®
Inclusion CriteriaInclusion Criteria
Three or more symptomatic AF episodes per 30 days (documented by cardiac event monitor)
Refractory to two or more (AADs) or to amiodarone alone
Absence of significant structural heart disease, LA size < 5 cm
Absence of echocardiographic evidence of intra-atrial thrombus, PFO, and/or ASD on TEE
45CARDIMACARDIMA®®
Acute ablation failure within 2 monthsAcute ablation failure within 2 months
MI within 6 weeksMI within 6 weeks
CVA or TIA within 6 monthsCVA or TIA within 6 months
PregnancyPregnancy
Coagulopathy or bleeding diathesisCoagulopathy or bleeding diathesis
Exclusion CriteriaExclusion Criteria
46CARDIMACARDIMA®®
Study SchemaStudy Schema
YesYes Screen FailureScreen Failure Excluded From StudyExcluded From Study
Informed ConsentInformed Consent
30-Day Baseline Monitoring30-Day Baseline Monitoring
3 or more Symptomatic episodes?3 or more Symptomatic episodes?
YesYes
TEETEEThrombus?Thrombus?
NoNo
RF AblationRF Ablation
Pre-DischargePre-DischargeEvaluationsEvaluations
Follow-Up Evaluations at 1, 3, 6, 12, and 24 monthsFollow-Up Evaluations at 1, 3, 6, 12, and 24 months
47CARDIMACARDIMA®®
AssessmentAssessment Study IntervalStudy Interval
History, Physical Exam, 12-Lead EKG
Baseline, and office visits at 1, 3, 6 and 12 months post ablation
TEE Baseline
Echocardiogram and stress test Baseline and 3 months
Cardiac Event Monitor Weekly and symptomatic transmissions @ baseline, months 1, 3, and month 6
Quality of Life Questionnaires Baseline, Months 3 and 6
Telephone interview 24 months
Patient Follow-upPatient Follow-up
48CARDIMACARDIMA®®
Study EndpointsStudy Endpoints
“Primary clinical endpoints:
Frequency of spontaneous symptomatic AF episodes
Incidence of adverse effects”
“Secondary clinical endpoint:
Quality of life based on the SF-36 and the AFSS”
49CARDIMACARDIMA®®
Success CriteriaSuccess Criteria
Acute Procedural Success:
Reduction in amplitude, fragmentation or widening of local electrograms
Appearance of split potentials
Increase in pacing threshold
50CARDIMACARDIMA®®
Success Criteria, cont’dSuccess Criteria, cont’d
Primary Endpoint:
50% reduction in AF episodes for patients with 5 AF episodes per month
75% reduction in AF episodes for patients with 3-4 AF episodes per month
Clinical Success
Reduction in AF episodes as specified above
“While maintained on the same anti-arrhythmic drug regimen or a reduced dosage”
51CARDIMACARDIMA®®
N=80 evaluable subjects at 6 months follow up
Based on estimated patient success rate
Statistical considerations with a clinically acceptable margin of error (SE=0.056)
This sample size was specified in the FDA approved protocol
Sample SizeSample Size
52CARDIMACARDIMA®®
Multiple animal studies have demonstrated safe creation of thin , transmural, linear ablation lesions
Clinical study was designed in collaboration with the FDA
Clinical study incorporates a large number of measures of safety and efficacy
As the first AF clinical trial this study is charting new waters
SummarySummary
53CARDIMACARDIMA®®
Patient Population and Study ResultsPatient Population and Study Results
Abraham G. Kocheril, M.D.Head of Cardiac Electrophysiology,
Carle Heart Center.Associate Professor of Medicine,
University of Illinois COM at U-C,Urbana, IL
54CARDIMACARDIMA®®
INVESTIGATOR CLINICAL INVESTIGATIONAL SITE
