Ophthalmic artery blood flow in very-low-birth-weight preterm infants

Area of Science:

• Neonatal physiology
• Vascular ultrasound
• Ophthalmic artery hemodynamics

Background:

• Premature infants, particularly those with very low birth weight, are at risk for various complications.
• Understanding normal vascular development and blood flow is crucial for monitoring infant health.
• The ophthalmic artery is a key vessel supplying the eye, and its flow patterns can indicate cerebrovascular status.

Purpose of the Study:

• To establish normal blood flow velocity and Doppler indices in the ophthalmic arteries of very-low-birth-weight infants.
• To characterize these hemodynamic parameters from birth through hospital discharge.
• To provide reference values for infants born at <32 weeks gestational age and birth weights between 500-1500g.

Main Methods:

• A longitudinal prospective study utilizing Doppler ultrasound.
• Measurements were taken in both eyes at 24 hours, 7 days, 28 days, and hospital discharge.
• Exclusion criteria included retinopathy of prematurity (ROP) stage 2+, severe peri-intraventricular hemorrhage (PIVH) grades 3-4, and death.

Main Results:

• 46 very-low-birth-weight infants (92 eyes) were studied.
• Systolic and diastolic velocities in the ophthalmic arteries significantly increased from birth to hospital discharge (P=0.001 and P=0.02, respectively).
• Pulsatility index and resistance index showed no significant changes throughout the neonatal period.

Conclusions:

• A typical pattern of ophthalmic artery blood flow velocity and Doppler indices exists in very-low-birth-weight infants during the neonatal period.
• These findings establish normative data for this vulnerable population.
• Understanding these patterns aids in the assessment of ophthalmic artery hemodynamics in preterm infants.