. Author manuscript; available in PMC: 2020 Jul 1.

Published in final edited form as: J Am Soc Echocardiogr. 2019 Jul;32(7):884–894.e4. doi: 10.1016/j.echo.2019.03.015

Table 4.

PAAT measures in uncomplicated preterm infants by age beyond the 1^st week

Age (wk)	Infants^* (n)	HR (beats/min)	PAAT (msec)	PAAT/REVT
3–5	40	165 ± 12	51 ± 9	0.28 ± 0.01
6–8	57	163 ± 13	55 ± 5	0.29 ± 0.02
9–11	18	158 ± 10	58 ± 4	0.30 ± 0.04
60–79	26	138 ± 12	75 ± 4	0.32 ± 0.03
80–99	4	132 ± 11	78 ± 3	0.33 ± 0.02

Data are expressed as mean ± SD.

HR, Heart rate.

Uncomplicated, defined as infants without BPD or echocardiographic signs of pulmonary hypertension at 32 or 36 weeks. There were 48 uncomplicated preterm infants at 32 weeks’ PMA, 67 uncomplicated preterm infants at 36 weeks’ PMA, and 30 uncomplicated preterm infants at 1 year corrected age. PMA and/or hemodynamically significant PDA at days 5 to 7 or any size PDA at 32 or 36 weeks’ PMA.