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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.
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