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Fetal middle cerebral arterial peak systolic velocity

Dr Owen Kang ◉ and Radswiki et al.

The fetal middle cerebral arterial (MCA) peak systolic velocity (PSV) is an important parameter in fetal MCA Doppler assessment.

Sonographic assessment

The fetal MCA should be sampled~2 mm from the origin of the fetal internal carotid artery and the angle of the ultrasound beam and the direction of blood flow should be 0°. Usually the highest value is taken.

Interpretation

reliable between 18-35 weeks
increased PSV can indicate moderate-to-severe anemia in non-hydrops fetuses ⁴

See also

automatic online fetal MCA PSV calculator as of 2011 from www.perinatology.com

References

Ultrasound - obstetric

Article information

rID: 15508

System: Obstetrics

Section: Approach

Tag: stub, cases

Synonyms or Alternate Spellings:

Fetal MCA peak systolic velocity (PSV)
Fetal middle cerebral arterial (MCA) peak systolic velocity (PSV)
Fetal MCA PSV

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Cases and figures

3rd trimester normal MCA Doppler 3rd trimester normal MCA Doppler

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