Dronabinol and retinal hemodynamics in humans

Area of Science:

• Ophthalmology
• Pharmacology
• Physiology

Background:

• Cannabinoids are known to reduce intraocular pressure (IOP).
• The impact of cannabinoids on retinal hemodynamics is less understood.
• Assessing retinal blood flow is crucial for understanding ocular health.

Purpose of the Study:

• To investigate the effects of oral cannabinoids on retinal hemodynamics.
• To assess changes in retinal arteriovenous passage time using video fluorescein angiography.
• To evaluate the impact of dronabinol on intraocular pressure in healthy subjects.

Main Methods:

• An interventional study involving eight healthy subjects.
• Oral administration of dronabinol (7.5 mg).
• Measurement of intraocular pressure and retinal hemodynamics via fluorescein angiography at baseline and 2 hours post-administration.

Main Results:

• Dronabinol significantly reduced intraocular pressure (IOP) from 13.2 to 11.8 mm Hg (P=.038).
• Retinal arteriovenous passage time decreased significantly from 1.77 to 1.57 seconds (P=.028).
• No significant changes in systemic blood pressure or heart rate were observed.

Conclusions:

• Oral cannabinoids, specifically dronabinol, enhance retinal hemodynamics.
• The observed increase in retinal hemodynamics may offer therapeutic potential for ocular circulatory disorders.
• Cannabinoids may be beneficial in managing conditions like glaucoma due to their IOP-lowering and hemodynamic effects.