Hemodynamic parameters measured by impedance cardiography at baseline and 90 seconds after passive leg raising (PLR) in pregnant and non-pregnant women.

Data are presented as mean ± SD. % Change is the difference between values obtained at baseline and after PLR in percent.#Represents the p-value for the difference between baseline and PLR (paired sample t-test) within pregnant and non-pregnant groups.*Represents the p-value for the difference in % change between pregnant and non-pregnant groups (independent sample t-test). SI, stroke index; CI, cardiac index; BPS, systolic blood pressure; BPD, diastolic blood pressure; SVRI, systemic vascular resistance index; ACI, accelerated cardiac index; LWCI, left ventricular work index; PEP, pre-ejection period; LVET, left ventricular ejection time; VI, velocity index and STR, systolic time ratio.