Table 1: Pregnancy-induced physiologic changes during near term.

System [ref.]ParameterNon
pregnant
Pregnant

Cardiovascular [18, 19]Cardiac output (L/min)4.07.0
Heart rate (beats per min)7090
Stroke volume (mL)6585
Plasma volume (L)2.63.5
Colloid osmotic pressure (mmHg)22.018.2
Total peripheral arterial resistance (dyne s cm−5)15301210

Respiratory [20]Total lung capacity (mL)42254080
Residual volume (mL)965770
Tidal volume (mL)485680
Minute O2 uptake201265

Liver [21]Portal vein blood flow (L/min)1.251.92
Hepatic artery blood flow (L/min)0.571.06*

Renal [22]Glomerular filtration rate (mL/min)97144
Creatinine (mg/dL)0.70.5

*Difference was not statistically significant.