*"The beauty of nature lies in her simplicity."*

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.

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"

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