Elsevier

American Heart Journal

Volume 75, Issue 4, April 1968, Pages 459-464
American Heart Journal

Clinical communication
The macruz index in the healthy newborn and infant

https://doi.org/10.1016/0002-8703(68)90004-5Get rights and content

Abstract

Measurements of Macruz index, P wave duration, P-R segment, and P-R interval were made on 592 ECG's from 68 healthy full-term and 82 healthy premature infants. In full-term infants serially examined during the first week of life, the Macruz index is greatest immediately after birth and then decreases significantly. In premature infants, the index increases from 5 weeks to 16 months of age. Possible causes of these findings are discussed.

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Cited by (1)

Supported by grants from the American Heart Association, National Institutes of Health (1 TO1 HD 166-01) and the Association for Aid to Crippled Children.

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