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

Inertial Frames of Reference01:03

Inertial Frames of Reference

8.7K
Newton’s first law is usually considered to be a statement about reference frames. It provides a method for identifying a special type of reference frame: the inertial reference frame. In principle, we can make the net force on a body zero. If its velocity relative to a given frame is constant, then that frame is said to be inertial. So, by definition, an inertial reference frame is a reference frame where Newton's first law holds valid. Newton's first law applies to objects with...
8.7K
Non-inertial Frames of Reference01:27

Non-inertial Frames of Reference

7.1K
A reference frame accelerating or decelerating relative to an inertial frame is a non-inertial frame. To help understand this, consider what taking off in an airplane, turning a corner in a car, riding a merry-go-round, and the circular motion of a tropical cyclone all have in common. All these systems are accelerating, decelerating, or rotating relative to the Earth; hence, they all are non-inertial frames. All these systems exhibit inertial forces, which merely seem to arise from motion,...
7.1K
Chemical Shift: Internal References and Solvent Effects01:17

Chemical Shift: Internal References and Solvent Effects

1.3K
In an NMR sample, precise measurement of the absolute absorption frequencies of nuclei is difficult. A standard internal reference compound is added, and the frequency difference between the reference signal and sample signals is measured.
The internal reference compound generally used in NMR spectroscopy is tetramethylsilane (TMS). TMS is preferred because it is chemically inert, soluble in NMR solvents, and easily removable. Also, the highly shielded methyl protons in TMS yield an intense...
1.3K
Total Voids in Concrete01:12

Total Voids in Concrete

469
Total voids in concrete encompass gel water volume, capillary pores, and entrapped air. Gel water (retained within the cement hydration products) and physically entrapped or adsorbed water are significant for the hydration process. For complete hydration, it's estimated that the space needed for the products of a cubic centimeter of cement doubles. Capillary pores constitute the unoccupied space within the hydrated cement paste, with their size largely influenced by the water-to-cement...
469
Total Internal Reflection Fluorescence Microscopy01:05

Total Internal Reflection Fluorescence Microscopy

11.0K
Total internal reflection fluorescence microscopy or TIRF is an advanced microscopic technique used to visualize fluorophores in samples close to a solid surface with a higher refractive index, such as a glass coverslip. TIRF only allows fluorophores in proximity to the solid surface to be excited. When light from a medium with a lower refractive index (such as air) hits the glass coverslip at a critical angle, the light undergoes total internal reflection stead of passing through the glass.
11.0K
Static, Stagnation, Dynamic and Total Pressure01:24

Static, Stagnation, Dynamic and Total Pressure

1.5K
The concept of static, stagnation, dynamic, and total pressure is fundamental in fluid dynamics, often explained using Bernoulli's equation:
1.5K

You might also read

Related Articles

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

Sort by
Same author

Contemporary evidence in protected percutaneous coronary intervention: a case-based review.

European heart journal supplements : journal of the European Society of Cardiology·2026
Same author

Patient selection for complex, high-risk indicated percutaneous coronary intervention procedures: an overview.

European heart journal supplements : journal of the European Society of Cardiology·2026
Same author

Severe acute myocarditis induced by 5-fluorouracil with successful rechallenge after multidisciplinary cardio-oncology evaluation: a case report.

European heart journal. Case reports·2026
Same author

Cardiopulmonary Interactions During Positive Pressure Ventilation: A Clinico-Physiological Framework.

European heart journal. Acute cardiovascular care·2026
Same author

The role of angiotensin II in cardiovascular disease-induced cancer growth.

Cardio-oncology (London, England)·2026
Same author

[ANMCO-SICPED consensus document on cardio-oncological transition in childhood cancer survivors].

Giornale italiano di cardiologia (2006)·2026
Same journal

Transforming Cardiac Imaging With Artificial Intelligence: Automation, Precision, and Clinical Integration in Echocardiography and Magnetic Resonance Imaging.

Echocardiography (Mount Kisco, N.Y.)·2026
Same journal

Recurrent Ischemic Stroke Caused by a Residual PFO Shunt After Surgical Repair: Three-Dimensional Transesophageal Echocardiography-Guided Localization and Transcatheter Closure.

Echocardiography (Mount Kisco, N.Y.)·2026
Same journal

Intracardiac Echocardiography Versus Transesophageal Echocardiography for Guidance of Atrial Fibrillation Ablation: A Systematic Review and Meta-Analysis of Procedural Safety and Efficacy.

