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| CO | Cardiovascular resistance |
| CVRi | Cardiovascular resistance index |
| Dx | Diastolic flow velocity index (Dx) |
| Mx | Mean flow velocity index (Mx) |
| PI | Pulsatility index (Gosling's index, PI) |
| PRx | Pressure reactivity index (PRx) |
| PWA | Pulse wave amplitude (PWA/AMP) |
| RI | Resistance index (RI) |
| Sx | Systolic flow velocity index (Sx) |