About ECGRef
ECGRef is a focused educational reference for clinicians and learners interpreting electrocardiograms, integrating core electrophysiology concepts, rhythm recognition, and clinically relevant patterns to support accurate...
ECGRef is a focused educational reference for clinicians and learners interpreting electrocardiograms, integrating core electrophysiology concepts, rhythm recognition, and clinically relevant patterns to support accurate bedside ECG analysis. This app is intended for educational and informational purposes only. It is not a substitute for professional medical advice, diagnosis, or treatment. Always seek the guidance of a qualified healthcare provider with any questions you may have regarding a medical condition, and never disregard or delay seeking professional advice because of information provided by this app. About Rishi Kumar, MD, FACC ("RK.MD") I'm an adult cardiothoracic anesthesiologist and cardiovascular ICU intensivist practicing in academic medicine. I'm passionate about teaching with free, open-access medical education. Learn more on my site: https://rk.md
Version History Updated: Bug fixes and codebase optimizations 1.4 May 18 Added: Added and modified over 100 Terms Updated: Adjusted user interface elements for Calculator and References tabs 1.3 May 8 Added: Digoxin effect, Arrhythmogenic Right Ventricular Cardiomyopathy (ARVC), Hypertrophic Cardiomyopathy (HCM), Dextrocardia, and Right Ventricular Outflow Tract (RVOT) Tachycardia, Wellens Syndrome, De Winter's T-Waves, and Sgarbossa Criteria rhythms Added: Pinch-to-zoom functionality for the ECG images Updated: Added a Differentiation section to rhythm information Updated: Bug fixes 1.2 Jan 22 Added: Multifocal Atrial Tachycardia (MAT), Wandering Atrial Pacemaker, Junctional Bradycardia, Accelerated Junctional, Left Bundle Branch Block (LBBB), Right Bundle Branch Block (RBBB), Pericarditis Pattern, Hyperkalemia Pattern, Hypokalemia Pattern, Hypercalcemia Pattern, Hypocalcemia Pattern, Electrical Alternans, Osborn (J) Waves Added: Calculator section with option to favorite items Added: ECG images to most of the rhythms Added: Terms section with general ECG/electrophysiology terms 1.1 Jan 16 1.0 Jan 13
Previous Versions
Here you can find the changelog of ECGRef since it was posted on our website on 2026-01-25 01:29:51.
The latest version is 1.4 and it was updated on 2026-06-11 00:07:07. See below the changes in each version.
ECGRef version 1.4
Updated At: 2026-06-11
Changes: Version History Updated: Bug fixes and codebase optimizations 1.4 May 18 Added: Added and modified over 100 Terms
Updated: Adjusted user interface elements for Calculator and References tabs 1.3 May 8 Added: Digoxin effect, Arrhythmogenic Right Ventricular Cardiomyopathy (ARVC), Hypertrophic Cardiomyopathy (HCM), Dextrocardia, and Right Ventricular Outflow Tract (RVOT) Tachycardia, Wellens Syndrome, De Winter's T-Waves, and Sgarbossa Criteria rhythms
Added: Pinch-to-zoom functionality for the ECG images
Updated: Added a Differentiation section to rhythm information
Updated: Bug fixes 1.2 Jan 22 Added: Multifocal Atrial Tachycardia (MAT), Wandering Atrial Pacemaker, Junctional Bradycardia, Accelerated Junctional, Left Bundle Branch Block (LBBB), Right Bundle Branch Block (RBBB), Pericarditis Pattern, Hyperkalemia Pattern, Hypokalemia Pattern, Hypercalcemia Pattern, Hypocalcemia Pattern, Electrical Alternans, Osborn (J) Waves
Added: Calculator section with option to favorite items
Added: ECG images to most of the rhythms
Added: Terms section with general ECG/electrophysiology terms 1.1 Jan 16 1.0 Jan 13
ECGRef version 1.3
Updated At: 2026-05-08
Changes: Version History Added: Added and modified over 100 Terms
Updated: Adjusted user interface elements for Calculator and References tabs 1.3 59m ago Added: Digoxin effect, Arrhythmogenic Right Ventricular Cardiomyopathy (ARVC), Hypertrophic Cardiomyopathy (HCM), Dextrocardia, and Right Ventricular Outflow Tract (RVOT) Tachycardia, Wellens Syndrome, De Winter's T-Waves, and Sgarbossa Criteria rhythms
Added: Pinch-to-zoom functionality for the ECG images
Updated: Added a Differentiation section to rhythm information
Updated: Bug fixes 1.2 Jan 22 Added: Multifocal Atrial Tachycardia (MAT), Wandering Atrial Pacemaker, Junctional Bradycardia, Accelerated Junctional, Left Bundle Branch Block (LBBB), Right Bundle Branch Block (RBBB), Pericarditis Pattern, Hyperkalemia Pattern, Hypokalemia Pattern, Hypercalcemia Pattern, Hypocalcemia Pattern, Electrical Alternans, Osborn (J) Waves
Added: Calculator section with option to favorite items
Added: ECG images to most of the rhythms
Added: Terms section with general ECG/electrophysiology terms 1.1 Jan 16 1.0 Jan 13
ECGRef version 1.2
Updated At: 2026-01-22
Changes: Added: Digoxin effect, Arrhythmogenic Right Ventricular Cardiomyopathy (ARVC), Hypertrophic Cardiomyopathy (HCM), Dextrocardia, and Right Ventricular Outflow Tract (RVOT) Tachycardia, Wellens Syndrome, De Winter's T-Waves, and Sgarbossa Criteria rhythms
Added: Pinch-to-zoom functionality for the ECG images
Updated: Added a Differentiation section to rhythm information
Updated: Bug fixes
ECGRef version 1.1
Updated At: 1970-01-01
Changes: Added: Multifocal Atrial Tachycardia (MAT), Wandering Atrial Pacemaker, Junctional Bradycardia, Accelerated Junctional, Left Bundle Branch Block (LBBB), Right Bundle Branch Block (RBBB), Pericarditis Pattern, Hyperkalemia Pattern, Hypokalemia Pattern, Hypercalcemia Pattern, Hypocalcemia Pattern, Electrical Alternans, Osborn (J) Waves
Added: Calculator section with option to favorite items
Added: ECG images to most of the rhythms
Added: Terms section with general ECG/electrophysiology terms
Disclaimer
Official App Store Link
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