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Related Concept Videos

Electrocardiogram01:29

Electrocardiogram

7.8K
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...
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ECG Interpretation of Arrhythmias II: Atrial, Junctional and Ventricular Arrhythmias01:25

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

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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...
947
Dysrhythmias V: Evaluating Dysrhythmias01:30

Dysrhythmias V: Evaluating Dysrhythmias

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Dysrhythmias, also known as arrhythmias, are disturbances in the heart's rhythm that range from benign to life-threatening. A thorough evaluation is crucial for appropriate management and involves a comprehensive medical history, physical examination, and various diagnostic tests.Medical HistorySymptoms: Collect detailed information on palpitations, dizziness, syncope, chest pain, and fatigue. Note their onset, frequency, and triggers.Previous Cardiac Issues: Document any history of heart...
471
Dysrhythmias I: Introduction01:15

Dysrhythmias I: Introduction

783
Dysrhythmias refers to abnormalities in the heart's rhythm. They result from disruptions in the heart's electrical conduction system, which includes the sinoatrial(SA)node, atrioventricular(AV) node, the bundle of His, bundle branches, and Purkinje fibers.Definition and PathophysiologyDysrhythmias result from disorders of impulse formation, impulse conduction, or both. The heart contains specialized cells in the sinoatrial node, atrioventricular node, and the bundle of His and Purkinje fibers...
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Disturbances in Heart Rhythm01:29

Disturbances in Heart Rhythm

3.6K
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...
3.6K
Diabetes Mellitus: Type 2 and Gestational01:22

Diabetes Mellitus: Type 2 and Gestational

5.5K
Type 2 diabetes, characterized by insulin resistance, arises when the insulin receptors on cells lose responsiveness to insulin, diminishing the cell's capacity to take up glucose, resulting in elevated blood glucose levels. To receive a diagnosis of Type 2 diabetes, a series of blood glucose tests are necessary to assess whether the blood glucose falls within normal parameters. If the result is out of the normal range, a patient may be diagnosed as prediabetic or diabetic, depending on the...
5.5K

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Related Experiment Video

Updated: Mar 28, 2026

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 in diabetes mellitus.

O Kittnar1

  • 1Institute of Physiology, First Medical Faculty, Charles University, Prague, Czech Republic. okittnar@lf1.cuni.cz.

Physiological Research
|December 18, 2015
PubMed
Summary

Diabetes mellitus (DM) is linked to poor heart health, often presenting silently. Electrocardiogram (ECG) changes in diabetic patients, while not specific, indicate sympathetic nervous system overactivity.

Area of Science:

  • Cardiology
  • Diabetology
  • Clinical Electrophysiology

Background:

  • Diabetes mellitus (DM) is strongly associated with adverse cardiovascular outcomes.
  • Diabetic neuropathy can lead to asymptomatic coronary artery disease, complicating diagnosis.
  • Standard 12-lead ECGs may appear normal even in advanced coronary artery disease in diabetic patients.

Purpose of the Study:

  • To investigate specific electrocardiographic (ECG) markers for myocardial damage in diabetic patients.
  • To identify ECG changes indicative of cardiovascular complications in DM.
  • To explore the relationship between ECG abnormalities and cardiac autonomic neuropathy in diabetes.

Main Methods:

  • Analysis of various electrocardiographic parameters beyond the standard 12-lead resting ECG.

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  • Evaluation of repolarization body surface isopotential maps.
  • Assessment of heart rate variability (HRV) findings.

    • Main Results:

    • Diabetic patients without cardiovascular complications exhibit tachycardia, shortened QRS and QT intervals, increased QT dispersion, reduced depolarization wave amplitudes, and flattened T waves.
    • These ECG changes are more pronounced in patients with cardiac autonomic neuropathy.
    • ECG alterations in DM are not specific and likely result from increased sympathetic nervous system tone, supported by HRV data.

    Conclusions:

    • Specific ECG findings in diabetes mellitus suggest underlying myocardial changes.
    • The observed electrocardiographic abnormalities are primarily attributed to sympathetic nervous system overactivity.
    • These findings highlight the need for comprehensive cardiovascular assessment in diabetic patients.