Table 2.

Echocardiography characteristics before and after treatment of the groups

	Short course of oral paracetamol			Long course of oral paracetamol			Intravenous paracetamol
	Pre	Post	P	Pre	Post	P	Pre	Post	P
PDA diameter (mm)	2.8 (2.6–3.0)	3.1 (3.0–3.1)	0.04	2.4 (2.2–2.5)	1.4 (1.0–1.8)	0.03	3.7 (3.2–4.3)	0 (0–1.1)	<0.01
Left atrium:aortic ratio	2.4 (2.3–2.5)	2.5 (2.2–2.7)	0.46	2.0 (1.8–2.3)	1.8 (1.8–1.9)	0.07	2.00 (1.85–2.80)	1.85 (1.31–2.24)	0.03
IVRT (msec)	36 (34–37)	36 (34–37)	0.29	39 (35–41)	52 (47–57)	0.08	44 (37–57)	48 (43–54)	0.67
LVO (ml/min/kg)	328 (305–385)	358 (334–555)	0.27	435 (395–533)	321 (246–350)	0.03	271 (238–390)	192 (184–224)	0.03
LVEDD (mm)	16 (12–20)	18 (16–21)	0.19	16 (13–17)	16 (11–17)	0.68	14 (12–16)	13 (11–13)	0.09

Data are presented as medians (interquartile range).

IVRT, isovolumic relaxation time; LVO, left ventricular output; LVEDD, left ventricular end diastolic velocity; PDA, patent ductus arteriosus.