Ruey Sung, M.D. Stanford University Medical Center, Stanford, CAJeremy Ruskin, M.D. Massachusetts General Hospital, Boston, MAHugh Calkins, M.D. The Johns Hopkins Medical Center, Baltimore, MDDouglas Packer, M.D. Mayo Clinic, Rochester, MNTed Friehling, M.D. Inova Inst. of Research & Education, Falls Church, VARoger Marinchak, M.D./ Main Line Health Heart Center, Wynnewood, PADavid Wilber, M.D. University of Chicago, Chicago, ILBruce Hook, M.D. Catholic Medical Center, Manchester, NHSeth Worley, M.D. Lancaster Heart Foundation, Lancaster, PATimothy Talbert, M.D. Diagnostic Center, Chattanooga, TNSanjeev Saksena, M.D. Cardiac Medicine & Electrophysiology, Warren, NJAbraham Kocheril, M.D. Carle Heart Center, Urbana, ILLarry Chinitz, M.D. NYU Medical Center, New York, NYImran Niazi, M.D. Wisconsin Center for Clinical Research, Milwaukee, WIJose Nazari, M.D. Cardiac Arrhythmia Consultants, Ltd., Chicago, ILRandy Lieberman, M.D. Harper University Hospital, Detroit, MIRoger Winkle, MD Sequoia Hospital, Redwood City, CAEli Gang, M.D. Access Clinical Trials, Beverly Hills, CABruce Lerman, M.D. Cornell University Medical Center, New York, NYArjun Sharma, M.D. Regional Cardiology Associates, Sacramento, CA
20 Clinical Sites20 Clinical Sites
55CARDIMACARDIMA®®
Patient AccountabilityPatient Accountability
Ablatedn=120
Withdrew <6 months, n=8
6 Months Post Ablation
n=87
<6 Months Post Ablation
n=18
Withdrew >6 monthsn=7
56CARDIMACARDIMA®®
Effectiveness CohortsEffectiveness Cohorts
Baseline data 6 months follow-Baseline data 6 months follow-upup
n= 87n= 87
Evaluable for Evaluable for 11oo effectiveness endpoint effectiveness endpoint
n=81n=81
Indeterminate 6-month Indeterminate 6-month episode dataepisode data
n=1n=1
Indeterminate Indeterminate baseline episode baseline episode
datadatan=5n=5
57CARDIMACARDIMA®®
Reason for Withdrawal (n=8) # pts
Unable/Unwilling to do follow-up 4
AVN ablation and/or PPM implantation 4*
Patients Withdrawn Prior to Six Months (n=8)Patients Withdrawn Prior to Six Months (n=8)
* one patient included in effectiveness analysis
58CARDIMACARDIMA®®
Demographic and Baseline CharacteristicsDemographic and Baseline Characteristics
CharacteristicCharacteristic Freq. (%)Freq. (%)
Age, mean ± SD, years 56.9 ± 10.9
Male Gender 89 (77)
Cardiovascular Disease 84 (72)
Other Medical Conditions
Respiratory 30 (26)
Endocrine 30 (26)
Neurologic 22 (19)
Renal 21 (18)
59CARDIMACARDIMA®®
Prior Cardiac InterventionsPrior Cardiac Interventions
Type of InterventionType of Intervention Freq. (%)Freq. (%)
RF Ablation 33 (28)CABG 9 (8)DC Cardioversion 8 (7)
Pacemaker 7 (6)PTCA/Stent 5 (4)Angioplasty 2 (2)
60CARDIMACARDIMA®®
Breakdown of AblationsBreakdown of Ablations
(for 87 subjects with 6 mo FU)(for 87 subjects with 6 mo FU)
Prior RF Ablation ProceduresPrior RF Ablation Procedures Freq. (%)Freq. (%)
Subjects with Prior RFCA 22/87 (25)
Types:
Atrial Flutter 22
SVT/ Atrial Tachycardia 19
61CARDIMACARDIMA®®
Baseline Arrhythmia SymptomsBaseline Arrhythmia Symptoms
Symptoms N (%)
Palpitations 101 (87)
Fatigue 68 (59)
Shortness of Breath 58 (50)
Lightheadedness 43 (37)
Chest Pain 22 (19)
Other 34 (31)
62CARDIMACARDIMA®®
Baseline Symptomatic AFBaseline Symptomatic AFEpisodes Per MonthEpisodes Per Month
Mean, SD = 10.1 ± 8.9
32
45
17
9 85
0
10
20
30
40
50
3-4 5-9 10-14 15-19 20-29 30+
# Symptomatic AF Episodes Per Month
# Pa
tient
s
Panel Recommended
2 Episodesper 3 Months
0.67
63CARDIMACARDIMA®®
SF-36 Mean Scores at BaselineSF-36 Mean Scores at BaselineStudy Group vs. US Population*Study Group vs. US Population*
78.475.1
70.6
81.1
67.5
61.2
82.976.2
72.769.6
37.5
66.3
60.4
44.9
71.374.4
0
10
20
30
40
50
60
70
80
90
100P
hysi
cal
Fu
nct
ion
ing
Role
Ph
ysi
cal
Bo
