Pulmonary artery dilatation during normal pregnancy.

Area of Science:

• Cardiovascular physiology
• Obstetric medicine
• Pulmonary circulation

Background:

• Pregnancy induces significant cardiovascular alterations.
• Pulmonary artery behavior during gestation remains understudied.
• Understanding these changes is crucial for maternal and fetal health.

Purpose of the Study:

• To investigate pulmonary artery diameter (PAD) changes during pregnancy.
• To correlate PAD variations with left ventricular (LV) load and remodeling.
• To assess the relationship between PAD and systemic vascular resistance (SVR).

Main Methods:

• Prospective cohort study of 69 healthy pregnant women.
• Echocardiography and uterine artery ultrasonography performed at two prenatal visits (V1, V2) and one postpartum visit.
• Analysis of PAD, LV parameters, and SVR.

Main Results:

• Pulmonary artery diameter increased from 20.0 mm (V1) to 22.7 mm (V2) (p < 0.001), returning to 19.5 mm postpartum (p < 0.001 vs. V2).
• PAD positively correlated with LV end-diastolic diameter, LV end-systolic diameter, LV end-diastolic volume, LV mass, left atrial area, LV cardiac output, and aortic diameter.
• PAD showed a negative correlation with SVR (r = -0.307; p = 0.025) and pulsatility index (r = -0.318; p = 0.012).

Conclusions:

• Healthy pregnant women exhibit pulmonary artery dilatation without other echocardiographic abnormalities.
• These PAD changes are linked to increased volume load and reduced vascular resistance.
• Pulmonary artery diameter typically normalizes postpartum.