Simulating Initiation and Termination of Reentry in Cardiac Tissue Ena Xiao Mentor: David M. Chan.
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Transcript of Simulating Initiation and Termination of Reentry in Cardiac Tissue Ena Xiao Mentor: David M. Chan.
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Simulating Initiation and Termination of Reentry in Cardiac
TissueEna XiaoMentor: David M. Chan
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GOAL
• To understand the dynamic of a ring of excitable media that can be a cause of cardiac arrhythmia.
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Background• Arrhythmias - abnormal heart rhythms
– Bradycardia - less than 60 beats per min.– Tachycardia - pace of the heart is faster
than the regulatory signal from the sinus node (over 100 beats per min).• Rapid heart beating in the ventricles can be
life-threatening. (ex. Ventricular fibrillation - heart can’t pump any blood)
Currently, over 2.2 million Americans are living with atrial fibrillation. (Estimated by American Heart Association)
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Heart Diagram
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Glossary
• Reentry: unidirectional recirculation of AP.• UDC: unidirectional circulation• Diastolic Interval (DI): recovering time
between AP.• Conduction Time (CT): the time required for
an AP wave front to travel a specified distance.
• Action Potential Duration (APD): defined with respect to a threshold voltage.
• T1 / T2 / T3 / T4: Threshold
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Ring-like Cardiac Tissue
• A schematic representation of a ring of cardiac tissue.
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Adjacent cells’ Voltage
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Restitution Curve
(a) APD Restitution Curve (B) CT Restitution Curve
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Thresholds
In order to initiate and maintain reentry, the
following thresholds must be satisfied.
– Each cell requires a minimum DI for recovery of
excitability.
– The reentrant action potential must propagate
around the ring slow enough for cell one to recover
excitability
– The reentrant action potential must propagate
around the ring fast enough to excite cell one
before the SA node
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What I have done.
• Generating data from the model with different parameters, and looking at patterns.
• Studying different conditions that may cause lethal arrhythmia.
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UDC vs. Reentry
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Thank You!
Dr. David Chan, Mentor
Dr. Allison Johnson, Coordinator of HHMI Summer Scholar Program
Hailan Liu