dil
y P
ain
Role
Em
oti
on
al
Gen
era
l H
ea
lth
Vit
ali
ty
So
cia
l
Fu
nct
ion
ing
Men
tal
Hea
lth
Mean
Sco
re
US Study Group
* Adjusted for the age and gender distribution of the study group
64CARDIMACARDIMA®®
Study ResultsStudy Results
65CARDIMACARDIMA®®
Lesion LocationsLesion Locations
Post-LateralA
IsthmusC
SeptalB
AnteriorD
A – 90.3%B – 93.0%C – 90.3%D – 8.7%ABC – 82.6%
66CARDIMACARDIMA®®
Procedure TimesProcedure Times
Total TimeTotal TimeMean ±Mean ± SD SD (minutes)(minutes)
Procedural Time 250 ± 123
Fluoroscopy Time 47 ± 46
67CARDIMACARDIMA®®
Acute Procedural SuccessAcute Procedural Success
Surrogate for clinical effectiveness
Initial plans to record specific measurements of acute procedural success became unwieldy
Investigator assessment of acute procedural success at the time of the procedure:
110/118 (93%)
68CARDIMACARDIMA®®
Six Month ResultsSix Month Results
Primary Endpoint
50% reduction for pts with 5 sAF episodes per month
75% reduction for pts with 3-4 sAF episodes per month
Results
69/81 (85%) met this endpoint
69CARDIMACARDIMA®®
Per-Subject AF Episode Reduction (n=81)Per-Subject AF Episode Reduction (n=81)
0
10
20
30
40
50
Baseline 6 Months
Num
ber
of E
piso
des
0
10
20
30
40
50
70CARDIMACARDIMA®®
No symptomatic AF episodes at 6 months:
44/81 (54%)
AF Episode ReductionAF Episode Reduction
71CARDIMACARDIMA®®
Mean Episode Frequency Reduction (n=81)Mean Episode Frequency Reduction (n=81)
9.2
3.5
1.2
0
5
10
15
Baseline 3 Months 6 Months
Me
an
Nu
mb
er
of
Ep
iso
de
s
72CARDIMACARDIMA®®
Reduction in Common Arrhythmia SymptomsReduction in Common Arrhythmia Symptoms(Pre- vs. Six Months Post-RFA)(Pre- vs. Six Months Post-RFA)
34.5
20.7
30.5
87.4
49.4
57.5
11.5
16.1
41.4
21.819.5
25.3
0
10
20
30
40
50
60
70
80
90
100
Palpitations Fatigue Shortness ofBreath
Lightheadness Chest Pain Other
Sym
ptom
(%
)
Pre- Post-
73CARDIMACARDIMA®®
Secondary EndpointSecondary Endpoint
Improvement in Quality of Life Scores
Atrial Fibrillation Severity Score (AFSS) SF-36
74CARDIMACARDIMA®®
AFSSAFSS(Pre- vs. Six Months Post-RFA)(Pre- vs. Six Months Post-RFA)
39.6
49.5
40.1
30.2
68.6**
56.4**52.4*
50.4**
0
10
20
30
40
50
60
70
80
Episode Frequency Episode Duration Episode Severity Total AFSS Score
Mea
n S
core
(±S
E)
Pre- Post-
* p<0.0, ** p<0.0001, paired t-test
75CARDIMACARDIMA®®
SF-36 Mean ScoresSF-36 Mean ScoresBaseline vs. 6 MonthsBaseline vs. 6 Months
72.769.6 66.3
60.4
71.374.4
44.937.5
80.1b
59.6a
76.6c
61.8
76.982.8a
56.3a
75.8c
0
10
20
30
40
50
60
70
80
90
100
PhysicalFunctioning
Role Physical Bodily Pain RoleEmotional
GeneralHealth
Vitality SocialFunctioning
Mental Health
Mea
n Sc
ore
( ± S
E)
Baseline 6 Months
a p<0.0001, b p<0.01, c p<0.05, paired t-test
76CARDIMACARDIMA®®
Major Complications*Major Complications*
An adverse event that occurs within 7 days following investigational procedure and:
Is life-threatening;
Results in permanent impairment or damage to a body structure;
Requires significant intervention to prevent permanent impairment
Requires hospitalization or an extended hospital stay;
Results in moderate transient impairment or damage to a body structure;
Requires intervention such as medication or cardioversion to prevent permanent impairment or damage to a body structure
*FDA definition of acute major complications for catheter ablation studies
77CARDIMACARDIMA®®
Major Complications
4 /123 (3.3%)
Not major complication:1 pacemaker within 7d, but with documented preexisting sinus node dysfunction. Patients with pacemakers addressed later.
