don’t miss a beat: arrhythmia detection for preclinical ecg research
TRANSCRIPT
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Don’t Miss a Beat: Arrhythmia Detection for Preclinical ECG Research
Henry Holzgrefe
Safety Pharmacology Consultant,
Charles River Laboratories,
Preclinical Research, Nevada
Belal A. Mohamed, MD
Clinic of Cardiology and Pneumology,Georg-August-University, Goettingen, Germany
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InsideScientific is an online educational environment designed for life science researchers. Our goal is to aid in the sharing and
distribution of scientific information regarding innovative technologies, protocols, research tools and laboratory services.
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Better Data. Better Science.
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Arrhythmias Score Correlates with the Stage of Myocardial Remodeling: a murine study using Data Insights
Belal A. Mohamed, MD
Clinic of Cardiology and Pneumology,Georg-August-University,
Goettingen, Germany
Copyright 2016 Belal Awd, Data Sciences Int’l & InsideScientific. All Rights Reserved.
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TransaorticConstriction-induced Cardiac Remodeling
Takimoto E. et al., Nat med, 2005
• A suture is placed around the transverse aorta
• In acute stage: compensatory hypertrophy (CH)
• In chronic stage: heart failure (HF)
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Chamber Dilation and Deteriorated Pump Function
• Increased left ventricle end-diastolic dimension (LVEDD)
• Decreased ejection fraction (EF)
TAC
2 wk (CH)
Serial Echo every week
9 wk (HF)
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MorphometricMeasurement
• Increased Heart weight/Tibia length
• Increased Lung weight/ Tibia length (lung congestion)
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Histological and Molecular Analyses
• Increased CSA of cardiomyocytes
• Increased Nppb expression (remodeling marker)
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• Kaplan Maier Curves
Enhanced Mortality post-TAC
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Gorski PA and Przemek A, Cell Metabolism, 2015
Excitation-Contraction Coupling
• Systole, AP opens the LTCC
• Ca2+ entrance• CICR • Ca2+ binds to TN-C• Muscle contraction• Diastole, Ca2+ removal• Decrease cytosolic Ca2+
• Dissociation of Ca2+
from TN-C• Muscle relaxation
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Leak-Induced Arrhythmias
• Ca2+ leak is pumped out via the NCX, which brings Na+ into the cell
• This creates a depolarizing inward current
• Generation of DADs, triggered activity and arrhythmia induction
Wagner S. et al. Circ Res. 2015
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Increased SR Ca2+ Spark Post-TAC
• Confocal scanning microscopy
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Increased SR Ca2+
Spark Post-TAC
• Increased spark frequency and overlallspark-mediated Ca2+ leak
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• Total SR Ca2+ leak includes Ca2+ spark- and non spark- dependent mechanisms
• Measurement of total SR Ca2+ leak according to shannon TR. et al., CircRes 2002
Increased Total SR Ca2+ Leak post-TAC
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Implanted Ambulatory Telemetry in Lead II Configuration
• Anesthetizing the mouse
• Positive lead in the left abdomen
• Negative lead in the right chest
McCauley MD & Wehrens XHT, J Vis Exp, 2010
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Detected Forms of Arrhythmias
Representative ventricular tachyarrhythmiaspost-TAC …
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Ambulatory Telemetry Data
Telemetry
implantationTAC
1 wk 2 wk 7 wk
Arrhythmias
detection
Arrhythmias
detection
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Ambulatory Telemetry Data
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Programmed Electrical Stimulation
• Langendorff-perfused hearts
• Increased ventricular arrhythmias inducibility after TAC
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Summary
• The elevated SR Ca2+ leak in myocardial remodeling increases arrhythmias vulnerability
• SR Ca2+ leak-induced arrhythmias, beside pump failure, are responsible for increased mortality after TAC
• Arrhythmia severity correlates well with the severity of myocardial remodeling in mice…
Moderate remodeling (CH) mostly single PVCsSevere Remodeling (HF) mostly VTs
Translational Outlook
• Inhibition of the SR Ca2+ leak could improve survival in patient with HF by reducing lethal arrhythmias
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Assessment of the Proarrhythmic Effects of Ouabain: experience with Data Insights™
Henry Holzgrefe
Safety Pharmacology Consultant,
Charles River Laboratories,
Preclinical Research, Nevada
Copyright 2016 H. Holzgrefe, Charles River Laboratories, Data Sciences Int’l & InsideScientific. All Rights Reserved.
