Ultrasound in Med. & Biol. Vol. 14, No. 4, p. 309, 1988 0301-5629/88 $3.00 + .00 Printed in the U.S.A. (c) 1988 Pergamon Press plc. All rights reserved.

ERRATUM

RESISTANCE AREA PRODUCT IN NEONATAL CEREBRAL ARTERIES

Sir,

In our recent article on haemodynamic indices derived from

cerebral arteries of very low birth weight infants during

the first week of life (Evans et al 1988), we inadvertently

changed the exponent of the values of resistance area

product (RAP) quoted in table 2 and fig 6 from 104 to 10 -4 ,

resulting in values that are 108 times too small. Typical

values of RAP are therefore of the order of 105 kg m -2 s -I.

The statistics and conclusions of our paper are unchanged by

this error. We apologize for any confusion this may have

caused.

Yours faithfully

D H Evans, M I Levene, D B Shortland, L N J Archer

Departments of Medical Physics and Child Health

Leicester Royal Infirmary

Leicester LEI 5WW

Reference

Evans D H, Levene M I, Shortland D B and Archer L N J (1988)

Resistance index, blood flow velocity, and resistance-area

product in the cerebral arteries of very low birth weight

infants during the first week of life. Ultrasound Med Biol

14, 103-110.