Haller index

Haller Index is a medical measurement used in the diagnosis and evaluation of Pectus Excavatum, a chest wall deformity. It is calculated by dividing the transverse diameter (the distance across the chest) by the anteroposterior diameter (the distance from the sternum to the spine).

Calculation

The Haller Index is calculated using a CT scan of the chest. The transverse diameter (the widest distance across the chest) is divided by the anteroposterior diameter (the shortest distance between the sternum and the spine). A normal Haller Index is approximately 2.5. A Haller Index greater than 3.25 is generally considered indicative of Pectus Excavatum.

Clinical Significance

The Haller Index is used to determine the severity of Pectus Excavatum and to guide treatment decisions. It is also used to monitor the progress of the condition over time. However, it is not the only factor considered in the diagnosis and treatment of Pectus Excavatum. Other factors, such as the patient's symptoms and overall health, are also important.

Limitations

While the Haller Index is a useful tool in the evaluation of Pectus Excavatum, it has some limitations. It does not take into account the asymmetry of the chest wall, which is common in Pectus Excavatum. It also does not consider the impact of the condition on the patient's respiratory function.

See Also

• Pectus Excavatum
• Computed Tomography

References

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