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Related Concept Videos

Electrocardiogram01:29

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 the T...
Electrocardiogram Fundamentals01:28

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 to...
ECG Interpretation of Arrhythmias II: Atrial, Junctional and Ventricular Arrhythmias01:25

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...
Acute Coronary Syndrome II: Pathophysiology and Clinical Manifestations01:19

Acute Coronary Syndrome II: Pathophysiology and Clinical Manifestations

The pathophysiology of Acute Coronary Syndrome [ACD] involves several key processes:The main underlying cause of ACD is atherosclerosis, a chronic inflammatory disease characterized by the buildup of lipid-laden plaques within the coronary arteries.As the atherosclerotic plaque grows in the coronary artery, it may become unstable due to the formation of a lipid-rich core and a thin fibrous cap. Inflammatory cells within the plaque, such as macrophages, secrete enzymes that degrade the...
Cardiac Action Potential01:30

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 Cycle01:25

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...

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A Research Method For Detecting Transient Myocardial Ischemia In Patients With Suspected Acute Coronary Syndrome Using Continuous ST-segment Analysis
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A Research Method For Detecting Transient Myocardial Ischemia In Patients With Suspected Acute Coronary Syndrome Using Continuous ST-segment Analysis

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Electrocardiographic changes during inhalational oleander toxicity.

Subramanian Senthilkumaran1, Ramachandran Meenakshisundaram, Andrew D Michaels

  • 1Sri Gokulam Hospitals and Research Institute, Salem, India. maniansenthil@yahoo.co.in

Journal of Electrocardiology
|March 15, 2011
PubMed
Summary
This summary is machine-generated.

Inhalational oleander toxicity can occur from burning oleander. This family experienced heart rhythm changes and ECG abnormalities, which resolved after avoiding smoke exposure.

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Published on: April 5, 2011

Area of Science:

  • Toxicology
  • Cardiology
  • Environmental Health

Background:

  • Oleander (Nerium oleander) is a common ornamental plant containing cardiac glycosides.
  • Burning oleander plant material releases toxic smoke, posing an inhalation risk.
  • Acute toxicity can manifest with cardiovascular symptoms.

Observation:

  • A family of four experienced symptoms after exposure to smoke from burning oleander twigs.
  • Electrocardiography (ECG) showed first- and second-degree atrioventricular block and digoxin-like ST-T wave changes.
  • No abnormalities were found in complete blood count, biometabolic profile, chest X-ray, or echocardiography.

Findings:

  • The observed ECG changes were consistent with oleander toxicity, despite no exposure to digoxin or other herbal toxins.
  • Symptoms and ECG abnormalities resolved within four days after cessation of exposure to the smoke.
  • This case highlights inhalational exposure as a route for oleander poisoning.

Implications:

  • Healthcare providers should consider inhalational oleander toxicity in patients presenting with unexplained cardiac conduction abnormalities.
  • Awareness of potential toxicity from burning oleander is crucial for public health, especially in areas where it is used for fuel.
  • Further research into the specific cardiac glycosides and their effects via inhalation is warranted.