Pericardial effusion requiring pericardial window one week post ablation
Sinus node injury requiring pacemaker implantation
Stroke 4 days post ablation
AV Fistula
78CARDIMACARDIMA®®
Adverse Events during Follow-upAdverse Events during Follow-up
31/120 patients (27%)31/120 patients (27%)
Adverse Event n
AVN Ablation/Permanent Pacemaker 6
Cardioversion 2
Infection (URI, UTI) 2
Sinus Node Dysfunction 1
Stroke (>1yr FU) 1
Other 41
Total 53
79CARDIMACARDIMA®®
Other Adverse EventsOther Adverse Events
Symptom Total Symptom Total
Skin Burns/Irritation 6Back Pain & Nausea
1
Sore Throat 4 Dehydration 1
Back Pain 2 Discomfort 1
Bleeding (at incision)2
Groin Pain 1
Hematoma2 Increased
Palpitations1
Hospitalization (INR/Ataxia)
2Pauses Asystolic 1
Increased Weakness2
Phlebitis 1
Pericarditis2
Pulmonary Hypertension (post PPM)
1
Shortness Of Breath & Chronic Fatigue
2 Swelling (right hand)
1
Supraventricular Tachycardia
2Asthma 1
Thigh Numbness2 Upper Respiratory
Infection1
Atrial Flutter1 Urinary Tract
Infection1
80CARDIMACARDIMA®®
Adverse Events during Follow-upAdverse Events during Follow-up
SummarySummary
No reports of:
Mortality
Cardiac Perforation
AV Fistula or arterial injury
Thromboembolism
73% reported no adverse events
81CARDIMACARDIMA®®
STUDY ENDPOINT DEFINITION # PTs (%)
Effectiveness
Primary Endpoint ≥ 50/75% Reduction in Frequency of sAF episodes at 6 Months
69/81 (85)
Clinical Success Reduction in sAF episodes While Maintained on Same AAD Regimen or Reduced Dosage
50/81 (62)
Quality of Life
Secondary Endpoint
1) SF-36 2) AFSS Statistically Significant QOL Improvements
Safety
Major Complications
Serious Adverse Events ≤7 Days Post Procedure
4/120 (3.3)
Summary ResultsSummary Results
82CARDIMACARDIMA®®
Issues for ClarificationIssues for Clarification
Catheters/Lesion Sets
Pacemakers
Clinical Success & Antiarrhythmic Drugs
TTM Compliance
83CARDIMACARDIMA®®
Lesion SetsLesion Sets
Post-LateralA
IsthmusC
SeptalB
AnteriorD
A – 90.3%B – 93.0%C – 90.3%D – 8.7%ABC – 82.6%
84CARDIMACARDIMA®®
Catheters/Lesion Sets
REVELATION® Tx used for all non-isthmus linear lesions
REVELATION® Tx linear catheter could ablate some but not all flutter isthmus.
Thus, investigators used clinically available 4 mm tip ablation catheters to create the flutter line
NavAblator catheter developed for Phase III
Some investigators preferred use of their standard 4 mm catheters
85CARDIMACARDIMA®®
Phase III FDA required that a conventional 4mm tip ablation catheter be specified.
Cardima manufactured the NAVABLATOR™ to be specified as part of the “system”, solely for the creation of the “flutter line” at the isthmus when the anatomy was not compatible with the REVELATION® Tx linear electrode array.
Catheters/Lesion Sets
86CARDIMACARDIMA®®
PacemakersPacemakers
Per protocol: “Subjects electing to receive implantable ppms prior to 6 mo f/u will be considered failures.”
