Transcranial Doppler Ultrasound: A Review of the Physical Principles and Major Applications in Critical Care

Table 2

Factors influencing MFV [18, 20].

Factor	Change in MFV
Age	Increases up to 6–10 years of age then decreases; (see [26] for a full range of values)
Sex	Higher MFV in women than men
Pregnancy	Decreased in the 3rd trimester
PCO2	Increases with increasing PCO2
Mean arterial Pressure (MAP)	Increases with increasing MAP; (CBF autoregulates between CPP 50–150 mmHg)
Haematocrit	Increases with decreasing haemotocrit