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Related Concept Videos

Quartile01:15

Quartile

Quartiles are numbers that separate the data into quarters. Quartiles may or may not be part of the data. To find the quartiles, first, find the median or second quartile. The first quartile, Q1, is the middle value of the lower half of the data, and the third quartile, Q3, is the middle value, or median, of the upper half of the data. To get the idea, consider the same data set:
1; 1; 2; 2; 4; 6; 6.8; 7.2; 8; 8.3; 9; 10; 10; 11.5
The median or second quartile is seven. The lower half of the...
Dysrhythmias IV: Characteristics of Bradyarrhythmias01:18

Dysrhythmias IV: Characteristics of Bradyarrhythmias

Bradyarrhythmias are cardiac rhythm disorders characterized by a slower-than-normal heart rate, typically defined as fewer than 60 beats per minute. Some of which are discussed here:Sinus BradycardiaSinus bradycardia presents a heart rate lower than 60 beats per minute, with a regular rhythm originating from the SA node. The ECG typically shows normal P waves preceding each QRS complex, a normal PR interval (0.12 to 0.20 seconds), and a normal QRS duration (0.06 to 0.10 seconds).First-Degree AV...
Antiarrhythmic Drugs: Class III Agents as Potassium Channel Blockers01:12

Antiarrhythmic Drugs: Class III Agents as Potassium Channel Blockers

Class III antiarrhythmic drugs are a group of medications that can prolong action potentials in the heart. They achieve this by blocking potassium channels or enhancing inward currents from sodium channels. However, these drugs have a unique property of "reverse use-dependence," which is most pronounced at slower heart rates and can lead to torsades de pointes—a specific type of arrhythmia. However, it is essential to note that excessive QT interval prolongation—a measure of the heart's...
Noncompartmental Analysis: Mean Residence Time01:05

Noncompartmental Analysis: Mean Residence Time

According to statistical moment theory, mean residence time (MRT) is an important measure in pharmacokinetics. MRT can be defined as the expected mean of a probability density function distribution. It provides valuable insights into drug disposition in the body.
After the administration of a drug through intravenous bolus injection, the drug molecules are distributed throughout the body and remain there for varying periods. The MRT represents the average time these drug molecules stay in the...
Pharmacokinetic–Pharmacodynamic Relationship: Duration of Dose-Effect Relationship01:14

Pharmacokinetic–Pharmacodynamic Relationship: Duration of Dose-Effect Relationship

For drugs producing a quantal response, onset occurs when plasma concentration reaches a minimum effective level (Cmin). The drug's action duration depends on how long the plasma concentration remains above Cmin.Two primary factors influence this duration: dose size and the rate of drug removal from the action site. Both depend on the drug's redistribution to poorly perfused tissues and elimination processes. A larger dose promotes rapid onset and prolongs the effect's duration.Consider a...
Disturbances in Heart Rhythm01:29

Disturbances in Heart Rhythm

Arrhythmia or dysrhythmia refers to an abnormal heart rhythm caused by a defect in the heart's conduction system. It can cause the heart to beat irregularly, too quickly, or too slowly, leading to symptoms like chest pain, shortness of breath, and fainting. Factors such as stress, caffeine, alcohol, nicotine, cocaine, certain drugs, congenital defects, diseases, and electrolyte abnormalities can trigger arrhythmias.
Arrhythmias are categorized by their speed, rhythm, and origin. A slow heart...

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In Vivo Surface Electrocardiography for Adult Zebrafish
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Fatal QT interval.

Jérôme Fichet1, Olivier Genee, Bertand Pierre

  • 1Réanimation Médicale Polyvalente, CHU Bretonneau, Tours 37000, France. jfichet@hotmail.com

The American Journal of Emergency Medicine
|July 9, 2008
PubMed
Summary
This summary is machine-generated.

A young woman experienced cardiac arrest due to short-QT syndrome, a genetic disorder affecting heart rhythm. Early defibrillation is crucial for preventing sudden cardiac death in affected individuals.

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Area of Science:

  • Cardiology
  • Genetics
  • Electrophysiology

Background:

  • Short-QT syndrome is a rare genetic disorder characterized by a significantly shortened QT interval on an electrocardiogram.
  • It is caused by ion channel dysfunction, leading to abbreviated cardiac action potentials and increased risk of life-threatening arrhythmias.
  • Individuals with short-QT syndrome often present with syncope, atrial fibrillation, or sudden cardiac death, despite having a structurally normal heart.

Observation:

  • A 21-year-old woman with no prior medical history presented with cardiac arrest, successfully resuscitated with return of sinus rhythm.
  • Electrocardiogram revealed a short QT interval; other potential causes for QT shortening were excluded.
  • Despite initial stabilization, the patient experienced a fatal episode of ventricular fibrillation approximately one hour after admission.

Findings:

  • The case highlights a young patient with a confirmed short QT interval, a known risk factor for sudden cardiac death.
  • The rapid progression from resuscitation to a lethal arrhythmia underscores the unpredictable and severe nature of short-QT syndrome.
  • Exclusion of common causes of QT shortening emphasizes the genetic basis of the observed cardiac electrical abnormality.

Implications:

  • This case underscores the critical importance of early diagnosis and management of short-QT syndrome.
  • Internal cardiac defibrillator implantation is currently the only effective preventive strategy against sudden cardiac death in this condition.
  • Further research into the genetic underpinnings and novel therapeutic approaches for short-QT syndrome is warranted to improve patient outcomes.