# left ventricular diastolic time constant

## Is Tau dispensable?

Left ventricular diastolic time constant, Tau is the most established index to describe diastolic function. A Harvard method of Tau was invented by Dr JD Thomas has been dominant non-invasive Tau measurement for more than two decades. Now, Tau is dead clinically. Only when the logically flawed celebrity method is objectively reassessed and discarded, can Tau be given a chance. A new method is dawning and promising…

## 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, 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.

## Friday, December 25, 2020

## Sunday, December 13, 2020

### Tau2020

One year ago, we realized the dominant Harvard Tau method has to be removed after so many rejections it caused. The reasons of rejection are “priority is not high enough”, “the Harvard Tau method is better”, “this is between Dr JD Thomas and you”…So,

## Wednesday, November 11, 2020

### The 7th letter to Dr JD Thomas

Dear Dr Thomas,

This is the 7^{th} letter to you. Because all the previous ones were ignored, it might be a good idea to go public.

Inspired by the recent American election, let’s give each other a chance by exchanging ideas.

Xufang

## Sunday, September 6, 2020

## Thursday, September 3, 2020

## Sunday, June 28, 2020

### The Harvard Method of Tau Papers Should be Retracted

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