• Intent: subjects should not require adjunctive pacemaker therapy to address AF
• Not all pts receiving ppm’s fall into this category
Patients with pacemakers not excluded from study
87CARDIMACARDIMA®®
PacemakersPacemakers
Post Procedure Device ImplantsPost Procedure Device Implants nn
PPMs >6 monthsPPMs >6 months 77
PPMs < 6 monthsPPMs < 6 months 1313
PPM for pre-existing SSS or bradyPPM for pre-existing SSS or brady 66
ICD for Sinus Node injury at Tx (not WD)ICD for Sinus Node injury at Tx (not WD) 11
DDDR for AV block & NSVTDDDR for AV block & NSVT 11
AVN/PPM <6 moAVN/PPM <6 mo 55
Flutter ablation + AVN/PPM (no sAF Flutter ablation + AVN/PPM (no sAF reported prior to Txreported prior to Tx
1 1
Insurance coverage changed, new Dr. Insurance coverage changed, new Dr. recommended AVN/PPMrecommended AVN/PPM
11
Treatment failures (n=3)Treatment failures (n=3) 33
Total Post Procedure Device ImplantsTotal Post Procedure Device Implants 2020
88CARDIMACARDIMA®®
Pacemakers Pacemakers
3 Pacemakers shortly after procedure
All 3 had known preexisting sinus node dysfunction
Pt.1: HR 49 when in SR – no AVN ablation
Pt.2: sinus pauses, 34 episodes to 1 at 6 mo – no AVN ablation
Pt.3: sinus brady, 3 sec pauses, 6 to 1 – no AVN ablation
Not major complications
89CARDIMACARDIMA®®
Percentage Of Patients Who Achieved Six Month Percentage Of Patients Who Achieved Six Month
Success Including “Failures" Success Including “Failures"
Subject GroupsSuccess (sAF )
n % - 3 failures, - 5 patients with
indeterminate baseline episodes69/81 85.2
+ 3 failures, + 5 with indeterminate baseline episodes
73/89 82.0
90CARDIMACARDIMA®®
Clinical Success & Antiarrhythmic Drugs
Primary endpoint was reduction in AF frequency independent of AAD use (69/81, 85%)
Study population was drug refractory (avg. 3) and had concomitant medical conditions
“Clinical Success” defined per protocol: Reduction in sAF episodes while maintained on the same anti-arrhythmic drug regimen or a reduced dosage
As determined by clinical site, 19 of the 69 successful patients had an “increase” in AADs
Thus, the “clinical success rate” is 50/81 (62%)
Given current information on the efficacy of AADs, it is difficult to determine a true increase in an AAD regimen
91CARDIMACARDIMA®®
Clinical Success & Antiarrhythmic Drugs
Evaluable for 1o effectiveness endpoint
n=81
< Req’d reduction in AF episodes
n=12 (14.8%)
≥ 50/75% reduction in AF episodes
n=69 (85.2%)
Decrease or No Change in AAD
n= 50
Increase in AADn=19
AVN ablationn= 2
AVN ablationn= 2
92CARDIMACARDIMA®®
Changes in AADs from BL to 6 Months (n=87)Changes in AADs from BL to 6 Months (n=87)
Amiodarone
Membrane Active Drug
Rate Control Drug
12 (10, 1, 1*)
Baseline 6 Months
21 19(17, 1, 1*)
52 47(37, 10)
21(19, 2)
14
5
*(Success/Failure)1 patient with unknown # sAF at 6 months
4
739
3
11 (9, 2*)
(31, 8)(3, 2)
(7, 0)
(3, 0)
(4, 0)
(6, 0)
6
93CARDIMACARDIMA®®
Changes AADs from BL to 6 Months for 23 “Increases* Changes AADs from BL to 6 Months for 23 “Increases*
Amiodarone
Membrane Active Drug
Rate Control Drug
4
Baseline 6 Months
4 6
15 15
24
212
3
1
1
* 2/23 had indeterminate baseline episode frequencies.** 21/23 patients were considered successes.
