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Related Concept Videos

Glaucoma: Overview01:25

Glaucoma: Overview

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Glaucoma is an eye condition characterized by increased intraocular pressure that damages the retina and optic nerve, leading to irreversible blindness if left untreated. The human eye has various components, including the cornea, iris, pupil, lens, and optic nerve. Aqueous humor is secreted by the epithelium of the ciliary body in the posterior chamber and flows through the trabecular meshwork and canal of Schlemm, maintaining normal intraocular pressure. The trabecular meshwork and the canal...
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Open Angle Glaucoma: Treatment01:27

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In open-angle glaucoma, the iridocorneal angle remains open, but the trabecular meshwork becomes stiff, slowing down the outflow of aqueous humor. This causes a buildup of aqueous humor in the anterior chamber, leading to a sudden increase in intraocular pressure. The treatment for open-angle glaucoma focuses on reducing the elevated intraocular pressure by either decreasing the secretion of aqueous humor or increasing its outflow.
Drugs such as carbonic anhydrase inhibitors, α2- and...
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Angle Closure Glaucoma: Treatment01:28

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Angle-closure glaucoma, or closed-angle glaucoma, is an eye condition where the iris bulges out and blocks the iridocorneal angle, resulting in a buildup of aqueous humor and increased intraocular pressure. Immediate medical attention is necessary due to the sudden onset of symptoms. The treatment for angle-closure glaucoma includes short-term and long-term approaches. Short-term treatment involves using eye drops like pilocarpine to lower intraocular pressure by increasing aqueous humor...
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Heart Rate Variability Frequency-Domain Analysis Across Glaucoma Subtypes.

Misaki Ukisu1, Yuto Yoshida1, Hinako Takei1

  • 1Department of Ophthalmology, Shimane University Faculty of Medicine, Izumo 693-8501, Japan.

Biomedicines
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Summary

Heart rate variability (HRV) in glaucoma patients shows age-related changes. Exfoliation glaucoma (EG) patients had lower HRV parameters than primary open-angle glaucoma (PG) patients, but no direct link to glaucoma or pseudoexfoliation material was found.

Keywords:
autonomic nervous systemexfoliation glaucomafrequency-domain heart rate variabilityprimary open-angle glaucoma

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Area of Science:

  • Ophthalmology
  • Cardiology
  • Autonomic Neuroscience

Background:

  • Heart rate variability (HRV) reflects autonomic nervous system function.
  • Limited large-scale studies exist on frequency-domain HRV and glaucoma subtypes.
  • Investigating HRV in primary open-angle glaucoma (PG) and exfoliation glaucoma (EG) is crucial.

Purpose of the Study:

  • To examine the relationship between frequency-domain HRV parameters and glaucoma subtypes (PG and EG).
  • To utilize a large sample size for robust statistical analysis.
  • To identify factors associated with HRV alterations in glaucoma patients.

Main Methods:

  • Recruited participants with PG, EG, and controls (n=809).
  • Measured frequency-domain HRV parameters (TP, VLF, LF, HF, LF/HF) using a sphygmograph.
  • Employed unpaired t-tests, Fisher's exact tests, Tukey's HSD, and multivariate analyses.

Main Results:

  • Exfoliation glaucoma (EG) group showed significantly lower HRV parameters than the primary open-angle glaucoma (PG) group.
  • EG group had significantly lower LnLF values than controls (p=0.012).
  • No significant associations found between HRV and glaucoma presence or pseudoexfoliation material; older age correlated with lower HRV.

Conclusions:

  • Age-related alterations in frequency-domain HRV parameters are evident in elderly glaucoma patients.
  • HRV may serve as an indicator of aging effects on the autonomic nervous system in glaucoma.
  • Further research is needed to elucidate the specific mechanisms linking HRV and glaucoma subtypes.