
A study compared the ophthalmic artery peak systolic velocity (PSV) ratio at 35–37 weeks' gestation among women who delivered small‐for‐gestational‐age (SGA) or growth‐restricted (FGR), neonates in the absence of hypertensive disorders. Assuming that the ophthalmic artery PSV ratio is a reflection of the interplay between cardiac output and peripheral vascular resistance, the linear association between PSV ratio and birth‐weight Z‐score in non‐hypertensive pregnancies suggests the presence of a continuous physiological relationship between fetal size and cardiovascular response rather than a dichotomous relationship between high peripheral resistance and low cardiac output is small compared with non‐small fetuses.
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