Related Experiment Video
Updated: Mar 27, 2026
High-Throughput Analysis of Optical Mapping Data Using ElectroMap
Published on: June 4, 2019
Real-time feedback based control of cardiac restitution using optical mapping
Insights
This study introduces a novel optical mapping system to control cardiac restitution, aiming to prevent fatal heart rhythms by maintaining a shallow restitution slope. This new method offers improved spatial resolution for anti-arrhythmic therapies.
Area of Science:
- Cardiology
- Biophysics
- Computational Biology
Background:
- Cardiac restitution describes the action potential duration's shortening with increased heart rate.
- Steep cardiac restitution can cause unstable electrical activity (alternans) and fatal arrhythmias.
- Previous methods for controlling cardiac restitution had limited spatial resolution.
Purpose of the Study:
- To develop a real-time feedback control system for cardiac restitution using optical mapping.
- To enable detection of action potential durations (APDs) from individual pixels.
- To provide a new method for validating the anti-arrhythmic effects of shallow cardiac restitution slopes.
Main Methods:
- Developed a real-time feedback control system utilizing optical mapping.
- Detected APDs from individual pixels in ex-vivo rabbit heart preparations.
- Applied stimuli after a fixed diastolic interval (DI) post-APD detection.
Main Results:
- Successfully implemented an optical mapping-based approach for cardiac restitution control.
- Demonstrated the system's ability to manage APD and DI dynamically.
- Validated the algorithm using optical mapping movies from an ex-vivo rabbit heart.
Conclusions:
- The developed system offers high spatial resolution for controlling cardiac restitution.
- This approach provides a potential method to test and validate anti-arrhythmic strategies.
- Optical mapping-based feedback control is a promising tool in cardiac electrophysiology research.
Abstract:
Cardiac restitution is the shortening of the action potential duration with an increase in the heart rate. A shorter action potential duration enables a longer diastolic interval which ensures that the heart gets adequate time to refill with blood. At higher rates however, restitution becomes steep and thus, can lead to unstable electrical activity (alternans) in the heart, leading to fatal cardiac rhythms. It has been proposed that maintaining a shallow slope of cardiac restitution could have potentially anti-arrhythmic effects. Previous studies involved the control of action potential duration (APD) or diastolic interval (DI) in isolated tissue samples based on the feedback from single microelectrode recordings. This limited the spatial resolution of the feedback system. Here, we aimed to develop a real time feedback control system that enabled the detection of APDs from various single pixels based on optical mapping recordings. Stimuli were applied after a predefined fixed DI after detection of an APD. We validated our algorithm using optical mapping movies from an ex-vivo rabbit heart. Thus, we provide an optical mapping based approach for the control of cardiac restitution and a potential means to validate its anti-arrhythmic effects.
