Figure 4. Relationship between baseline microvascular blood flow at 24 hr and H₂S turnover on day 2 of postnatal life.

H₂S turnover (measured as urinary thiosulphate) was significantly correlated with baseline microvascular blood flow in preterm male neonates 29–36 wk GA (Pearson correlation; p = 0.04, r = 0.43). No relationship was observed for females of the same gestational age, very preterm neonates (24–28 wk GA) or term neonates (37+wk GA).