Blalock–Hanlon procedure

Blalock–Hanlon procedure
ICD-9-CM 35.42

The Blalock–Hanlon procedure is a surgical procedure involving the heart.

It involves the intentional creation of a septal defect in order to alter the flow of oxygenated blood. It was devised as a palliative correction for transposition of the great vessels.

It was developed by Vivien Thomas at the Hunterian Laboratory ("the dog house") of Johns Hopkins and described by Alfred Blalock and C. Rollins Hanlon.

It was described in 1950.[1]


  1. Catherine A. Neill; Edward B. Clark (28 February 1995). The developing heart: a 'history' of pediatric cardiology. Springer. pp. 61–. ISBN 978-0-7923-3375-3. Retrieved 21 June 2011.

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