Pediatric Echo Z-Scores: Considering The Standard Deviation

by Dan 5/4/2008 1:59:18 PM

Here's what you need to build a pediatric echo z-score^W: your measurement a sample population of normal subjects that are of the same height/weight/BSA/whatever independent variable as your subject- from which you evaluate the: arithmetic mean of the measurement standard deviation (SD) of th... [More]

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Tags: z-scores, boston, michigan, mmode, lvedd, lv, echo

Z-Scores

Children's Hospital of Michigan: Z-Scores of Cardiac Structures

by Dan 4/21/2008 6:19:49 AM

This article is/will be absolutely huge for many pediatric echo labs: J Am Soc Echocardiogr. 2008 Apr 10 [Epub ahead of print] (PubMed link)Regression Equations for Calculation of Z Scores of Cardiac Structures in a Large Cohort of Healthy Infants, Children, and Adolescents: An Echocardiogr... [More]

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Tags: z-scores, parameterz.com, echo, michigan, aortic arch, pulmonary arteries, aortic valve, mitral valve, reference values

Z-Scores

One Tail or Two? Z-Scores and The More Normal 95 Percent

by Dan 4/11/2008 11:26:00 AM

The question is between two definitions of "95% of normal". On the one hand is the camp, like those describing the Strong Heart Study, that says: Normal is a z-score of ± 2 Their 95% is the same 95% that is the confidence interval^W, i.e.: 95% of the population falls within 1.96 standard deviat... [More]

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Tags: z-scores, reference values, severity, pediatric echo

Z-Scores

Z-Scores and Standardized Reporting of Abnormal Echo Measurements

by Dan 4/9/2008 11:44:01 AM

In what appears to be some small bit of determinism of my own, I have arrived at this point in the implementation of a data-driven, standardized echo report: Can we use z-scores to determine the severity of abnormal findings? Certainly, we are already doing this- with widely varying effect: And, f... [More]

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Tags: z-scores, severity, quantification, reference values, echo report, marfan, hlhs

Z-Scores

Left Atrial Z-Scores and Reference Values for Pediatric Echo

by Dan 4/8/2008 5:46:27 PM

That didn't take long.I was wondering what else might come out of the Mass General group's efforts in describing the "optimal scaling exponent", and here it is: Derivation of a size-independent variable for scaling of cardiac dimensions in a normal paediatric population (link)European Journal... [More]

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Tags: echocardiography, left atrium, z-scores, reference values, boston

Echo | Z-Scores

Echo Z-Score Cutoff Values Survey

by Dan 4/3/2008 7:38:00 AM

So, you have your Z-Score. Now what? Certainly, you can use it to dichotomize your findings into normal or abnormal. Possibly, you might use the z-score to further stratify your abnormal findings into mild, moderate, or severe (dilatation or hypoplasia)- which leads me to a ... [More]

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Z-Scores

Boston vs. Cincinnati Aortic Valve Z-Score Smackdown

by Dan 3/25/2008 11:02:00 PM

After overcoming my perplexity about the distribution of left atrial scores, I thought it might be interesting to look a little closer at how other normative data is predicted. For the sake of simplicity and to illustrate the point, the estimation of BSA from height and weight has been omitt... [More]

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Z-Scores

Left Atrial Dimension: Echo Normal Values

by Dan 3/16/2008 11:01:00 PM

Usually, I would not find much interest in the discussion of normal values of echocardiographic measures in the adult population- my interests are primarily in the field of pediatric echocardiography- but the sheer size of this study caught my attention: 15,667 normal patients. That is one l... [More]

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Echo | Z-Scores

Cardiac Cath Diagrams: Not Just For Cath Anymore

by Dan 3/2/2008 11:38:00 PM

My physiology professor called them "cartoons". One of our docs here called them "valentines". However you refer to them, the diagrams that comprise Congenital Heart Disease, A Diagrammatic Atlas are, without a doubt, indispensable for students an... [More]

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Echo

Pediatric M-mode Z-Scores

by Dan 2/17/2008 4:21:00 PM

Following up on a previous post, I finished off what I thought were the more useful z-score calculations based on data from the article "Normal values of M mode echocardiographic measurements of more than 2000 healthy infants and children in central Europe" (link). Included in thi... [More]

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Z-Scores

A Fortuitous Concatenation

of shadows

Pediatric Echo Z-Scores: Considering The Standard Deviation

Children's Hospital of Michigan: Z-Scores of Cardiac Structures

One Tail or Two? Z-Scores and The More Normal 95 Percent

Z-Scores and Standardized Reporting of Abnormal Echo Measurements

Left Atrial Z-Scores and Reference Values for Pediatric Echo

Echo Z-Score Cutoff Values Survey

Boston vs. Cincinnati Aortic Valve Z-Score Smackdown

Left Atrial Dimension: Echo Normal Values

Cardiac Cath Diagrams: Not Just For Cath Anymore

Pediatric M-mode Z-Scores

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