Table 1: Summary of Physiologic Changes During Pregnancy.

Cardiovascular	Increased uterine mass causes compression of IVC leads to venous stasis and increased risk for deep venous thrombosis, Decreased amplitude of T-waves on electrocardiogram, Extra heart sounds / systolic S3 murmur.
Hematologic	Hypercoagulable state leads to increased risk for thrombosis/embolism, Leukocytosis, Physiologic anemia due to increased circulating volume, Generalized immunosuppression.
Respiratory	Increased mucosal fragility / increased risk of airway edema, epistaxis with manipulation of nasal airway, Decreased PaO2 while supine leads to increased risk of hypoxia, decreased functional residual capacity,progesterone-induced hyperventilation.
Gastrointestinal	Loss of lower esophageal sphincter tone leads to increased risk of reflux disease, Decreased gastric motility, Increased intragastric pressure.
Genitourinary	Loss of intravascular protein causes decreased oncotic pressure leads to peripheral edema, Increased glomerular filtration rate Urinary stasis leads to increased risk of urinary tract infections.
Endocrine	Increase in Estrogen ,progesterone, thyroxine, steroids, insulin levels and increase in the circulating 1,25, dihydroxy-cholecaliciferol.