Maternal Physiology in Pregnancy

Overview

Pregnancy induces profound, systemic physiological adaptations designed explicitly to support fetal growth and prepare for the demands of labor and delivery. These changes are overwhelmingly driven by drastically elevated systemic progesterone and estrogen.

Cardiovascular Changes

• Plasma Volume: Expands spectacularly by up to 50%, peaking around 32 weeks.
• Cardiac Output: Increases heavily by 30-50%, primarily through an initially profound increase in stroke volume and a later increase in heart rate.
• Blood Pressure: Systemic vascular resistance actually drops deeply due to progesterone, causing a slight completely physiological drop in BP during the 2nd trimester.

Hematological Changes

High Yield Facts

• GFR profoundly increases by strictly 50%, drastically lowering normal serum creatinine ranges.
• Pregnancy correctly constitutes a profoundly explicit hypercoagulable state exactly precisely simply closely smoothly heavily successfully smoothly to cleanly successfully significantly prevent severe perfectly fatal bleeding genuinely entirely tightly totally smoothly during delivery.