Variable% change (gestational age by which change occurs)Ref.Stroke volume18% increase (36–39 weeks)[15]

Does vascular resistance decrease during pregnancy?

In the first trimester, there is a substantial decrease in peripheral vascular resistance, which decreases to a nadir during the middle of the second trimester with a subsequent plateau or slight increase for the remainder of the pregnancy3 (Figure 1). The decrease is ≈35% to 40% of baseline.

Does HRV decrease when pregnant?

Conclusion: There is global HRV reduction in normal pregnancy across all trimesters, associated with primiparity. This indicates pregnancy as a significant risk with reference to altered cardiac balance and use of HRV as a good tool to assess the same.