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Pulsatile ocular blood flow during pregnancy.
M Centofanti1, R Migliardi, S Bonini
1Ophthalmology Clinic, Tor Vergata University, Roma, Fondazione G.B. Bietti per l'Oftalmologia Onlus, Italy.
European Journal of Ophthalmology
|September 11, 2002
Summary
Pulsatile ocular blood flow (POBF) significantly increases during pregnancy, with higher levels observed in the second trimester compared to the first. These changes may be influenced by hormonal shifts during gestation.
Area of Science:
- Ophthalmology
- Physiology
- Reproductive Medicine
Background:
- Pregnancy involves significant physiological changes, including hormonal shifts that can affect various bodily systems.
- Ocular blood flow is crucial for maintaining eye health, and its regulation may be altered during gestation.
Purpose of the Study:
- To investigate changes in pulsatile ocular blood flow (POBF) throughout pregnancy.
- To compare POBF in pregnant women with non-pregnant controls.
Main Methods:
- Twenty-seven healthy pregnant women were enrolled, with some followed from the first to the second trimester.
- POBF, intraocular pressure (IOP), blood pressure (BP), and heart rate (HR) were measured using a pneumotonometer.
- Statistical analysis included unpaired and paired Student t-tests.
Main Results:
- POBF significantly increased from the first to the second trimester of pregnancy (p < 0.0008).
- POBF in pregnant women was substantially higher than in non-pregnant controls (p = 0.00008).
- No significant differences were observed in IOP, BP, or HR between groups or across trimesters.
Conclusions:
- Pulsatile ocular blood flow (POBF) demonstrates a significant increase throughout gestation.
- Elevated estrogen levels during pregnancy may contribute to increased POBF via endothelial-dependent vasodilation.
- These findings suggest a dynamic adaptation of ocular hemodynamics during pregnancy.