. 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 3.

PAAT measures in healthy uncomplicated preterm infants by weight

Weight (kg)	Infants^* (n)	HR (beats/min)	PAAT (msec)	PAAT/RVET
0.5–0.9	66	172 ± 14	43 ± 4	0.27 ± 0.03
1.0–1.4	82	168 ± 12	52 ± 4	0.28 ± 0.01
1.5–1.9	62	163 ± 11	53 ± 5	0.29 ± 0.04
2.0–2.4	50	159 ± 15	54 ± 4	0.30 ± 0.02
2.5–2.9	21	161 ± 13	56 ± 6	0.30 ± 0.03
8.0–9.0	16	138 ± 17	77 ± 5	0.32 ± 0.03
10.0–12.0	14	135 ± 15	80 ± 8	0.33 ± 0.02

HR, Heart rate.

Data are expressed as mean ± SD.

Healthy uncomplicated cohort, defined as preterm infants without BPD, echocardiographic signs of pulmonary hypertension at 32 or 36 weeks’ PMA, and/or hemodynamically significant PDA at days 5 to 7 or any size PDA at 32 or 36 weeks’ PMA. At day 1, n = 65; at day 2, n = 65; at days 5 to 7, n = 36; at 32 weeks’ PMA, n = 48; at 36 weeks’ PMA n = 67; and at 1-year corrected age, n = 30.