Maternal cerebral circulation in normal and abnormal pregnancies

Area of Science:

• Obstetrics and Gynecology
• Neurology
• Vascular Medicine

Background:

• Abnormal pregnancies frequently involve impaired maternal cerebral circulation due to vasospasm and edema.
• The exact cause of vasospasm in pregnancy remains debated.
• Evaluating maternal cerebral blood flow velocity (CBFV) is crucial for understanding pregnancy complications.

Purpose of the Study:

• To assess maternal CBFV in normal versus abnormal pregnancies.
• To correlate CBFV changes with the severity of symptoms in abnormal pregnancies.
• To investigate the predictive value of CBFV in identifying potential complications.

Main Methods:

• Transmitted Doppler (TCD) and Color Doppler imaging were used to analyze CBFV in 40 pre-eclamptic gravidas.
• Measurements were taken weekly from the 32nd week of gestation and continued for 2 months postpartum.
• Carotid arteries and MCA diameters were assessed to evaluate vascular changes.

Main Results:

• 70% of abnormal pregnancies exhibited impaired TCD findings, predominantly increased CBFV.
• A significant correlation was found between the degree of toxemia (Goecke's index) and abnormal CBFV.
• Increased CBFV preceded the development of vasospasm in some cases and neurological symptoms.

Conclusions:

• Elevated maternal CBFV is a common finding in abnormal pregnancies, increasing progressively in late gestation.
• While vasospasm is implicated, its definitive presence is still under investigation.
• CBFV changes detected by TCD show promise as early indicators, preceding neurological manifestations in abnormal pregnancies.