Sokolov–Ternov effect: Difference between revisions

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[[File:Haller index PE.jpg|thumb|A CT scan showing a 3.58 index]]
The '''Haller index''', created in 1987 by Dr. Haller, Dr. Kramer, and Dr. Lietman,<ref>Haller JA, Kramer SS, Lietman A. Use of CT scans in
selection of patients for pectus excavatum surgery: a
prelminary report. J Pediatr Surg 1987;22:904-6</ref> is a mathematical relationship that exists in a human [[chest]] section observed with a [[CT scan]]. It is defined as the [[ratio]] of the transverse diameter (the horizontal distance of the inside of the [[ribcage]]) and the anteroposterior diameter (the shortest distance between the [[vertebrae]] and [[Human sternum|sternum]]).<ref>{{cite web|url=http://www.scielo.br/pdf/jbpneu/v30n6/en_a03v30n6.pdf|title=How the Haller is measured. Departament of Cardiology and Pulmonology of the Hospital das Clínicas da Faculdade de Medicina da Universidade de São Paulo – Thoracic Surgery Sector|format=PDF}}</ref> It is of diagnostic use ''[[in vivo]]''.
 
:<math>\ HI = \frac {distance1}{distance2}</math>
 
where:
: '''HI''' is the Haller Index
: ''distance1'' is the distance of the inside ribcage
: ''distance2'' is the distance between the sternum and vertebrae.
 
A normal Haller index should be about 2.5. Chest wall deformities such as [[pectus excavatum]] can cause the sternum to invert, thus increasing the index, which can reach 3.25 or even as high as 5.5<ref>{{cite news|url=http://findarticles.com/p/articles/mi_m0FSL/is_6_74/ai_81218971|title=Haller ranges | work=AORN Journal | first=Barbara | last=Swoveland | year=2001}}</ref>
 
==See also==
*[[Pectus excavatum]]
*[[Pectus carinatum]]
*[[Nuss procedure]]
 
==Sources==
{{Reflist}}
 
[[Category:Equations]]

Revision as of 05:53, 28 August 2013

A CT scan showing a 3.58 index

The Haller index, created in 1987 by Dr. Haller, Dr. Kramer, and Dr. Lietman,[1] is a mathematical relationship that exists in a human chest section observed with a CT scan. It is defined as the ratio of the transverse diameter (the horizontal distance of the inside of the ribcage) and the anteroposterior diameter (the shortest distance between the vertebrae and sternum).[2] It is of diagnostic use in vivo.

where:

HI is the Haller Index
distance1 is the distance of the inside ribcage
distance2 is the distance between the sternum and vertebrae.

A normal Haller index should be about 2.5. Chest wall deformities such as pectus excavatum can cause the sternum to invert, thus increasing the index, which can reach 3.25 or even as high as 5.5[3]

See also

Sources

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  1. ↑ Haller JA, Kramer SS, Lietman A. Use of CT scans in selection of patients for pectus excavatum surgery: a prelminary report. J Pediatr Surg 1987;22:904-6
  2. ↑ Template:Cite web
  3. ↑ Template:Cite news
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