94CARDIMACARDIMA®®
Clinical Success & Antiarrhythmic Drugs
Patients with Increased AADs (n=21)Patients with Increased AADs (n=21)
19 had reduction in AF episodes (success)
10/19 show a 100% reduction in sAF episodes at 6 months with “increases” to an AAD regimen to which they were previously refractory
The remaining 9/19 had > 50% reduction in episodes
95CARDIMACARDIMA®®
Clinical Success & Antiarrhythmic Drugs
Patient Success by AAD Use at Six MonthsPatient Success by AAD Use at Six Months
0
10
20
30
40
50
60
70
80
90
100
Decrease (n = 36) No Change (n = 24) Increase (n = 21)
Baseline to Six Month AAD Use
Per
cent
Suc
cess
96CARDIMACARDIMA®®
* Sotalol or beta-blockers are the initial drugs of choice for adrenergic AFIB.+ Consider nonpharmacologic options to maintain sinus rhythm if drug failure occurs.HF= heart failureCAD= coronary artery diseaseLVH= left ventricular hypertrophy
Treatment Algorithm for AFTreatment Algorithm for AFHeart disease?
No (or minimal*)
FlecainidePropafenone
Sotalol
Amiodarone, Dofetilide
DisopyramideProcainamide
Quinidine
Considernonpharmacologic
options
Yes+
HF
AmiodaroneDofetilide
Sotalol
AmiodaroneDofetilide
DisopyramideProcainamide
Quinidine
CAD Hypertention
LVH greater thanor equal to 1.4 cm
Yes No
Amiodarone FlecainidePropafenone
AmiodaroneDofetilide
Sotalol
Disopyramide, Procainamide, Quinidine
97CARDIMACARDIMA®®
Patients with Decrease/No Change in AADsPatients with Decrease/No Change in AADs
(n=60)(n=60)
36 patients had decrease in AADs at six months
6 patients were off AADs at 6 months
28 patients had no change in AADs
98CARDIMACARDIMA®®
Transtelephonic Event MonitoringTranstelephonic Event Monitoring
Three Three redundantredundant mechanisms for symptomatic episode mechanisms for symptomatic episode monitoringmonitoring::
TTM (to capture both spontaneous and scheduled transmissions)TTM (to capture both spontaneous and scheduled transmissions)
Arrhythmic events reports (CRFs)Arrhythmic events reports (CRFs)
CClinical history at baseline, 1, 3, 6, and 12 months to to document reports of AF frequency and severitydocument reports of AF frequency and severity
EKG at baseline, 1, 3, and 6 monthsEKG at baseline, 1, 3, and 6 months
AFSS questionnaireAFSS questionnaire
Additional documentation of AF frequency and severityAdditional documentation of AF frequency and severity
99CARDIMACARDIMA®®
Record and transmit each symptomatic episode
Transmit at least weekly (with or without symptoms)
Perform as above at baseline & 1, 3 and 6 months post ablation
Transtelephonic Event MonitoringTranstelephonic Event Monitoring
100CARDIMACARDIMA®®
Transtelephonic Event MonitoringTranstelephonic Event Monitoring
Patients were blinded to number of AF episodes required for study eligibility
TTMs reviewed by independent cardiologist to verify sufficient AF episodes for study eligibility
101CARDIMACARDIMA®®
Transtelephonic Event MonitoringTranstelephonic Event Monitoring
DescriptionBaseline (n=86) 6 Months (n=65*)
Mean, SDRang
eMean, SD Range
# Transmissions per Month 15.5 ± 11.4 5-53 3.9 ± 2.4 1-11
% Symptomatic AF Episodes per Transmission
57.4 ± 24.4 0-100 29.5 ± 35.6
0-100
# Symptomatic AF Episodes per Month
9.0 ± 8.9 0-50 1.3 ± 2.1 0-11
•22 subjects did not transmit recordings at six months.
