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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...
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...
Dysrhythmias V: Evaluating Dysrhythmias01:30

Dysrhythmias V: Evaluating Dysrhythmias

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...
Pulse rhythm01:30

Pulse rhythm

Pulse rhythm refers to the pattern of pulsations within specific intervals, offering valuable insights into the regularity or irregularity of the heart's beats as observed through the pattern of pulsation within specific intervals. A regular pulse exhibits a consistent heart rate with uniform waveforms and pulsation force, variations of which can be classified as normal, weak, or bounding.
Conversely, an irregular pulse pattern is termed dysrhythmia, stemming from disruptions in cardiac muscle...
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...
Holter Monitor: 24-Hour Monitoring01:23

Holter Monitor: 24-Hour Monitoring

Holter monitoring is a continuous electrocardiography (ECG) recording that tracks the heart's electrical activity over an extended period, generally 24 to 48 hours. This noninvasive diagnostic tool detects irregular heart rhythms that may not be captured during a standard ECG performed in a clinical setting.DeviceThe Holter monitor is a portable, small device connected to several electrodes on the patient's chest. These electrodes detect the heart's electrical signals and transmit them to the...

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Related Experiment Video

Updated: Jun 6, 2026

A Research Method For Detecting Transient Myocardial Ischemia In Patients With Suspected Acute Coronary Syndrome Using Continuous ST-segment Analysis
18:11

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

Published on: December 28, 2012

[Electrocardiogram changes in shift workers].

M Meloni1, A Del Rio, D Setzu

  • 1Dipartimento di Sanità Pubblica, Sezione di Medicina del Lavoro, Università degli Studi di Cagliari, Asse didattico, Policlinico Universitario, Monserrato. melonim@medicina.unica.it

La Medicina Del Lavoro
|November 25, 2010
PubMed
Summary
This summary is machine-generated.

Shift work did not significantly alter electrocardiogram (ECG) morphology. However, the frequency-adjusted QT interval (QTc) showed an age-related increase in 8-hour shift workers, suggesting potential cardiovascular risks.

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Area of Science:

  • Occupational Health
  • Cardiology
  • Sleep Medicine

Context:

  • Shift work is associated with adverse health outcomes, including cardiovascular disease.
  • Electrocardiographic (ECG) changes are indicators of cardiac health.
  • Understanding the impact of different shift schedules on ECG parameters is crucial for worker well-being.

Purpose:

  • To investigate the prevalence of ECG changes, including conduction disorders, repolarization alterations, and the frequency-adjusted QT interval (QTc), in relation to shift work.
  • To compare ECG findings between fixed-hour workers and those on different shift schedules (24-hour and 8-hour shifts).

Summary:

  • A cross-sectional survey of 125 male subjects (60 fixed-hour, 65 shift workers) examined ECGs and QTc intervals.
  • No significant differences in QTc interval or ECG morphology were found based on shift type.
  • A trend of increasing QTc interval with age was observed specifically in 8-hour shift workers.

Impact:

  • This study suggests that while overall ECG morphology may not be directly affected by shift work, specific age-related changes in QTc interval among 8-hour shift workers warrant further investigation.
  • Findings highlight the need for targeted health monitoring for shift workers, particularly concerning cardiovascular health.
  • Results contribute to the understanding of occupational health risks associated with non-standard work schedules.