Table 4

Univariate haemodynamic predictors of S1 and S2 complexity

	B (unstd)	CI	p Value
V3 S2 complexity
Mean pulmonary artery pressure	0.07	0.05 to 0.10	<0.0001
Heart rate	−0.01	−0.06 to 0.05	0.85
Pulmonary capillary wedge pressure	−0.11	−0.25 to 0.03	0.13
Cardiac output (Fick)	−0.27	−0.71 to 0.18	0.23
Right atrial pressure
Mean systemic artery pressure	0.02	−0.04 to 0.07	0.58
V4 S2 complexity
Mean pulmonary artery pressure	0.14	0.08 to 0.19	<0.0001
Heart rate	0.03	−0.09 to 0.15	0.63
Pulmonary capillary wedge pressure	−0.09	−0.36 to 0.19	0.52
Cardiac output (Fick)	−0.46	−1.53 to 0.62	0.40
Right atrial pressure	0.04	−0.20 to 0.28	0.74
Mean systemic artery pressure	0.02	−0.12 to 0.15	0.81
V3 S1 complexity
Mean pulmonary artery pressure	−0.01	−0.04 to 0.02	0.46
Heart rate	−0.01	−0.06 to 0.03	0.51
Pulmonary capillary wedge pressure	−0.09	−0.21 to 0.03	0.15
Cardiac output (Fick)	0.37	0.02–0.72	0.04
Right atrial pressure	−0.13	−0.24 to −0.02	0.02
Mean systemic artery pressure	0.04	−0.01 to 0.08	0.11
V4 S1 complexity
Mean pulmonary artery pressure	−0.04	−0.07 to −0.004	0.03
Heart rate	−0.03	−0.08 to 0.02	0.24
Pulmonary capillary wedge pressure	0.09	−0.06 to 0.23	0.23
Cardiac output (Fick)	0.49	0.04 to 0.93	0.03
Right atrial pressure	−0.10	−0.22 to 0.03	0.12
Mean systemic artery pressure	0.02	−0.04 to 0.07	0.57