The Harvard method was invented in 1992 by Dr James Thomas from Harvard and got a brief experimental verification.

# left ventricular diastolic time constant

## Is Tau dispensable?

The heart provides energy to the circulation system. In terms of cardiac function assessment, we really want to know how powerful it is. Unfortunately, direct measurement of pressure is not available in an Echo lab. Tau is closely related to the active relaxation of LV. Now, we know the formulas to calculate Tau. This new vision has already led us to the universal Tau and "Symmetry". More adventures await you.

## A Brief History of Tau with Links You Might Need!

*A Brief History of Tau*

1976, Tau was born in John Hopkins.

1992, the first non-invasive try, Harvard.

1992, the first formula, with four assumptions, Harvard.

1993, another non-invasive try with decent data, Mayo Clinic.

1995, a similar strategy applied to AI patients, Japan.

1995, I published a MR based formula with one assumption.

1997, the Harvard formula was validated in Cleveland.

2005, Langer presented a non-zero asymptote model.

2008, I improved my MR based formulas, without assumption.

2008, I did a similar deduction for AI based Tau.

2008, Chen developed program for my formulas, free download.

2008, my poster in ASE 19th Annual Scientific Sessions.

2009, my poster in CSE forum.

2009, DF guideline (ASE) recommended Harvard formula.

2009, I gave my opinion about the guideline recommendation.

2009, "Response to Bai" from guideline writing group. It motivated me to create this Blog.

2010, Dr Wang and me presented general Tau.

2008, Chen developed program for my formulas, free download.

2008, my poster in ASE 19th Annual Scientific Sessions.

2009, my poster in CSE forum.

2009, DF guideline (ASE) recommended Harvard formula.

2009, I gave my opinion about the guideline recommendation.

2009, "Response to Bai" from guideline writing group. It motivated me to create this Blog.

2010, Dr Wang and me presented general Tau.

2011-11-29, I gave a talk in National Capital Echo Round (Ottawa)

2016-03-29, I gave a talk at the Heart Institute, the North Hospital (Shenyang, China)

2016-04-01, I gave a talk at the Cardiac Function Dept., the 1st Clinical College, Chinese University of Medicine. (Shenyang, China)

2016, Symmetry inspired by the approach of Tau.

2017, Calculation of LAP (based on my formulas) got a Chinese Natural Science Founding.

2020-1-1, response to "response to Bai"

## Sunday, June 28, 2020

### Not Only Tau

Tau renders us a new approach to the cardiac function assessment. Since Tau is directly related to how powerful the muscle is at the beginning of diastole, it is well accepted as the best index to describe diastolic function.

## Saturday, February 15, 2020

### Anversa Opened a Wrong Door, Thomas Closed a Right Door

When I read The
Emperor’s New Clothes as a kid, I did not take it seriously. Funny though, I
did not think it would ever happen for that was just the adults’ wild
imagination to fool the kids around. After growing up, I realized this can truly happen in the adults’ world. Jaw droppingly, smart and decent people are
usually involved.

## Thursday, December 19, 2019

## Monday, October 16, 2017

## Sunday, October 9, 2011

### A Small Step in Math, A True Stride in Cardiology

With the progress of Doppler and modern computer technology, I believe that only a few RBCs’ leaking will be needed to give us a much understandable and clear regurgitation curve. Theoretically, merely a short part of the curve is enough to calculate the Tau. As long as we are allowed to choose 3 points from within the definition field, we can use the updated formulas to proceed. Let’s assume the 3 points are a (v

_{a}, t_{a}), b (v_{b}, t_{b}) and c (v_{c}, t_{c}) from left to right. The updated formulas are:## Sunday, December 5, 2010

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