Jove
Visualize
Contact Us
JoVE
x logofacebook logolinkedin logoyoutube logo
ABOUT JoVE
OverviewLeadershipBlogJoVE Help Center
AUTHORS
Publishing ProcessEditorial BoardScope & PoliciesPeer ReviewFAQSubmit
LIBRARIANS
TestimonialsSubscriptionsAccessResourcesLibrary Advisory BoardFAQ
RESEARCH
JoVE JournalMethods CollectionsJoVE Encyclopedia of ExperimentsArchive
EDUCATION
JoVE CoreJoVE BusinessJoVE Science EducationJoVE Lab ManualFaculty Resource CenterFaculty Site
Terms & Conditions of Use
Privacy Policy
Policies

Related Concept Videos

The Wave Nature of Light02:12

The Wave Nature of Light

61.5K
The nature of light has been a subject of inquiry since antiquity. In the seventeenth century, Isaac Newton performed experiments with lenses and prisms and was able to demonstrate that white light consists of the individual colors of the rainbow combined together. Newton explained his optics findings in terms of a "corpuscular" view of light, in which light was composed of streams of extremely tiny particles traveling at high speeds according to Newton's laws of motion.
61.5K
Prediction Intervals01:03

Prediction Intervals

3.4K
The interval estimate of any variable is known as the prediction interval. It helps decide if a point estimate is dependable.
However, the point estimate is most likely not the exact value of the population parameter, but close to it. After calculating point estimates, we construct interval estimates, called confidence intervals or prediction intervals. This prediction interval comprises a range of values unlike the point estimate and is a better predictor of the observed sample value, y. 
3.4K
COPD: Pathogenesis and Clinical Features01:20

COPD: Pathogenesis and Clinical Features

1.9K
Chronic obstructive pulmonary disease (COPD) is a group of lung conditions that progressively worsen over time, including chronic bronchitis and emphysema. This cluster of diseases collectively leads to a gradual and irreversible decline in lung function over time.
The primary cause for the onset of COPD is cigarette smoking and exposure to air pollution. These hazardous factors initiate a chain reaction within the lungs, resulting in chronic inflammation, damage to the airways, and a...
1.9K
COPD: Management Using Bronchodilators and Corticosteroids01:26

COPD: Management Using Bronchodilators and Corticosteroids

820
Chronic obstructive pulmonary isease (COPD) involves a group of progressive lung disorders characterized by persistent airflow limitation and chronic respiratory symptoms. Asthma-COPD Overlap Syndrome (ACOS), encompassing features of both asthma and Chronic obstructive pulmonary disease (COPD), is a group of progressive lung disorders that includes chronic bronchitis, emphysema, and refractory (non-reversible) asthma. ACOS leads to complex clinical presentations that combine the inflammatory...
820
Confidence Intervals01:21

Confidence Intervals

10.8K
An unbiased point estimate is often insufficient to predict a population estimate, such as population mean or population proportion. In this scenario, a confidence interval is used. A confidence interval is an estimate similar to a  sample proportion. However, unlike the point estimate which is a single value, the confidence interval  contains a range of values. These values have lower and upper limits, known as confidence limits, and can be designated as L1 and L2, respectively.
A...
10.8K
Improper Integrals: Infinite Intervals01:29

Improper Integrals: Infinite Intervals

110
An integral is classified as improper due to an infinite interval when at least one of its limits of integration extends to positive or negative infinity. In such cases, the region under the curve is unbounded, and standard techniques for evaluating definite integrals are not directly applicable. Instead, the improper integral is defined through a limiting process that allows one to determine whether the accumulated area remains finite despite the infinite domain.Application to Exponential...
110

You might also read

Related Articles

Articles linked to this work by shared authors, journal, and citation graph.

Sort by
Same author

Strain Echocardiography in MINOCA: Diagnostic and Follow-Up Implications.

Journal of clinical medicine·2026
Same author

IVUS-Guided Rescue of Catheter-Induced Left Main Coronary Artery Dissection.

Catheterization and cardiovascular interventions : official journal of the Society for Cardiac Angiography & Interventions·2026
Same author

Characteristics of Brain Metastases Identified by PET-CT Imaging in Patients with Lung Cancer.

