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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

The curve derived from Eq. (10) shows the relation of Tau/(t3-t1) and ADP.
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Figure 3: The curve derived from Eq. (10) shows the relation of Tau/(t3-t1) and ADP.

Mentions: To better understand the relation of ADP and Tau/(t3-t1), Fig. (3) is plotted based on Eq. (10).


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

Bai X - Open Cardiovasc Med J (2008)

The curve derived from Eq. (10) shows the relation of Tau/(t3-t1) and ADP.
© Copyright Policy - open-access
Related In: Results  -  Collection

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

Figure 3: The curve derived from Eq. (10) shows the relation of Tau/(t3-t1) and ADP.
Mentions: To better understand the relation of ADP and Tau/(t3-t1), Fig. (3) is plotted based on Eq. (10).

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