The effect of caffeine on retrobulbar hemodynamics
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Published on: January 25, 2016
Berna Ozkan1, Nurşen Yüksel, Yonca Anik
1Department of Ophthalmology, Faculty of Medicine, Kocaeli University, Kocaeli, Turkey. aydoganberna@yahoo.com
Insights
Caffeine consumption did not significantly alter intraocular pressure or retrobulbar blood flow velocity in healthy individuals. However, caffeine intake did increase vascular resistance in retrobulbar arteries, suggesting potential hemodynamic changes.
Area of Science:
- Ophthalmology
- Cardiovascular Physiology
- Pharmacology
Background:
- Caffeine is a widely consumed stimulant with potential physiological effects.
- Investigating caffeine's impact on ocular hemodynamics is crucial for understanding its systemic and local effects.
Purpose of the Study:
- To determine the acute effects of caffeine on intraocular pressure (IOP) and retrobulbar blood flow velocity.
- To assess caffeine's influence on ocular vascular resistance in healthy volunteers.
Main Methods:
- A randomized, double-masked, placebo-controlled study involving 300-mg oral caffeine administration.
- Color Doppler ultrasonography was used to measure retrobulbar arterial hemodynamics.
- Intraocular pressure, blood pressure, and pulse rate were monitored before and after caffeine intake.
Main Results:
- No significant changes in mean blood pressure or intraocular pressure were observed post-caffeine.
- Peak systolic and end-diastolic velocities in retrobulbar arteries remained unchanged.
- A significant increase in the resistive index of ophthalmic, central retinal, and ciliary arteries was noted.
Conclusions:
- Caffeine consumption appears to alter the vascular resistance of retrobulbar vessels.
- Further research is warranted to explore caffeine's hemodynamic effects in glaucoma patients.
Background:
To investigate the acute effect of caffeine on intraocular pressure and retrobulbar blood flow velocity.
Methods:
In this randomized, double-masked, placebo-controlled, prospective study, we examined the effects of single 300-mg oral administration of caffeine on retrobulbar arteries' hemodynamics by using color Doppler ultrasonography imaging in healthy human volunteers. The subjects were divided into two groups; group 1 received a 300-mg caffeine tablet and group 2 received placebo. Measurements were obtained in two eyes at baseline, and 1 hr after acute ingestion of caffeine. Blood pressure, pulse rate, and intraocular pressure were monitored.
Results:
When compared with placebo, no significant change in mean blood pressure or intraocular pressure was observed after administration of caffeine. No significant differences were detected in the peak systolic and end diastolic velocities of retrobulbar arteries, compared with baseline values. Resistive index of ophthalmic, central retinal, and short posterior nasal ciliary artery were significantly increased after oral application of caffeine in group 1 (p<0.05).
Conclusion:
The vascular resistance of the retrobulbar vessels appears to be altered by caffeine consumption. Further studies are needed to investigate the effects of caffeine on hemodynamics in patients with glaucoma.
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