Noro psikiyatri arsivi·2026
Same author

Efficacy of therapeutic bronchoscopic interventions in patients with unilateral total lung atelectasis secondary to lung cancer.

Respiratory medicine·2026
Same author

Single-center experience with hemoptysis in geriatric patients.

BMC geriatrics·2026
Same author

Could it Be Diagnosed Earlier? A Retrospective Analysis of Lung Cancer.

The Eurasian journal of medicine·2025

Related Experiment Video

Updated: Feb 7, 2026

A Two-interval Forced-choice Task for Multisensory Comparisons
07:13

A Two-interval Forced-choice Task for Multisensory Comparisons

Published on: November 9, 2018

11.5K

T wave peak-to-end interval in COPD.

Seda Tural Onur1, Samim Emet2, Sinem Nedime Sokucu1

  • 1Yedikule Chest Diseases and Thoracic Surgery Training and Research Hospital, Chest Disease, Zeytinburnu, Istanbul, Turkey, sedatural@yahoo.com.

International Journal of Chronic Obstructive Pulmonary Disease
|July 24, 2018
PubMed
Summary

The T wave-peak to T wave-end (Tp-Te) interval is elevated in patients with Chronic Obstructive Pulmonary Disease (COPD), indicating a potential link between COPD and cardiac issues like ventricular arrhythmias.

Keywords:
COPDTp–Te intervalcardiac morbidityventricular arrhythmia

More Related Videos

Measurements of Waves in a Wind-wave Tank Under Steady and Time-varying Wind Forcing
08:54

Measurements of Waves in a Wind-wave Tank Under Steady and Time-varying Wind Forcing

Published on: February 13, 2018

9.1K
Measurement of Coherence Decay in GaMnAs Using Femtosecond Four-wave Mixing
15:58

Measurement of Coherence Decay in GaMnAs Using Femtosecond Four-wave Mixing

Published on: December 3, 2013

6.1K

Related Experiment Videos

Last Updated: Feb 7, 2026

A Two-interval Forced-choice Task for Multisensory Comparisons
07:13

A Two-interval Forced-choice Task for Multisensory Comparisons

Published on: November 9, 2018

11.5K
Measurements of Waves in a Wind-wave Tank Under Steady and Time-varying Wind Forcing
08:54

Measurements of Waves in a Wind-wave Tank Under Steady and Time-varying Wind Forcing

Published on: February 13, 2018

9.1K
Measurement of Coherence Decay in GaMnAs Using Femtosecond Four-wave Mixing
15:58

Measurement of Coherence Decay in GaMnAs Using Femtosecond Four-wave Mixing

Published on: December 3, 2013

6.1K

Area of Science:

  • Cardiology
  • Pulmonology
  • Medical Diagnostics

Background:

  • The T wave-peak to T wave-end (Tp-Te) interval on an electrocardiogram (ECG) is a recognized indicator for cardiovascular mortality and ventricular tachyarrhythmias.
  • Chronic Obstructive Pulmonary Disease (COPD) is a significant public health concern with known cardiovascular comorbidities.

Purpose of the Study:

  • To investigate and define a novel ECG parameter, the Tp-Te interval, in patients diagnosed with COPD.
  • To explore the potential association between altered Tp-Te intervals and the presence of COPD.

Main Methods:

  • A cross-sectional observational study was conducted involving 134 patients with COPD and 40 healthy controls.
  • Demographic data, medical history, spirometry results, and electrocardiographs were systematically analyzed.
  • Tp-Te intervals were measured across all precordial leads for both COPD patients and controls.

Main Results:

  • A statistically significant increase in Tp-Te intervals was observed in the COPD group compared to the healthy control group across all precordial leads (p<0.05).
  • The V4 precordial lead demonstrated the highest diagnostic accuracy, with an area under the curve of 0.831, a sensitivity of 76.5%, and a specificity of 89.6% for identifying COPD-related ECG changes.

Conclusions:

  • The study provides robust evidence of significantly prolonged Tp-Te intervals in patients with COPD.
  • These findings suggest a potential association between COPD and an increased risk of ventricular arrhythmias and cardiac morbidity.