•All had EKG/Office Visit at 6 month FU
* One subject not included
102CARDIMACARDIMA®®
3.9
15.5
0
2
4
6
8
10
12
14
16
18
Baseline 6 Months
Tra
nsm
issi
ons/
Mon
th
All Transmissions
% Symptomatic AF Episodes /Transmission
57.4%
29.5%
Transtelephonic Event MonitoringTranstelephonic Event Monitoring
103CARDIMACARDIMA®®
AssessmentAssessment # Pts # Pts
Completed Completed (n=81)(n=81)
Arrhythmia SymptomsArrhythmia Symptoms 80 (99%)80 (99%)
EKGEKG 80 (99%)80 (99%)
AFSS QuestionnaireAFSS Questionnaire 74 (91%) 74 (91%)
Transtelephonic Event MonitoringTranstelephonic Event Monitoring
Patient Compliance with 6-Month Assessments Patient Compliance with 6-Month Assessments of Arrhythmic Eventsof Arrhythmic Events
104CARDIMACARDIMA®®
AFSS Mean Scores at Six MonthsAFSS Mean Scores at Six Monthsby Six-Month Transmission Complianceby Six-Month Transmission Compliance
51.2 50.7
69.8
57.4
52.6
64.6
55.6
47.9
0
10
20
30
40
50
60
70
80
Episode Frequency Episode Duration Episode Severity AFSS Total
AF
SS
Me
an
Sco
re
Did Transmit
Did Not Transmit
105CARDIMACARDIMA®®
Issues for ClarificationIssues for Clarification
Although this study design, while consistent with the recommendations of the FDA Advisory Panel, has some inherent limitations compared to a controlled, randomized study (CRT), Cardima believes it is unlikely that the patient improvements seen in these study results could be attributable individually or collectively to the effects of these limitations
106CARDIMACARDIMA®®
Study Summary Study Summary
Effectiveness
Reduction in AF episodes at 6 mo 69/81 (85%)
No AF at 6 months 44/81 (54%)
Clinical success 50/81 (62%)
Off all AADs 6/81 (7 %)
Reduction in AADs 36/81 (44%)
Quality of Life Significant improvements
Safety
Mortality 0/120 (0%)
Major Complications 4/120 (3%)
107CARDIMACARDIMA®®
Closing RemarksClosing Remarks
G. Neal Kay, M.D.Professor of Medicine
Director of ElectrophysiologyUniversity of Alabama at Birmingham
Birmingham, AL
108CARDIMACARDIMA®®
ConclusionConclusion
The REVELATION Tx linear ablation system is safe and effective in treatment of patients with paroxysmal atrial fibrillation in the absence of significant structural heart disease.
109CARDIMACARDIMA®®
Study StrengthsStudy Strengths
Robust Study Design - Patients acted as their own control
Study consistent with FDA Advisory Panel recommendations
Use of TTM provided an objective measure of therapy success
Use of subjective measures of therapy effectiveness (i.e., QOL) captured important patient parameters
Study demonstrated excellent safety profile
Study demonstrated clinically meaningful improvement in patient outcomes
110CARDIMACARDIMA®®
Summary of Study ResultsSummary of Study Results
This is the first multicenter clinical trial of catheter ablation for atrial fibrillation to be completed
Right atrial linear ablation offers a level of success for control of paroxysmal atrial fibrillation
Most patients continued on AADs at the same or lower dose
AF did not appear to worsen in most PAF pts, as is the natural history of the disease
This level of success was accomplished with a very low risk of serious complications
111CARDIMACARDIMA®®
The Atrial Fibrillation ChallengeThe Atrial Fibrillation Challenge
PV isolation is effective in about 2/3 of patients with paroxysmal AF
The risks are significant and include:
• PV stenosis - 1-8% and is related to experience
• Stroke – 1-4%
• Tamponade - 1-4%
• Major bleeding - 2-3%
Limited to physicians competent to perform transeptal catheterization
There have been no multicenter prospective trials of PVI
112CARDIMACARDIMA®®
Risk : BenefitRisk : Benefit
The lower risks of this relatively simple procedure are likely to allow it to be performed by a wider range of physicians than a complex left atrial ablation procedure
It is likely that a simple right atrial ablation procedure will be offered to patients with highly symptomatic paroxysmal atrial fibrillation before more risky techniques
113CARDIMACARDIMA®®
Conclusions Conclusions
REVELATION® Tx is a new RF catheter ablation technology specifically designed to create linear lesions in the right atrium
Provides an important treatment option for many patients with drug refractory paroxysmal AF
Addresses currently unmet public health need for safe and effective treatment of AF, a disease of great clinical significance to the medical community, both in terms of patient suffering and high medical costs of treating AF and its clinical sequelae
This technology has been demonstrated to eliminate > 50% of symptomatic AF episodes in treated patients
114CARDIMACARDIMA®®
REVELATIONREVELATION®® Tx Tx