|  | Early first trimester | Late first trimester | ||
---|---|---|---|---|---|
 |  | 5 weeks | 6 weeks | 7 weeks | 8–12 weeks |
Arteries | Total Peripheral Resistance (TPR) | ↓ |  |  |  |
Pulse Wave Velocity (PWV) |  | ↓ |  |  | |
Aorta Compliance |  |  | ↑ |  | |
Blood Pressure |  | ↓ |  |  | |
Blood Velocity |  |  |  | ↑ | |
Heart | Heart Rate (HR) | ↑ |  |  |  |
Stroke Volume (SV) | ↑ |  |  |  | |
Cardiac Output (CO) | ↑ |  |  |  | |
Cardiac Filling Pressure |  | ↑ |  |  | |
Inotropy |  |  |  | ↑ | |
Heart Surface Area |  |  |  | ↑ | |
Atrial-Ventricular Dimensions |  |  |  | ↑ | |
Ventricular Wall |  |  |  | ↑ | |
Veins | Venous Return |  | ↑ |  |  |
Distensibility |  |  | ↑ |  | |
Capacitance |  |  | ↑ |  | |
Hematology | Plasma Volume | ↑ |  |  |  |
Plasma Osmolality | ↓ |  |  |  | |
Relaxin |  | ↑ |  |  | |
Kidney | Glomerular Filtration Rate (GFR) |  | ↑ |  |  |
Renal Plasma Flow (RPF) |  | ↑ |  |  | |
Renal Vascular Dilatation |  | ↓ |  |  | |
Filtration Fraction |  | ↓ |  |  | |
Renin Angiotensin Aldosterone System (RAAS) |  | ↑ |  |  |