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DATA INSIGHTS – Prior Validation
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Data From 41 Hand-Scored Snippets
• Parallel analysis
• Cardiologist over read
• Data Insights
• PACs (8 vs. 11) only discrepancy
• 3 species
• Dog
• Cynomolgus
• Minipig
Arrhythmia Cardiologist Data Insights
Ventricular Ectopics 83 83
Junctional Complexes 38 38
AV Block 2nd degree 12 12
Sinus Pause 11 11
Premature Atrial Contraction 11 8
Ventricular Bigeminy 8 8
Ventricular Couplets 6 6
Interpolated Beats 4 4
Ventricular Triplets 1 1
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Predefined Searches
an_ (analysis)
ar_ (arrhythmia)
dv_ (data validation)
Current Arrhythmias
Predefined Searches
– AV Blocks
– Junctional Beats
– Premature Atrial Contractions
– Ventricular Escape Beats
– Ventricular Ectopics ie. Couplets, Triplets, Runs, Bigeminy, Trigeminy
Existing searches may be modified or
new searches created
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Introduction
• Proarrhythmic liability is a major cardiovascular risk
• CiPA will concentrate on in vitro and in silico analysis
• Continuous proarrhythmic analysis of large in vivo datasets will require automated technology
• Data Insights is currently validated with small data snippets
• Characterize in large datasets with time and dose-dependent proarrhythmic effects using known reference agent
Introduction
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Experimental Design
• 5 telemetered beagle dogs: 8-15 kg; 7-15 months
– Isoflurane anesthesia
• Ouabain administration
– 20 µg/kg iv bolus + 1 µg/kg/min continuous infusion– 1 subject received 2x nominal dose
– Terminate at arrhythmia onset• Ectopy (~ 100%) primarily due to DADs related to abnormal Ca2+ homeostasis
• Hamlin, R.L. Pharmacology and Therapeutics, 113 (2007) 276-295
• TK samples through 3 hours postdose
• Present the most complex subject as exemplar
– Subject 1504
Experimental Design
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• Telemetered data digitized at 500 Hz
• Primary ECG and BP analysis with Ponemah ver. 5.2, SP7
• Arrhythmia analysis with Data Insights
• Verify fiduciary ECG marks with Ponemah Pattern Recognition
• Employ prespecified searches to capture atrial and ventricular effects– Categorize PAC, 2°AVB, Junctional, and Ectopic beats
• PK/PD correlations
Methods
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STUDY RESULTS
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Ouabain PK (n=5)
y = 0.4985x + 6.7265R² = 0.6191
0
10
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0 20 40 60 80 100 120 140
ng
/ml
Infused µg/kg
Ouabain Pharmacokinetics (n=5)
• Samples at 0, 15, 30, 60, 90, 120,150 and 180 min
• Where feasible
• Time and dose-dependent exposure in all subjects
• Between subject variability
• Exposures only possible in anesthetized dog via iv administration
• Intractable emesis
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Ouabain – Hemodynamic Effects
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ng/m
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Hg
Hours
Systolic
Diastolic
Ouabain
Subject 1504
Ouabain – Hemodynamic Effects
• Cardiac glycoside
• Inhibits Na+/K+-ATPase
• Increases intracellular Na
• Increases intracellular Ca2+
via NCX
• Positive inotrope
• Dose-dependent increase in systemic pressures
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Systolic
Diastolic
Ouabain
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0
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PR (m
s)
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s)
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PR-I
RR and PR Intervals
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s)
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RR-I
PR-I
Subject 1504
RR and PR Intervals
• Exposure-dependent increase in RR
• Inotropic component
• Exposure-dependent increase in PR
• Exceeds RR effect
• ↑PACs, 2°AVB
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V (m
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s)
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QTcV
QRS and QTcV Interval
QRS and QTcV Intervals
0
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QTcV
Subject 1504
• Time and dose-dependent increase in QRS interval
• ↑Ventricular ectopy
• QTcV shortening
• Consistent with in vitro APD shortening
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Pre
mat
ure
Atr
ial C
on
trac
tio
n Subject 1504
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2°
AV
Blo
ckSubject 1504
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Ventricular Ectopic Beats
Ven
tric
ula
r Ec
top
ic B
eats
Subject 1504
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Ventricular Triplets
Ven
tric
ula
r Tr
iple
tsSubject 1504
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Ventricular Escape Beat
Ven
tric
ula
r Es
cap
e B
eat
Subject 1504
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Ventricular Run
Ven
tric
ula
r R
un
Subject 1504
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Summary and Conclusions
Robust time and dose-dependent arrhythmia detection
Ouabain effects on AV conduction limited investigation of complex variants
Enables PK/PD modeling of arrhythmia incidence
Consistent with pending CiPA objectives
Example of failure of specific ion channel assays to predict in vivo arrhythmias
Cost and time-effective method for rapid semi-automated arrhythmia analysis in early drug development
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For additional information on Data Insights Software and implantable telemetry solutions for physiological monitoring please visit:
http://www.datasci.com
Thank You!
Henry [email protected]
Dr. Belal A. [email protected]