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Electrocardiogram

Electrocardiogram

An electrocardiogram (ECG or EKG) is a critical diagnostic tool that records the electrical signals produced by the heart during each heartbeat. This recording is achieved through electrodes placed strategically on the arms, legs, and chest. The electrocardiograph amplifies these signals and produces 12 distinct tracings, offering a comprehensive understanding of the heart's electrical activity.
Three major waveforms are present in a typical ECG recording: the P wave, the QRS complex, and...

Electrocardiogram Fundamentals

Electrocardiogram Fundamentals

Introduction
An electrocardiogram (ECG) is a diagnostic tool for identifying cardiac conditions such as arrhythmias, conduction abnormalities, and myocardial ischemia.
Definition
An electrocardiogram (ECG) visualizes the heart's electrical activity by tracing the electrical movement associated with each heartbeat on a graph or monitor. As the heart beats, an electrical wave passes through it, correlating with the cardiac cycle events.
Parts of an ECG
An ECG utilizes electrodes on the skin...

Cardiac Action Potential

Cardiac Action Potential

Cardiac action potentials are essential for proper heart function, enabling the rhythmic contractions needed for adequate blood circulation. Nodal cells and Purkinje fibers, specialized for electrical conduction, generate these action potentials.
The cardiac action potential process involves a series of phases characterized by the movement of ions across the cardiac cell membranes, leading to the depolarization and repolarization of the cardiac myocytes.
Ionic Basis of Cardiac Action Potentials

Correlation between ECG and Cardiac Cycle

Correlation between ECG and Cardiac Cycle

The electrical signals recorded on an electrocardiogram (ECG) occur before the mechanical processes of contraction and relaxation during the cardiac cycle.
A cardiac action potential originates in the SA node and spreads throughout the atria and the AV node in approximately 0.03 seconds. This results in the P wave in an ECG and triggers atrial contraction. The action potential is then briefly slowed at the AV node, allowing the atria to contract and fill the ventricles with blood before...

Electrophysiology of Normal Cardiac Rhythm

Electrophysiology of Normal Cardiac Rhythm

The normal cardiac rhythm is a synchronized electrical activity that facilitates the regular and coordinated contraction of the heart muscle. This process is essential for efficient blood circulation throughout the body. The fundamental elements involved in establishing and maintaining this rhythm include the unique electrical properties of cardiac muscle cells, the sinoatrial (SA) node's pacemaker function, the specialized conducting system, and the ionic mechanisms underlying each phase...

ECG Interpretation of Arrhythmias II: Atrial, Junctional and Ventricular Arrhythmias

ECG Interpretation of Arrhythmias II: Atrial, Junctional and Ventricular Arrhythmias

Arrhythmia is a condition characterized by an irregular heart rhythm, with ECG changes that differ based on its origin and nature. The types of arrhythmias discussed below include atrial, junctional, and ventricular arrhythmias.Atrial ArrhythmiasPremature Atrial Complexes (PACs): PACs are early atrial beats caused by stress, caffeine, alcohol, electrolyte imbalances, hypoxia, hyperthyroidism, or certain medications (e.g., bronchodilators and decongestants). The ECG shows early P waves with an...

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Isolated deep T-wave inversion on an electrocardiogram with normal wall motion.

Yoshihiro Aoki¹, Satoshi Kodera¹, Sandeep Shakya¹

¹Department of Cardiology, Asahi General Hospital Chiba, Japan.

Clinical Case Reports

|August 15, 2015

Summary

Isolated deep T-wave inversion on an electrocardiogram (ECG) may indicate prior takotsubo cardiomyopathy. This finding in asymptomatic individuals may not require invasive investigation.

Keywords:

Cardiology deep T-wave inversion takotsubo cardiomyopathy

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Area of Science:

Cardiology
Clinical Electrocardiography

Background:

Deep T-wave inversion on an electrocardiogram (ECG) can be an incidental finding.
The clinical significance of isolated deep T-wave inversion in asymptomatic individuals is not fully understood.

Observation:

A 73-year-old asymptomatic woman presented with deep T-wave inversion on her ECG.
Initial comprehensive workup yielded negative results for cardiac abnormalities.
Ten years later, she was diagnosed with takotsubo cardiomyopathy, accompanied by ECG abnormalities.

Findings:

The case suggests that isolated deep T-wave inversion might represent a sequela of takotsubo cardiomyopathy.
This ECG pattern may persist long after the acute phase of the condition.

Implications:

Deep T-wave inversion as an isolated finding in asymptomatic patients may not necessitate aggressive diagnostic procedures.
It could serve as a potential indicator for a history of takotsubo cardiomyopathy, guiding clinical suspicion.
Further research is warranted to validate this association and refine diagnostic algorithms.