Physiological Changes in Pregnancy

📋 Course Outline

1. Blood Volume Changes
2. Hematological Adaptations
3. Renal Function in Pregnancy
4. Respiratory System Changes
5. Uterine and Breast Changes
6. Fetal Skull Anatomy
7. Maternal Pelvis Types
8. Placental and Blood Flow Anomalies
9. Pregnancy Complications
10. Labor and Delivery Mechanics

📖 1. Blood Volume Changes

🔑 Key Concepts & Definitions

• Hemodilution: An increase in plasma volume that dilutes blood components, leading to decreased hemoglobin concentration and hematocrit during pregnancy.
• Blood Volume Increase: Total blood volume rises by approximately 30-50% in pregnancy, primarily due to increased plasma and red blood cell mass.
• Physiological Anemia: A normal decrease in hemoglobin concentration during pregnancy caused by hemodilution, not true anemia.
• Hemodynamic Changes: Increased cardiac output and blood volume, with decreased systemic vascular resistance, facilitating better placental perfusion.
• Gestational Thrombocytopenia: A mild decrease in platelet count during pregnancy, common and usually asymptomatic.
• Water Retention: Increased extracellular water retention influenced by estrogen and the renin-angiotensin system, contributing to plasma volume expansion.

📝 Essential Points