Fetal middle cerebral arterial peak systolic velocity

Dr Henry Knipe and Radswiki et al.

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

Measurement

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 peak systolic velocity (PSV) 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 from www.perinatology.com (c. 2011)
Ultrasound - obstetric

Article information

rID: 15508
System: Obstetrics
Section: Approach
Tag: cases, 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

  • Case 1: third trimester
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