# TAPSE Z-Score Calculator

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Reference Values for Right Ventricular Systolic Function

## Methods:

The technique cited by both articles is:

TAPSE was measured
by two-dimensional echocardiograph-guided M-mode recordings
from the apical four-chamber view with the cursor placed
at the free wall of the tricuspid annulus ... align the sample volume as vertical as
possible with respect to the cardiac apex ... Maximal TAPSE was determined
by the total excursion of the tricuspid annulus from its highest position
after atrial ascent to the lowest point of descent during ventricular
systole.

## References:

Systolic Right Ventricular Function in Preterm and Term Neonates: Reference Values of the Tricuspid Annular Plane Systolic Excursion (TAPSE) in 258 Patients and Calculation of Z-Score Values.
Koestenberger M, Nagel B, Ravekes W, Urlesberger B, Raith W, Avian A, Halb V, Cvirn G, Fritsch P, Gamillscheg A.
Neonatology. 2011 Jan 26;100(1):85-92

Right ventricular function in infants, children and adolescents: reference values of the tricuspid annular plane systolic excursion (TAPSE) in 640 healthy patients and calculation of z score values.
Koestenberger M, Ravekes W, Everett AD, Stueger HP, Heinzl B, Gamillscheg A, Cvirn G, Boysen A, Fandl A, Nagel B.
J Am Soc Echocardiogr. 2009 Jun;22(6):715-9

## About:

This z-score calculator uses the table data published with the articles. The 1SD values are calculated
by first determining if the measured value (score) is above or below
the mean, then dividing by two the difference between the mean and the appropriate 2SD value, e.g.:

`SD = [+2SD - mean] / 2 `

The z-score is then calculated in the conventional manner:

`z = [score - mean] / SD `

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