Echocardiography (Mount Kisco, N.Y.)·2026
Same journal

Efficacy Evaluation of Right-Heart Contrast Echocardiography Combined With the Valsalva Manoeuvre in Screening for Patent Foramen Ovale in Patients With Migraine Without an Identified Secondary Cause.

Echocardiography (Mount Kisco, N.Y.)·2026
Same journal

Inferior Vena Cava Ultrasound for Decongestion Assessment in Acute Heart Failure: Systematic Review.

Echocardiography (Mount Kisco, N.Y.)·2026
Same journal

Multi-Center Adversarial Bi-Phase Cross-Attention Network for Right Ventricular Segmentation and Functional Classification in Echocardiography.

Echocardiography (Mount Kisco, N.Y.)·2026
See all related articles

Related Experiment Video

Updated: Jan 23, 2026

Use of Two Intracorporeal Ventricular Assist Devices As a Total Artificial Heart
08:49

Use of Two Intracorporeal Ventricular Assist Devices As a Total Artificial Heart

Published on: May 11, 2018

9.9K

Right ventricular total isovolumic time: Reference value study.

Guido Tavazzi1,2, Andrea Boffi2, Gabriele Savioli3

  • 1Department of Clinical, Surgical, Diagnostic and Pediatric Sciences, Fondazione Policlinico San Matteo, IRCCS, University of Pavia, Pavia, Italy.

Echocardiography (Mount Kisco, N.Y.)
|June 5, 2019
PubMed
Summary
This summary is machine-generated.

Total isovolumic time (tIVT) increases with age in healthy individuals, offering a new noninvasive index for right ventricular function. This study establishes age-related reference values for RV tIVT.

Keywords:
diastolic functionechocardiographyreference valuesright ventricletotal isovolumic time

More Related Videos

Murine Short Axis Ventricular Heart Slices for Electrophysiological Studies
07:51

Murine Short Axis Ventricular Heart Slices for Electrophysiological Studies

Published on: June 4, 2017

7.9K
Studying Left Ventricular Reverse Remodeling by Aortic Debanding in Rodents
07:26

Studying Left Ventricular Reverse Remodeling by Aortic Debanding in Rodents

Published on: July 14, 2021

5.5K

Related Experiment Videos

Last Updated: Jan 23, 2026

Use of Two Intracorporeal Ventricular Assist Devices As a Total Artificial Heart
08:49

Use of Two Intracorporeal Ventricular Assist Devices As a Total Artificial Heart

Published on: May 11, 2018

9.9K
Murine Short Axis Ventricular Heart Slices for Electrophysiological Studies
07:51

Murine Short Axis Ventricular Heart Slices for Electrophysiological Studies

Published on: June 4, 2017

7.9K
Studying Left Ventricular Reverse Remodeling by Aortic Debanding in Rodents
07:26

Studying Left Ventricular Reverse Remodeling by Aortic Debanding in Rodents

Published on: July 14, 2021

5.5K

Area of Science:

  • Cardiology
  • Cardiovascular Physiology
  • Echocardiography

Background:

  • Noninvasive indices for right-sided cardiovascular physiology are limited.
  • Total isovolumic time (tIVT) is a known marker for left ventricular efficiency.
  • The study addresses the need for right ventricular (RV) tIVT reference values.

Purpose of the Study:

  • To determine normal reference values for right ventricular total isovolumic time (RV tIVT).
  • To evaluate the impact of increasing age on RV tIVT.
  • To explore correlations between RV tIVT and Doppler diastolic parameters.

Main Methods:

  • Transthoracic echocardiography was performed on 181 healthy volunteers.
  • Participants were categorized into four age groups.
  • RV tIVT was calculated using ejection and filling times; Doppler parameters (E/E', E/A) were measured.

Main Results:

  • Mean RV tIVT was 7 ± 1.1 s/min.
  • RV tIVT significantly increased with age (P < 0.0001).
  • Significant correlations were found between RV tIVT and trans-tricuspid E/E' (P < 0.0001) and E/A (P = 0.001).

Conclusions:

  • Normal RV tIVT values increase with advancing age.
  • RV tIVT is a sensitive, noninvasive index for assessing right ventricular function.
  • RV tIVT correlates significantly with Doppler diastolic parameters, aiding in cardiovascular assessment.