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Calculation of left ventricular relaxation time constant-Tau in patients with aortic regurgitation by continuous-wave Doppler.

Bai X - Open Cardiovasc Med J (2008)

Bottom Line: Left ventricular relaxation time constant, Tau, is the best index to evaluate left ventricular diastolic function.The measurement is only available traditionally in catheter lab.Similarly, formulas are developed here by pure mathematical derivative to calculate Tau by continuous-wave Doppler in patients with aortic regurgitation.

View Article: PubMed Central - PubMed

Affiliation: Henderson Research Center, McMaster University, Hamilton, Ontario, L8V 1C3, Canada. xufangbai@yahoo.com

ABSTRACT
Left ventricular relaxation time constant, Tau, is the best index to evaluate left ventricular diastolic function. The measurement is only available traditionally in catheter lab. In Echo lab, several methods of non-invasive measurement of Tau have been tried since 1992, however almost all the methods are still utilizing the same formula to calculate Tau as in catheter lab, which makes them inconvenient, time-consuming and sometimes not very accurate. A simple method to calculate Tau in patients with mitral regurgitation has been developed just based on Weiss' formula and simplified Bernoulli's equation. Similarly, formulas are developed here by pure mathematical derivative to calculate Tau by continuous-wave Doppler in patients with aortic regurgitation.

No MeSH data available.


Related in: MedlinePlus

Schematic description of aortic regurgitation spectrum. AVC is aortic valves closure, MVO is mitral valves opening, MVC is mitral valves closure and AVO is aortic valves opening.
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Figure 1: Schematic description of aortic regurgitation spectrum. AVC is aortic valves closure, MVO is mitral valves opening, MVC is mitral valves closure and AVO is aortic valves opening.

Mentions: Before mathematical deduction, let’s refresh our knowledge about continuous-wave Doppler aortic regurgitation spectrum. Fig. (1) is a schematic description of aortic regurgitation spectrum.


Calculation of left ventricular relaxation time constant-Tau in patients with aortic regurgitation by continuous-wave Doppler.

Bai X - Open Cardiovasc Med J (2008)

Schematic description of aortic regurgitation spectrum. AVC is aortic valves closure, MVO is mitral valves opening, MVC is mitral valves closure and AVO is aortic valves opening.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC2570579&req=5

Figure 1: Schematic description of aortic regurgitation spectrum. AVC is aortic valves closure, MVO is mitral valves opening, MVC is mitral valves closure and AVO is aortic valves opening.
Mentions: Before mathematical deduction, let’s refresh our knowledge about continuous-wave Doppler aortic regurgitation spectrum. Fig. (1) is a schematic description of aortic regurgitation spectrum.

Bottom Line: Left ventricular relaxation time constant, Tau, is the best index to evaluate left ventricular diastolic function.The measurement is only available traditionally in catheter lab.Similarly, formulas are developed here by pure mathematical derivative to calculate Tau by continuous-wave Doppler in patients with aortic regurgitation.

View Article: PubMed Central - PubMed

Affiliation: Henderson Research Center, McMaster University, Hamilton, Ontario, L8V 1C3, Canada. xufangbai@yahoo.com

ABSTRACT
Left ventricular relaxation time constant, Tau, is the best index to evaluate left ventricular diastolic function. The measurement is only available traditionally in catheter lab. In Echo lab, several methods of non-invasive measurement of Tau have been tried since 1992, however almost all the methods are still utilizing the same formula to calculate Tau as in catheter lab, which makes them inconvenient, time-consuming and sometimes not very accurate. A simple method to calculate Tau in patients with mitral regurgitation has been developed just based on Weiss' formula and simplified Bernoulli's equation. Similarly, formulas are developed here by pure mathematical derivative to calculate Tau by continuous-wave Doppler in patients with aortic regurgitation.

No MeSH data available.


Related in: MedlinePlus