Hemodynamic patterns in preterm and term labor: working hypothesis.

This report describes hemodynamic patterns recorded from patients who had spontaneous abortion, preterm, and term labor. A working hypothesis theorizes that specific patterns observed in these situations can be identified and correlated with those present in the preovulatory and postovulatory phases of the menstrual cycle and thereby provide a clue to endocrine imbalances that may occur during pregnancy and play a role in the pathophysiology of these complications.